KEY PRODUCTION CO INC
S-4, 2000-09-12
CRUDE PETROLEUM & NATURAL GAS
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      AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON SEPTEMBER 12, 2000
                                                     REGISTRATION NO. 333-_____
--------------------------------------------------------------------------------
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                         ------------------------------
                                    FORM S-4
                             REGISTRATION STATEMENT
                                      UNDER
                           THE SECURITIES ACT OF 1933
                         ------------------------------
                          Key Production Company, Inc.
             (Exact name of registrant as specified in its charter)

           DELAWARE                        1311                  84-1089744
 (State or other jurisdiction        (Primary Standard       (I.R.S. Employer
              of                        Industrial        Identification Number)
incorporation or organization)  Classification Code
                                        Number)

                       707 Seventeenth Street, Suite 3300
                             Denver, Colorado 80202
                                 (303) 295-3995
                   (Address, including zip code, and telephone
                  number, including area code, of registrant's
                          principal executive offices)

                               Monroe W. Robertson
                      President and Chief Operating Officer
                          Key Production Company, Inc.
                       707 Seventeenth Street, Suite 3300
                             Denver, Colorado 80202
                                 (303) 295-3995
 (Name, address, including zip code, and telephone number, including area code,
                              of agent for service)
                         ------------------------------
                                   COPIES TO:
Nick Nimmo                                  James F. Wood
Holme Roberts & Owen LLP                    Sherman & Howard L.L.C.
1700 Lincoln Street, Suite 4100             633 17th Street, Suite 3000
Denver, Colorado 80203                      Denver, Colorado 80202
(303) 866-0216                              (303) 297-2900

                         ------------------------------
APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE TO THE PUBLIC: AS SOON AS
PRACTICABLE AFTER THIS REGISTRATION STATEMENT BECOMES EFFECTIVE AND AT THE
EFFECTIVE TIME OF THE MERGER AS DESCRIBED IN THE AGREEMENT AND PLAN OF MERGER
DATED AS OF AUGUST 28, 2000.
                         ------------------------------

    If the securities being registered on this Form are being offered in
connection with the formation of a holding company and there is compliance with
General Instruction G, check the following box: / /

    If this Form is filed to register additional securities for an offering
pursuant to Rule 462(b) under the Securities Act of 1933, check the following
box and list the


<PAGE>



Securities Act registration statement number of the earlier effective
registration statement for the same offering. / /

If this Form is a post-effective amendment filed pursuant to Rule 462(d) under
the Securities Act of 1933, check the following box and list the Securities Act
registration statement number of the earlier effective registration statement
for the same offering. / /

                         -------------------------------
                         Calculation of registration fee
<TABLE>
<CAPTION>

                                            Proposed maximum
Title of each class                         offering price    Proposed maximum   Amount of
of securities to be       Amount to         per share of      aggregate          registration
registered                be registered(1)  common stock      offering price(2)  fee
-------------------       ----------------  ------------      -----------------  ------------
<S>                        <C>              <C>               <C>                  <C>
Common stock, par value
   $0.25 per share(3)      1,546,000        $18.30           $28,297,308          $7,471
</TABLE>

    (1)  Consists of (i) up to 1,333,000 shares of common stock, par value $0.25
         per share, of Key Production issuable upon the conversion, pursuant to
         the merger described herein, of 3,753,868 shares of common stock of
         Columbus Energy Corp. outstanding on August 31, 2000, and (ii) up to
         213,000 shares of Key Production common stock which may be issued
         pursuant to outstanding Columbus options between August 31, 2000 and
         consummation of the merger.

    (2)  Estimated solely for the purpose of calculating the registration fee
         pursuant to Rule 457(f) under the Securities Act of 1933, as amended,
         based on the product of $6.50 (the average of the high and low prices
         of Columbus common stock on September 8, 2000, on the American Stock
         Exchange) times 4,353,432 (the number of shares of Columbus common
         stock outstanding and shares reserved for issuance upon the exercise of
         outstanding options to purchase Columbus common stock on August 31,
         2000.)

                         ------------------------------

    THE REGISTRANT HEREBY AMENDS THIS REGISTRATION STATEMENT ON SUCH DATE OR
DATES AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANT SHALL
FILE A FURTHER AMENDMENT WHICH SPECIFICALLY STATES THAT THIS REGISTRATION
STATEMENT SHALL THEREAFTER BECOME EFFECTIVE IN ACCORDANCE WITH SECTION 8(a) OF
THE SECURITIES ACT OF 1933 OR UNTIL THE REGISTRATION STATEMENT SHALL BECOME
EFFECTIVE ON SUCH DATE AS THE COMMISSION, ACTING PURSUANT TO SECTION 8(a), MAY
DETERMINE.



<PAGE>



--------------------------------------------------------------------------------
Subject to completion, dated ________, 2000. The information in this prospectus
is not complete and may be changed. We may not sell these securities until the
registration statement filed with the Securities and Exchange Commission is
effective. This prospectus is not an offer to sell these securities and it is
not soliciting an offer to buy these securities in any state where the offer or
sale is not permitted.
--------------------------------------------------------------------------------
                                     [LOGO]
                                 Columbus Energy
                                      Corp.
                                                                __________, 2000

                   Proposed Merger-Your Vote Is Very Important

Dear Shareholder:

         On August 28, 2000, Key Production Company, Inc. and Columbus Energy
Corp. agreed to merge. Upon completion of the merger, Columbus shareholders will
receive 0.355 shares of Key's common stock for each share of Columbus common
stock they own. Key stockholders will continue to own their existing shares of
Key common stock after the merger.

         The merger will be tax-free to Columbus shareholders for U.S. federal
income tax purposes except for taxes due on cash received by Columbus
shareholders for fractional shares.

         The merger requires the approval of Columbus' shareholders. Columbus
has scheduled a special meeting of its shareholders on October __, 2000 to vote
on the merger. Regardless of the number of shares you own or whether you plan to
attend the meeting, it is important that your shares be represented and voted.
Voting instructions are inside.

         This document provides you with detailed information about the proposed
merger. We encourage you to read this entire document carefully.

Columbus Energy Corp.

/s/ Harry A. Trueblood, Jr.
Chairman of the Board, President and
Chief Executive Officer

--------------------------------------------------------------------------------
--------------------------------------------------------------------------------
For a discussion of certain risk factors that you should consider in evaluating
the merger, see "Risk Factors" beginning on page __.

         This document incorporates important business and financial information
about Key and Columbus that is not included or delivered with this document. The
information incorporated by reference is available without charge to
stockholders upon written or oral request to:


<PAGE>




Columbus Energy Corp.                   Key Production Company, Inc.
1660 Lincoln St.                        707 Seventeenth Street
Suite 2400                              Suite 3300
Denver, Colorado  80264                 Denver, Colorado  80202-3404
Attention: Michael M. Logan             Attention: Paul Korus
Corporate Secretary                     Tel: (303) 295-3995
Tel: (303) 861-5252

         If you would like to request documents from us, please do so by
___________, 2000, to receive them before the meetings.

--------------------------------------------------------------------------------
         Neither the Securities and Exchange Commission nor any state securities
commission has approved or disapproved of these securities or passed upon the
adequacy or accuracy of this proxy statement/prospectus. Any representation to
the contrary is a criminal offense.
--------------------------------------------------------------------------------

         This proxy statement/prospectus is dated __________, 2000 and was first
mailed to Columbus shareholders on or about _________, 2000.


<PAGE>



                              Columbus Energy Corp.
                                1660 Lincoln St.
                                   Suite 2400
                                Denver, CO 80264
                            ------------------------
                    Notice of Special Meeting of Shareholders
                         To Be Held on ___________, 2000
                            ------------------------

To the Shareholders of
Columbus Energy Corp.:

    A special meeting of shareholders of Columbus Energy Corp. will be held on
October ____, 2000, at 9:00 a.m., local time, at the Wells Fargo Bank Building
Forum Room, Main Floor, 1740 Broadway, Denver Colorado, for the following
purposes:

        1.  To consider and vote upon a proposal to approve the merger agreement
    between Key Production Company, Inc. and Columbus and the merger; and

        2.  To transact other business as may properly be presented at the
    special meeting or any adjournments of the meeting.

    Columbus will not complete the merger unless its shareholders approve the
merger agreement and the merger.

    Only shareholders of record at the close of business on _________, 2000, are
entitled to notice of and to vote at the meeting and any adjournments of the
meeting. A list of shareholders entitled to vote at the meeting will be
available for inspection during normal business hours for the ten days before
the meeting at the offices of Columbus and at the time and place of the meeting.

                                    Important

    Please complete, date, sign and promptly return your proxy card so that your
shares may be voted in accordance with your wishes and so that the presence of a
quorum may be assured. Giving a proxy does not affect your right to vote in
person if you attend the meeting. You may revoke your proxy at any time before
it is exercised at the meeting.

By Order of the Board of Directors,

/s/ Michael M. Logan
Corporate Secretary

Denver, Colorado
________, 2000

                             Your vote is important!
                          Please read the accompanying
                           proxy statement/prospectus



                                                              3

<PAGE>



                                 Proxy Statement
                     For Special Meeting of Shareholders of
                              Columbus Energy Corp.

                                  Prospectus of
                          Key Production Company, Inc.
                     Up to 1,545,469 Shares of Common Stock

         Key Production Company, Inc. and Columbus Energy Corp. have signed a
merger agreement. As a result of the proposed merger, Columbus will become a
wholly owned subsidiary of Key.

         We are providing this proxy statement/prospectus to you in connection
with the Columbus board of directors' solicitation of proxies for use at a
special meeting of the shareholders of Columbus.

         This proxy statement/prospectus constitutes a prospectus of Key with
respect to the Key common stock to be issued in the merger in exchange for
outstanding shares of Columbus common stock.

         This proxy statement/prospectus provides you with detailed information
about the merger agreement and the proposed merger to be voted on at the special
meeting. Key provided the information concerning Key. Columbus provided the
information concerning Columbus. Please see "Where You Can Find More
Information" starting on page __ for additional information about Key and
Columbus.






<PAGE>




                                Table of Contents

                                                            Page

Questions and Answers.......................................
Summary.....................................................
Risk Factors................................................
Key After the Merger........................................
Comparative Per Share Data..................................
Comparative Market Price Data...............................
Unaudited Pro Forma Combined Financial Information..........
The Columbus Shareholder Meeting and Proxy Solicitation.....
The Merger..................................................
The Merger Agreement........................................
Directors and Executive Officers of the Combined Company....
Interests of Certain Executive Officers and Directors in
  the Merger................................................
Material United States Federal Income Tax Considerations....
Comparison of Shareholder Rights........................
Legal Matters...............................................
Experts.....................................................
Future Shareholder Proposals................................
Where You Can Find More Information.........................
Cautionary Statement Concerning Forward-Looking
  Statements................................................
Commonly Used Oil and Gas Terms.............................
Annex A-- Agreement and Plan of Merger......................A-1
(All references in Annex A to Arthur
Andersen LLP should be read as Arthur
Andersen Global Energy Corporate
Finance Group (AA Corporate Finance)
Annex B-- Arthur Andersen Global Energy Corporate
          Finance Group Fairness Opinion to the
          Board of Directors of Columbus....................B-1
Annex C--Columbus Annual Report on Form 10-K for Year
          ended November 30, 1999...........................C-1
Annex D--Columbus Quarterly Report on Form 10-Q for
          Quarter ended May 31, 2000........................D-1




                                                              2

<PAGE>



                                                    Questions And Answers

Q.   What is being proposed?

A.   Key and Columbus are proposing
     to merge the two companies.
     Columbus will become a wholly owned
     subsidiary of Key. Key will remain
     the publicly traded company.

Q.   What is the combined company?

A.   In this proxy statement/prospectus, we
     sometimes refer to Key after the merger
     with Columbus as "the combined
     company." References to "we," "us" and
     "our" are to the combined company.
     The term "Key" generally means
     Key Production Company, Inc., a
     Delaware corporation, its consolidated
     subsidiaries and its predecessor
     entities. The term "Columbus"
     generally means Columbus Energy
     Corp., a Colorado corporation,
     its consolidated subsidiaries and its
     predecessor entities.

Q.   Why are the companies merging?

A.   Key and Columbus believe that the merger
     will enable the combined company,
     with its larger asset base and expanded
     cash flow, to more effectively compete
     for new growth opportunities and to
     achieve certain other objectives, including:

     -  a more diversified asset base
     -  increased financial strength and greater
             borrowing capacity
     -  an estimated $2 million of annual cost
          savings

     You should review pages __ through __
     for a more complete discussion of the
     reasons for the merger.

Q.   What will shareholders receive as a
     result of the merger?

A.   Columbus shareholders will
     receive 0.355 shares of Key common
     stock for each share of Columbus
     common stock that they own. Key


                                                          3

<PAGE>



     stockholders will continue to own the same
     number of shares of Key common stock that
     they owned before the merger.

Q.  Is the merger taxable?

A.   Key and Columbus expect the merger to be
     tax free.  We have structured the
     merger so that legal counsel to Columbus
     will be able to deliver an opinion that
     Columbus shareholders will not
     recognize any gain or loss for U.S.
     Federal income tax purposes, except
     for taxes payable by Columbus shareholders
     as a result of receiving cash instead of
     fractional shares.

     You should review pages __ through __ for
     a more complete discussion of the
     tax consequences of the merger.

Q.   What does the Columbus board of directors
     recommend?

A.   The Columbus board of directors believes
     that the merger agreement and the
     merger are in the best interests of
     Columbus and its shareholders and
     recommends that the Columbus
     shareholders vote for approval of the
     merger agreement and the merger.


Q.   What vote is required to approve the merger?

A.   The affirmative vote of the holders of a
     majority of the outstanding shares of
     Columbus common stock is required for
     approval of the merger agreement at the
     shareholders meeting.

Q.   How Do I Vote?

A.   After carefully considering the enclosed
     information, please mark, sign,
     date and return your proxy card or
     voting instruction card in the enclosed
     envelope as soon as possible.

     Your shares will then be voted at the special
     meeting in accordance with your instructions.

Q:       Can I change my vote?

A:       Yes.  You may change your vote by giving


                                                          4

<PAGE>



      written notice of your revocation
      to Columbus' secretary, delivering a
      later- dated, signed proxy card to
      Columbus' secretary at or before the
      Columbus shareholder meeting, or
      attending the meeting and voting in
      person.

Q.   When and where is the special meeting?

A.   The special meeting is scheduled to take
     place on October ____, 2000, at 9:00 a.m.,
     local time, at the Wells Fargo Bank
     Building, Forum Room, Main Floor, 1740
     Broadway, Denver, Colorado.

Q.   If my shares are held in "street name"
     by my broker, will my broker vote my
     shares for me?

A.   No. You must instruct your broker how
     to vote your shares. Otherwise, your
     shares will not be voted.

Q.   What happens if I don't vote my shares?

A.   Abstentions and broker non-votes
     will have the same effect as
     voting against the merger.

Q.   Should I send in my Columbus
     certificates now?

A.   No. After the merger is approved, Columbus
     shareholders will receive written
     instructions on how to exchange their
     Columbus stock certificates for
     Key stock certificates. Key
     stockholders will not be required to
     exchange their stock certificates.

Q.   When do you expect the merger to be
     completed?

A.   We expect to complete the merger within
     one or two business days after
     receiving shareholder approval at the
     Columbus special meeting.

Q.   Who can help answer my questions or
     give me assistance in voting my shares?

A.   Columbus Energy Corp.
         1660 Lincoln St.
         Suite 2400
         Denver, Colorado  80264


                                                          5

<PAGE>



         Attention: Michael M. Logan,
        Corporate Secretary
         Tel: (303) 861-5252

Q.   Who can help answer additional
     questions about Key that I may have?

         Key Production Company, Inc.
         707 Seventeenth Street
         Suite 3300
         Denver, Colorado  80202
         Attention: Paul Korus
         Tel: (303) 295-3995



                                                          6

<PAGE>




                                     Summary

         This summary, together with the preceding Question and Answer section,
highlights selected information from this document. It may not contain all of
the information that is important to you. To better understand the merger and
related transactions and for a more detailed description of the legal terms, you
should carefully read this entire document and the documents to which we have
referred you. See "Where You Can Find More Information" on page __.

                                  The Companies

Key Production Company, Inc.
707 Seventeenth Street
Suite 3300
Denver, Colorado  80202
Tel: (303) 295-3995

         Key Production Company, Inc. is an independent energy company engaged
in the exploration, development, acquisition and production of oil and gas in
the continental United States. Key conducts exploration and development
activities primarily in the Anadarko Basin of Oklahoma, north Texas, the
Mississippi Salt Basin, south Louisiana and northern California. Key also has
meaningful production operations and exploration acreage in Wyoming and other
Rocky Mountain states. Key's common stock is traded on the New York Stock
Exchange under the symbol "KP."

Columbus Energy Corp.
1660 Lincoln St.
Suite 2400
Denver, Colorado  80264
Tel: (303) 861-5252

    Columbus engages in the production and sale of crude oil, condensate and
natural gas, as well as the acquisition and development of leaseholds and other
interests in oil and gas properties, and also acts as manager and operator of
oil and gas properties for itself and others. It also engages in the business of
compression, transmission and marketing of natural gas. It has operations in
Texas, North Dakota, Louisiana, Oklahoma and Montana. Columbus' common stock is
traded on the American Stock Exchange under the symbol "EGY."

                                   The Merger

What Columbus shareholders will receive in the merger (see page __)

         Columbus shareholders will receive 0.355 shares of Key common stock for
each share of Columbus common stock that they own. Columbus shareholders will
not receive fractional shares. Instead, they will receive cash equal to the
market value of any fractional shares. Current Columbus shareholders will own
approximately 10% of the common stock of the combined company.

            Directors and senior management of the combined company
                           following the merger (see
                                    page __)

         The board of directors and officers of the combined company will
consist of the current directors and officers of Key. The combined company may
determine to offer employment to Columbus employees.


                                                              7

<PAGE>





Columbus' Reasons for the Merger (see page ____).

         The Columbus board based its decision to approve the merger and
recommend its adoption by the Columbus shareholders based upon various factors
including:

   o    the favorable recommendation of senior management of Columbus;

   o    the prospects for Columbus and Key on a combined basis;

   o    the terms of the merger agreement;

   o    the Arthur Andersen Global Energy Corporate Finance Group (AA
        Corporate Finance) fairness opinion to the board of directors
        of Columbus, to the effect that, as of the date of the
        opinion, the exchange ratio pursuant to the merger agreement
        was fair from a financial point of view to the shareholders of
        Columbus;

   o    the potential for an increase in Key's common stock trading price;

   o    the potential for improved trading liquidity to Columbus' shareholders;

   o    the tax-free nature of the merger (except for cash received by Columbus'
        shareholders instead of fractional shares); and

   o    the likelihood that the merger will be completed.

Voting

Votes required (see page __)

         The affirmative vote of the holders of a majority of the outstanding
shares of Columbus common stock is required for approval of the merger agreement
at the Columbus meeting.

         Harry A. Trueblood, Jr., Columbus' President and Chief Executive
Officer, has agreed to vote approximately 18% of the outstanding Columbus common
stock for the merger. An additional approximately 9% of Columbus' outstanding
shares are held by a trust of which Mr. Trueblood is the trustee and
Columbus' other directors and executive officers, all of whom are expected to
vote their shares for approval of the merger.

Columbus' recommendations to its shareholders

         Columbus' board of directors has unanimously approved the merger and
believes that the merger agreement and the merger are in the best interests of
Columbus and its shareholders. Accordingly, it recommends that Columbus
shareholders vote FOR the approval of the merger agreement and the merger.

Fairness opinion of Columbus' financial advisor (see pages __ through __)

         In deciding to approve the merger, the board of directors of Columbus
considered the fairness opinion of AA Corporate Finance, its financial advisor,
to the effect that, as of the date of its opinion, the exchange ratio pursuant
to the merger agreement was fair from a financial point of view to the
shareholders of Columbus.
                                                              8

<PAGE>


    This opinion is attached as Annex B to this proxy statement/prospectus. We
encourage you to read this opinion carefully, as well as the description of the
analyses and assumptions on which the opinion was based found on pages __ and
__.

             Interests of officers and directors in the merger that
                           differ from your interests
                                 (see page __)

    Some of the officers and directors of Columbus have agreements, stock
options and other benefit plans that may provide them with interests in the
merger that are different from yours. The Columbus board was aware of these
interests and considered them in approving the merger.


                              The Merger Agreement

         The merger agreement is attached as Annex A to this document. We
encourage you to read the merger agreement because it is the legal document that
governs the merger.

Conditions to the merger (see pages __ through __)

         In order to complete the merger, a number of customary conditions must
be satisfied, including the following:

    - the approval by the Columbus shareholders;

    - the absence of any law or court order prohibiting the merger;

    - the approval for listing on the New York Stock Exchange of the Key
      shares to be issued in the merger;

    - there must not be a material adverse change in either party's business or
      financial condition;

    - the continued accuracy of each company's representations and warranties,
      and the compliance by each company with its covenants and agreements
      contained in the merger agreement; and

    - the receipt of a legal opinion from counsel for Columbus as to the
      tax-free qualification of the merger.

         The board of directors of either Key or Columbus may choose to complete
the merger even though a condition to that company's obligation has not been
satisfied if the Columbus shareholders have approved the merger and the law
allows the board to do so.

Termination of the merger agreement (see page __)

         Key and Columbus can jointly agree to terminate the merger agreement
without completing the merger, even after Columbus shareholder approval. In
addition, either company can terminate the merger agreement on its own without
completing the merger if any of the following occurs:

                                                              9

<PAGE>



    -  some material breaches of covenants or representations in the merger
       agreement by the other party;

    -  a court or other governmental authority permanently prohibits the merger;

    -  the merger is not completed by December 31, 2000, subject to extension to
       March 31, 2001 if regulatory approvals are not received;

    -  the Columbus shareholders fail to approve the merger agreement and the
       merger; or

    -  the board of directors of Columbus withdraws its recommendation that
       the Columbus shareholders approve the merger if there exists at such
       time a competing transaction or if the board recommends approval of a
       competing transaction.

       Columbus can terminate the merger agreement on its own if Columbus'
financial advisor is requested to deliver an updated fairness opinion to
Columbus' board that the exchange ratio pursuant to the merger agreement is fair
from a financial point of view to the Columbus shareholders, and fails to do so.

         Key can terminate the merger agreement on its own if any of the
following occurs:

    -    the Columbus board of directors withdraws or changes its recommendation
         of the merger or recommends to the Columbus shareholders a competing
         transaction;

    -    a tender offer for 20% or more of the outstanding shares of capital
         stock of Columbus is commenced and the Columbus board does not
         recommend against it; or

    -    any person or group acquires or has the right to acquire beneficial
         ownership of 20% or more of Columbus' stock.

Termination fees and expenses (see pages __ through __)

         If Key terminates the merger agreement upon any of the following
events, then Columbus must pay to Key a fee of $1,000,000:

    -    Columbus has willfully breached any representation or agreement and has
         initiated, solicited or encouraged a competing transaction that occurs
         or is agreed upon within 12 months after the date of termination;

    -    the Columbus shareholders do not approve the merger and at the time of
         the shareholder meeting a competing transaction has been proposed; or

    -    Columbus' board withdraws its recommendation of the Key merger and at
         the time of the termination a competing transaction has been proposed;
         or

    -    a tender offer for 20% or more of the outstanding shares of capital
         stock of Columbus is commenced and the Columbus board does not
         recommend against it; or

    -    any person or group acquires or has the right to acquire beneficial
         ownership of 20% or more of Columbus' stock; or
                                                              10

<PAGE>


    -    AA Corporate Finance is requested to deliver an updated fairness
         opinion to the board of directors of Columbus that the exchange ratio
         pursuant to the merger agreement is fair from a financial point of view
         to the shareholders of Columbus, and fails to deliver the updated
         fairness opinion and at the time of the termination a competing
         transaction has been proposed.

         If Key terminates the merger agreement upon either of the following
events, then Columbus must pay to Key its out-of-pocket expenses incurred in
connection with the merger:

    -    the Columbus shareholders do not approve the merger and at the time of
         the shareholder meeting no competing transaction has been proposed; or

    -    AA Corporate Finance is requested to deliver an updated fairness
         opinion to the board of directors of Columbus that the exchange ratio
         pursuant to the merger agreement is fair from a financial point of view
         to the shareholders of Columbus, and fails to do so and at the time of
         the shareholder meeting no competing transaction has been proposed.

         If Columbus terminates the merger agreement upon a willful breach of
any representation or agreement of Key, then Key must pay to Columbus a fee of
$1,000,000.

Termination fees and expenses could have the effect of deterring competing
bidders

         The termination fees and expenses were intended to increase the
likelihood that Key and Columbus will complete the merger. The termination fees
and expenses have the effect of making an acquisition of Columbus by a third
party more costly. Accordingly, the termination fees and expenses may have the
effect of discouraging a third party from proposing a competing transaction,
including one that might be more favorable to Columbus shareholders than the
merger.

No solicitation

         Columbus has generally agreed not to initiate, solicit or encourage any
discussions with another party regarding a business combination while the merger
is pending unless Columbus receives an unsolicited proposal that is materially
more favorable than the terms of the merger with Key.


                                Other Information

Accounting treatment

         We expect that the merger will be accounted for as a purchase of
Columbus by Key.

Comparative per share market price information (see page __)

         On August 28, 2000, the last full trading day prior to the public
announcement of the proposed merger, Key common stock closed at $17.8125 per
share and Columbus common stock closed at $6.625 per share. On ________, 2000,
Key common stock closed at $_____ per share and Columbus common stock closed at
$____ per share.

                                                              11

<PAGE>

Material federal income tax considerations (see pages __ through __)

         We have structured the merger so that legal counsel to Columbus will be
able to deliver an opinion that Columbus shareholders (other than foreign
shareholders) will not recognize any gain or loss for federal income tax
purposes as a result of the merger, except for taxes payable by Columbus
shareholders as a result of receiving cash instead of fractional shares. It is a
condition to the merger that Columbus receives this opinion. You should review
pages __ through __ for a more complete discussion of the tax consequences of
the merger.

         Tax matters are complicated, and the tax consequences of the merger to
you will depend on the facts of your own situation. You should ask your tax
advisor in order to fully understand the particular tax consequences of the
merger to you.

Listing of Key's common stock

         Key has agreed to use its reasonable efforts to obtain approval to list
on the New York Stock Exchange the additional shares to be issued in the merger
and upon exercise of Columbus options.

No dissenter's rights

         You will have no right to seek an appraisal of the value of your shares
in connection with the merger.

Recent developments - Columbus

         In August 2000, in connection with the merger and as part of its third
quarter review, Columbus updated estimates of its proved oil and gas reserves.
Estimates by independent engineers show that proved reserves totaled 21.2 Bcfe,
down from 26.1 Bcfe at the end of the company's previous fiscal year (November
30, 1999). During the first seven months of fiscal year 2000, Columbus produced
2.3 Bcfe and downward reserve adjustments totaled 3.6 Bcfe which were partially
offset by a 1.0 Bcfe increase due to higher prices. These reserve adjustments
were due to Columbus receiving information that other operators had determined
not to develop certain locations, recent drilling activity and performance of
wells, as well as an evaluation of certain technical data. The June 30, 2000
proved reserves consisted of 14.2 Bcf of gas and 1.16 million barrels of crude
and condensate.

         As an outgrowth of the revised technical evaluation of Columbus' proved
reserves associated with its Morrow #23-1H well in Louisiana, Columbus plans to
provide for a non-cash impairment expense of approximately $500,000 in its
fiscal third quarter ending August 31, 2000.

         As of August 31, 2000, Columbus reduced its long-term debt to $4.4
million from $5.2 million at May 31, 2000.

         Columbus' net revenue interest in the Hachar #36 well was reduced from
53.7% to 3.8% after payout in August 2000. This well commenced production on May
10, 2000 at the rate of 5 MMcf of gas and 100 barrels of condensate per day.
Therefore net revenue after operating costs and production taxes from this well
was in the range of $300,000 to $360,000 per month during Columbus'
third-quarter 2000 and is expected to drop to less than $25,000 in September. A
portion of this decrease has been replaced

                                                              12

<PAGE>



by Columbus' 69% net revenue interest in the Long #5 well, a recent completion,
that is expected to generate approximately $130,000 of net revenue per month
during September 2000.


         For definitions of oil and gas terms used in this document, see
"Commonly Used Oil and Gas Terms" on page __.



                                                              13

<PAGE>

      Summary Unaudited Pro Forma Combined Financial and Other Information

         The following unaudited pro forma condensed combined financial
information combine the historical balance sheets and statements of income of
Key and Columbus giving effect to the merger using the purchase method of
accounting for business combinations. This information has been prepared to
assist you in your analysis of the financial effects of the merger and should be
read in conjunction with the unaudited pro forma combined financial information
contained on pages __ - __ in this document. You should also consider the
summary selected financial data for Key and Columbus that follows the unaudited
pro forma condensed combined financial information and the financial statements
and related notes that Key and Columbus have filed with the SEC that are
incorporated by reference.

         There are several other factors that affect comparisons of the
historical financial information of Key and Columbus to the unaudited pro forma
combined financial information, including the following:

         The unaudited pro forma combined balance sheet data gives effect to the
         merger as if it had occurred on June 30, 2000. The unaudited 1999 pro
         forma combined income statement data gives effect to the merger as if
         it occurred at the beginning of that year and the unaudited pro forma
         income statement data for the first six months of 2000 gives effect to
         the merger as if it occurred at the beginning of this year.

         Columbus's fiscal year ends on November 30. Key's fiscal year ends on
         December 31. The combined company will also utilize December 31 as its
         fiscal year end. No attempt has been made to adjust Columbus' year-end
         or interim financial information to conform to the combined company's
         fiscal year. The following pro forma June 30, 2000 summary balance
         sheet data was derived from Columbus' May 31, 2000 balance sheet and
         Key's June 30, 2000 balance sheet using the adjustments and assumptions
         described in the notes to the unaudited pro forma combined financial
         information. Similarly, the summary pro forma combined income statement
         data combines the latest dissimilar twelve-month and six-month periods
         reported by Columbus and Key, using Key's fiscal year end of December
         31 and Columbus' fiscal year end of November 30.

         The historical financial results of Columbus were prepared using the
         successful efforts method of accounting for oil and gas activities. Key
         utilizes the full cost method. The summary pro forma combined financial
         information was prepared using the full cost method of accounting for
         oil and gas activities.

         Certain items of revenue and expense reported by Columbus in its
         historical financial statements have been reclassified to conform with
         Key's method of reporting.

         Expected annual cost savings of $2 million from combining the
         operations of Key and Columbus and the $2 million of anticipated costs
         associated with the merger have not been reflected as adjustments to
         the historical data because they are prospective. However,
         merger-related expenses already recorded by Columbus in its historical
         financial statements have not been eliminated.

         The unaudited pro forma information is for illustrative purposes only.
If the merger had occurred in the past, the combined company's financial
position and operating results might have been different from that presented in
the summary

                                                              14

<PAGE>



unaudited pro forma financial information. You should not rely on the unaudited
pro forma information as an indication of the financial position or operating
results that the combined company would have achieved if the merger had occurred
in the past, nor should you rely on the unaudited pro forma information as an
indication of future results that the combined company will achieve after the
merger.

                Summary Unaudited Pro Forma Financial Information

                                             Six months,     For the year ended,
                                            June 30, 2000     December 31, 1999
                                            -------------     -----------------
                                             (In thousands, except as indicated)
Income Statement Data:
     Revenues                               $     47,148      $     66,272
     Net income                             $      9,051      $      6,035
     Basic earnings per share               $       0.69      $       0.47
     Diluted earnings per share             $       0.67      $       0.45

Production and Average Sales Prices:
     Production:
          Oil (MBbls)                                828             1,484
          Gas (MMcf)                               8,219            17,271
     Average prices:
          Oil (per barrel)                  $      26.84      $      17.47
          Gas (per Mcf)                     $       2.90      $       2.21

Balance Sheet Data:
     Total assets                           $    226,829
     Long-term debt                         $     59,200
     Stockholders' equity                   $    111,436
     Shares outstanding                           13,607
     Book value per share                   $       8.19

Proved Reserves:
     Oil (MBbls)                                  10,086
     Gas (MMcf)                                   89,983
     Total Equivalent (Bcfe)                       150.5

<TABLE>
<CAPTION>

                                            Key's Selected Summary Financial Data

                        Six Months Ended
                            June 30,                        Year Ended December 31,
                       ------------------      ------------------------------------------------
                         2000      1999        1999       1998       1997       1996       1995
                         ----      ----        ----       ----       ----       ----       ----
                                 (In thousands, except per share data)
Operating Results:
<S>                   <C>        <C>        <C>        <C>        <C>        <C>        <C>
  Revenues            $  41,077  $  21,889  $  56,258  $  37,783  $  42,151  $  37,886  $  19,297
  Net Income              9,457      1,341      6,804      4,595      9,696      7,980      3,054
  Basic earnings
    per share              0.81       0.12       0.59       0.40       0.84       0.73       0.34
  Diluted earnings
    per share              0.77       0.11       0.56       0.38       0.80       0.69       0.32

Balance Sheet Data:
  Total assets        $ 186,532  $ 168,433  $ 176,857  $ 166,295  $ 130,647  $ 95,940  $  59,199
  Long-term debt         54,000     65,000     60,000     60,000     35,000    22,500     14,600
  Stockholders' equity   86,606     71,098     76,873     69,681     64,911    55,269     35,699
</TABLE>

                                         15

<PAGE>


<TABLE>
<CAPTION>



                    Columbus' Selected Summary Financial Data

                        Six Months Ended
                             May 31,                  Year Ended November 30,
                        -----------------     ------------------------------------------
                         2000      1999      1999      1998      1997      1996     1995
                         ----      ----      ----      ----      ----      ----     ----
                    (In thousands, except per share data)
Operating results:
<S>                   <C>       <C>       <C>       <C>       <C>       <C>       <C>
  Revenues            $  6,833  $  5,023  $ 11,500  $ 12,094  $ 15,156  $ 11,815  $ 9,400
  Net income (loss)         26      (207)   (1,215)   (1,235)    2,167     2,098   (1,495)
  Basic earnings (loss)
       per share          0.01     (0.05)    (0.31)    (0.29)     0.50      0.50    (0.35)
  Diluted earnings (loss)
       per share          0.01      (0.05)   (0.31)    (0.29)     0.49      0.49    (0.35)

Balance Sheet Data:
  Total assets        $ 21,289  $ 22,055  $ 22,530  $ 23,949  $ 26,135  $ 21,625  $ 18,321
  Long-term debt         5,200     5,500     5,500     4,900     2,200     2,200     1,600
  Stockholders' equity  12,504    13,869    12,798    15,264    17,958    16,225    13,186
</TABLE>


                                                              16

<PAGE>




                                  Risk Factors

         In deciding whether to approve the merger, you should consider the
following risks related to the merger and to your investment in the combined
company following the merger. You should carefully consider these risks along
with the other information contained in this document and the documents to which
we have referred you.

                          Risks Relating to the Merger

We may not be able to successfully integrate the operations of Key and Columbus
and may not realize expected cost savings.

         We may encounter difficulties in integrating the previously separate
organizations, accounting systems and operations of Key and Columbus. The
management of the combined company will have to devote substantial attention and
resources to the integration of the two companies. The diversion of management's
attention and any difficulties it encounters in the transition and integration
processes could have an adverse effect on the revenues, levels of expenses and
operating results of the combined company. The combined company may also
experience operational interruptions or the loss of key employees. As a result,
we may not realize any of the anticipated benefits of the merger, including the
expected cost savings of approximately $2 million per year.

Because the exchange ratio is fixed, the market value of the Key common stock
issued to Columbus shareholders will depend upon the market price of Key's
common stock when the merger is completed.

         You will not receive consideration in the merger with a set market
value or a minimum market value. The number of shares of Key common stock that
you will receive in the merger is fixed. The value of these shares will depend
on the trading price of Key common stock. No adjustment will be made to the
number of shares of Key common stock to be received by you in the event of any
increase or decrease in the market price of Columbus common stock or Key common
stock. For historical and current market prices of Key and Columbus common
stock, see "Comparative Market Price Data" on page __. Because of this, at the
time of the special meeting, you will not know the exact market value of the
shares of Key common stock that they will receive when the merger is completed.

Significant charges and expenses will be incurred as a result of the merger.

         Key and Columbus expect to incur approximately $2 million of costs
related to the merger. These expenses will include financial advisor expenses,
severance, legal and accounting fees, printing expenses and other related
charges. The companies may also incur additional unanticipated expenses in
connection with the merger. These expenses and charges are expected to initially
offset the estimated cost savings of $2 million per year.


                                                              17

<PAGE>



                     Risks Relating to an Investment in Key

There is no overlap in the respective oil and gas interests owned by Key and
Columbus.

         Key's oil and gas operations are currently concentrated in the Anadarko
Basin of western Oklahoma, the Mississippi Salt Basin, south Louisiana, northern
California and Wyoming. Columbus' oil and gas properties are primarily located
in south Texas and the Williston Basin of Montana/North Dakota. As a result of
the merger, Key's management will be responsible for administering oil and gas
operations in areas in which it is not currently active. Even though Key plans
to offer employment to several of Columbus' field operations personnel, we
cannot assure you that they will choose to continue to remain employed by us or
that we can replace these individuals without experiencing operational delays
that may impact future financial performance.

Substantial or extended declines in oil or gas prices could have a material
adverse effect on us.

         Our results of operations are highly dependent upon the prices we
receive for our oil and gas production. Those prices may fluctuate widely in
response to market forces and geo-political events. Factors that have previously
caused this price volatility include:

-    changes in the supply of and demand for oil and gas;
-    weather conditions;
-    government regulations;
-    the price and availability of alternative fuels;
-    political and economic conditions in major oil exporting countries,
     particularly those in the Middle East and other members of the Organization
     of Petroleum Exporting Countries (OPEC);
-    the availability of transportation options for the movement of oil and gas;
     and
-    overall worldwide economic conditions.

         Natural gas prices will affect us more than oil prices, because
approximately 60% of our proved reserves and production will be natural gas. Our
revenues, profitability and access to outside sources of funding depend
substantially upon prevailing oil and gas prices. Prices also affect the amount
of cash flow available for capital expenditures and our future rate of growth.

         Changes in oil and gas prices also affect the limitation on capitalized
costs under the full cost method of accounting for oil and gas activities. To
apply this rule, we determine a "ceiling" by pricing future revenues at the
unescalated prices prevailing at the end of each fiscal quarter. If the net book
value of our capitalized costs exceeds the ceiling, we are required to write
down the assets with a non-recurring, non-cash charge to earnings. Key has never
taken a full-cost ceiling write-down. However, we cannot assure you that we will
not experience ceiling limitation write-downs in the future.

Estimates of oil and gas reserves, future production and future cash flow are
uncertain and may be imprecise.

Estimates of proved oil and gas reserves and estimated future production and net
revenues from such reserves are based upon various assumptions, including
assumptions required by the SEC relating to oil and gas prices, operating
expenses, capital expenditures, taxes and availability of funds. The process of
estimating proved oil
                                    18

<PAGE>



and gas reserves is also very complex, requiring many assumptions and involving
significant knowledge about available geological, geophysical, engineering and
economic data for each reservoir and well. Therefore, estimates of oil and gas
reserves, and the future production and cash flow from them, can be imprecise.

         Actual future production, oil and gas prices, revenues, taxes,
development costs, operating expenses and quantities of proved oil and gas
reserves most likely will vary from those currently estimated. Our properties
may also be susceptible to hydrocarbon drainage from wells on adjacent
properties operated by other owners. Any significant variance could materially
alter the estimated quantities and present value of our proved reserves. In
addition, we may adjust reserve estimates to reflect production history, results
of exploration and development, prevailing oil and gas prices and other factors,
many of which are beyond our control. Actual production, revenue, taxes,
development expenditures and operating expenses with respect to our combined
reserves will likely vary from the estimates currently used. Such variances
could be material.

         Proved undeveloped and non-producing proved reserves, by their nature,
are less certain to be recovered than proved developed producing reserves. The
estimates of proved reserves classified as undeveloped or non-producing include
the assumption that significant capital expenditures will be made to develop the
reserves. Independent engineers retained by Columbus estimated Columbus' proved
reserves as of June 30, 2000 to be approximately 21.2 Bcfe, including 4.0 Bcfe
of reserves classified as proved developed non-producing and 2.5 Bcfe of
reserves classified as proved undeveloped. Proved developed producing reserves
approximated 14.5 Bcfe. Although Columbus' estimates of proved developed
non-producing and proved undeveloped reserves were conducted in accordance with
industry standards, Key's management at this time cannot assure you that it will
develop these reserves. Based on Key's assumptions and economic parameters,
Key's engineers have estimated that Columbus' proved reserves as of June 30,
2000, were 15.8 Bcfe, including 14.5 Bcfe of proved developed producing
reserves.

We may not be able to replace production with new reserves.

         In general, the volume of production from oil and gas properties
declines as reserves are depleted. The decline rates depend on reservoir
characteristics. A significant portion of the production of the combined company
is from reservoirs that experience steep declines.

         Our reserves will decline as they are produced unless we conduct
successful exploration and development activities or acquire properties with
proved reserves. Our future natural gas and oil production is highly dependent
upon our level of success in finding or acquiring additional reserves. The
business of exploring for, developing or acquiring reserves is capital intensive
and uncertain. We may be unable to make the necessary capital investment to
maintain or expand our oil and gas reserves if cash flow from operations is
reduced or external sources of capital become limited. In addition, competition
for producing oil and gas properties is intense and many of our competitors have
financial and other resources that are substantially greater than those
available to us. We cannot assure you that our future exploration, development
and acquisition activities will result in additional proved reserves or that we
will be able to drill productive wells at acceptable costs.

                                                              19

<PAGE>



Our operations are subject to numerous risks of oil and gas drilling and
production activities.

         Oil and gas drilling and production activities are subject to numerous
risks, including the risk that no commercially productive oil or natural gas
reservoirs will be found. The cost of drilling and completing wells is often
uncertain. Oil and gas drilling and production activities may be delayed or
canceled as a result of a variety of factors, many of which are beyond our
control. These factors include:

-        unexpected drilling conditions;
-        pressure or irregularities in formations;
-        equipment failures or accidents;
-        weather conditions; and
-        shortages in experienced labor or delays in the delivery of equipment.

         The prevailing prices of oil and natural gas also affect the cost of
and the demand for drilling rigs, production equipment and related services.

         We cannot assure you that the new wells we drill will be productive or
that we will recover all or any portion of our investment. Drilling for oil and
natural gas may be unprofitable. Drilling activities can result in dry holes or
in wells that are productive but do not produce sufficient net revenues after
operating and other costs to produce an acceptable return on investment.

Our industry experiences numerous operating risks.

         The oil and gas industry experiences numerous operating risks. These
operating risks include the risk of fire, explosions, blow-outs, pipe failure,
abnormally pressured formations and environmental hazards. Environmental hazards
include oil spills, gas leaks, pipeline ruptures or discharges of toxic gases.
If any of these operating risks occur, we could have substantial losses.
Substantial losses may be caused by injury or loss of life; severe damage to or
destruction of property, natural resources and equipment; pollution or other
environmental damage; clean-up responsibilities; regulatory investigation and
penalties; or suspension of operations.

         We maintain insurance against some, but not all, of the risks described
above. Our insurance may not be adequate to cover losses or liabilities. Also,
we cannot predict the continued availability of insurance at premium levels that
justify its purchase.

Our future acquisitions may not contain economically recoverable reserves.

         Our growth over the last few years is due in part to acquisitions of
producing properties. The successful acquisition of producing properties
requires an assessment of a number of factors beyond our control. These factors
include recoverable reserves, future oil and gas prices, operating costs and
potential environmental and other liabilities. In connection with such
assessments, we perform a review of the subject properties that we believe is
generally consistent with industry practices. Such a review may not reveal all
existing or potential problems. In addition, the review may not permit a buyer
to become sufficiently familiar with the properties to fully assess their
deficiencies and capabilities. We do not inspect every well. Even when a well is
inspected, structural and environmental problems are not necessarily discovered.
We are generally not entitled to contractual indemnification for pre-closing
liabilities, including environmental liabilities.

                                                              20

<PAGE>



         Normally, we acquire interests in properties on an "as is" basis with
limited remedies for breaches of representations and warranties.

The marketability of our production depends primarily upon the availability of
gas gathering systems, pipelines and processing facilities.

         Our ability to sell our oil and gas production depends in part upon the
availability, proximity and capacity of oil and natural gas gathering systems,
pipelines and processing facilities. U.S. federal and state and non-U.S.
regulation of oil and gas production and transportation, general economic
conditions and changes in supply and demand all could adversely affect our
ability to produce and market oil and natural gas. If market factors change
dramatically, the financial impact on the combined company could be substantial.
The availability of markets is beyond our control.

Our oil and gas operations are subject to various governmental regulations that
materially affect our operations.

         Our oil and gas operations are subject to various U.S. federal, state
and local regulations. These regulations may be changed in response to economic
or political conditions. Matters regulated include:

        o permits for discharges of waste waters and other substances generated
          in connection with drilling operations;
        o bonds or other financial responsibility requirements to cover drilling
          contingencies and well plugging and abandonment costs;
        o the spacing of wells and unitization and pooling of properties; and
        o taxation.

         At various times, regulatory agencies have imposed price controls and
limitations on oil and gas production. In order to conserve supplies of oil and
gas, these agencies have restricted the rates of flow of oil and gas wells below
actual production capacity. Under federal and state environmental statutes,
owners and operators of certain defined facilities may be liable for spills of
oil and other regulated substances, subject to certain limitations. A
substantial spill from one of our facilities could have a material adverse
effect on our results of operations, competitive position or financial
condition. U.S. laws also regulate production, handling, storage, transportation
and disposal of oil and gas, by-products from oil and gas and other substances
and materials produced or used in connection with oil and gas operations. While
we carry insurance to mitigate the cost of environmental cleanup and third-party
liability, we cannot predict the ultimate cost of compliance with these
requirements or their effect on our operations.

We do not pay dividends.

         Key has not declared any cash dividends on its common stock in a number
of years and has no intention to do so in the near future.


                              Key After the Merger

         We expect the merger to provide Key with the following advantages:

         Increased financial strength. Our pro forma combined ratio of debt to
total book capitalization reflects an improvement to 35% from 38% on June 30,
2000. As a

                                                              21

<PAGE>



result, we believe the combined company will have more efficient access to
capital, at a lower cost, than either Key or Columbus has individually. In
addition, our unused borrowing capacity is expected to increase by 16%. We
should also have an enhanced ability, as compared with either company on a
stand-alone basis, to pursue more acquisitions or other business development
opportunities.

         Larger, more diversified asset base. Key and Columbus combined have pro
forma aggregate proved reserves of approximately 150 billion cubic feet
equivalent, a 12% increase over what Key had on a stand-alone basis at the end
of 1999.

         In addition to our existing operations in the Mid-continent region,
Gulf Coast, Rocky Mountains and northern California, we will have meaningful
operations in South Texas and the Williston Basin of Montana/North Dakota.

         Cost savings. As a result of the merger, we expect to realize $2
million in annual cost savings. We plan to consolidate corporate headquarters,
eliminate duplicative administrative staff and expenses and implement other cost
saving measures. Some of the cost savings will relate to items that are
capitalized rather than expensed in the consolidated financial statements.
Therefore, not all of the $2 million of expected savings will result in
reductions to expenses as reported in the accompanying pro forma combined
statements of income.

         Expanded cash flow. Before factoring in anticipated cost savings,
Columbus' discretionary cash flow during the first six months of fiscal 2000
exceeded $3.2 million. Discretionary cash flow, which is not a concept
recognized by generally accepted accounting principles but is commonly used in
the oil and gas industry, consists of operating cash flow before considering
either working capital changes or deduction of exploration expenses. Key's cash
flow approximated $30.7 million. A 10% larger base of cash flow should enhance
the combined company's ability to compete for and fund new growth opportunities,
including acquisitions or exploration projects.


                           Comparative Per Share Data

         The following table presents historical per share data for Key and
Columbus individually and pro forma per share data after giving effect to the
merger. The combined company pro forma per share data was derived by combining
information from the historical consolidated financial statements of Key and
Columbus using the purchase method of accounting for the merger. Columbus'
fiscal 1999 year ended November 30, 1999 and its first six months of fiscal 2000
ended May 31, 2000. Key's fiscal 1999 year ended December 31, 1999 and its first
six months of fiscal 2000 ended June 30, 2000. You should read this table in
conjunction with the pro forma financial statements included in this proxy
statement/prospectus and the historical consolidated financial statements of Key
and Columbus that are filed with the SEC. See "Where You Can Find More
Information" on page __. You should not rely on the pro forma per share data as
being necessarily indicative of actual results had the merger occurred in the
past, or of future results.



                                                              22

<PAGE>

<TABLE>
<CAPTION>



                                                                                 Columbus
                                                      COMBINED       -------------------------
                                           KEY        COMPANY                       EQUIVALENT
                                         HISTORICAL   PRO FORMA(1)   HISTORICAL(2)  PRO FORMA(3)
                                          ----------   ------------   -------------  -----------
Net earnings (loss) per share--basic:
<S>                                       <C>          <C>          <C>               <C>
  First six months of fiscal 2000.......  $  0.81      $  0.69      $ 0.01            $ 0.25
  Fiscal year 1999......................     0.59         0.47      (0.31)              0.17

Net earnings (loss) per share--diluted:
  First six months of fiscal 2000.......     0.77         0.67       0.01               0.24
  Fiscal year 1999.....................      0.56         0.45      (0.31)              0.16

Book value per share:
  End of six months of fiscal 2000.....      7.06         8.19       3.34               2.91
</TABLE>

------------------------
(1)      The combined company's pro forma data includes the effect of the merger
         on the basis described in the notes to the unaudited pro forma combined
         financial statements included elsewhere in this document.

(2)      These are historical amounts reported by Columbus without any
         adjustments to conform its successful efforts method and other
         accounting policies to the full cost method and other accounting
         policies of Key.

(3)      Columbus' equivalent pro forma amounts have been calculated by
         multiplying the combined company's pro forma net earnings and book
         value per share amounts by the exchange ratio of 0.355 shares of Key
         common stock for each share of Columbus common stock, so that the
         Columbus equivalent pro forma per share amounts are comparable to the
         respective values presented with respect to one share of Columbus
         common stock.


                                     23

<PAGE>




                          Comparative Market Price Data

         The following table sets forth the high and low sales prices of Key
common stock, on the New York Stock Exchange, and of the Columbus common stock,
on the American Stock Exchange, for the periods indicated. The sales prices are
as reported in published financial sources.

                                             Key                  Columbus
                                        -------------         --------------
                                        HIGH    LOW           HIGH     LOW
                                        ----    -----         ----     ----

1998:
Quarter Ended March 31, 1998........    11.625  9.937         8.182(1)  7.125(1)
Quarter Ended June 30, 1998.........    12.625 10.000         7.625     7.000
Quarter Ended September 30, 1998....    12.250  5.875         7.500     6.250
Quarter Ended December 31, 1998.....     9.500  5.000         6.688     6.375

1999:
Quarter Ended March 31, 1999........     7.750  5.250         6.750     5.500
Quarter Ended June 30, 1999.........    10.063  7.125         6.250     5.500
Quarter Ended September 30, 1999....    11.000  9.063         6.000     5.250
Quarter Ended December 31, 1999.....     9.688  6.750         5.750     5.375

2000:
Quarter Ended March 31, 2000........    13.938  6.938         6.000     5.500
Quarter Ended June 30, 2000.........    20.938 11.625         7.250     5.500
Quarter Ending September 30, 2000
  through September 8, 2000             19.625 13.625         6.875     5.750
-------------------
         Price per share amounts have been adjusted for the 10% stock dividend
distribution to shareholders of record on February 23, 1998.

    On August 28, 2000, the last full trading day prior to the joint public
announcement by Key and Columbus of the proposed merger, the last reported sales
price on the New York Stock Exchange of shares of Key common stock was $17.8125.
The last reported sales price of Columbus common stock on the American Stock
Exchange on the same day was $6.625. On September 8, 2000, the last reported
sales price for Key common stock on the New York Stock Exchange was $19.25 and
$6.50 for Columbus common stock on the American Stock Exchange. Columbus
shareholders are urged to obtain current quotations before deciding how to vote.

    Key has not paid dividends on its common stock in a number of years and has
no intention to do so in the near future. In addition, Key is restricted from
doing so by its credit agreement.


                                                              24

<PAGE>



               Unaudited Pro Forma Combined Financial Information

         The following unaudited pro forma financial information has been
prepared to assist you in your analysis of the financial effects of the merger.
We derived this information from Key's audited financial statements for the year
ended December 31, 1999 and unaudited financial statements for the six months
ended June 30, 2000 and from Columbus' audited financial statements for the
fiscal year ended November 30, 1999 and unaudited financial statements for the
six months ended May 31, 2000. The information is only a summary and you should
read it in conjunction with the historical financial statements and related
notes contained in the annual reports and other information that Key and
Columbus have filed with the Securities and Exchange Commission. See "Where You
Can Find More Information" on page __.

         You should consider several factors when comparing the historical
financial information of Key and Columbus to the unaudited pro forma financial
information, including the following:

         The unaudited pro forma condensed combined balance sheet gives effect
         to the merger as if it had occurred on June 30, 2000. The unaudited
         1999 pro forma combined statement of income gives effect to the merger
         as if it occurred on January 1, 1999. The unaudited pro forma combined
         statement of income for the first six months of 2000 gives effect to
         the merger as if it occurred on January 1, 2000.

         Columbus' fiscal year ends on November 30. Key's fiscal year ends on
         December 31. The combined company will also utilize December 31 as its
         fiscal year end. No attempt has been made to roll forward Columbus'
         year-end or interim financial information to conform to the combined
         company's fiscal year. The following unaudited pro forma condensed
         combined balance sheet as of June 30, 2000 was derived from Columbus'
         May 31, 2000 balance sheet and Key's June 30, 2000 balance sheet using
         the adjustments and assumptions described in the notes to the unaudited
         pro forma combined financial information. Similarly, the unaudited pro
         forma combined statements of income combine the latest dissimilar
         twelve-month and six-month periods presented for Columbus and Key, as
         adjusted, as if Columbus utilized a fiscal year end of December 31.

         Columbus prepared its historical financial results using the successful
         efforts method of accounting for oil and gas activities. Key utilizes
         the full cost method. The combined company will also utilize full cost.

         Certain revenue and expense items reported by Columbus on its
         historical statements of income and balance sheet have been
         reclassified to conform to the method of presentation utilized by Key.

         Expected annual cost savings of $2 million have not been reflected as
         an adjustment to the historical data. The cost savings are expected to
         result from the consolidation of the corporate headquarters of Key and
         Columbus, the elimination of duplicate staff and expenses and a
         reduction in the use of outside consultants currently utilized by
         Columbus. Some of the cost savings will relate to items that, under the
         full cost method of accounting, would have been capitalized rather than
         expensed in the combined financial statements. Therefore, not all of
         the $2 million of expected savings will result in reductions to
         expenses as reported in the accompanying unaudited pro forma combined
         statement of income.


                                                              25

<PAGE>



          Columbus has accrued $119,000 as of May 31, 2000 for advisory and
          legal fees associated with its merger/sale activities in its
          historical financial results. These costs have not been eliminated in
          the pro forma adjustments.

          The unaudited pro forma information is for illustrative purposes only.
          If the merger had occurred in the past, the combined company's
          financial position and operating results might have been different
          from that presented in the unaudited pro forma condensed combined
          financial statements. In addition, the purchase price allocation is
          preliminary and will be finalized following closing of the merger. You
          should not rely on the unaudited pro forma information as an
          indication of the financial position or operating results that the
          combined company would have achieved if the merger had occurred in the
          past. You also should not rely on the unaudited pro forma information
          as an indication of future results that the company will achieve after
          the merger.



                                                              26

<PAGE>

<TABLE>
<CAPTION>


                   Unaudited Pro Forma Condensed Balance Sheet
                                  June 30, 2000
                                 (In Thousands)

                                                               Pro Forma
                                          Key      Columbus    Adjustments   Combined
ASSETS                                  -------    --------    -----------   -----------
Current Assets:
<S>                                    <C>         <C>         <C>           <C>
     Cash and cash equivalents         $   4,102   $  1,892    $             $    5,994
     Receivables                          15,839      2,734                      18,573
     Prepaid expenses and other            1,327        302      (110)(b)         1,519
                                          ------      -----                   ---------
                                          21,268      4,928                      26,086
                                          ------    -------                   ---------

Deferred income taxes                        -        1,025    (1,025)(b)          -

Oil and gas properties, net              163,561     14,827    20,143 (a)       198,531

Other assets, net                          1,703        509                       2,212
                                          ------   --------                   ---------

Total Assets                          $  186,532   $ 21,289                   $ 226,829
                                      ==========   ========                   =========


LIABILITIES AND STOCKHOLDERS' EQUITY
Current Liabilities:
     Accounts payable                 $   12,561   $  2,069                  $   14,630
     Accrued expenses and other            5,598      1,516                       7,114
                                      ----------   --------                  ----------
                                          18,159      3,585                      21,744
                                      ----------   --------                  ----------

Long-term debt                            54,000      5,200                      59,200

Deferred Credits and Other
  Non-Current Liabilities:
     Deferred income taxes                26,809         -      6,682 (a)        33,491
     Other                                   958         -                          958
                                      ----------   --------                  ----------
                                          27,767         -                       34,449

Stockholders' Equity:
     Common stock                          3,145        930      (597)(c)         3,478
     Paid-in capital                      38,597     20,097     4,400 (c)        63,094
     Retained earnings
        (accumulated deficit)             47,975     (2,629)    2,629 (c)        47,975
     Treasury stock                       (3,111)    (5,894)    5,894 (c)        (3,111)
                                      ----------   --------                  -----------
                                          86,606     12,504                     111,436
                                      ----------   --------                  ----------

Total Liabilities and
     Stockholders' Equity             $  186,532   $ 21,289                  $  226,829
                                      ==========   ========                  ==========

</TABLE>

                                                              27

<PAGE>

<TABLE>
<CAPTION>


                                           Unaudited Pro Forma Statement of Income
                                            For the Six Months Ended June 30, 2000
                                            (In Thousands, Except Per Share Data)

                                                               Pro Forma
                                          Key      Columbus    Adjustments   Combined
Revenues:                               --------   ---------   -----------   ----------
<S>                                    <C>         <C>           <C>
Oil and gas sales                      $  40,868   $    6,071    $           $   46,939
Operating and management services            -            693     (693)(d)          -
Other                                        209           69      (69)(d)          209
                                       ---------   ----------                ----------
                                          41,077        6,833                    47,148
                                       ---------   ----------                ----------

Expenses:
Depreciation, depletion and
     amortization                         16,264        1,482    2,382 (e)       20,128
Lease operating                            5,714        1,022     (693)(d)        6,477
                                                                   434 (d)
Operating and management services            -            434     (434)(d)          -
Production and property taxes              1,244          585                     1,829
General and administrative                 1,421          877                     2,298
Litigation expense                           -            367                       367
Advisory fee                                 -            119                       119
Financial costs:
     Interest expense                      2,239          217                     2,456
     Capitalized interest                   (735)         -         (7)(f)         (742)
     Interest income                         (81)         -        (69)(d)         (150)
Exploration expense                          -          1,690   (1,690)(e)          -
                                       ---------   ----------                ----------
                                          26,066        6,793                    32,782
                                       ---------   ----------                ----------

Income Before Income Taxes                15,011           40                    14,366

Provision for Income Taxes                 5,554           14     (253)(g)        5,315
                                      ----------   ----------                ----------

Net Income                            $    9,457  $        26                $    9,051
                                      ==========  ===========                ==========

Basic Earnings Per Share              $      .81  $       .01                $      .69
                                      ==========  ===========                ==========

Diluted Earnings Per Share            $      .77  $       .01                $      .67
                                      ==========  ===========                ==========

Weighted Average Basic Shares             11,748        3,761   (2,428)(h)       13,081
                                      ==========  ===========                ==========

Weighted Average Diluted Shares           12,212        3,763   (2,430)(h)       13,545
                                      ==========  ===========                ==========

</TABLE>

                                                              28

<PAGE>


<TABLE>
<CAPTION>

                                           Unaudited Pro Forma Statement of Income
                                        For the Twelve Months Ended December 31, 1999
                                            (In Thousands, Except Per Share Data)

                                                               Pro Forma
                                          Key      Columbus    Adjustments   Combined
Revenues:                               --------   ---------   -----------   ----------
<S>                                   <C>         <C>            <C>         <C>
Oil and gas sales                     $   55,798  $    10,014    $           $   65,812
Operating and management services            -          1,386   (1,386)(d)          -
Other                                        460          100     (100)(d)          460
                                      ----------     --------                ----------
                                          56,258       11,500                    66,272
                                      ----------     --------                ----------

Expenses:
Depreciation, depletion and
     amortization                         28,672        3,400    3,690 (e)       35,762
Lease operating                            8,951        1,903   (1,386)(d)       10,352
                                                                   884 (d)
Operating and management services            -            884     (884)(d)          -
Production and property taxes              2,623        1,029                     3,652
General and administrative                 2,550        1,336                     3,886
Litigation expense                           -            119                       119
Retirement and separation                    -            111                       111
Financial costs:
     Interest expense                      4,081          373                     4,454
     Capitalized interest                 (1,397)         -        (12)(f)       (1,409)
     Interest income                        (197)         -       (100)(d)         (297)
Impairments                                  -            973     (973)(e)          -
Exploration expense                          -          3,071   (3,071)(e)          -
Other                                        -             62                        62
                                      ----------     --------                ----------
                                          45,283       13,261                    56,692
                                      ----------     --------                ----------

Income (Loss) Before Income Taxes         10,975       (1,761)                    9,580

Provision (Benefit) for
     Income Taxes                          4,171         (546)      80 (g)        3,545
                                      ----------     --------                ----------

Net Income (Loss)                    $     6,804    $  (1,215)               $    6,035
                                     ===========    =========                ==========

Basic Earnings (Loss) Per Share      $       .59    $    (.31)               $      .47
                                     ===========    =========                ==========

Diluted Earnings (Loss) Per Share    $       .56    $    (.31)               $      .45
                                     ===========    =========                ==========

Weighted Average Basic Shares             11,537        3,898   (2,565)(h)       12,870
                                     ===========    =========                ==========

Weighted Average Diluted Shares           12,111        3,898   (2,565)(h)       13,444
                                     ===========    =========                ==========

</TABLE>

                                                              29

<PAGE>




Notes to unaudited pro forma combined financial information

Note 1 - Basis of Presentation

Key will account for the merger of Key and Columbus as a purchase of Columbus.
In the merger, Key will issue 1,333,000 common shares to shareholders of
Columbus. Columbus will become a wholly owned subsidiary of Key.

The accompanying pro forma condensed combined balance sheet includes pro forma
adjustments to give effect to the acquisition of Columbus by Key as of June 30,
2000. The pro forma combined statements of income for the year ended December
31, 1999 and the six months ended June 30, 2000 include the historical revenue
and expenses of Key and Columbus for those twelve and six month periods and
adjustments for the pro forma effects of the acquisition as if the transaction
had occurred at the beginning of the respective periods presented.

Key's fiscal year ends on December 31, while Columbus' ends on November 30. The
unaudited pro forma income statements were prepared as if Columbus' results from
operations for its fiscal year ended November 30, 1999 and six months ended May
31, 2000 were the same as they would have been for the twelve and six month
periods ended December 31, 1999 and June 30, 2000, respectively. Similarly, the
unaudited pro forma condensed combined balance sheet was prepared assuming that
Columbus' historical balance sheet at May 31, 2000 was in effect on June 30,
2000.

Key's and Columbus' financial statements were prepared in accordance with
generally accepted accounting principles and require Key and Columbus to make
estimates that affect the reported amount of assets, liabilities, revenues and
expenses. In the opinion of Key and Columbus, the unaudited pro forma combined
financial statements include all the adjustments necessary to present fairly the
results of the periods presented.

The accompanying pro forma statements do not include all information and notes
required by generally accepted accounting principles for complete financial
statements. However, except as disclosed herein, there has been no material
change in the information disclosed in the notes to consolidated financial
statements included in the Annual Report on Form 10-K of Columbus for the year
ended November 30, 1999 and Key for the year ended December 31, 1999. In the
opinion of management, all adjustments considered necessary for a fair
presentation have been included.

Note 2 - Pro Forma Adjustments

The following adjustments have been made to the pro forma condensed combined
balance sheet of Key and Columbus at June 30, 2000 and to the statements of
income for the year and six months ended December 31, 1999 and June 30, 2000.

(a) This entry adjusts the historical book values of Columbus' assets and
liabilities to their estimated fair values as of June 30, 2000. The calculation
of the total purchase price and the preliminary allocation to assets and
liabilities are shown below:


                                                         30

<PAGE>

<TABLE>
<CAPTION>



                                                                          (in $ thousands,
                                                                       except share price)
                                                                       -------------------
Calculation and preliminary allocation of purchase price:

<S>                                                                          <C>
Shares of Key common stock to be issued to Columbus stockholders             1,333
Average Key stock price                                                    $18.01
                                                                            ------
Fair value of Key common stock issued                                       24,005
         Plus fair value of Columbus employee stock options to be
                  assumed by Key                                               825
         Plus fair value of liabilities assumed by Key:
                  Current liabilities                                        3,585
                  Long-term debt                                             5,200
                  Deferred taxes                                             6,682
                                                                            -------
         Total purchase price                                               40,297
         Less fair value of non oil and gas assets to be acquired by Key:
                  Current assets                                             4,818
                  Non oil and gas properties                                   509
                                                                           -------

         Fair value allocated to oil and gas properties,
          including $1 million of undeveloped leasehold                      34,970
                                                                            =======
</TABLE>


         The closing market price of Key common stock on the day of the merger
announcement was $18.25. The cost of the acquisition reflects the average of
that price and the closing prices of Key common stock for the two days preceding
and following announcement, which average price was $18.01.

         The entry to record the purchase transaction provides a step-up for the
SFAS 109 effect of the difference between the new book basis and historical
carryover tax basis of Columbus' oil and gas assets.

(b)      This adjustment removes deferred tax assets previously recorded on
Columbus' historical balance sheet.

(c) These pro forma adjustments represent the allocation of the fair value of
common stock issued by Key and eliminates any retained earnings or treasury
shares of Columbus. Key will issue approximately 1.33 million shares of $0.25
par value common stock to accomplish the merger, or 0.355 share for each
Columbus share outstanding. The pro forma combined stockholders' equity reflects
the following:

                                                                  (in thousands)

Stockholders' equity of Key at June 30, 2000                            $ 86,606
Fair value of common stock issued in purchase                             24,005
Fair value of stock options assumed by Key                                   825
                                                                        --------
Pro forma stockholders' equity                                          $111,436

(d) Reclassifies operating and management services revenues and expenses, as
well as certain other expenses, to conform with Key's method of presentation.

(e) Adjusts depreciation, depletion and amortization to account for the
acquisition as if the acquisition had occurred at the beginning of the period
presented in a manner consistent with the full cost method of accounting for oil
and gas activities utilized by Key. These adjustments also eliminate historical
amounts recorded by

                                                              31

<PAGE>



Columbus under the successful efforts accounting method for exploration expense
and asset impairments to conform to full cost accounting.

(f) Adjustment to capitalize interest on the pro forma amount of purchase price
allocated to unproved properties.

(g) To account for the income tax effect of the pro forma adjustments, using the
expected tax rate of the combined company. This 37% pro forma rate reflects a
Federal statutory rate of 34% and effective state income tax rate of 3%.

(h) Adjusts the pro forma combined weighted average basic and diluted shares
outstanding for the periods presented.


Note 3 - Cost Savings and Expenses of the Merger

Expected annual cost savings of $2 million have not been reflected as an
adjustment to the historical data because it is prospective information
pertaining to what may happen once the companies are combined. Likewise,
estimated future costs associated with accomplishing the merger have not been
factored into the pro forma presentation of historical financial results, nor
have expenses recorded by Columbus related to its evaluation of strategic
alternatives been eliminated.


Note 4 - Selected Pro Forma Supplemental Oil and Gas Information

The tables set forth below reflect unaudited pro forma disclosures about the
combined company's oil and gas activities. The information was prepared from,
and should be read in conjunction with, the related information in Key's 1999
Form 10-K and latest Form 10-Q and Columbus' 1999 Form 10-K and latest Form 10-Q
that are incorporated by reference in this proxy statement/prospectus.

Production and average sales price information
<TABLE>
<CAPTION>

For the twelve months ended December 31, 1999
                                                                                                 Oil        Gas
                                                                                               ------     ------
<S>                                                                                             <C>       <C>
Production (oil in thousands of barrels; gas in million cubic feet)                             1,484     17,271
Average sales prices (per barrel of oil and per Mcf of gas)                                    $17.47    $ 2.21

For the six months ended June 30, 2000
                                                                                                 Oil        Gas
                                                                                               ------     ------
Production (oil in thousands of barrels; gas in million cubic feet)                               828     8,219
Average sales prices (per barrel of oil and per Mcf of gas)                                    $26.84    $ 2.90
</TABLE>

Productive wells at December 31, 1999

                                  Oil                       Gas
                            -------------             ----------------
Area                        Gross     Net              Gross     Net
------------------          -----    ------           -----     -----
Mid-continent                 193      68.2              655     125.7
Gulf Coast                    217      32.6              322      40.6
Rocky Mountains               720      66.8              120       5.6
California                     --        --               27      22.6
                            -----     -----            -----     -----
                            1,130     167.6            1,124     194.5

Net undeveloped acres at December 31, 1999


                                                              32

<PAGE>



California                        22,138
Colorado                             593
Louisiana                          3,058
Mississippi                       20,713
Montana                           10,389
New Mexico                           630
North Dakota                         277
Oklahoma                           9,611
Texas                             24,724
Utah                              13,216
Wyoming                           54,033
                                 -------
                                 159,382

Estimated quantities of proved oil and gas reserves

                                 Key        Columbus(1)          Combined
Oil (MBbls)                      9,220              866            10,086
Gas (MMcf)                      79,351           10,632            89,983
Equivalent (Bcfe)*               134.7             15.8             150.5

* One barrel of oil is the energy equivalent of six Mcf of natural gas

(1) Columbus' proved oil and gas reserves as estimated by its independent
engineers were reported as 26.1 Bcfe in its annual report on Form 10-K for the
year ended November 30, 2000. In August 2000, the reserve estimates were updated
as of June 30, 2000 and proved reserves totaled 21.2 Bcfe, including 4 Bcfe and
2.5 Bcfe classified as proved developed non-producing and proved undeveloped,
respectively. During the first seven months of Columbus' fiscal 2000, 2.3 Bcfe
was produced and downward reserve adjustments totaled 3.6 Bcfe which were
partially offset by a 1.0 Bcfe increase due to higher prices. These reserve
adjustments were due to Columbus receiving information that other operators had
determined not to develop certain locations, recent drilling activity and
performance of wells, as well as an evaluation of certain technical data. The
June 30, 2000 reserves consisted of 14.2 Bcf of gas and 1.16 million barrels of
crude and condensate.

Undeveloped and non-producing proved reserves, by their nature, are less certain
to be recovered than proved developed producing reserves. The estimates of
proved reserves classified as undeveloped or non-producing include the
assumption that significant capital expenditures will be made to develop the
reserves. Although the estimates of proved developed non-producing and proved
undeveloped reserves that were prepared for Columbus were conducted in
accordance with industry standards, Key's management cannot at this time assure
that the development of those reserves will occur. As such, and based on its
assumptions and economic parameters, Key's engineers have estimated that
Columbus' proved reserves on June 30, 2000, were 15.8 Bcfe, including 14.5 Bcfe
of proved producing reserves.




                                                         33

<PAGE>



             The Columbus Shareholder Meeting and Proxy Solicitation

Date, time and place            October __, 2000, at 9:00 a.m. (local time), at
                                the Wells Fargo Bank Building Forum Room, Main
                                Floor, 1740 Broadway, Denver, Colorado

Purpose                         To consider and vote upon a proposal to approve
                                the merger agreement and the merger, and any
                                other business that may be presented at the
                                meeting. We know of no other matters to be
                                brought before the meeting.

Record date                     Close of business on __________, 2000. Only
                                holders of record of Columbus common stock at
                                the close of business on the record date will be
                                entitled to notice of, and to vote at, the
                                meeting.

Recommendation of the
board of directors              The Columbus board of directors believes that
                                the merger agreement and the merger are in the
                                best interests of Columbus and its shareholders
                                and recommends that the Columbus shareholders
                                vote for approval of the merger agreement and
                                the merger.

Shares held in street
name                            If you hold your Columbus shares in the name of
                                a bank, broker or other nominee, you should
                                follow the instructions provided by your bank,
                                broker or nominee when voting your shares or
                                when granting or revoking a proxy. Under the
                                rules of the American Stock Exchange, brokers
                                who hold shares in street name for customers
                                have the authority to vote on certain "routine"
                                proposals when they have not received
                                instructions from beneficial owners. Under these
                                rules, such brokers are precluded from
                                exercising their voting discretion with respect
                                to proposals for non-routine matters such as the
                                merger agreement and the merger. Thus, absent
                                specific instructions from you, your broker is
                                not empowered to vote your shares with respect
                                to the approval and adoption of the merger
                                agreement and the merger (i.e., "broker
                                non-votes"). A broker non-vote will have the
                                same effect as a vote against the merger.

Quorum                          Presence, in person or by proxy, of shareholders
                                holding a majority of the outstanding shares of
                                common stock entitled to vote at the meeting.
                                Abstentions and broker non-votes will be counted
                                as shares present for purposes of determining
                                the presence of a quorum at the meeting. If a
                                quorum is not present at the meeting, Columbus
                                expects to adjourn or postpone the meeting in
                                order to solicit additional proxies.

Votes required                  Approval of the merger agreement and the merger
                                requires the affirmative vote of the holders of
                                a majority of the outstanding shares of Columbus
                                common stock.


                                                              34

<PAGE>



                                Abstentions will have the same effect as votes
                                against the merger agreement and the merger.

Shares outstanding              As of the record date, there were ______ shares
                                of Columbus common stock outstanding and
                                entitled to vote and held by ____ holders of
                                record.

Proxies                         A proxy card will be sent to each Columbus
                                shareholder as of the record date. If you
                                received a proxy card, you may grant a proxy to
                                vote on the proposal to approve the merger
                                agreement by marking your proxy card
                                appropriately, executing it in the space
                                provided and returning it to Columbus. If you
                                hold your Columbus shares in the name of a bank,
                                broker or other nominee, you should follow the
                                instructions provided by your bank, broker or
                                nominee when voting your shares. If you have
                                timely submitted a properly executed proxy card,
                                clearly indicated your vote and have not revoked
                                your proxy, your shares will be voted as
                                indicated. If you have timely submitted a
                                properly executed proxy card and have not
                                clearly indicated your vote, your shares will be
                                voted FOR the proposal to approve the merger
                                agreement and merger.

                                If any other matters are properly presented at
                                the meeting for consideration, the persons named
                                in the proxy card will have the discretion to
                                vote on these matters in accordance with their
                                best judgment.

Voting by holders of
common stock                    Each share of Columbus common stock is entitled
                                to one vote at the meeting.

Revocation                      You may revoke your proxy card at any time prior
                                to its exercise by:

                         o giving written notice of your revocation to the
                           secretary of Columbus;

                         o appearing and voting in person at the meeting; or

                         o properly completing and executing a later-dated
                           proxy and delivering it to the secretary of Columbus
                           at or before the meeting.

                                Your presence without voting at the meeting will
                                not automatically revoke your proxy and any
                                revocation during the meeting will not affect
                                votes previously taken.

Validity                        The inspectors of election will determine all
                                questions as to the validity, form,
                                eligibility(including time of receipt) and
                                acceptance of proxy cards. Their determination
                                will be final and binding. The board of
                                directors of Columbus has the right to waive any
                                irregularities or conditions as to the manner of
                                voting. Columbus may accept your proxy by any
                                form of communication permitted by Colorado law
                                so long as Columbus is reasonably assured that
                                the communication is authorized by you.

                                                              35

<PAGE>




Solicitation of
proxies                         The accompanying proxy is being solicited on
                                behalf of the board of directors of Columbus.
                                The expenses of preparing, printing and mailing
                                the proxy and the materials used in the
                                solicitation will be shared by Columbus and Key.
                                Proxies may be solicited by personal interview,
                                telephone and telegram by directors, officers
                                and employees of Columbus, who will not receive
                                additional compensation for performing that
                                service. Arrangements also may be made with
                                brokerage houses and other custodians, nominees
                                and fiduciaries for the forwarding of
                                solicitation materials to the beneficial owners
                                of Columbus shares held by such persons and
                                Columbus will reimburse them for reasonable
                                expenses they incur.

Auditors                        PricewaterhouseCoopers LLP serves as the
                                independent public accountants of Columbus.
                                Representatives of PricewaterhouseCoopers LLP
                                plan to attend the shareholders meeting and will
                                be available to make a statement at the meeting
                                if they so desire, although it is not expected
                                that any statement will be made.


                                                              36

<PAGE>



                                   The Merger

    This section of the proxy statement/prospectus describes the proposed
merger. While we believe that the description covers the material terms of the
merger and the related transactions, it may not contain all of the information
that is important to you. In addition, we incorporate important business and
financial information about Key and Columbus into this proxy
statement/prospectus by reference. You may obtain the information incorporated
by reference into this proxy statement/ prospectus without charge by following
the instructions in the section entitled "Where You Can Find More Information"
on page __.

Background of the merger

         The management and board of Columbus regularly review Columbus'
position in light of the changing competitive environment of the oil and gas
industry with the objective of determining what alternatives are available to
enhance shareholder value. In recent years the management of Columbus has
considered a range of options to improve Columbus' competitive position,
including acquisitions, divestitures, joint ventures and other strategic
alliances.

         During the fall of 1999, the board of directors of Columbus began
considering steps to maximize shareholder value in Columbus. The Columbus Board
did not believe that Columbus had sufficient liquidity for its shareholders and
that a continuing decline in oil prices had depressed the oil and gas industry
causing the board of directors to believe that Columbus might be willing to
consider a strategic combination.

         On February 17, 2000, Columbus' board engaged AA Corporate Finance, as
its financial advisor, to assist Columbus with exploring strategic alternatives
to maximize shareholder value, which included consideration of a sale or merger
of Columbus. Shortly thereafter, Columbus publicly announced its engagement of
AA Corporate Finance.

         The board of directors of Columbus with the assistance of AA Corporate
Finance conducted a financial review of Columbus and proceeded to identify
companies that might be interested in a strategic transaction with Columbus. In
early April 2000, Columbus contacted over 100 companies to solicit their
interest in a possible combination with Columbus. Columbus informed each
potential acquirer that if it were interested in seeking to acquire Columbus it
must sign a confidentiality agreement, following which they would receive a
confidential information memorandum regarding Columbus and its reserves,
production and other assets. They were also advised that if they were interested
in pursuing a transaction with Columbus after reviewing the confidential
information that they should submit a preliminary proposal by May 1, 2000. The
potential acquirers were advised that it was Columbus' strong preference that
any proposed transaction be structured so as to be tax-free to Columbus
shareholders. Over 30 companies, including Key, submitted preliminary offers to
merge with or to purchase the outstanding stock of Columbus.

         After reviewing the preliminary proposals with the assistance of AA
Corporate Finance, a limited number of those companies (including Key) were
invited to review more detailed data about Columbus and to meet with
representatives of Columbus management, AA Corporate Finance, and Columbus'
outside independent engineers and geologic consultants. The interested acquirers
were advised that they were to submit formal offers by June 21, 2000.


                                                              37

<PAGE>

         Based on Key's review of this data, Key's engineers prepared an
assessment of Columbus' proved reserve quantities and values under a variety of
pricing scenarios and at various effective dates and on June 21, 2000, Key
submitted to Columbus its proposal for an initial exchange ratio of 0.346 shares
of Key common stock for each share of Columbus common stock, subject to
customary conditions, approvals and due diligence investigation.

         On June 26, 2000, Columbus' board held a special meeting at which AA
Corporate Finance made a detailed presentation as to the status of the
merger/sale process and the proposals that were received by Columbus. Columbus'
board reviewed and discussed in detail each of the proposals received by
Columbus. After AA Corporate Finance's presentation and the board's review, the
board requested AA Corporate Finance to present to each potential candidate the
investment considerations concerning an investment in Columbus as described in
the confidential information memorandum that would support an increase in the
consideration they were offering.

         During Key's due diligence investigations prior to and following its
initial proposal, there were a number of informal discussions between senior
officers of Key and Columbus and among Key's engineers and Columbus' independent
engineers regarding technical data pertaining to Columbus' proved reserves. On
July 5, representatives from Columbus met with members of Key's management to
discuss Key's initial proposal and technical differences in the evaluations by
the parties of Columbus' oil and gas reserves. Present at that meeting from
Columbus were Harry A. Trueblood, Jr., President, Chairman of the Board and CEO,
Clarence H. Brown, Executive Vice President and COO, and J. Samuel Butler, a
member of Columbus' board of directors. Representatives from Key included Monroe
R. Robertson, Key's president and COO, Joseph Albi, Key's vice-president of
engineering, Paul Korus, Key's vice-president and CFO, and Gary Abbott, one of
Key's petroleum engineers.

        On July 7, 2000, the Columbus Board held a special meeting to review the
ongoing discussions with the proposed acquirors. AA Corporate Finance reported
to the Columbus board that one of the companies had increased its exchange ratio
and that Key would consider increasing its offer as soon as it completed further
due diligence concerning Columbus reserve information, which could not be done
until the early part of the following week. During this meeting, AA Corporate
Finance again reviewed the procedures which had been followed to obtain interest
of potential acquirers, the number of companies contacted, and the proposals
received by Columbus from companies who had participated. The board believed
that each of the proposing companies were candidates whose equity securities
would be acceptable to Columbus shareholders. The board noted that after the
increase in the price by one bidder, the valuations placed on Columbus by the
bidders were close in amount even though they had been arrived at independently.
At this point AA Corporate Finance was excused from the meeting while the board
considered the advantages and disadvantages associated with each proposal it had
received and each proposing company. After lengthy discussion of each of the
proposals and the attributes of each proposing company, the board concluded that
the proposal by Key was superior. After further discussion, the board directed
Columbus' senior management to begin to negotiate definitive terms of a formal
merger agreement with Key.

         Senior management of Columbus, led by Michael Logan, vice president of
corporate development and marketing, conducted negotiations with Key's
negotiating team, led by Stephen Bell, vice president of land and business
development. Mr. Logan regularly reported to Columbus' Executive Committee to
discuss the status of negotiations and continually sought input on the detailed


                                       38

<PAGE>



structure of the transaction. Columbus' legal counsel regularly provided
Columbus with its comments concerning the structure of the transaction and the
proposed terms of the merger agreement.

         Mr. Bell also reported regularly on the progress of the negotiations to
Key's chairman of the board and CEO, F.H. Merelli and Mr. Robertson. During the
negotiations, discussions also continued between Joseph Albi, Michael Logan and
Columbus' independent engineers.

         Upon further detailed review by Key engineers of the technical data
pertaining to some of the wells operated by Columbus, on July 14, Key revised
the terms of its merger proposal to include an exchange ratio of 0.355 shares of
Key common stock for each Columbus share.

         On July 17, Holme Roberts & Owen LLP, counsel for Key, delivered an
initial draft of the merger agreement to Columbus and its counsel, Sherman &
Howard L.L.C.

         Negotiations continued throughout the rest of July and most of August
among Columbus' and Key's executives and counsel to reach agreement on the terms
of the definitive merger agreement. The issues discussed in these negotiations
included:

         -     indemnification of the officers and directors of Columbus;
         -     the payment of severance to employees of Columbus;
         -     the treatment of stock options issued by Columbus; and
         -     appropriate provisions and fees for termination of the merger
               agreement.

         On August 15, 2000, AA Corporate Finance was retained by Columbus for
the purpose of rendering a fairness opinion to the Columbus board. AA Corporate
Finance then began its analysis of Columbus and Key in connection with rendering
a fairness opinion.

         On August 28, 2000, the Columbus board of directors held a special
meeting to discuss the final terms of the proposed merger with Key. Prior to the
meeting, each board member received a draft of the proposed merger agreement. At
the meeting, Columbus' management and legal and financial advisors reviewed with
the board:

         -     the principal terms of the merger agreement;
         -     the potential benefits and risks of the transaction with Key;
         -     the strategic rationale for and financial analysis relating to
               the proposed merger;
         -     a presentation by AA Corporate Finance of the procedures that
               had been followed to obtain interest of potential acquirers,
               the number of companies contacted, and the proposals received
               from the companies who participated; and
         -     an updated report on Columbus' due diligence investigations of
               Key.

         There was also a discussion led by Mr. Trueblood of the strategic plans
of Columbus and the impact that the proposed combination would have on these
plans.

         In addition, at this meeting, AA Corporate Finance rendered to the
Columbus board of directors its fairness opinion to the effect that, as of the
date of the opinion and based on and subject to the matters described in the
opinion, the exchange ratio pursuant to the merger agreement was fair, from a
financial point of view, to the


                                                              39

<PAGE>



shareholders of Columbus.  Following lengthy discussion, the Columbus board
unanimously:

         -      determined that the merger agreement and the merger are in the
                best interests of Columbus and its shareholders;

         -     approved the merger agreement and the merger;

         -     recommended that the shareholders of Columbus adopt the merger
               agreement; and

         -     directed that the merger agreement be submitted for consideration
                by Columbus' shareholders at a special meeting.

         The Key board also met on August 28 to discuss and approve the proposed
merger agreement.

         The merger agreement was executed by both companies on the evening of
August 28, 2000 and thereafter Columbus and Key issued a joint press release
announcing the execution of the merger agreement before the beginning of the
trading day on August 29, 2000.

Reasons for the merger

         Key and Columbus believe that the merger will enable the combined
company, with its larger and more diversified asset base and greater financial
flexibility, to more effectively compete and to achieve certain other strategic
objectives.

         -      Key and Columbus believe the merger will enhance the combined
                company's financial resources and ability to compete for new
                growth opportunities. The oil and gas business is capital
                intensive, often requiring substantial expenditures to gain
                access to mineral rights, acquire geological and geophysical
                data and drill new wells that add proved reserves and
                production. Key and Columbus believe the merger will enhance the
                combined company's borrowing capacity, increase its cash flow
                and improve its access to other capital markets which will
                enable the combined company to increase its investments in new
                exploration and development projects or acquisitions of
                producing properties over those that either company could have
                made separately.

         -      Key and Columbus believe the merger will diversify the combined
                company's asset base. The oil and gas exploration business is
                very competitive and inherently risky. Key has long sought to
                establish a position in south Texas, a prolific gas producing
                area. Columbus' acreage in this region provides Key with a base
                of production and new drilling opportunities from which it can
                potentially expand. Key and Columbus believe Columbus
                shareholders should benefit from Key's growth opportunities in
                the Anadarko Basin of western Oklahoma, the Mississippi Salt
                Basin of southern Louisiana, the Sacramento Basin of northern
                California and the Rocky Mountain region. Greater
                diversification of the combined company's assets and growth
                opportunities may also result in less reliance on any individual
                project for future financial performance.

         -      Key and Columbus believe the merger creates the opportunity for
                meaningful cost-saving opportunities. They expect that the
                merger will result in management and administrative
                efficiencies, primarily from eliminating duplicate functions and
                associated costs. Key expects that the merger will

                                                         40

<PAGE>



                result in approximately $2 million of annual cost savings, which
                will initially be offset by costs related to the merger.

Information and factors considered by the Columbus board; Columbus' reasons for
the merger; Recommendation of the Columbus board.

     Factors considered by the Columbus board. In reaching their decisions to
approve the merger agreement and the merger and to recommend adoption of the
merger agreement by Columbus shareholders, the Columbus board consulted with
Columbus' management and legal and financial advisors and independently
considered the proposed merger agreement and the transactions contemplated by
the merger agreement. In unanimously approving the merger agreement and the
merger, the Columbus board of directors considered a number of factors including
the following:

         -      current industry, market and economic conditions, including the
                ongoing consolidation in the oil and gas industry;

         -      the recent lack of interest by investors in oil and gas
                companies with market capitalization similar to Columbus;

         -      large fluctuations in crude oil and natural gas prices in recent
                years resulting in poor returns on invested capital;

         -      the market price of Columbus common stock over the last several
                years;

         -      the board's belief that Columbus would be unable to raise
                capital in the future without diluting current shareholders;

         -      the interest of Columbus' management in the merger as described
                in "Interests of Certain Executive Officers and Directors in the
                Merger" on page _______.

     Columbus' reasons for the merger. The decision of the Columbus board to
approve the merger agreement and recommend its adoption by Columbus'
shareholders was based upon various factors including those mentioned in
"--Background of the Merger" on page _____, the factors described above and the
following:

         o      the judgment, advice, and analysis of senior management of
                Columbus including, in addition to its favorable recommendation
                of the merger;

         o      that the merger should provide the potential for improved
                trading liquidity to Columbus' shareholders;

         o      the terms of the merger agreement, including the termination
                provisions, closing conditions and the ability of Columbus under
                certain conditions to consider unsolicited alternative business
                combination proposals. See "The Merger Agreement" on page ___,
                "--Conditions to the Merger" on page___, "--Other Acquisition
                Proposals" on page ___ and "--Termination" on page ___;

         o      the process by which senior management with the assistance of AA
                Corporate Finance conducted the merger/sale of Columbus.
                Columbus believes that the search for a suitable acquirer was
                conducted in a manner that identified the potential acquirers
                with the financial ability to consummate the acquisition,
                permitted such

                                                              41

<PAGE>



                potential acquirers sufficient time to conduct due diligence
                reviews of Columbus and submit offers to Columbus, and resulted
                in an increase in the merger consideration offered to Columbus.
                See "--Background" and "Fairness Opinion of Columbus' Financial
                Advisor;"

         o      the fairness opinion of AA Corporate Finance described below, to
                the effect that as of the date of such opinion and based upon
                and subject to certain matters stated therein, the exchange
                ratio pursuant to the merger agreement was fair from a financial
                point of view to the shareholders of Columbus. See "--Fairness
                Opinion of Columbus' Financial Advisor" on page ___;

        o       the market price of Key common stock over the last several years
                and the potential for an increase in the market price in the
                future;

         o      that the merger will be accomplished on a tax-free basis to the
                shareholders for United States federal income tax purposes,
                except for cash received by Columbus shareholders in lieu of
                fractional shares; and

        o       the likelihood that the merger will be completed.

         In reaching its decision to approve the merger and to recommend the
merger to the Columbus shareholders, the Columbus board did not view any single
factor determinative and did not find it necessary or practicable to assign any
relative or specific weights to the various factors considered. Furthermore,
individual directors may have given differing weights to different factors.

         The Columbus board did not specifically adopt AA Corporate Finance's
fairness opinion, but it did rely upon it in reaching its conclusion that the
merger agreement and the merger are in the best interests of Columbus and its
shareholders and considered it an important factor in determining whether to
approve the merger agreement.

         The Columbus board also identified and considered a number of negative
factors in its deliberations concerning the merger, including:

         o      the benefits of Columbus' long-term prospects will be shared by
                former shareholders of Columbus and Key, rather than solely by
                Columbus' existing shareholders;

        o       the difficulty in managing operations in the different
                geographic locations in which Columbus and Key operate; and

        o       the risk that the benefits of the merger might not be fully
                realized.

         However, the Columbus board determined that the detriments were
inherent in proceeding with the merger and were outweighed by the potential
benefits of the merger described above.

         Recommendation of the Columbus Board. The Columbus board unanimously
recommends that the shareholders of Columbus vote FOR adoption of the merger
agreement.




                                                              42

<PAGE>




Fairness Opinion of Columbus' Financial Advisor

         AA Corporate Finance was retained by Columbus to render a fairness
opinion to the board of directors of Columbus as to the fairness of the exchange
ratio pursuant to the merger agreement from a financial point of view to the
shareholders of Columbus. AA Corporate Finance served as Columbus' financial
advisor regarding the sale to Key. AA Corporate Finance is internationally
recognized and is regularly engaged in the valuation of businesses and
securities in connection with mergers and acquisitions, restructurings, private
placements of debt and equity and valuations for corporate and other purposes.
At a meeting of the Columbus board of directors held on August 28, 2000 to
consider the proposed merger, AA Corporate Finance rendered to the Columbus
board an oral and written fairness opinion to the effect that, as of August 28,
2000 and based upon and subject to certain matters stated therein, the exchange
ratio pursuant to the merger agreement was fair from a financial point of view
to the shareholders of Columbus.

         The full text of AA Corporate Finance's written fairness opinion dated
August 28, 2000 to the board of directors of Columbus, which sets forth the
procedures followed, assumptions made, matters considered and limitations on the
review undertaken, is attached as Annex B. Holders of Columbus common stock are
urged to read carefully this opinion in its entirety. AA Corporate Finance's
fairness opinion is addressed to the board of directors of Columbus and relates
only to the fairness of the exchange ratio pursuant to the merger agreement from
a financial point of view, does not address any other aspect of the proposed
merger or any related transaction and does not constitute a recommendation to
any shareholder with respect to any matters relating to the merger. The summary
of the fairness opinion of AA Corporate Finance set forth in this proxy
statement/prospectus is qualified in its entirety by reference to the full text
of the opinion.

         In arriving at its opinion, AA Corporate Finance reviewed the merger
agreement and certain publicly available business and financial information
relating to Columbus and Key. AA Corporate Finance also reviewed certain other
information, including financial forecasts and reserve reports, provided to AA
Corporate Finance by Columbus and Key, and met with the managements of Columbus
and Key to discuss the businesses and prospects of Columbus and Key. AA
Corporate Finance also considered certain financial and stock market data of
Columbus and Key and compared this data with similar data for other publicly
held companies in businesses similar to Columbus and Key and considered, to the
extent publicly available, the financial terms and related stock market data of
certain other business combinations and other transactions recently effected. AA
Corporate Finance compared the estimated net asset values of Columbus and Key
based on estimated values of certain relevant assets and liabilities, and
considered Columbus and Key on a pro forma, combined basis in order to estimate
accretion or dilution to earnings and cash flow per share, and the effects of
cost savings and synergies. AA Corporate Finance compared the relative
contribution of certain operational and financial factors of Columbus and Key to
a combined entity. AA Corporate Finance also considered such other information,
financial studies, analyses and investigations and financial, economic and
market criteria that AA Corporate Finance deemed relevant.

         In connection with its review, AA Corporate Finance did not assume any
responsibility for independent verification of any of the information provided
to or otherwise reviewed by AA Corporate Finance and relied on such information
being complete and accurate in all material respects. With respect to financial
forecasts, AA Corporate Finance assumed that such forecasts were reasonably
prepared by



                                                              43

<PAGE>



management of Columbus and Key on bases reflecting the best currently available
estimates and judgments of the management of Columbus and Key as to the future
financial performance of Columbus and Key and the strategic benefits anticipated
to result from the merger. AA Corporate Finance assumed that the reserve
reports, prepared by Key and Columbus' independent engineers, were reasonably
prepared on bases reflecting the best currently available estimates and
judgments of the preparers of such reports as to the oil and gas reserves of
Columbus and Key. In addition, AA Corporate Finance was not requested to make
and did not make an independent evaluation or appraisal of the assets or
liabilities (contingent or otherwise) of Columbus or Key, nor was AA Corporate
Finance furnished with any such evaluations or appraisals. AA Corporate
Finance's fairness opinion was necessarily based upon information available to,
and financial, economic, market and other conditions as they existed and could
be evaluated by, AA Corporate Finance on the date of its opinion. AA Corporate
Finance did not express any opinion as to the actual value of the Key common
stock when issued pursuant to the merger or the prices at which the Key common
stock will trade subsequent to the merger. Although AA Corporate Finance
evaluated the exchange ratio from a financial point of view, AA Corporate
Finance was not requested to, and did not, recommend the specific consideration
payable in the merger. The exchange ratio was determined through negotiation
between Columbus and Key. AA Corporate Finance did not provide any tax or
accounting advice to Columbus or its shareholders. No other limitations were
imposed on AA Corporate Finance with respect to the investigations made or
procedures followed by AA Corporate Finance in rendering its opinion.

         In preparing its fairness opinion to the board of directors of
Columbus, AA Corporate Finance performed a variety of financial and comparative
analyses, including those described below. The summary of AA Corporate Finance's
analyses set forth below does not purport to be a complete description of the
analyses underlying AA Corporate Finance's fairness opinion. The preparation of
a fairness opinion is a complex analytic process involving various
determinations as to the most appropriate and relevant methods of financial
analyses and the application of those methods to the particular circumstances
and, therefore, such an opinion is not readily susceptible to summary
description. In arriving at its fairness opinion, AA Corporate Finance made
qualitative judgments as to the significance and relevance of each analysis and
factor considered by it. Accordingly, AA Corporate Finance believes that its
analyses must be considered as a whole and that selecting portions of its
analyses and factors, without considering all analyses and factors, could create
a misleading or incomplete view of the processes underlying such analyses and
its opinion. In its analyses, AA Corporate Finance made numerous assumptions
with respect to Columbus, Key, industry performance, regulatory, general
business, economic, market and financial conditions and other matters, many of
which are beyond the control of Columbus and Key. No company, transaction or
business used in such analyses as a comparison is identical to Columbus or Key
or the combined company, nor is an evaluation of the results of such analyses
entirely mathematical; rather such analyses involve complex considerations and
judgments concerning financial and operating characteristics and other factors
that could affect the acquisition, public trading or other values of the
companies, business segments or transactions being analyzed. The estimates
contained in such analyses and the ranges of valuations resulting from any
particular analysis are not necessarily indicative of actual values or
predictive of future results or values, which may be significantly more or less
favorable than those suggested by such analyses. In addition, analyses relating
to the value of businesses or securities do not purport to be appraisals or to
reflect the prices at which businesses or securities actually may be sold.
Accordingly, such analyses and estimates are inherently subject to substantial



                                                              44

<PAGE>



uncertainty. AA Corporate Finance's fairness opinion and financial analyses were
only two of many factors considered by the board of directors of Columbus in its
evaluation of the proposed merger and should not be viewed as determinative of
the views of the board of directors or management of Columbus with respect to
the merger or the exchange ratio.

         The following is a summary of the material analyses performed by AA
Corporate Finance in connection with its fairness opinion dated August 28, 2000.

         Comparable Transactions Analysis - AA Corporate Finance reviewed
certain information from John S. Herold, Inc.'s Herold M&A Transaction Review -
Upstream Analysis on 41 transactions involving Onshore Texas Gulf Coast and
Rocky Mountain exploration and production assets which were announced from
January 1, 1999 to August 25, 2000. As of June 30, 2000, Columbus had
approximately 70% of its proved reserves in the Onshore Texas Gulf Coast region,
and 30% in the Rocky Mountain region. For each transaction, AA Corporate Finance
reviewed a reserve transaction value multiple based on proved oil and gas
reserves. The following summary table presents the weighted average reserve
transaction value multiples:

                                                       $/Mcfe
                                                       -------       Implied
                                       Gulf Coast -       Rocky       Value
                                       Onshore           Mountains   ($/Mcfe)
                                       ------------      ---------   --------
Weighted Avg. (1/1/99-8/25/00)        $0.95             $0.69
Columbus' Total Proved Reserves        70.0%             30.0%
                                      $0.67             $0.21        $0.88

         The implied value of $0.88 total proved Mcfe based on comparable
transactions compares to an implied value of $1.16 total proved Mcfe based on
the merger agreement exchange ratio of 0.355x of the Key closing stock price on
August 25, 2000, and Columbus' SEC Case un-risked total proved reserves as of
June 30, 2000.


         The SEC Case is the pre-tax present value of future net cash flows from
proved reserves, discounted at 10% per year. Oil, gas and NGL prices used to
calculate future revenues are based on June 30, 2000 prices held constant,
except where fixed and determinable price changes are provided by contractual
arrangements. Future development and production costs are also based on year-end
costs and assume the continuation of existing economic conditions.

         However, because the market conditions, rationale and circumstances
surrounding each of the transactions analyzed were specific to each transaction
and because of the inherent differences between the businesses, operations and
prospects of Columbus and Key and the companies involved in the comparable
transactions analyzed, AA Corporate Finance believed that it was not appropriate
to, and therefore did not, rely solely on the quantitative results of the
analysis, and accordingly, also made qualitative judgements concerning
differences between the financial and operating characteristics of the assets of
Columbus and Key and the comparable transaction companies that would affect the
equity values of Columbus and Key.

Contribution Analysis - AA Corporate Finance analyzed the relative production,
revenue, EBITDAX, discretionary cash flow, and net income contributions
(adjusted for non-recurring items) of Columbus and Key to the combined company
based on historical and projected financial and operational data for the years
1999 to 2001 as provided by the companies, assuming no cost savings or
synergies. EBITDAX consists of earnings before interest, taxes, depreciation,
amortization, exploration costs and non-



                                                              45

<PAGE>



recurring items.  The contribution analysis yielded an implied exchange ratio of
0.157x to 0.593x.

Pro Forma Merger Consequences Analysis - AA Corporate Finance evaluated the
potential pro forma effect of the merger on the combined company's estimated
2000 and 2001 earnings per share and cash flow per share based upon financial
forecasts provided by Columbus' and Key's management and after giving effect to
certain cost savings and synergies estimates of management. The conclusion of
the analysis indicated that the proposed merger would be dilutive to Key's per
share earnings and accretive to per share discretionary cash flow for 2001,
assuming that the merger is accounted for as a purchase under generally accepted
accounting principles. The actual results achieved by the combined company may
vary from projected results and the variations may be material.

Net Asset Value (NAV) Analysis - AA Corporate Finance estimated the present
value of the future before-tax cash flows that Columbus could be expected to
generate from its proved reserves, under four oil and gas price scenarios (Case
I, Case II, Case III and Case IV, the Pricing Scenarios), as of June 30, 2000
based on reserve, production and production cost estimates and a range of
discount rates, all as provided by Columbus management and Columbus' independent
engineers, Reed W. Ferrill and Associates, Inc., and as discussed with Key
management. AA Corporate Finance added to such estimated values for proved
reserves assessments of the value of certain other assets, liabilities, and
sources of value of Columbus, including undeveloped acreage, operating and
management services cash flow, cash and outstanding debt. These assessments were
made by AA Corporate Finance based on information provided by Columbus'
management and on various industry benchmarks and assumptions provided by
Columbus' management and discussed with Key's management.

         AA Corporate Finance evaluated the present value of the future
before-tax cash flows that Key could be expected to generate from proved
reserves, under the Pricing Scenarios, as of June 30, 2000 based on reserve,
production and production cost estimates and a range of discount rates, all as
provided by Key management and as discussed with Columbus' management. This
evaluation was net of values for assets and liabilities for undeveloped acreage,
other long-term assets and liabilities, working capital and outstanding debt,
all as provided by the companies and taking into consideration various industry
benchmarks and assumptions provided by Key management and discussed with
Columbus' management.

         Case I oil and gas prices were based on the Nineteenth Annual Society
of Petroleum Evaluation Engineers ("SPEE") Survey of Economic Parameters Used in
Property Evaluation dated June 2000. Adjustments were made by Key and Columbus'
independent engineers to the oil and gas price forecasts to reflect location and
quality differences.

         Case II oil and gas price forecasts in the Pricing Scenarios were based
on NYMEX WTI oil and Henry Hub gas prices as of August 15, 2000. Adjustments
were made by Key and Columbus' independent engineers to the oil and gas price
forecasts to reflect location and quality differentials. Beginning in 2004, the
WTI oil and Henry Hub gas prices for the year 2004 were assumed to escalate at
3% per



                                                              46

<PAGE>



year over the NYMEX WTI and Henry Hub oil and gas prices for the prior year.

         Case III oil and gas price forecasts in the Pricing Scenarios were
based on the Third Quarter, 2000 Randall & Dewey, Inc. Acquisitions Review
Industry Group price survey. Adjustments were made by Key and Columbus'
independent engineers to the oil and gas price forecasts to reflect location and
quality differences.

         Case IV oil and gas price forecasts in the Pricing Scenarios were based
on the July 2000 Madison Energy Advisors, Inc. Quarterly Pricing Poll.
Adjustments were made by Key and Columbus' independent engineers to the oil and
gas price forecasts to reflect location and quality differences.

              The NAV analysis resulted in implied exchange ratio range of
0.338x to 0.514x.

Premiums Paid Analysis - AA Corporate Finance calculated the implied premium (or
discount) being paid in the merger based on the exchange ratio of 0.355x Key
common shares for each Columbus common share, the August 25, 2000 closing price
of Key common shares and the price of Columbus common shares on certain dates.
AA Corporate Finance compared these results to 14 other selected mergers and
acquisitions in the oil and gas industry since 1995 involving publicly traded
target companies. Premiums (or discounts) paid were calculated using the per
share value of the consideration paid by the acquirer to the shareholders of the
target companies (closing price as of the day prior to the announcement date if
a stock for stock exchange.) The following table presents the premium (or
discount) paid in the selected transactions as compared to the merger:
<TABLE>
<CAPTION>

                                                Prior to Announcement
                                                                                   52-Week
                            1 Day   7 days   30 Days   60 Days     90 Days   1-Year  High
--------------------------------------------------------------------------------------------
<S>                        <C>      <C>     <C>        <C>           <C>     <C>   <C>
Key Production/Columbus    (4.9%)   (2.1%)  (1.2%)     (8.3%)        9.6%    7.3%  (11.6%)

Selected Transactions
Average                    14.8%    17.8%   23.5%      25.4%        32.8%   20.9%  (14.7%)
High                       38.1%    41.3%   63.0%      83.0%        95.2%   91.3%   24.1%
Low                        (9.5%)   (9.5%)  (3.2%)    (37.3%)      (51.1%) (79.9%) (80.5%)
</TABLE>

The average premium (or discount) paid in the selected transactions was applied
to the respective historical stock prices of Columbus and resulted in an implied
exchange ratio of 0.343x to 0.486x.

Stock Price Ratio History Analysis - AA Corporate Finance reviewed the daily
historical closing prices of the common stock of Columbus and Key for the period
from August 28, 1999 to August 25, 2000. AA Corporate Finance analyzed the ratio
of the August 25, 2000 closing share price for Columbus to the corresponding
closing share price of Key. In addition, AA Corporate Finance reviewed the ratio
of average closing share prices for Columbus and Key for periods 7-days,
30-days, 60-days and 90-days prior to August 28, 2000. AA Corporate Finance also
reviewed the ratio of Columbus' and Key's 52-week high common share price prior
to August 28, 2000.

                                                       (KP:EGY)
                                                  Implied Historical
                                                  Exchange Ratio
1 Day Prior to August 28, 2000                       0.373x

Average Stock Price Ratio

7 Days Prior to August 28, 2000                      0.366x
30 Days Prior to August 28, 2000                     0.396x
60 Days Prior to August 28, 2000                     0.400x
90 Days Prior to August 28, 2000                     0.405x

Ratio of Stock Price 52-Week High                    0.365x

The stock price ratio history analysis implied an exchange ratio range of 0.365x
to 0.405x.

Comparable Company Trading Analysis - With respect to Columbus, AA Corporate
Finance reviewed the public stock market trading multiples for selected
comparable exploration and production companies. Using publicly available
information, AA Corporate Finance calculated and analyzed the common equity
market value multiples of certain historical and projected financial results
(such as net income and discretionary cash flow, adjusted for non-recurring
items) and the adjusted enterprise value multiples of certain historical and
projected financial results (such as EBITDA (as defined below) and quantity of
proved oil and gas reserves). EBITDA consists of earnings before interest,
taxes, depreciation and amortization. The adjusted enterprise value of each
company was obtained by adding long-term debt to the sum of the market value of
its common equity, the value of its preferred stock (market value if publicly
traded, conversion value, liquidation value, or book value if not) and the book
value of any minority interests minus the cash balance.

         With respect to Key, AA Corporate Finance reviewed the public stock
market trading multiples for selected exploration and production companies.
Using publicly available information, AA Corporate Finance calculated and
analyzed the common equity market value multiples of certain historical and
projected financial results (such as net income and discretionary cash flow,
adjusted for non-recurring items) and the adjusted enterprise value multiples of
certain historical and projected financial results (such as EBITDA and quantity
of proved oil and gas reserves). The adjusted enterprise value of each company
was obtained by adding long-term debt to the sum of the market value of its
common equity, the value of its preferred stock (market value if publicly
traded, conversion value, liquidation value, or book value if not) and the book
value of any minority interests minus the cash balance.

         Because of the inherent differences between the businesses, operations
and prospects of Columbus and Key and the businesses, operations and prospects
of the companies included in the comparable company groups, AA Corporate Finance
believed that it was inappropriate to, and therefore did not, rely solely on the
quantitative results of the analysis, and accordingly, also made qualitative
judgements concerning differences between the financial and operating
characteristics of Columbus and Key and companies in the comparable company
groups that would affect the public trading values of Columbus and Key and such
comparable companies.

         Miscellaneous - Pursuant to the terms of AA Corporate Finance's
engagement, AA Corporate Finance received a fee for its services in connection
with the delivery of its fairness opinion. Columbus also has agreed to reimburse
AA Corporate Finance for reasonable out-of-pocket expenses incurred by AA
Corporate Finance in performing its services, including reasonable fees and
expenses for legal counsel and any other advisor retained by AA Corporate
Finance, and to indemnify AA Corporate Finance and



                                                              48

<PAGE>



certain related persons and entities against certain liabilities under the
federal securities laws arising out of AA Corporate Finance's engagement. AA
Corporate Finance is continuing to provide financial advisory services to
Columbus with respect to the merger and received a fee for its services.



                                                              49

<PAGE>




                              The Merger Agreement

         This section describes various material provisions of the merger
agreement. Because the description of the merger agreement contained in this
proxy statement/prospectus is a summary, it does not contain all the information
that may be important to you. You should read carefully the entire agreement and
plan of merger attached as Annex A to this proxy statement/prospectus before you
decide how to vote.

General

         As of the effective time of the merger, two things will happen:

    - First, Key Acquisition Two, Inc., a newly formed Colorado corporation,
wholly owned by Key, will be merged into Columbus. Columbus will continue as the
surviving corporation and will become a wholly owned subsidiary of Key.

    - Second, the outstanding shares of Columbus common stock will be converted
into shares of Key common stock, based on the exchange ratio.

         The articles of incorporation of Columbus will be the articles of
incorporation of the surviving corporation. The directors and officers of Key
Acquisition Two, Inc. will be the directors and officers of the surviving
corporation.

Closing of the merger; effective time of the merger

         Closing of the merger. Unless Key and Columbus agree otherwise, the
merger will close as soon as practicable (but in any event within two business
days) after the date on which all closing conditions have been satisfied or
waived. We expect the closing to take place after the shareholders of Columbus
approve the merger at its special meeting of shareholders.

         Effective time of the merger. At the closing of the merger, Key and
Columbus will file articles of merger with the Colorado Secretary of State.
Unless Key and Columbus agree otherwise, the merger will become effective at the
time the certificate is filed.

Consideration to be received in the merger

         In the merger, without any action on the part of the Columbus
shareholders, the issued and outstanding shares of Columbus capital stock will
be treated as follows:

     o   each outstanding share of Columbus common stock will be converted into
         0.355 shares of Key common stock;

     o   each share of Columbus common stock owned or held by Key or Columbus or
         their wholly owned subsidiaries, including treasury stock, will be
         canceled and retired;

     o   each option to purchase shares of Columbus Common Stock that is
         outstanding immediately prior to the closing shall be converted into a
         fully vested option to purchase 0.355 shares of Key common stock for
         each Columbus share covered by the option. The converted options will
         be on the same terms, except that they will be exercisable for only 12
         months after closing and any Columbus options



                                                              50

<PAGE>



         that are incentive stock options may cease being incentive stock
         options as a result of the conversion. Key will use its best efforts to
         cause the exercise of the options to be registered on Form S-8 prior to
         the time that the exercise price of the options is less than the market
         price of the stock covered by the options.

Exchange of shares; fractional shares

         Exchange agent. Prior to the merger, Key will appoint Continental Stock
Transfer & Trust Company of New York to exchange the certificates representing
shares of Columbus common stock for certificates representing shares of Key
common stock and the cash to be paid in lieu of fractional shares of Key common
stock. Key will deposit, for the benefit of holders of Columbus common stock,
certificates representing Key common stock with the exchange agent for
conversion of shares as described below.

         Exchange Agent; Exchange of shares. Promptly after the merger, the
exchange agent will mail to each holder of certificates representing Columbus
common stock a transmittal letter and instructions explaining how to surrender
their certificates to the exchange agent.

         Columbus shareholders who surrender their stock certificates to the
exchange agent, together with a properly completed and signed transmittal letter
and any other documents required by the instructions to the transmittal letter,
will receive Key common stock certificates representing the number of shares
that each holder is entitled to in accordance with the exchange ratio, with a
check representing the amount of cash being paid in lieu of fractional shares of
Key common stock. Holders of unexchanged Columbus stock certificates will not
receive any dividends or other distributions made by Key after the merger until
their stock certificates are surrendered. Upon surrender, subject to applicable
laws, those holders will receive all dividends and distributions made subsequent
to the merger (with a record date also subsequent to the merger) and prior to
surrender on the related shares of Key common stock, less the amount of any
withholding taxes, together with a check representing the amount of cash in lieu
of fractional shares of Key common stock, in each case without interest. Any
shares of Key common stock to be issued in the merger or funds set aside by Key
to pay cash in lieu of fractional shares in connection with the merger or to pay
dividends or other distributions on shares of Key common stock to be issued in
the merger that are not claimed within one year after the merger will be
delivered to Key. Thereafter, Key will act as the exchange agent and former
shareholders of Columbus may look only to Key for payment of their shares of Key
common stock, cash in lieu of fractional shares and unpaid dividends and
distributions. Key will not be liable to any former holder of Columbus common
stock for any amount properly delivered to a public official pursuant to
applicable abandoned property, escheat or similar laws.

         Columbus stock certificates should not be returned with the enclosed
proxy card. A transmittal letter and accompanying instructions will be provided
to Columbus shareholders following the merger.

         Fractional shares. No fractional shares of Key common stock will be
issued to holders of Columbus common stock. In lieu of fractional shares, each
holder of shares of Columbus common stock otherwise entitled to a fractional
amount will receive by cash, check or other form of payment an amount
representing the fractional amount multiplied by the closing sales price of Key
common stock as reported on the New York Stock Exchange for the effective date
of the merger (or, if there is no trading



                                                              51

<PAGE>



activity in Key common stock on the New York Stock Exchange on that date, the
first date of trading of Key common stock on the New York Stock Exchange after
the effective date of the merger).

         Key will deposit the necessary cash with the exchange agent to forward
to holders in lieu of fractional shares of Key common stock.

Conditions to the merger

         Conditions to each company's obligation to effect the merger. The
obligations of Key and Columbus to complete the merger are subject to a number
of conditions, including the following, unless waived:

   -    approval by Columbus' shareholders;

   -    the absence of any law or court order prohibiting the merger;

   -    the approval for listing on the New York Stock Exchange of the Key
        shares to be issued in the merger;

   -    there must not be a material adverse change in either party's business
        or financial condition;

   -    the continued accuracy of each company's representations and warranties
        and the compliance by each company with its covenants and agreements
        contained in the merger agreement; and

   -    the receipt of a legal opinion from counsel for Columbus as to the
        tax-free qualification of the merger.

         The board of directors of either Key or Columbus may choose to complete
the merger even though a condition to that company's obligation has not been
satisfied if the Columbus shareholders have approved the merger and the law
allows the board to do so.

Representations and warranties

         The merger agreement contains representations and warranties by Key and
Columbus as to themselves and their subsidiaries concerning, among other things:

    - organization, standing and authority;

    - corporate authorization to enter into the merger and related transactions;

    - capital structure;

    - significant subsidiaries;

    - the absence of defaults caused by execution of the merger agreement;

    - compliance with agreements, court orders and laws;

    - accuracy of financial statements and reports filed with the SEC;

    - the absence of material litigation;



                                                              52

<PAGE>




    - the absence of certain changes or events;

    - tax matters;

    - employee benefits and labor matters;

    - the absence of violations or liabilities under environmental laws;

    - good title to properties;

    - futures or options trading;

    - insurance matters;

    - material contracts;

    - fees of financial advisors and others;  and

    - receipt of Columbus' financial advisor's fairness opinion.

Certain covenants

    Operating covenants. Prior to the merger, each of Key and Columbus agreed to
conduct its operations in the ordinary course in substantially the same manner
as previously conducted and to use reasonable efforts to preserve substantially
intact its business organization and keep available the services of its
respective officers and maintain satisfactory relationships with its material
customers and suppliers and maintain its assets and insurance.

         With certain exceptions, the merger agreement places specific
restrictions on the ability of Key to, among other things:

    -    pay dividends or redeem capital stock or split, combine or reclassify
         any capital stock or any other securities in substitution for capital
         stock;

    -    take any action which would result in a failure to maintain the trading
         of Key's common stock on the New York Stock Exchange;

    -    adopt any amendments to its charter or bylaws;

         With certain exceptions, the merger agreement places specific
restrictions on the ability of Columbus to, among other things:

    -    pay dividends or redeem capital stock or split, combine or reclassify
         any capital stock or any other securities in substitution for capital
         stock;

    -    adopt any amendments to its charter or bylaws;

    -    increase the compensation or benefits of any director or executive
         officer

    -    except for outstanding options, issue capital stock or amend or
         accelerate options;

    -    acquire businesses or entities without the consent of the other party;



                                                              53

<PAGE>




    -    dispose of material assets, except for dispositions of oil and gas
         production in the ordinary course of business and consistent with past
         practice and except for the sale of limited amounts of oil and gas
         properties;

    -    except as may be required by a change in law or in generally accepted
         accounting practices, change any of its accounting methods or make or
         rescind tax elections;

    -    borrow money, except in the ordinary course of business consistent with
         past practice and in no event in excess of $100,000 in the aggregate;

    -    enter into any material contract that provides for an exclusive
         arrangement with that third party or is substantially more restrictive
         on Columbus or substantially less advantageous to Columbus than present
         contracts; or

    -    approve authorizations for expenditures or agreements to acquire
         property in excess of $30,000;

    The merger agreement contains additional agreements relating to, among other
things:

    -    the preparation, filing and distribution of this document and Key's
         filing of the registration statement on Form S-4 of which this document
         is a part;

    -    the recommendation of the merger by Columbus' board of directors to its
         shareholders;

    -    convening and holding the Columbus shareholders meeting;

    -    access to information;

    -    public announcements;

    -    mutual notification of specified matters;

    -    indemnification of Columbus' officers and directors;

    -    agreements as to certain employee benefits matters; and

    -    absence of actions or omissions that would result in the merger not
         qualifying as a reorganization under Section 368(a) of the Internal
         Revenue Code.

AA Corporate Finance fairness opinion update

At any time up to 10 days prior to the date of the Columbus shareholders
meeting, either Columbus or Key may request that AA Corporate Finance update its
fairness opinion to the board of directors of Columbus that the exchange ratio
pursuant to the merger agreement is fair from a financial point of view to the
shareholders of Columbus. Columbus will pay the fee for the update.

Other acquisition proposals

Columbus has agreed that it will not initiate, solicit or encourage any proposal
relating to a merger, business combination, sale of 20% of the assets of
Columbus or



                                                             54

<PAGE>



acquisition of 20% of the outstanding Columbus stock, and Columbus will promptly
notify Key of all relevant terms of any proposals Columbus receives.

The board of directors of Columbus may nevertheless negotiate with any person in
an unsolicited bona fide proposal in writing, and may withdraw its
recommendation of the Key merger, if the board determines that the proposal is
materially more favorable to the shareholders of Columbus.

    As described further in the next two sections, Columbus has the right to
terminate the merger agreement in order to accept a superior acquisition
proposal, subject to the payment of a termination fee and expenses. See
"--Termination Fees and Expenses" on page __.

Termination

Prior to the merger, the merger agreement may be terminated:

    - by mutual written consent of Key and Columbus;

    - by either Key or Columbus if:

    -  certain material breaches of covenants or representations in the merger
       agreement by the other party;

    -  a court or other governmental authority permanently prohibits the merger;

    -  the merger is not completed by December 31, 2000, subject to extension to
       March 31, 2001 if regulatory approvals are not received;

    -  the Columbus shareholders fail to give the required approvals; or

    -  the board of directors of Columbus withdraws its recommendation that
       the Columbus shareholders approve the merger if there exists at such
       time a competing transaction or if the board recommends approval of a
       competing transaction;

    - by Columbus if:

    -      Columbus' investment adviser is requested to deliver an updated
           fairness opinion to the board of directors of Columbus that the
           exchange ratio pursuant to the merger agreement is fair from a
           financial point of view to the shareholders of Columbus, and fails to
           do so;

    - by Key if:

    -           the Columbus board of directors withdraws or changes its
                recommendation of the merger or recommends to the Columbus
                shareholders a competing transaction;

    -           a tender offer for 20% or more of the outstanding shares of
                capital stock of Columbus is commenced and the Columbus board
                does not recommend against it; or

    -           any person or group acquires or has the right to acquire
                beneficial ownership of 20% or more of Columbus' stock.



                                                             55

<PAGE>




Termination fees and expenses

If Key terminates the merger agreement upon any of the following events, then
Columbus must pay to Key a fee of $1,000,000:

    -           Columbus has willfully breached any representation or agreement
                and has initiated, solicited or encouraged a competing
                transaction that occurs or is agreed upon within 12 months after
                the date of termination;

    -           the Columbus shareholders do not approve the merger and at the
                time of the shareholder meeting a competing transaction has been
                proposed; or

    -           Columbus' board withdraws its recommendation of the Key merger
                and at the time of the termination a competing transaction has
                been proposed; or

    -           a tender offer for 20% or more of the outstanding shares of
                capital stock of Columbus is commenced and the Columbus board
                does not recommend against it; or

    -           any person or group acquires or has the right to acquire
                beneficial ownership of 20% or more of Columbus' stock; or

    -           AA Corporate Finance is requested to deliver an updated fairness
                opinion to the board of directors of Columbus that the exchange
                ratio pursuant to the merger agreement is fair from a financial
                point of view to the shareholders of Columbus, and fails to
                deliver the updated fairness opinion and at the time of the
                termination a competing transaction has been proposed.

If Key terminates the merger agreement upon either of the following events, then
Columbus must pay to Key its out-of-pocket expenses incurred in connection with
the merger:

    -           the Columbus shareholders do not approve the merger and at the
                time of the shareholder meeting no competing transaction has
                been proposed; or

    -           AA Corporate Finance is requested to deliver an updated fairness
                opinion to the board of directors of Columbus that the exchange
                ratio is fair from a financial point of view to the shareholders
                of Columbus and fails to do so and at the time of the
                shareholder meeting no competing transaction has been proposed.

If Columbus terminates the merger agreement upon a willful breach of any
representation or agreement of Key, then Key must pay to Columbus a fee of
$1,000,000.

    Merger costs. Columbus expects to incur approximately $800,000 of
nonrecurring business combination costs, primarily related to financial advisor
expenses, severance, legal and accounting fees, financial printing expenses and
other related charges.

    Other expenses. All costs and expenses incurred in connection with the
merger agreement and related transactions will be paid by the party incurring
them, except that printing and mailing costs will be shared one-third by
Columbus and two-thirds by Key, and termination fees and expenses will be paid
as provided above in "--Termination Fees and Expenses" on page __.



                                                             56

<PAGE>




Amendment; extension and waiver

    Amendment. Subject to the next sentence, the merger agreement may be amended
at any time with the consent of the Key board and the Columbus board. If the
merger agreement has been approved by the Columbus shareholders, then it cannot
be amended subsequently without obtaining any further shareholder approval
required by law.

    Extension and waiver. At any time prior to the completion of the merger,
each of Key and Columbus may, to the extent permitted by law, grant the other
party additional time to perform its obligations under the merger agreement, may
waive any inaccuracies in the representations and warranties of the other party
and may waive compliance with any agreements or conditions for the benefit of
that party.

Stock exchange listing

Key has agreed to use all reasonable efforts to cause the shares of Key common
stock to be issued in the merger to be approved for listing on the New York
Stock Exchange prior to the closing.

Regulatory Approval

         No federal or state regulatory requirements must be complied with or
approval obtained in connection with the merger.

Accounting Treatment

         The merger will be accounted for under the "purchase" method of
accounting. This means that Key will record the excess of the purchase price of
Columbus over the fair market value of Columbus' assets as goodwill.

No Appraisal Rights

         Holders of Columbus common stock are not entitled to dissenters'
appraisal rights under Colorado law in connection with the merger because the
Columbus common stock was listed on the American Stock Exchange on the record
date for the special meeting.





                                                             57

<PAGE>
             Information Regarding Directors, Executive Officers and
                            Five Percent Shareholders

         The board of directors and officers of the combined company will
consist of the current directors and officers of Key. Information about Key's
officers and directors can be found in its 1999 Form 10-K and proxy statement
for its 2000 annual meeting that are incorporated by reference in this proxy
statement/prospectus. See "Where You Can Find More Information" on page __. The
combined company may determine to offer employment to some Columbus employees.

         Information concerning directors and officers of Columbus, executive
compensation and ownership of Columbus common stock by management and principal
shareholders of Columbus is contained in Columbus' proxy statement dated March
27, 2000 that is incorporated by reference in this proxy statement/prospectus.
See "Where You Can Find More Information" on page __.


                     Interests of Certain Executive Officers
                           and Directors in The Merger

         When considering the recommendation of the Columbus board of directors,
you should be aware that some of Columbus' directors and executive officers have
interests in the merger that are different from your interests.

         All directors and executive officers hold options to purchase shares of
Columbus common stock, which are fully vested and exercisable. These options
will be assumed by Key and converted into options to purchase a number of shares
of Key common stock determined by multiplying the number of shares of Columbus
common stock subject to the option by .355 rounded to the nearest whole number
of shares. The per share exercise price of the Key common stock options will be
equal to the exercise price per share of the Columbus common stock option
divided by .355, rounded to the nearest one-hundredth cent. The options will be
exercisable for a period of 12 months after the effective date of the merger.
The terms and conditions of each option will remain the same as they were prior
to the effective time of the merger, except for the exercise period and except
that all options will become non-qualified options.

         The following table sets forth information concerning individual grants
of stock options to Columbus' executive officers and directors which will be
converted into Key stock options at the effective date:
<TABLE>
<CAPTION>
                                                                               Exercise
                                                                Number of    Price
         Name                       Title                    Columbus Shares ($/Share)
         ----                       -----                    --------------------------
<S>                        <C>                                <C>              <C>
 Harry A. Trueblood, Jr.   Chairman of the Board,             50,000           $6.125
                            President and Chief               32,000            7.00
                            Executive Officer

 Clarence H. Brown         Director, Executive Vice            26,620          6.1233
                            President and Chief Operating      20,000          6.125
                            Officer                            20,000          7.00

J. Samuel Butler           Director                            12,000          6.125

William H. Blount, Jr.     Director                            12,000          6.125

Jerol M. Sonosky           Director                            12,000          6.125

 Ronald H. Beck            Vice President and Chief            16,000          6.125
                            Financial Officer                  13,000          7.00

 Michael M. Logan          Vice President of Corporate         16,000          6.125
                            Development and Marketing          13,000          7.00
                            and Corporate Secretary

 James P. Garrett          Treasurer                            9,983          6.1233
                                                               12,000          6.125
                                                               10,400          7.00
</TABLE>
                                                             58

<PAGE>

         Columbus has a separation pay policy that provides for payments to
officers and employees who are terminated within six months after a change of
control of Columbus. The merger will constitute a change in control under this
policy. An officer with more than 36 months of service will receive three months
salary plus an additional three weeks of pay for each full year of service. All
officers have more than 36 months of service. The severance pay rate will be
calculated on the basis of the average weekly salary received during the 52
weeks immediately preceding such termination. The following table shows the
amounts that may be received by Columbus' executive officers as of August 31,
2000 under this policy:

                  Harry A. Trueblood        $168,205
                  Clarence H. Brown         $122,500
                  Michael M. Logan          $123,436
                  Ronald H. Beck            $123,436
                  James P. Garrett          $ 64,513



With respect to Messrs. Trueblood and Brown, the amounts in the table above have
been approved by the board and accrued in Columbus' historical financial
statements and will be paid upon retirement from Columbus even if the merger is
not completed.

            Material United States Federal Income Tax Considerations

         The following discussion is a summary of the material United States
federal income tax consequences of the merger to a shareholder of Columbus
holding shares of Columbus common stock as a capital asset within the meaning of
Section 1221 of the Internal Revenue Code at the effective time of the merger.

         This discussion does not address all aspects of federal taxation that
may be relevant to particular shareholders of Columbus in light of their
personal circumstances or to shareholders of Columbus subject to special
treatment under the Internal Revenue Code, including, without limitation,
financial institutions or trusts; tax-exempt entities; insurance companies;
traders that mark to market; dealers in securities or foreign currencies;
shareholders who received their Columbus stock through an exercise of employee
stock options or otherwise as compensation; shareholders who are foreign
corporations, foreign partnerships, or other foreign entities, or individuals
who are not citizens or residents of the



                                                             59

<PAGE>
U.S.; and shareholders who hold Columbus stock as part of a hedge, straddle or
conversion transaction. We have not described tax consequences that we assume to
be generally known by investors. In addition, the discussion does not address
any state, local or foreign tax consequences of the merger. Finally, the tax
consequences to holders of stock options or restricted stock are not discussed.

         This discussion is based on the Internal Revenue Code, the United
States Department of Treasury regulations and administrative rulings and
judicial decisions all as in effect as of the date of this joint proxy
statement/prospectus, all of which are subject to change, possibly with
retroactive effects, and which are subject to differing interpretations. No
ruling has been or will be sought from the IRS concerning the tax consequences
of the merger. Columbus shareholders are urged to consult their tax advisors
regarding the tax consequences of the merger to them, including the effects of
United States federal, state, local, foreign and other tax laws.

         Tax Consequences of the Merger. The obligation of Columbus to
consummate the merger is subject to the condition, which may be waived, that
Columbus receive a legal opinion from Sherman & Howard L.L.C. to the effect that
the merger will qualify as a reorganization within the meaning of Section 368(a)
of the Internal Revenue Code, subject to the assumptions, limitations,
qualifications and other considerations described below under "--Considerations
with Respect to Opinions."
Under such treatment,

        o         Columbus will not recognize any gain or loss on the merger;

         o        no gain or loss will be recognized by a Columbus shareholder
                  as a result of the receipt solely of shares of Key common
                  stock pursuant to the merger, except to the extent of any cash
                  received in lieu of fractional shares of Key common stock;

         o        a Columbus shareholder who receives cash in lieu of a
                  fractional share of Key common stock will be treated as if the
                  shareholder received the fractional share and then sold the
                  share back to Key. The shareholder will in general recognize
                  gain or loss on the sale of the fractional share equal to the
                  difference between (a) the amount of cash received for the
                  fractional share and (b) the shareholder's tax basis in the
                  fractional share;

         o        a Columbus shareholder's aggregate tax basis in the Key common
                  stock received pursuant to the merger will initially be (a)
                  equal to the shareholder's aggregate tax basis in that
                  shareholder's Columbus common stock immediately prior to the
                  merger (b) reduced by the amount of basis allocable to the
                  fractional share, as described above.

         o        a Columbus shareholder's holding period for Key common stock
                  received in exchange for Columbus common stock pursuant to the
                  merger will include the holding periods of that shareholder's
                  Columbus common stock surrendered in the merger; and

         o        Columbus shareholders must retain records and file a statement
                  setting forth facts pertinent to the merger with their United
                  States federal income tax returns, including a statement of
                  the cost or other basis of their Columbus common stock
                  transferred pursuant to the merger and a statement in full of
                  the amount of stock and other property or money received in
                  the merger.



                                                             60

<PAGE>
         Considerations with Respect to Opinions. The tax opinion of Sherman &
Howard L.L.C. and the foregoing summary of the U.S. federal income tax
consequences of the merger are and will be subject to assumptions, limitations
and qualifications and are based on current law and, among other things,
representations of Columbus and Key, including representations made by the
respective managements of Columbus and Key. An opinion of counsel is not binding
on the IRS and does not preclude the IRS from adopting a contrary position. In
addition, if any of the representations or assumptions are inconsistent with the
actual facts, the U.S. federal income tax consequences of the merger could be
adversely affected.

         Unless you comply with certain reporting and/or certification
procedures or are an exempt recipient under applicable provisions of the
Internal Revenue Code and Treasury regulations, cash payments in exchange for
your Columbus common shares in the merger may be subject to "backup withholding"
at a rate of 31% for federal income tax purposes. Any amounts withheld under the
backup withholding rules may be allowed a refund or credit against the holder's
federal income tax liability, provided the required information is furnished to
the IRS.

         Non-U.S. Shareholders. Because Columbus will likely be considered a
"United States real property holding corporation" under Section 897 of the Code,
foreign shareholders of Columbus (including non-resident alien individuals,
foreign corporations, partnerships with foreign partners, and certain other
foreign persons) generally will be taxable (at rates and in the manner
applicable to United States citizens and domestic corporations) upon the receipt
of the Key common stock and cash those shareholders receive in the exchange.
Furthermore, Key generally will be required to withhold 10% (and in certain
circumstances up to 35%) of the amount of such consideration paid to such
foreign shareholders. The amount withheld can be credited against the amount of
tax that is due upon the exchange. As noted above, however, this discussion does
not purport to describe all of the tax consequences for foreign shareholders
that may arise upon the exchange, and therefore such shareholders are strongly
urged to consult their tax advisors with respect to these matters.

         This discussion is only a general summary of the material federal
income tax consequences of the merger. The tax consequences of the merger to you
may be different from those summarized above, based on your individual
situation. Accordingly, Columbus shareholders are strongly urged to consult with
their tax advisors with respect to the particular United States federal, state,
local or foreign and other applicable tax laws and the effect of any proposed
changes in the tax laws or other tax consequences of the merger to them.




                                                             61

<PAGE>
                        Comparison of Shareholder Rights

         Columbus is a Colorado corporation and the rights of its shareholders
are covered by the Colorado Business Corporation Act (CBCA) and the articles of
incorporation and bylaws of Columbus. Key is a Delaware corporation and the
rights of its stockholders are governed by the Delaware General Corporation Law
(DGCL) and the certificate of incorporation and bylaws of Key. By the merger
agreement, the Columbus shareholders will become Key stockholders and as such
their rights will be governed by the DGCL and the Key certificate of
incorporation and bylaws.

  Significant Differences Between the Corporation Laws of Colorado and Delaware

         The corporation laws of Colorado and Delaware differ in many respects.
Although all the differences are not set forth in this document, provisions that
could materially affect the rights of shareholders are discussed below.

         Indemnification and Limitation of Liability

         Delaware and Colorado have similar laws respecting indemnification by a
corporation of its officers, directors, employees and other agents. The laws of
both states also permit, with certain exceptions, a corporation to adopt a
provision in its articles of incorporation or certificate of incorporation, as
the case may be, eliminating the liability of a director to the corporation or
its stockholders for monetary damages for breach of the director's fiduciary
duty. There are, nonetheless, differences between the laws of the two states
respecting indemnification and limitation of liability.

                           Colorado

The articles of incorporation of Columbus eliminate the
liability of directors of the corporation to the fullest
extent permissible under Colorado law.  Colorado law
prohibits the elimination of monetary liability where such
liability is based on:

   o breaches of the director's duty of loyalty
     to the corporation or its shareholders,

   o acts or omissions not in good faith or
     involving intentional misconduct or
     knowing violations of law,

   o in the case of conduct in an official
     capacity with the corporation, acts
     or omissions not in the best interest
     of the corporation, and in all other
     cases acts or omissions contrary to the
     best interests of the corporation,

   o receipt of an improper personal benefit,

   o liability for improper distributions, loans
     or guarantees.

Colorado law generally permits indemnification of director
expenses, including attorneys' fees, actually and reasonably
incurred in the defense or settlement of a derivative or
third-party action, provided there is a determination by a
majority vote of a disinterested quorum of the directors, by
independent legal counsel or by a majority vote of the
shareholders that the person seeking indemnification acted in
good faith and in a manner reasonably believed to be in the
best interests of the corporation.  Colorado law requires
indemnification of director expenses when the individual
being indemnified has successfully defended any action,
claim, or issue on the merits or otherwise.

                                                             62

<PAGE>
                           Delaware

The certificate of incorporation of Key also eliminates the
liability of directors to the corporation or its stockholders
for monetary damages for breach of fiduciary duty as a
director to the fullest extent permissible under Delaware
law.  Under Delaware law, such provision may not eliminate or
limit director monetary liability for:

   breaches of the director's duty of loyalty to the
corporation or its stockholders,

   o  acts or omissions not in good faith or involving
      intentional misconduct or knowing violations of  law,

   o  the payment of unlawful dividends or unlawful stock
      repurchases or redemptions, or

   o  transactions in which the director received an improper
      personal benefit.

Such limitation of liability provisions also may not limit a
director's liability for violation of or otherwise relieve
directors from the necessity of complying with federal or
state securities laws, or affect the availability of
non-monetary remedies such as injunctive relief or rescission.

Delaware law generally permits indemnification of expenses,
including attorneys' fees, actually and reasonably incurred
in the defense or settlement of a derivative or third-party
action, provided there is a determination by a majority vote
of disinterested directors, by independent legal counsel or
by a majority vote of the stockholders that the person
seeking indemnification acted in good faith and in a manner
reasonably believed to be in or not opposed to the best
interest of the corporation.  Delaware law requires
indemnification of expenses when the individual being
indemnified has successfully defended any action, claim,
issue or matter therein, on the merits or otherwise.

Delaware law also permits a Delaware corporation to provide
indemnification in excess of that provided by statute.

A provision of Delaware law states that the indemnification
provided by statute shall not be deemed exclusive of any
other rights under any bylaw, agreement, vote of stockholders
or disinterested directors or otherwise.

         Both Colorado and Delaware law require indemnification when the
individual has defended successfully the action on the merits or otherwise.

         Expenses incurred by an officer or director in defending an action may
be paid in advance, under Colorado law and Delaware law, if such director or
officer undertakes to repay such amounts if it is ultimately determined that he
or she is not entitled to indemnification. In addition, the laws of both states
authorize a corporation's purchase of indemnity insurance for the benefit of its
officers, directors, employees and agents whether or not the corporation would
have the power to indemnify against the liability covered by the policy.




                                                             63

<PAGE>
         Inspection of Shareholder List

         Both Delaware and Colorado law allow any shareholder to inspect the
shareholder list for a purpose reasonably related to such person's interests as
a shareholder.

         Dividends and Repurchases of Shares

                           Colorado

Colorado law dispenses with the concepts
of par value of shares as well as
statutory definitions of capital,
surplus and the like.  The concepts of
par value, capital and surplus are
retained under Delaware law.  Colorado
law permits a corporation to declare and
pay dividends unless, after giving it
effect:

   -     the corporation would not be able
         to pay its debts as they become
         due in the usual course of
         business, or

   -     the corporation's total assets
         would be less than the sum of its
         total liabilities plus, unless the
         articles of incorporation permit
         otherwise, the amount that would
         be needed, if the corporation were
         to be dissolved at the time of the
         distribution, to satisfy the
         preferential rights that are
         superior to those  receiving the
         distribution.

                  Delaware

Delaware law permits a corporation to
declare and pay dividends out of surplus
or if there is not surplus, out of net
profits for the fiscal year as long as
the amount of capital of the corporation
following the declaration and payment of
the dividend is not less than the
aggregate amount of the capital
represented by the issued and
outstanding stock of all classes having
preference upon the distribution of
assets.  In addition, Delaware law
generally provides that a corporation
may redeem or repurchase its shares only
if the capital of the corporation is not
impaired and such redemption or
repurchase would not impair the capital
of the corporation.

                                                             64

<PAGE>

        Shareholder Voting

              Colorado

Generally requires that a majority of
the shareholders of both acquiring and
target corporations approve statutory
mergers.  Does not require a shareholder
vote of the surviving corporation in a
merger if:



 o    the merger agreement does not amend the
      existing  articles of incorporation,

 o    each shareholder of the surviving corporation
      whose shares were outstanding immediately
      before the merger will hold the same number of
      shares, with identical designations, preferences,
      limitations and relative rights immediately
      after the merger,

  o   the number of voting shares outstanding
      immediately after the merger, plus
      the number of voting shares issuable
      as a result of the merger or by the
      exercise of rights and warrants issued
      pursuant to the merger, will not exceed
      by more than 20% the total number of
      shares of the surviving corporation
      outstanding immediately before the merger, and

   o  the number of participating shares, shares
      that entitle their holders to participate
      without limitation on distributions,
      outstanding immediately after the merger,
      plus the number of participating shares
      issuable as a result of the merger either
      by the conversion of securities issued
      pursuant to the merger or by the exercise
      of rights and warrants issued pursuant to the
      merger, will not exceed by more than 20% the
      total number of participating shares outstanding
      immediately before the merger.


                Delaware

  Generally requires that a majority of
  the stockholders of both acquiring and
  target corporations approve statutory
  mergers.  Does not require a stockholder
  vote of the surviving corporation in a
  merger, unless the corporation provides
  otherwise in its certificate of
  incorporation, if:


                                                             65

<PAGE>
 -    the merger agreement does not amend the existing certificate of
      incorporation,

 -    each share of the stock of the surviving corporation outstanding
      immediately before the effective date of the merger is to be an
      identical outstanding or treasury share of the surviving
      corporation after the merger, and

 -    either no shares of common stock of the surviving corporation
      and no shares, securities or obligations convertible into such
      stock are to be issued or delivered under the plan of merger, or
      the authorized unissued shares or the treasury shares of common
      stock of the surviving corporation to be issued or delivered
      under the plan of merger plus those initially issuable upon
      conversion of any other shares, securities or obligations to be
      issued or delivered under such plan do not exceed 20% of the
      shares of common stock of the surviving corporation outstanding
      immediately prior to the effective date of the merger.

         Both Delaware and Colorado law also require that a sale of all or
substantially all of the assets of a corporation be approved by a majority of
the outstanding voting shares of the corporation transferring such assets.

         Both Colorado and Delaware law generally do not require class voting,
except in transactions involving an amendment to the certificate of
incorporation that adversely affect a specific class of shares of where the
class of securities designates such a right.

    Stockholder Approval of Certain Business Combinations under Delaware Law

         In recent years, a number of states have adopted special laws designed
to make certain kinds of "unfriendly" corporate takeovers, or other transactions
involving a corporation and one or more of its significant stockholders, more
difficult. Under Section 203 of the DGCL, certain "business combinations" with
"interested stockholders" of Delaware corporations are subject to a three-year
moratorium unless specified conditions are met.

         Section 203 prohibits a Delaware corporation from engaging in a
"business combination" with an "interested stockholder" for three years
following the date that such person or entity becomes an interested stockholder.
With some exceptions, an interested stockholder is a person or entity who or
which owns, individually or with or through certain other persons or entities,
15% or more of the corporation's outstanding voting stock, including any rights
to acquire stock pursuant to an option, warrant, agreement, arrangement or
understanding, or upon the exercise of conversion or exchange rights, and stock
with respect to which the person has voting rights only, or is an affiliate or
associate of the corporation and was the owner, individually or with or through
certain other persons or entities, of 15% or more of such voting stock at any
time within the previous three years, or is an affiliate or associate of any of
the foregoing.


                                                             66

<PAGE>



For purposes of Section 203, the term "business combination" is defined broadly
to include:

-       mergers with or caused by the interested stockholder;

-       sales or other dispositions to the interested stockholder, except
        proportionately with the corporation's other stockholders, of assets of
        the corporation or a direct or indirect majority-owned subsidiary equal
        in aggregate market value of 10% or more of the aggregate market value
        of either the corporation's consolidated assets or all of its
        outstanding stock;

-       the issuance or transfer by the corporation or a direct or indirect
        majority-owned subsidiary of stock of the corporation of such subsidiary
        to the interested stockholder, except for some transfers in a conversion
        or exchange or a pro rata distribution or certain other transactions,
        none of which increase the interested stockholder's proportionate
        ownership of any class or series of the corporation's or such
        subsidiary's stock or of the corporation's voting stock; or

-       receipt by the interested stockholder, except proportionately as a
        stockholder, directly or indirectly, of any loans, advances, guarantees,
        pledges or other financial benefits provided by or through the
        corporation or a subsidiary.

The three-year moratorium imposed on business combinations by Section 203 does
not apply if:

-       prior to the date on which such stockholder becomes an interested
        stockholder the board of directors approves either the business
        combination or the transaction that resulted in the person or entity
        becoming an interested stockholder,




                                                             67

<PAGE>



-       upon consummation of the transaction that made him or her an interested
        stockholder, the interested stockholder owns at least 85% of the
        corporation's voting stock outstanding at the time the transaction
        commenced, excluding from the 85% calculation shares owned by directors
        who are also officers of the target corporation and shares held by
        employee stock plans that do not give employee participants the right to
        decide confidentially whether to accept a tender or exchange offer, or

-       on or after the date such person or entity becomes an interested
        stockholder, the board approves the business combination and it is
        also approved at a stockholder meeting by 66 2/3% of the outstanding
        voting stock not owned by the interested stockholder.

Section 203 only applies to certain publicly held corporations that have a class
of voting stock that is:

   -       listed on a national securities exchange,

   -       quoted on an interdealer quotation system of a registered national
           securities association, or

   -       held of record by more than 2,000 stockholders.

Under some circumstances, Section 203 of the Delaware General Corporate Law may
make it more difficult for a person who would be an "interested stockholder" to
effect various business combinations with a corporation for a three year period.

There is no provision in the CBCA equivalent to Section 203 of the DGCL.

Interested Director Transactions

Under both Delaware and Colorado law, contracts or transactions in which one or
more of a corporation's directors has an interest, are not void or voidable
because of such interest provided that conditions, such as obtaining the
required approval and fulfilling the requirements of good faith and full
disclosure, are met. Subject to particular exceptions, the conditions are
similar under Delaware and Colorado law. Under Delaware and Colorado, (a) either
the stockholders or the board of directors must approve any such contract or
transaction after full disclosure of the material facts, and, in the case of
board approval, the contract or transaction must also be "fair" to the
corporation, or (b) the contract or transaction must have been fair as to the
corporation at the time it was approved. If board approval is sought, the
contract or transaction must be approved by a majority vote of a quorum of the
directors, without counting the vote of any interested directors, except that
interested directors may be counted for purposes of establishing a quorum.

Appraisal/Dissenters' Rights

Under both Delaware and Colorado law, shareholders of a corporation
participating in certain major corporate transactions may, under varying
circumstances, be entitled to appraisal/dissenters' rights by which such
shareholder may receive cash in the amount of the fair market value of his or
her shares in lieu of the consideration he or she would otherwise receive in the
transactions. Under both Delaware and Colorado law, such fair market value is
determined exclusive of any element of value arising from the accomplishment or
expectation of the merger or consolidation.



                                                             68

<PAGE>

                Colorado

Dissenters' rights are not available (a)
with respect to the sale of all or
substantially all of the assets of the
corporation or a merger if no vote of
the shareholders is required to approve
the transaction under Colorado law, or
(b) to shareholders of shares which
either were listed on a national
securities exchange registered under the
federal Securities and Exchange Act of
1934 or on the national market system of
the National Association of Securities
Dealers Automated System or were held of
record by more than 2,000 holders, if
such shareholders receive only shares of
the surviving corporation or shares of
any other corporation that are
registered under the federal Securities
Act of 1934 or on the national market
system of the National Association of
Securities Dealers Automated quotation
System or held of record by more than
2,000 holders, plus cash in lieu of
fractional shares.



                Delaware

Appraisal rights are not available (a)
with respect to the sale of all or
substantially all of the assets of a
corporation, (b) with respect to a
merger or consolidation by a corporation
the shares of which are either listed on
a national securities exchange,
designated as a national market system
security on an interdealer quotation
system by the National Association of
Securities Dealers, Inc. or are held of
record by more than 2,000 holders, if
such stockholders receive only shares of
the surviving corporation or shares of
any other corporation that are either
listed on a national securities
exchange, designated as a national
market system security on an interdealer
quotation system by the National
Association of Securities Dealers, inc.
or held of record by more than 2,000
holders, plus cash in lieu of fractional
shares of such corporations, or (c) to
stockholders of a corporation surviving
a merger if no vote of the stockholders of
the surviving corporation is required to
approve the merger under Delaware law.




                                                             69

<PAGE>
                                  Legal Matters

         Legal matters relating to the validity of the Key common stock issuable
in connection with the merger have been passed upon for Key by Holme Roberts &
Owen LLP. Certain tax matters relating to the merger will be passed upon for
Columbus by Sherman & Howard L.L.C. See "Material United States Federal Income
Tax Consequences" on page __.

                                     Experts

         The audited Key consolidated financial statements incorporated by
reference in this proxy statement/prospectus have been audited by Arthur
Andersen LLP, independent public accountants, as indicated by their report with
respect thereto, and are incorporated by reference herein in reliance upon the
authority of said firm as experts in accounting and auditing in giving said
reports.

         The information incorporated by reference into this prospectus
regarding the total proved reserves of Key was prepared by Key and audited by
Ryder Scott Company, L.P. as stated in their letter reports, and is incorporated
by reference in reliance upon the authority of said firm as experts in such
matters.

         The financial statements of Columbus Energy Corp. incorporated in this
proxy statement/prospectus by inclusion of its Annual Report on Form 10-K for
the year ended November 30, 1999, have been so incorporated in reliance on the
report of PricewaterhouseCoopers LLP, independent accountants, given on the
authority of said firm as experts in accounting and auditing.

         Representatives of PricewaterhouseCoopers LLP are expected to be
present at the special meeting where they will have the opportunity to make a
statement if they desire to do so and will be available to respond to
appropriate questions.

         Certain information with respect to the oil and gas reserves of
Columbus derived from the report of Reed W. Ferrill & Associates, Inc.,
independent consulting petroleum engineers, has been included herein upon the
authority of said firm as experts with respect to matters covered by such report
and in giving such report.


                          Future Shareholder Proposals

         Columbus expects to hold an annual meeting of shareholders in 2001 only
if the merger is not consummated. In the event of such a meeting, any Columbus
shareholder who intends to submit a proposal for inclusion in the proxy
materials for the 2001 annual meeting of Columbus is required to submit such
proposal to the Secretary of Columbus by November 28, 2000. Such proposals may
be included in next year's Proxy Statement if they comply with certain rules and
regulations of the SEC. In the event of such meeting, under Columbus' current
by-laws, a shareholder who intends to present a proposal to be considered at the
meeting, other than a shareholder proposal included in the proxy statement, must
provide notice of such proposal to the Secretary of Columbus by February 12,
2001.




                                                             70

<PAGE>




                       Where You Can Find More Information

         Key and Columbus file annual, quarterly and special reports, proxy
statements and other information with the SEC. You may read and copy any
materials we file at the SEC's public reference rooms in Washington, D.C., New
York, New York and Chicago, Illinois. Please call the SEC at 1-800-SEC-0330 for
further information on the public reference rooms. Our SEC filings are also
available to the public from commercial document retrieval services and at the
web site maintained by the SEC at "http://www.sec.gov."

         Key filed a registration statement on Form S-4 to register with the SEC
the Key common stock to be issued to Columbus shareholders in the merger. This
proxy statement/prospectus is a part of that registration statement and
constitutes a prospectus of Key in addition to being a proxy statement of Key
and Columbus for the meetings. As allowed by SEC rules, this proxy
statement/prospectus does not contain all the information you can find in the
registration statement or the exhibits to the registration statement.

         The SEC allows Key and Columbus to "incorporate by reference"
information into this proxy statement/ prospectus, which means that they can
disclose important information to you by referring you to another document filed
separately with the SEC. The information incorporated by reference is deemed to
be part of this proxy statement/prospectus, except for any information
superseded by information in, or incorporated by reference in, this proxy
statement/prospectus. This proxy statement/ prospectus incorporates by reference
the documents listed below that Key and Columbus have previously filed with the
SEC. These documents contain important information about Key and Columbus.

            KEY SEC FILINGS
          (FILE NO. 000-11769)              PERIOD
------------------------------------------  ------------------------------------
Description of Common Stock contained in
Form 8-A Registration Statement             Filed September 2, 1988
Annual Report on Form 10-K                  Year ended December 31, 1999
Quarterly Report on Form 10-Q               Quarter ended March 31, 2000
Quarterly Report on Form 10-Q               Quarter ended June 30, 2000
Proxy Statement on Schedule 14A             For Annual Meeting May 25, 2000
Form 425 Filed August 29, 2000

         COLUMBUS SEC FILINGS
          (FILE NO. 001-9872)               PERIOD
------------------------------------------  ------------------------------------
Annual Report on Form 10-K                  Year ended November 30, 1999
Quarterly Report on Form 10-Q               Quarter ended May 31, 2000
Proxy Statement on Schedule 14A             For Annual Meeting May 4, 2000

         Columbus' SEC filings listed above (other than the proxy statement) are
attached to this proxy statement/prospectus as Annexes C and D.

         Key and Columbus are also incorporating by reference additional
documents that they file with the SEC between the date of this proxy
statement/prospectus and the date of the meetings.

         Key has supplied all information contained or incorporated by reference
in this proxy statement/prospectus relating to Key, and Columbus has supplied
all



                                                             71

<PAGE>



information contained or incorporated by reference in this proxy
statement/prospectus relating to Columbus.

         You can obtain any of the documents incorporated by reference by
contacting Key directly, or the SEC. Documents incorporated by reference are
available from Key without charge, excluding all exhibits unless an exhibit in
this proxy statement/prospectus has been specifically incorporated by reference.

         You can also get more information by visiting Key's web site at
"http://www.keyproduction.com" and Columbus' web site at
"http://www.columbusegy.com." Web site materials are not part of this proxy
statement/prospectus.

         You should rely only on the information contained or incorporated by
reference in this proxy statement/prospectus. We have not authorized anyone to
provide you with information that is different from what is contained in this
proxy statement/prospectus. This proxy statement/prospectus is dated ________,
2000. You should not assume that the information contained in the proxy
statement/prospectus is accurate as of any date other than such date, and
neither the mailing of this proxy statement/prospectus to shareholders nor the
issuance of the Key common stock in the merger shall create any implication to
the contrary.

                         Cautionary Statement Concerning
                           Forward-Looking Statements

         Key and Columbus have made forward-looking statements in this document
and in the documents referred to in this document, which are subject to risks
and uncertainties. These statements are based on the beliefs and assumptions of
our managements and on the information currently available to them. These
forward-looking statements include, among others, statements concerning Key's
and Columbus' outlooks for the remainder of 2000 with regard to production
levels, price realizations, expenditures for exploration and development, plans
for funding operations and capital expenditures and other statements of
expectations, beliefs, future plans and strategies, anticipated events or trends
and similar expressions concerning matters that are not historical facts. These
forward-looking statements are subject to risks and uncertainties that could
cause actual results to differ materially from those expressed or implied by the
statements.

         These risks and uncertainties include, but are not limited to,
fluctuations in the price each company receives for oil and gas production,
reductions in the quantity of oil and gas sold due to decreased industry-wide
demand and/or curtailments in production from specific properties due to
mechanical, marketing or other problems, operating and capital expenditures that
are either significantly higher or lower than anticipated because the actual
cost of identified projects varied from original estimates and/or from the
number of exploration and development opportunities being greater or fewer than
currently anticipated and increased financing costs due to a significant
increase in interest rates. These and other risks and uncertainties affecting
Key and Columbus are discussed in greater detail in this proxy
statement/prospectus and the documents incorporated by reference in this proxy
statement/prospectus.

         Except for their ongoing obligations to disclose material information
as required by the federal securities laws, Key and Columbus do not have any
intention or obligation to update forward-looking statements after they
distribute this document.



                                                             72

<PAGE>





                         Commonly Used Oil and Gas Terms

    "BBL" means barrel.

    "BBL/D" means Bbls per day.

    "BCF" means billion cubic feet.

    "MBBLS" means thousand barrels.

    "MCF" means thousand cubic feet.

    "MCFE", MMCFE and BCFE mean, respectively, thousand, million and billion
equivalent cubic feet of gas, calculated by converting oil and NGLs to
equivalent Mcf. The U.S. convention for this conversion is one-sixth Bbl equals
one Mcfe.

    "MMBBLS" means million barrels.

    "MMCF" means million cubic feet.

    "MMCF/D" means MMcf per day.

    "Oil" includes crude oil, condensate and natural gas liquids.





                                                             73

<PAGE>



                                      PROXY
                              COLUMBUS ENERGY CORP.
               PROXY SOLICITED ON BEHALF OF THE BOARD OF DIRECTORS

The undersigned shareholder of Columbus Energy Corp., a Colorado corporation,
hereby nominates and appoints J. Samuel Butler or Jerol M. Sonosky, with full
power of substitution, as true and lawful agent and proxy to represent the
undersigned and vote all shares of stock of Columbus Energy Corp. owned by the
undersigned in all matters coming before the Special Meeting of Shareholders (or
any adjournment thereof) of Columbus Energy Corp. to be held at the Wells Fargo
Bank Building Forum Room, Main Floor, 1740 Broadway, Denver Colorado. The Board
of Directors recommends a vote "FOR" the matters set forth on the reverse side.

SEE REVERSE    CONTINUED AND TO BE SIGNED ON REVERSE SIDE    SEE REVERSE
SIDE                                                         SIDE

                           DETACH HERE
--------------------------------------------------------------------------------
 /X/  PLEASE MARK
     VOTES AS IN THIS
     EXAMPLE.

WHEN PROPERLY EXECUTED, THIS PROXY WILL BE VOTED IN THE MANNER SPECIFIED BELOW
BY THE SHAREHOLDER. TO THE EXTENT CONTRARY SPECIFICATIONS ARE NOT GIVEN, THIS
PROXY WILL BE VOTED "FOR" THE MATTERS LISTED BELOW.

                                                          FOR   AGAINST  ABSTAIN
1. Approve the merger agreement and the merger.           / /     / /     / /

2. Other matters: In their discretion, to vote with
   respect to any other matters that may come before the
   meeting or any adjournment thereof, including matters
   incident to its conduct.

         MARK HERE IF YOU PLAN TO ATTEND THE MEETING                       / /

         MARK HERE FOR ADDRESS CHANGE AND NOTE AT LEFT                     / /

                        Please sign exactly as your name appears at left,
                        indicating your official position or representative
                        capacity, if applicable. If shares are held jointly,
                        each owner should sign.

Signature:                       Date
           --------------------  ----------

Signature:                      Date
          --------------------- ----------
<PAGE>
ANNEX A

                          AGREEMENT AND PLAN OF MERGER
                                  BY AND AMONG
                          KEY PRODUCTION COMPANY, INC.,
                            KEY ACQUISITION TWO, INC.
                                       AND
                              COLUMBUS ENERGY CORP.
                           DATED AS OF AUGUST 28, 2000



         THIS AGREEMENT AND PLAN OF MERGER, dated as of August 28, 2000 (this
"Agreement"), is by and among Key Production Company, Inc., a Delaware
corporation ("Key"), Key Acquisition Two, Inc., a Colorado corporation and
wholly owned subsidiary of Key ("Merger Sub"), and Columbus Energy Corp., a
Colorado corporation ("Columbus"). Key and Merger Sub are sometimes referred to
herein as the "Key Companies."

         WHEREAS, Merger Sub, upon the terms and subject to the conditions of
this Agreement and in accordance with the Colorado Business Corporation Act
("Colorado Law"), will merge with and into Columbus (the "Merger"), and pursuant
thereto, the issued and outstanding shares of common stock of Columbus
("Columbus Common Stock") not owned directly or indirectly by Columbus or the
Key Companies or their respective subsidiaries will be converted into the right
to receive shares of common stock, $.25 par value, of Key (the "Key Common
Stock"), as set forth herein;

         WHEREAS, the Board of Directors of Columbus, after actively soliciting
and considering business combination proposals and indications of interest from
other persons, has determined that the Merger is consistent with and in
furtherance of the long-term business strategy of Columbus and is fair to, and
in the best interests of, Columbus and its stockholders and has approved and
adopted this Agreement and the transactions contemplated hereby, and recommended
adoption of this Agreement by the stockholders of Columbus;

         WHEREAS, the Board of Directors of Key has determined that the Merger
is consistent with and in furtherance of the long-term business strategy of Key
and is fair to, and in the best interests of, Key and its stockholders and has
approved and adopted this Agreement and the transactions contemplated hereby;

         WHEREAS, the Board of Directors of Merger Sub has approved and adopted
this Agreement and Key, as the sole stockholder of Merger Sub, will adopt this
Agreement promptly after the execution hereof by the parties hereto; and

         WHEREAS, for federal income tax purposes, it is intended that the
Merger qualify as a reorganization under the provisions of section 368(a) of the
United States Internal Revenue Code of 1986, as amended (the "Code") and that
this Agreement constitute a plan of reorganization;

         NOW, THEREFORE, in consideration of the foregoing and the respective
representations, warranties, covenants and agreements set forth in this
Agreement, the parties hereto agree as follows:


                                      A-1
<PAGE>




                                    ARTICLE I

                                   THE MERGER

  SECTION 1.01. The Merger. Upon the terms and subject to the conditions set
forth in this Agreement, and in accordance Colorado Law, at the Effective Time
(as defined in Section 1.02 of this Agreement), Merger Sub shall be merged with
and into Columbus. As a result of the Merger, the separate corporate existence
of Merger Sub shall cease and Columbus shall continue as the surviving
corporation of the Merger (the "Surviving Corporation"). Certain terms used in
this Agreement are defined in Section 9.03 hereof.

  SECTION 1.02. Closing; Closing Date; Effective Time. Unless this Agreement
shall have been terminated pursuant to Section 8.01, and subject to the
satisfaction or, if permissible, waiver of the conditions set forth in Article
VII, the consummation of the Merger and the closing of the transactions
contemplated by this Agreement (the "Closing") shall take place at the offices
of Key as soon as practicable (but in any event within two business days) after
the satisfaction or, if permissible, waiver of the conditions set forth in
Article VII, or at such other date, time and place as Key and Columbus may
agree; provided, that the conditions set forth in Article VII shall have been
satisfied or waived at or prior to such time. The date on which the Closing
takes place is referred to herein as the "Closing Date". As promptly as
practicable on the Closing Date, the parties hereto shall cause the Merger to be
consummated by filing Articles of Merger with the Secretary of State of the
State of Colorado, in such form as required by, and executed in accordance with
the relevant provisions of, Colorado Law (the date and time of such filing, or
such later date or time agreed upon by Key and Columbus and set forth therein,
being the "Effective Time"). For all Tax purposes, the Closing shall be
effective at the end of the day on the Closing Date.

  SECTION 1.03. Effect of the Merger. At the Effective Time, the effect of the
Merger shall be as provided in the applicable provisions of Colorado Law.

  SECTION 1.04. Articles of Incorporation; Bylaws. At the Effective Time, the
articles of incorporation of Columbus, as in effect immediately prior to the
Effective Time, shall be the articles of incorporation of the Surviving
Corporation and thereafter shall continue to be its articles of incorporation
until amended as provided therein and pursuant to Colorado Law. The bylaws of
Columbus, as in effect immediately prior to the Effective Time, shall be the
bylaws of the Surviving Corporation and thereafter shall continue to be its
bylaws until amended as provided therein and pursuant to Colorado Law.

  SECTION 1.05. Directors and Officers. The directors of Merger Sub immediately
prior to the Effective Time shall be the directors of the Surviving Corporation,
each to hold office in accordance with the charter and bylaws of the Surviving
Corporation, and the officers of Merger Sub immediately prior to the Effective
Time shall be the officers of the Surviving Corporation, each to hold office in
accordance with the bylaws of the Surviving Corporation, in each case until
their respective successors are duly elected or appointed and qualified.

                                   ARTICLE II

               CONVERSION OF SECURITIES; EXCHANGE OF CERTIFICATES



                                                             A-2

<PAGE>



  SECTION 2.01. Merger Consideration; Conversion and Cancellation of Securities.
At the Effective Time, by virtue of the Merger and without any action on the
part of the Key Companies, Columbus or their respective stockholders:

    (a) Subject to the other provisions of this Article II, each share of
Columbus Common Stock issued and outstanding immediately prior to the Effective
Time (excluding any Columbus Common Stock described in Section 2.01(b) of this
Agreement) shall be converted into the right to receive .355 share of Key Common
Stock (the "Exchange Ratio"). Notwithstanding the foregoing, if between the date
of this Agreement and the Effective Time the outstanding shares of Key Common
Stock or Columbus Common Stock shall have been changed into a different number
of shares or a different class, by reason of any stock dividend, subdivision,
reclassification, recapitalization, split, combination or exchange of shares,
the Exchange Ratio shall be correspondingly adjusted to reflect such stock
dividend, subdivision, reclassification, recapitalization, split, combination or
exchange of shares.

    (b) Notwithstanding any provision of this Agreement to the contrary, each
share of Columbus Common Stock held in the treasury of Columbus and each share
of Columbus Common Stock owned by Key or any direct or indirect wholly owned
subsidiary of Key or of Columbus immediately prior to the Effective Time shall
be canceled and extinguished without any conversion thereof and no payment shall
be made with respect thereto.

    (c) All shares of Columbus Common Stock shall cease to be outstanding and
shall automatically be canceled and retired, and each certificate previously
evidencing Columbus Common Stock outstanding immediately prior to the Effective
Time (other than Columbus Common Stock described in Section 2.01(b) of this
Agreement) ("Converted Shares") shall thereafter represent the right to receive,
subject to Section 2.02(f) of this Agreement, that number of shares of Key
Common Stock determined pursuant to the Exchange Ratio and, if applicable, cash
pursuant to Section 2.02(f) of this Agreement (the "Merger Consideration"). The
holders of certificates previously evidencing Converted Shares shall cease to
have any rights with respect to such Converted Shares except as otherwise
provided herein or by law. Such certificates previously evidencing Converted
Shares shall be exchanged for certificates evidencing whole shares of Key Common
Stock upon the surrender of such Certificates in accordance with the provisions
of Section 2.02 of this Agreement, without interest. No fractional shares of Key
Common Stock shall be issued in connection with the Merger and, in lieu thereof,
a cash payment shall be made pursuant to Section 2.02(f) of this Agreement.

    (d) Each share of common stock, par value $1.00 per share, of Merger Sub
issued and outstanding immediately prior to the Effective Time shall be
converted into one share of common stock, par value $.10 per share, of the
Surviving Corporation.

  SECTION 2.02. Exchange and Surrender of Certificates.

  (a) As of the Effective Time, Key shall deposit, or shall cause to be
deposited with Continental Stock Transfer & Trust Company of New York (the
"Exchange Agent"), for the benefit of the holders of certificates which
immediately prior to the Effective Time evidenced shares of Columbus Common
Stock (the "Columbus Certificates"), for exchange in accordance with this
Article II, certificates representing the shares of Key Common Stock (such
certificates for shares of Key Common Stock, together with any dividends or
distributions with respect thereto, being hereinafter referred to as the
"Exchange Fund") issuable pursuant to Section 2.01 in exchange for such shares
of Columbus Common Stock.


                                                             A-3

<PAGE>




  (b) As soon as reasonably practicable after the Effective Time, the Exchange
Agent shall mail to each holder of record of shares of Columbus Common Stock
immediately prior to the Effective Time (i) a letter of transmittal (which shall
specify that delivery shall be effected, and risk of loss and title to the
Columbus Certificates shall pass, only upon delivery of the Columbus
Certificates to the Exchange Agent, and which shall be in such form and have
such other provisions as Key and Columbus may reasonably specify) and (ii)
instructions for use in effecting the surrender of the Columbus Certificates in
exchange for certificates representing shares of Key Common Stock. Upon
surrender of a Columbus Certificate for cancellation to the Exchange Agent
together with such letter of transmittal, duly executed, the holder of such
Columbus Certificate shall be entitled to receive in exchange therefor a
certificate representing that number of whole shares of Key Common Stock which
such holder has the right to receive in respect of the Columbus Certificate
surrendered pursuant to the provisions of this Article II (after taking into
account all shares of Columbus Common Stock then held by such holder), and the
Columbus Certificate so surrendered shall forthwith be canceled. In the event of
a transfer of ownership of Columbus Common Stock which is not registered in the
transfer records of Columbus, a certificate representing the proper number of
shares of Key Common Stock may be issued to a transferee if the Columbus
Certificate representing such Columbus Common Stock is presented to the Exchange
Agent, accompanied by all documents required to evidence and effect such
transfer and by evidence that any applicable stock transfer taxes have been
paid. Until surrendered as contemplated by this Section 2.02, each Columbus
Certificate shall be deemed at any time after the Effective Time to represent
only the Key Common Stock into which the shares of Columbus Common Stock
represented by such Columbus Certificate have been converted as provided in this
Article II and the right to receive upon such surrender cash in lieu of any
fractional shares of Key Common Stock as contemplated by this Section 2.02.

  (c) After the Effective Time, there shall be no further registration of
transfers of Columbus Common Stock. If, after the Effective Time, certificates
representing shares of Columbus Common Stock are presented to Key or the
Exchange Agent, they shall be canceled and exchanged for the Merger
Consideration provided for, and in accordance with the procedures set forth, in
this Agreement.

  (d) Any portion of the Merger Consideration made available to the Exchange
Agent pursuant to Section 2.02(a) or the Exchange Fund that remains unclaimed by
the holders of shares of Columbus Common Stock one year after the Effective Time
shall be returned to Key, upon demand, and any such holder who has not exchanged
its shares of Columbus Common Stock in accordance with this Section 2.02 prior
to that time shall thereafter look only to Key for payment of the Merger
Consideration in respect of its shares of Columbus Common Stock. Notwithstanding
the foregoing, Key shall not be liable to any holder of Columbus Common Stock
for any amount paid to a public official pursuant to applicable abandoned
property escheat or similar laws.

  (e) No dividends, interest or other distributions with respect to shares of
Columbus Common Stock shall be paid the holder of any unsurrendered Columbus
Certificates until such Columbus Certificates are surrendered as provided in
this Section 2.02. Upon such surrender, there shall be paid, without interest,
to the person in whose name the certificates representing the shares of Key
Common Stock into which such shares of Columbus Common Stock were converted all
dividends and other distributions payable in respect of such securities on a
date subsequent to, and in respect of a record date after, the Effective Time.



                                                             A-4

<PAGE>



  (f) No certificates or scrip evidencing fractional shares of Key Common Stock
shall be issued upon the surrender for exchange of certificates, and such
fractional share interests shall not entitle the owner thereof to any rights of
a stockholder of Key. In lieu of any such fractional shares, each holder of a
certificate previously evidencing Converted Shares, upon surrender of such
certificate for exchange pursuant to this Article II, shall be paid an amount in
cash (without interest), rounded to the nearest cent, determined by multiplying
(i) the per share closing price of Key Common Stock on the New York Stock
Exchange as reported in the Wall Street Journal for the date of the Effective
Time (or, if there is no trading activity in Key Common Stock on the New York
Stock Exchange on such date, the first date of trading of Key Common Stock on
the New York Stock Exchange after the Effective Time) by (ii) the fractional
interest to which such holder would otherwise be entitled (after taking into
account all Converted Shares held of record by such holder at the Effective
Time).

  (g) Key shall be entitled to deduct and withhold from the consideration
otherwise payable pursuant to this Agreement to any former holder of Converted
Shares such amounts as Key (or any affiliate thereof) is required to deduct and
withhold with respect to the making of such payment under the Code, or any
provision of state, local or foreign tax law. To the extent that amounts are so
withheld by Key, such withheld amounts shall be treated for all purposes of this
Agreement as having been paid to the former holder of the Converted Shares in
respect of which such deduction and withholding was made by Key.

  SECTION 2.03. Options. Key shall assume each option to purchase shares of
Columbus Common Stock that is outstanding immediately prior to the Effective
Time (a "Columbus Option") and each Columbus Option shall, at the Effective
Time, no longer be an option to purchase Columbus Common Stock and shall be
converted into an option to purchase Key Common Stock (a "Converted Key
Option"). Each Converted Key Option shall, at the Effective Time, become fully
vested, shall include the same terms and conditions as the corresponding
Columbus Option, and shall be subject to the terms of the Columbus stock option
plan under which the corresponding Columbus Option was granted, except that the
Converted Key Option will be exercisable for a period of 12 months after the
Effective Time and not thereafter and further provided that the Columbus Options
that are incentive stock options within the meaning of Section 422 of the Code
("ISOs") may cease being ISOs as a result of the conversion provided for in this
Section 2.03. Key will use its best efforts to cause the exercise of such
options to be registered on Form S-8 prior to the time that the exercise price
of such options is less than the market price of the stock covered thereby. The
number of shares of Key Common Stock subject to each Converted Key Option shall
be equal to the number determined by multiplying the number of shares of
Columbus Common Stock subject to the corresponding Columbus Option by the
Exchange Ratio, rounded if necessary to the nearest whole share. The per share
exercise price for each Converted Key Option shall be equal to the per share
exercise price for the corresponding Columbus Option divided by the Exchange
Ratio, rounded if necessary to the nearest one-hundredth cent. In the case of
any Columbus Option that is an ISO, the number of shares and the exercise price
for the corresponding Converted Key Option shall be determined according to the
rules of Section 424(a) of the Code and the regulations promulgated thereunder.
Columbus shall, in consultation with Key, obtain the necessary consents and
waivers, adopt the necessary amendments to the Columbus stock option plans, and
take any other actions necessary to implement the matters described in this
Section 2.03. Key shall take all actions necessary to assume the Columbus stock
option plans and to amend the Columbus stock option plans to implement the
actions provided for in this Section 2.03. Following the issuance of the
Converted Key Options provided for in this Section 2.03, no further options


                                                             A-5

<PAGE>



shall be granted under the Columbus stock option plans and the Columbus stock
option plans shall be terminated.


                                   ARTICLE III

                   REPRESENTATIONS AND WARRANTIES OF COLUMBUS

  Columbus hereby represents and warrants to the Key Companies that:

  SECTION 3.01. Organization and Qualification; Subsidiaries. Each of Columbus
and its subsidiaries is duly organized, validly existing and in good standing
under the laws of the jurisdiction of its incorporation or organization, has all
requisite power and authority to own, lease and operate its properties and to
carry on its business as it is now being conducted and is duly qualified and in
good standing to do business in each jurisdiction in which the nature of the
business conducted by it or the ownership or leasing of its properties makes
such qualification necessary, other than where the failure to be so duly
qualified and in good standing would not have a Columbus Material Adverse
Effect. The term "Columbus Material Adverse Effect" as used in this Agreement
shall mean any change or effect that, individually or when taken together with
all other such changes or effects, would be materially adverse to the financial
condition, results of operations or business of Columbus and its subsidiaries,
taken as a whole. Schedule 3.01 of the disclosure schedule delivered to Key by
Columbus on the date hereof (the "Columbus Disclosure Schedule") sets forth, as
of the date of this Agreement, a true and complete list of all Columbus'
directly or indirectly owned subsidiaries, together with (A) the jurisdiction of
incorporation or organization of each subsidiary and the percentage of each
subsidiary's outstanding capital stock or other equity interests owned by
Columbus or another subsidiary of Columbus, and (B) an indication of whether
each such subsidiary is a "Significant Subsidiary" as defined in Section 9.03(g)
of this Agreement. Except as set forth in Schedule 3.01 to the Columbus
Disclosure Schedule, neither Columbus nor any of its subsidiaries owns an equity
interest in any partnership or joint venture arrangement or business entity that
is material to the financial condition, results of operations or business of
Columbus and its subsidiaries, taken as a whole.

  SECTION 3.02. Charter and Bylaws. Columbus has heretofore furnished to Key
complete and correct copies of the charter and the bylaws or the equivalent
organizational documents, in each case as amended or restated, of Columbus and
each of its subsidiaries. Neither Columbus nor any of its subsidiaries is in
violation of any of the provisions of its charter or any material provision of
its bylaws (or equivalent organizational documents).

  SECTION 3.03. Capitalization.

  (a) As of the date of this Agreement (1) 3,751,668 shares were issued and
outstanding, (2) authorized capital stock of Columbus consists of (i) 20,000,000
shares of Columbus Common Stock, of which 904,909 shares were held in treasury
by Columbus and (3) 475,000 shares were reserved for future issuance pursuant to
outstanding stock options ("Stock Options") granted pursuant to Columbus' 1985
Stock Option Plan, 1995 Employees' Stock Option Plan and Non-Statutory Stock
Option Agreements (the "Option Plans"); and (ii) 5,000,000 shares of preferred
stock ("Columbus Preferred Stock"), of which no shares are issued and
outstanding. Except as described in this Section 3.03 or in Schedule 3.03(a) to
the Columbus Disclosure Schedule, as of the date of this Agreement, no shares of
capital stock of Columbus


                                                             A-6

<PAGE>



are reserved for any purpose. Each of the outstanding shares of capital stock
of, or other equity interests in, each of Columbus and its subsidiaries is duly
authorized, validly issued, and, in the case of shares of capital stock, fully
paid and nonassessable, and has not been issued in violation of (nor are any of
the authorized shares of capital stock of, or other equity interests in, such
entities subject to) any preemptive or similar rights created by statute, the
charter or bylaws (or the equivalent organizational documents) of Columbus or
any of its subsidiaries, or any agreement to which Columbus or any of its
subsidiaries is a party or bound, and such outstanding shares or other equity
interests owned by Columbus or a subsidiary of Columbus are owned free and clear
of all security interests, liens, claims, pledges, agreements, limitations on
Columbus' or such subsidiaries' voting rights, charges or other encumbrances of
any nature whatsoever.

  (b) Except as set forth in Section 3.03(a) above or in Schedule 3.03(b)(i) to
the Columbus Disclosure Schedule, there are no options, warrants or other rights
(including registration rights), agreements, arrangements or commitments of any
character to which Columbus or any of its subsidiaries is a party relating to
the issued or unissued capital stock of Columbus or any of its subsidiaries or
obligating Columbus or any of its subsidiaries to grant, issue or sell any
shares of the capital stock of Columbus or any of its subsidiaries, by sale,
lease, license or otherwise. Each Columbus Option that is outstanding
immediately prior to the Effective Time shall be cancelled as of the Effective
Time. Except as set forth in Schedule 3.03(b)(ii) to the Columbus Disclosure
Schedule, there are no obligations, contingent or otherwise, of Columbus or any
of its subsidiaries to (i) repurchase, redeem or otherwise acquire any shares of
Columbus Common Stock or other capital stock of Columbus, or the capital stock
or other equity interests of any subsidiary of Columbus; or (ii) (other than
advances to subsidiaries in the ordinary course of business) provide material
funds to, or make any material investment in (in the form of a loan, capital
contribution or otherwise), or provide any guarantee with respect to the
obligations of, any subsidiary of Columbus or any other person. Except as
described in Schedule 3.03(b)(iii) to the Columbus Disclosure Schedule, neither
Columbus nor any of its subsidiaries (x) directly or indirectly owns, (y) has
agreed to purchase or otherwise acquire or (z) holds any interest convertible
into or exchangeable or exercisable for, 5% or more of the capital stock of any
corporation, partnership, joint venture or other business association or entity
(other than the subsidiaries of Columbus set forth in Schedule 3.01 to the
Columbus Disclosure Schedule). Except as set forth in Schedule 3.03(b)(iv) to
the Columbus Disclosure Schedule and except for any agreements, arrangements or
commitments between Columbus and its subsidiaries or between such subsidiaries,
there are no agreements, arrangements or commitments of any character
(contingent or otherwise) pursuant to which any person is or may be entitled to
receive any payment based on the revenues or earnings, or calculated in
accordance therewith, of Columbus or any of its subsidiaries. There are no
voting trusts, proxies or other agreements or understandings to which Columbus
or any of its subsidiaries is a party or by which Columbus or any of its
subsidiaries is bound with respect to the voting of any shares of capital stock
of Columbus or any of its subsidiaries.

  (c) Columbus has made available to Key complete and correct copies of (i) the
Option Plans and the forms of options issued pursuant to the Option Plans,
including all amendments thereto and (ii) all options that are not in the form
thereof provided under clause (i) above. Schedule 3.03(c) to the Columbus
Disclosure Schedule sets forth a complete and correct list of all outstanding
options, restricted stock or any other stock awards (the "Stock Awards") granted
under the Option Plans or otherwise, setting forth as of the date hereof (i) the
number and type of Stock Awards, (ii) the exercise price of each outstanding
Stock Option, and


                                                             A-7

<PAGE>



(iii) the number of Stock Options exercisable.

  SECTION 3.04. Authority. Columbus has all requisite corporate power and
authority to execute and deliver this Agreement, to perform its obligations
hereunder and to consummate the transactions contemplated hereby (subject to,
with respect to the Merger, the adoption of this Agreement by the stockholders
of Columbus as described in Section 3.15 hereof). The execution and delivery of
this Agreement by Columbus and the consummation by Columbus of the transactions
contemplated hereby have been duly authorized by all necessary corporate action
and no other corporate proceedings on the part of Columbus are necessary to
authorize this Agreement or to consummate the transactions contemplated hereby
(subject to, with respect to the Merger, the adoption of this Agreement by the
stockholders of Columbus as described in Section 3.15 hereof). This Agreement
has been duly executed and delivered by Columbus and, assuming the due
authorization, execution and delivery thereof by the Key Companies, constitutes
the legal, valid and binding obligation of Columbus, subject to bankruptcy,
insolvency, fraudulent conveyance, reorganization, moratorium and other statutes
or rules of law affecting the rights and remedies of creditors and secured
parties generally and general principles of equity, regardless of whether
applied in proceedings in equity or at law.

  SECTION 3.05. No Conflict; Required Filings and Consents.

  (a) The execution and delivery of this Agreement by Columbus does not, and the
consummation of the transactions contemplated hereby in accordance with its
terms will not (i) conflict with or violate the charter or bylaws, or the
equivalent organizational documents, in each case as amended or restated, of
Columbus or any of its subsidiaries, (ii) conflict with or violate any federal,
state, foreign or local law, statute, ordinance, rule, regulation, order,
judgment or decree (collectively, "Laws") applicable to Columbus or any of its
subsidiaries or by which any of their respective properties is bound or subject
or (iii) except as described in Schedule 3.05 to the Columbus Disclosure
Schedule, result in any breach of or constitute a default (or an event that with
notice or lapse of time or both would become a default) under, or give to others
any rights of termination, amendment, acceleration or cancellation of, or
require payment under, or result in the creation of a lien or encumbrance on any
of the properties or assets of Columbus or any of its subsidiaries pursuant to,
any note, bond, mortgage, indenture, contract, agreement, lease, license,
permit, franchise or other instrument or obligation to which Columbus or any of
its subsidiaries is a party or by or to which Columbus or any of its
subsidiaries or any of their respective properties is bound or subject, except
for any such conflicts or violations described in clause (ii) or breaches,
defaults, events, rights of termination, amendment, acceleration or
cancellation, payment obligations or liens or encumbrances described in clause
(iii) that would not have a Columbus Material Adverse Effect.

  (b) The execution and delivery of this Agreement by Columbus does not, and
consummation of the transactions contemplated hereby will not, require Columbus
to obtain any consent, license, permit, approval, waiver, authorization or order
of, or to make any filing with or notification to, any governmental or
regulatory authority, domestic or foreign (collectively, "Governmental
Entities"), except (i) for applicable requirements, if any, of the Securities
Act of 1933, as amended (the "Securities Act"), the Securities Exchange Act of
1934, as amended (the "Exchange Act"), and state securities or blue sky laws
("Blue Sky Laws"), and the filing and recordation of appropriate merger
documents as required by Colorado Law, (ii) applicable filings with the American
Stock Exchange and (iii) where the failure to obtain such consents, licenses,
permits, approvals, waivers, authorizations or


                                                             A-8

<PAGE>



orders, or to make such filings or notifications, would not, either individually
or in the aggregate, prevent Columbus from performing its obligations under this
Agreement and would not have a Columbus Material Adverse Effect.

  SECTION 3.06. Permits; Compliance. Except as disclosed in Schedule 3.14 of the
Columbus Disclosure Schedule, each of Columbus and its subsidiaries and to
Columbus' knowledge each third party operator of any of Columbus' properties, is
in possession of all franchises, grants, authorizations, licenses, permits,
easements, variances, exemptions, consents, certificates, approvals and orders
necessary to own, lease and operate its properties and to carry on its business
as it is now being conducted (collectively, the "Columbus Permits"), and there
is no action, proceeding or investigation pending or, to the knowledge of
Columbus, threatened regarding suspension or cancellation of any of the Columbus
Permits, except where the failure to possess, or the suspension or cancellation
of, such Columbus Permits would not have a Columbus Material Adverse Effect.
Except as disclosed in Schedule 3.14 of the Columbus Disclosure Schedule,
neither Columbus nor any of its subsidiaries is in conflict with, or in default
or violation of (a) any Law applicable to Columbus or any of its subsidiaries or
by or to which any of their respective properties is bound or subject or (b) any
of the Columbus Permits, except for any such conflicts, defaults or violations
that would not have a Columbus Material Adverse Effect. During the period
commencing on January 1, 1999 and ending on the date hereof, neither Columbus
nor any of its subsidiaries has received from any Governmental Entity any
written notification with respect to possible conflicts, defaults or violations
of Laws, except as set forth in Schedule 3.06 of the Columbus Disclosure
Schedule and except for written notices relating to possible conflicts, defaults
or violations that would not have a Columbus Material Adverse Effect.

  SECTION 3.07. Reports; Financial Statements.

  (a) Since December 31, 1997, Columbus and its subsidiaries have filed (i) all
forms, reports, statements and other documents required to be filed with (A) the
Securities and Exchange Commission (the "SEC") including, without limitation,
(1) all Annual Reports on Form 10-K, (2) all Quarterly Reports on Form 10-Q, (3)
all proxy statements relating to meetings of stockholders (whether annual or
special), (4) all Current Reports on Form 8-K and (5) all other reports,
schedules, registration statements or other documents (collectively referred to
as the "Columbus SEC Reports") and (B) any applicable state securities
authorities and (ii) all forms, reports, statements and other documents required
to be filed with any other applicable federal or state regulatory authorities,
except as disclosed in Schedule 3.14 of the Columbus Disclosure Schedule and
except where the failure to file any such forms, reports, statements or other
documents would not have a Columbus Material Adverse Effect (all such forms,
reports, statements and other documents in clauses (i) and (ii) of this Section
3.07(a) being referred to herein, collectively, as the "Columbus Reports"). The
Columbus Reports, including all Columbus Reports filed after the date of this
Agreement and prior to the Effective Time, (x) were or will be prepared in all
material respects in accordance with the requirements of applicable Law
(including, with respect to Columbus SEC Reports, the Securities Act and the
Exchange Act, as the case may be, and the rules and regulations of the SEC
thereunder applicable to such Columbus SEC Reports) and (y) did not at the time
they were filed, or will not at the time they are filed, contain any untrue
statement of a material fact or omit to state a material fact required to be
stated therein or necessary in order to make the statements therein, in the
light of the circumstances under which they were made, not misleading.

  (b) Each of the consolidated financial statements (including, in each case,

                                                             A-9

<PAGE>



any related notes thereto) contained in Columbus SEC Reports filed prior to the
Effective Time (i) have been or will be prepared in accordance with the
published rules and regulations of the SEC and generally accepted accounting
principles applied on a consistent basis throughout the periods involved (except
(A) to the extent required by changes in generally accepted accounting
principles and (B) with respect to Columbus SEC Reports filed prior to the date
of this Agreement, as may be indicated in the notes thereto) and (ii) fairly
present or will fairly present the consolidated financial position of Columbus
and its subsidiaries as of the respective dates thereof and the consolidated
results of operations and cash flows for the periods indicated (including
reasonable estimates of normal and recurring year- end adjustments), except that
(x) any unaudited interim financial statements were or will be subject to normal
and recurring year-end adjustments and (y) any pro forma financial statements
contained in such consolidated financial statements are not necessarily
indicative of the consolidated financial position of Columbus and its
subsidiaries as of the respective dates thereof and the consolidated results of
operations and cash flows for the periods indicated.

  SECTION 3.08. Absence of Certain Changes or Events. Except as disclosed in the
Columbus SEC Reports filed prior to the date of this Agreement or as
contemplated by this Agreement or as set forth in Schedule 3.08 to the Columbus
Disclosure Schedule, since May 31, 2000, Columbus and its subsidiaries have
conducted their respective businesses only in the ordinary course and in a
manner consistent with past practice and there has not been: (i) any material
damage, destruction or loss (whether or not covered by insurance) with respect
to any material assets of Columbus or any of its subsidiaries; (ii) any material
change by Columbus or its subsidiaries in their accounting methods, principles
or practices; (iii) except for dividends by a subsidiary of Columbus to Columbus
or another subsidiary of Columbus, any declaration, setting aside or payment of
any dividends or distributions in respect of shares of Columbus Common Stock or
the shares of stock of, or other equity interests in, any subsidiary of
Columbus, or any redemption, purchase or other acquisition by Columbus or any of
its subsidiaries of any of Columbus' securities or any of the securities of any
subsidiary of Columbus; (iv) any increase in the benefits under, or the
establishment or amendment of, any bonus, insurance, severance, deferred
compensation, pension, retirement, profit sharing, stock option (including,
without limitation, the granting of stock options, stock appreciation rights,
performance awards, or restricted stock awards), stock purchase or other
employee benefit plan, or any increase in the compensation payable or to become
payable to directors, officers or employees of Columbus or its subsidiaries; (v)
any revaluation by Columbus or any of its subsidiaries of any of their assets,
including the writing down of the value of inventory or the writing down or off
of notes or accounts receivable, other than in the ordinary course of business
and consistent with past practices; (vi) any entry by Columbus or any of its
subsidiaries into any commitment or transaction material to Columbus and its
subsidiaries, taken as a whole (other than this Agreement and the transactions
contemplated hereby); (vii) any material increase in indebtedness for borrowed
money; or (viii) a Columbus Material Adverse Effect.

  SECTION 3.09. Absence of Litigation. Except as disclosed in the Columbus SEC
Reports filed prior to the date of this Agreement or as set forth in Schedule
3.09 to the Columbus Disclosure Schedule, there is no claim, action, suit,
litigation, proceeding, arbitration or, to the knowledge of Columbus,
investigation of any kind, at law or in equity (including actions or proceedings
seeking injunctive relief), pending or, to the knowledge of Columbus, threatened
against Columbus or any of its subsidiaries or any properties or rights of
Columbus or any of its subsidiaries (except for claims, actions, suits,
litigation, proceedings, arbitrations or


                                                             A-10

<PAGE>



investigations which would not have a Columbus Material Adverse Effect), and
neither Columbus nor any of its subsidiaries is subject to any continuing order
of, consent decree, settlement agreement or other similar written agreement
with, or, to the knowledge of Columbus, continuing investigation by, any
Governmental Entity, or any judgment, order, writ, injunction, decree or award
of any Government Entity or arbitrator, including, without limitation,
cease-and-desist or other orders, except for matters that would not have a
Columbus Material Adverse Effect.

  SECTION 3.10. Employee Benefit Plans; Labor Matters.

  (a) Schedule 3.10(a) to the Columbus Disclosure Schedule sets forth each
employee benefit plan (as such term is defined in ERISA section 3(3)) maintained
or contributed to by Columbus or any member of its ERISA Group and any other
retirement, pension, stock option, stock appreciation right, profit sharing,
incentive compensation, deferred compensation, savings, thrift, vacation pay,
severance pay, or other employee compensation or benefit plan, agreement,
practice, or arrangement, whether written or unwritten, whether or not legally
binding, maintained or contributed to by Columbus or any member of its ERISA
Group (collectively, the "Columbus Benefit Plans"). For purposes of this
Agreement, "ERISA Group" means a controlled or affiliated group within the
meaning of Code section 414(b), (c), (m), or (o) of which Columbus is a member.
Columbus has furnished to Key correct and complete copies of all Columbus
Benefit Plans (including a detailed written description of any Columbus Benefit
Plan that is unwritten, including a description of eligibility criteria,
participation, vesting, benefits, funding arrangements and assets and any other
provisions relating to Columbus) and, with respect to each Columbus Benefit
Plan, a copy of each of the following, to the extent each is applicable to each
Columbus Benefit Plan: (i) the most recent favorable determination letter, (ii)
materials submitted to the Internal Revenue Service in support of a pending
determination letter request, (iii) the most recent letter issued by the
Internal Revenue Service recognizing tax exemption, (iv) each insurance
contract, trust agreement, or other funding vehicle, (v) the three most recently
filed Forms 5500 plus all schedules and attachments, (vi) the three most recent
actuarial valuations, and (vii) each summary plan description or other general
explanation or communication distributed or otherwise provided to employees with
respect to each Columbus Benefit Plan during the past five years that describes
the terms of the Columbus Benefit Plan.

  (b) With respect to the Columbus Benefit Plans, no event has occurred and, to
the knowledge of Columbus, there exists no condition or set of circumstances, in
connection with which Columbus or any member of its ERISA Group could reasonably
be expected to be subject to any liability under the terms of such Columbus
Benefit Plans, ERISA, the Code or any other applicable Law which would have a
Columbus Material Adverse Effect. Except as otherwise set forth on Schedule
3.10(b) to the Columbus Disclosure Schedule,

    (i) Each Columbus Benefit Plan has at all times been in compliance, in form
and in operation, in all material respects with all applicable requirements of
law and regulations, including without limitation ERISA. Each Columbus Benefit
Plan that is intended to be a qualified plan has received a favorable
determination letter from the Internal Revenue Service or is a standardized
master or prototype plan that is subject to a notification letter issued by the
National Office of the Internal Revenue Service; nothing has occurred since the
date of the most recent favorable determination letter or notification letter
that would cause the loss of the Columbus Benefit Plan's qualification; and each
such Columbus Benefit Plan has at all times been in compliance, in form and in
operation, in all material respects



                                                             A-11

<PAGE>



with the applicable requirements of the Internal Revenue Code and the applicable
Treasury Regulations.

    (ii) With respect to each Columbus Benefit Plan (including any benefit plan
that has been terminated prior to the date of this Agreement (a "Terminated
Plan")), there are no actions, suits, grievances, arbitrations or other manner
of litigation, or claim with respect to any Columbus Benefit Plan (except for
routine claims for benefits made in the ordinary course of plan administration
for which plan administrative procedures have not been exhausted) pending,
threatened or imminent against or with respect to any Columbus Benefit Plan, any
plan sponsor, or any fiduciary (as such term is defined in Section 3(21) of
ERISA) of such Columbus Benefit Plan or Terminated Plan, and Columbus has no
knowledge of any facts that could reasonably be expected to give rise to any
action, suit, grievance, arbitration or other manner of litigation, or action.

   (iii) All contributions required to be made to the Columbus Benefit Plans
pursuant to their terms and provisions or required by applicable law have been
made timely.

    (iv) Neither Columbus nor any member of its ERISA Group has ever maintained,
contributed to, or been obligated to contribute to any plan that is subject to
Title IV of ERISA or the minimum funding requirements of Section 412 of the
Code. Neither Columbus nor any member of its ERISA Group has ever contributed
to, been obligated to contribute to, or incurred any liability to a
multiemployer plan (as such term in defined in Section 3(37) of ERISA).

    (v) Neither Columbus nor any party in interest (as such term is defined in
ERISA section 3(14)) nor any disqualified person has engaged in any prohibited
transaction within the meaning of ERISA section 406 or Code section 4975 that
could reasonably be expected to result in a Columbus Material Adverse Effect.

    (vi) With respect to the Columbus Benefit Plans and the employees and
directors of Columbus, the consummation of the transactions contemplated by this
Agreement will not give rise to any acceleration of vesting of payments or
options, the acceleration of the time of making any payments, or the making of
any payments, which in the aggregate would result in an "excess parachute
payment" within the meaning of Section 280G of the Code and the imposition of
the excise tax under Section 4999 of the Code.

  (c) Neither Columbus nor any member of its ERISA Group is or has ever been a
party to any collective bargaining or other labor union contracts. No collective
bargaining agreement is being negotiated by Columbus or any of its subsidiaries.
There is no pending or threatened labor dispute, strike or work stoppage against
Columbus or any of its subsidiaries which could reasonably be expected to
interfere with the respective business activities of Columbus or any of its
subsidiaries. To the knowledge of Columbus, none of Columbus, any of its
subsidiaries or any of their respective representatives or employees has
committed any unfair labor practices in connection with the operation of the
respective businesses of Columbus or its subsidiaries, and there is no pending
or threatened charge or complaint against Columbus or any of its subsidiaries by
the National Labor Relations Board or any comparable state agency.

  (d) Except as disclosed in Schedule 3.10(a) to the Columbus Disclosure
Schedule, neither Columbus nor any of its subsidiaries is a party to or is bound
by any severance agreements, programs or policies. Schedule 3.10(d) to the
Columbus


                                                             A-12

<PAGE>



Disclosure Schedule sets forth, and Columbus has made available to Key true and
correct copies of (i) all employment agreements with Columbus or its
subsidiaries; (ii) all agreements with consultants of Columbus or its
subsidiaries; (iii) all non- competition agreements with Columbus or a
subsidiary executed by officers of Columbus; and (iv) all plans, programs,
agreements and other arrangements of Columbus or its subsidiaries with or
relating to its directors.

  (e) No Columbus Benefit Plan provides retiree medical or retiree life
insurance benefits to any person and neither Columbus nor any of its
subsidiaries is contractually or otherwise obligated (whether or not in writing)
to provide any person with life insurance or medical benefits upon retirement or
termination of employment, other than as required by the provisions of Sections
601 through 608 of ERISA and Section 4980B of the Code and each such Columbus
Benefit Plan or arrangement may be amended or terminated by Columbus or its
subsidiaries at any time without liability.

  (f) Except as contemplated by this Agreement or as set forth in Schedule
3.10(g), Columbus has not amended, or taken any other actions with respect to
any of the Columbus Benefit Plans or any of the plans, programs, agreements,
policies or other arrangements described in Section 3.10(d) of this Agreement
since January 1, 1999.

  (g) With respect to each Columbus Benefit Plan that is a "group health plan"
within the meaning of Section 5000(b) of the Code, each such Columbus Benefit
Plan complies and has complied in all material respects with the requirements of
Part 6 of Title I of ERISA and Sections 4980B and 5000 of the Code, or, if ERISA
and the Code do not apply, the requirements of applicable state law.

  (h) Columbus' federal income tax deduction for compensation paid or payable by
Columbus to employees covered by Section 162(m) of the Code has not been, and
will not be, limited by Section 162(m) of the Internal Revenue Code.

  (i) Any Columbus Benefit Plan that has been terminated prior to the date of
this Agreement was terminated in accordance with its provisions and applicable
law and each such Columbus Benefit Plan that was intended to be a qualified plan
has received a determination letter from the Internal Revenue Service to the
effect that the termination does not adversely affect such Columbus Benefit
Plan's qualification.

  (j) The Columbus Energy Corp. 401(k) Profit Sharing Plan and Trust will be
terminated immediately prior to the Effective Time, and Columbus will apply for
a determination letter from the Internal Revenue Service to the effect that the
termination of such Plan does not adversely affect the qualification of such
Plan.

  SECTION 3.11. Taxes.

  (a) (1) Except to the extent that the applicable statute of limitations has
expired, all Returns required to be filed by or on behalf of Columbus have been
duly filed on a timely basis and such Returns (including all attached statements
and schedules) are true, complete and correct in all material respects. Except
to the extent that the applicable statute of limitations has expired, all Taxes
shown to be payable on such Returns or on subsequent assessments with respect
thereto have been paid in full on a timely basis, and no other Taxes are
currently due and payable by Columbus with respect to items or periods covered
by such Returns (whether or not shown on or reportable on such Returns) or with
respect to any period prior to the Effective Time.



                                                             A-13

<PAGE>




    (2) Columbus has withheld and paid over all Taxes required to have been
withheld and paid over (including any estimated taxes), and has complied in all
material respects with all information reporting and backup withholding
requirements, including maintenance of required records with respect thereto, in
connection with amounts paid or owing to any employee, creditor, independent
contractor, or other third party.

    (3) Columbus has disclosed on its income tax returns all positions taken
therein that could give rise to a substantial understatement penalty within the
meaning of Code Section 6662.

    (4) There are no liens on any of the assets of Columbus with respect to
Taxes, other than liens for Taxes not yet due and payable or for Taxes that are
being contested in good faith through appropriate proceedings and for which
appropriate reserves have been established.

    (5) Columbus does not have any liability under Treasury Regulation (S)
1.1502-6 or any analogous state, local or foreign law by reason of having been a
member of any consolidated, combined or unitary group, other than in the current
affiliated group of which Columbus is the common parent corporation.

    (6) Except to the extent that the applicable statute of limitations has
expired, Columbus has made available to Key complete copies of: (i) all federal
and state income and franchise tax returns of Columbus for all periods since the
formation of Columbus, and (ii) all tax audit reports, work papers statements of
deficiencies, closing or other agreements received by Columbus or on its behalf
relating to Taxes, and

    (7) Columbus does not do business in or derive income from any state, local,
territorial or foreign taxing jurisdiction other than those for which Returns
have been furnished to Key.

  (b) Except as disclosed on Schedule 3.11(b) of the Columbus Disclosure
Schedule:

    (1) There is no audit of any Returns of Columbus by a governmental or taxing
authority in process, pending or, to the knowledge of Columbus, threatened
(formally or informally).

    (2) Except to the extent that the applicable statute of limitations has
expired and except as to matters that have been resolved, no deficiencies exist
or have been asserted (either formally or informally) or are expected to be
asserted with respect to Taxes of Columbus, and no notice (either formally or
informally) has been received by Columbus that it has not filed a Return or paid
Taxes required to be filed or paid by it.

    (3) Columbus is not a party to any pending action or proceeding for
assessment or collection of Taxes, nor has such action or proceeding been
asserted or threatened (either formally or informally) against it or any of its
assets, except to the extent that the applicable statute of limitations has
expired and except as to matters that have been resolved.

    (4) No waiver or extension of any statute of limitations is in effect with
respect to Taxes or Returns of Columbus.




                                                             A-14

<PAGE>



    (5) No action has been taken that would have the effect of deferring any
material liability for Taxes for Columbus from any period prior to the Effective
Time to any period after the Effective Time.

    (6) There are no requests for rulings, subpoenas or requests for information
pending with respect to Taxes of Columbus.

    (7) No power of attorney has been granted by Columbus, with respect to any
matter relating to Taxes.

    (8) Since January 1, 1997, Columbus has not been included in an affiliated
group of corporations, within the meaning of section 1504 of the Code, other
than in the current affiliated group of which Columbus is the common parent
corporation.

   (9) Columbus is not (nor has it ever been) a party to any tax sharing
agreement between affiliated corporations.

  (c) Except as disclosed on Schedule 3.11(c) of the Columbus Disclosure
Schedule:

    (1) Columbus has not made an election, and is not required to treat any
asset as owned by another person for federal income tax purposes or as tax-
exempt bond financed property or tax-exempt use property within the meaning of
section 168 of the Code.

    (2) Columbus has not issued or assumed any indebtedness that is subject to
section 279(b) of the Code.

    (3) Columbus has not entered into any compensatory agreements with respect
to the performance of services under which payment would result in a
nondeductible expense pursuant to Section 280G of the Code or an excise tax to
the recipient of such payment pursuant to Section 4999 of the Code.

    (4) No election has been made under Section 338 of the Code with respect to
Columbus and no action has been taken that would result in any income tax
liability to Columbus as a result of a deemed election within the meaning of
Section 338 of the Code.

    (5) No consent under Section 341(f) of the Code has been filed with respect
to Columbus.

    (6) Columbus has not agreed, nor is it required to make, any adjustment
under Code Section 481(a) by reason of a change in accounting method or
otherwise.

    (7) Columbus has not disposed of any property that is presently being
accounted for under the installment method.

    (8) Columbus is not a party to any interest rate swap, currency swap or
similar transaction.

    (9) Columbus has not participated in any international boycott as defined in
Code Section 999.

    (10) There are no outstanding balances of deferred gain or loss accounts
related to deferred intercompany transactions with respect to Columbus under
Treasury Regulations (S)(S) 1.1502-13 or 1.1502-14.



                                                             A-15

<PAGE>




    (11) Columbus has not made and will not make any election under Treasury
Regulation (S) 1.1502-20(g)(1) (or any similar provision) with respect to the
reattribution of net operating losses of Columbus.

    (12) There is no excess loss account under Treasury Regulation (S)1.1502- 19
with respect to the stock of Columbus or any subsidiary.

    (13) Columbus is not subject to any joint venture, partnership or other
arrangement or contract that is treated as a partnership for federal income tax
purposes.

    (14) Columbus has not made any of the foregoing elections and is not
required to apply any of the foregoing rules under any comparable state or local
income tax provisions.

    (15) Columbus does not have and has never had a permanent establishment in
any foreign country, as defined in any applicable tax treaty or convention
between the United States and such foreign country.

    (16) Except as provided in section 1445(a) of the Code with respect to
Columbus shareholders who are foreign persons, the Merger is not subject to the
tax withholding provisions of section 3406 of the Code, or of Subchapter A of
Chapter 3 of the Code, or of any other provision of law (exclusive of any backup
withholding with respect to cash payments in lieu of fractional shares).

  (d) To the extent the following information is contained therein, the tax
returns and tax work papers provided by Columbus to Key contained in all
material respects, as of the respective dates thereof, accurate and complete
information with respect to:

    (1) All material tax elections in effect with respect to Columbus;

    (2) The current tax basis of the assets of Columbus;

    (3) The net operating losses of Columbus by taxable year;

    (4) The net capital losses of Columbus;

    (5) The tax credit carry overs of Columbus;

    (6) The overall foreign losses of Columbus under section 904(f) of the Code
that is subject to recapture.

  (e) The tax returns and tax work papers provided by Columbus to Key contain
accurate and complete information in all material respects with respect to the
net operating losses, net operating loss carry forwards and other tax attributes
of Columbus, and the extent to which they are subject to any limitation under
Code sections 381, 382, 383, or 384, or any other provision of the Code or the
federal consolidated return regulations (or any predecessor provision of any
Code section or the regulations) and there is nothing that would prevent
Columbus from utilizing these net operating losses, net operating loss carry
forwards or other tax attributes as so limited if it had sufficient income.

  (f) (1) For purposes of this Agreement the term "Taxes" shall mean all taxes,



                                                             A-16

<PAGE>



however, denominated, including any interest, penalties or other additions to
tax that may become payable in respect thereof, imposed by any federal,
territorial, state, local or foreign government or any agency or political
subdivision of any such government, which taxes shall include, without limiting
the generality of the foregoing, all income or profits taxes, payroll and
employee withholding taxes, unemployment insurance, social security taxes, sales
and use taxes, ad valorem taxes, excise taxes, franchise taxes, gross receipts
taxes, business license taxes, occupation taxes, real and personal property
taxes, stamp taxes, environmental taxes, transfer taxes, workers' compensation,
Pension Benefit Guaranty Corporation premiums and other governmental charges,
and other obligations of the same or of a similar nature to any of the
foregoing, required to be paid, withheld or collected.

    (2) For the purposes of this agreement, the term "Returns" shall mean all
reports, estimates, declarations of estimated tax, information statements and
returns relating to, or required to be filed in connection with, any Taxes,
including information returns or reports with respect to backup withholding and
other payments to third parties.

    (3) All references to "Columbus" in this section 3.11 shall include all
subsidiaries of Columbus and where appropriate in this section 3.11, the
singular shall include the plural.

  SECTION 3.12. Tax Matters.

  (a) Neither Columbus nor, to the knowledge of Columbus, any of its affiliates
has taken or agreed to take any action that would prevent the Merger from
constituting a reorganization qualifying under the provisions of section 368(a)
of the Code.

  (b) There is no plan or intention by any stockholder of Columbus who owns five
percent or more of Columbus Common Stock, and to the knowledge of Columbus there
is no plan or intention on the part of any of the remaining stockholders of
Columbus, to sell, exchange or otherwise dispose of a number of shares of Key
Common Stock to be received in the Merger that would reduce the Columbus
stockholders' ownership of Key Common Stock to a number of shares having a
value, as of the Effective Time, of less than 80 percent of the value of all of
the Columbus Common Stock (including shares of Columbus Common Stock exchanged
for cash in lieu of fractional shares of Key Common Stock) outstanding
immediately prior to the Effective Time.

  (c) Immediately following the Merger, Columbus will hold at least 90 percent
of the fair market value of its net assets and at least 70 percent of the fair
market value of its gross assets held immediately prior to the Merger. For
purposes of this representation, amounts used by Columbus to pay Merger expenses
and all redemptions and distributions made by Columbus will be included as
assets of Columbus immediately prior to the Merger.

  (d) There is no intercorporate indebtedness existing between Columbus and Key
or between Columbus and Merger Sub that was issued, acquired or will be settled
at a discount.

  (e) Columbus is not an investment company as defined in section
368(a)(2)(F)(iii) and (iv) of the Code.

  (f) Columbus is not under the jurisdiction of a court in a title 11 or similar
case within the meaning of section 368(a)(3)(A) of the Code.




                                                             A-17

<PAGE>



  SECTION 3.13. Certain Business Practices. None of Columbus, any of its
subsidiaries or any directors, officers, agents or employees of Columbus or any
of its subsidiaries has (i) used any funds for unlawful contributions, gifts,
entertainment or other unlawful expenses relating to political activity, (ii)
made any unlawful payment to foreign or domestic government officials or
employees or to foreign or domestic political parties or campaigns or violated
any provision of the Foreign Corrupt Practices Act of 1977, as amended, or (iii)
made any other unlawful payment.

  SECTION 3.14. Environmental Matters. Except for matters disclosed in Schedule
3.14 to the Columbus Disclosure Schedule and except for matters that would not
result, individually or in the aggregate with all other such matters, in
liability to Columbus or any of its subsidiaries in excess of $500,000, (i) the
properties, operations and activities of Columbus and its subsidiaries are in
compliance with all applicable Environmental Laws; (ii) Columbus and its
subsidiaries and the properties and operations of Columbus and its subsidiaries
are not subject to any existing, pending or, to the knowledge of Columbus,
threatened action, suit, investigation, inquiry or proceeding by or before any
governmental authority under any Environmental Law; (iii) all notices, permits,
licenses, or similar authorizations, if any, required to be obtained or filed by
Columbus or any of its subsidiaries under any Environmental Law in connection
with any aspect of the business of Columbus or its subsidiaries, including
without limitation those relating to the treatment, storage, disposal or release
of a hazardous substance, have been duly obtained or filed and will remain valid
and in effect after the Merger, and Columbus and its subsidiaries are in
compliance with the terms and conditions of all such notices, permits, licenses
and similar authorizations; (iv) Columbus and its subsidiaries have satisfied
and are currently in compliance with all financial responsibility requirements
applicable to their operations and imposed by any governmental authority under
any Environmental Law, and Columbus and its subsidiaries have not received any
notice of noncompliance with any such financial responsibility requirements; (v)
to Columbus' knowledge, there are no physical or environmental conditions
existing on any property of Columbus or its subsidiaries or resulting from
Columbus' or such subsidiaries' operations or activities, past or present, at
any location, that would give rise to any on-site or off-site remedial
obligations imposed on Columbus or any of its subsidiaries under any
Environmental Laws; (vi) to Columbus' knowledge, since the effective date of the
relevant requirements of applicable Environmental Laws and to the extent
required by such applicable Environmental Laws, all hazardous substances
generated by Columbus and its subsidiaries have been transported only by
carriers authorized under Environmental Laws to transport such substances and
wastes, and disposed of only at treatment, storage and disposal facilities
authorized under Environmental Laws to treat, store or dispose of such
substances and wastes; (vii) there has been no exposure of any person or
property to hazardous substances or any pollutant or contaminant, nor has there
been any unauthorized release of hazardous substances, or any pollutant or
contaminant into the environment by Columbus or its subsidiaries or in
connection with their properties or operations, where such unauthorized release
could reasonably be expected to give rise to any claim against Columbus or any
of its subsidiaries for damages or compensation; and (viii) Columbus and its
subsidiaries have made available to Key all non-privileged internal and external
environmental audits and studies and all non-privileged correspondence on
substantial environmental matters in the possession of Columbus or its
subsidiaries relating to any of the current or former properties or operations
of Columbus and its subsidiaries. To Columbus' knowledge, except for matters
disclosed in Schedule 3.14 to the Columbus Disclosure Schedule, the operations
of each third party operator of any of Columbus or its subsidiaries' properties
are in compliance with



                                                             A-18

<PAGE>



the terms of this Section 3.14.

  For purposes of this Agreement, the term "Environmental Laws" shall mean any
and all laws, statutes, ordinances, rules, regulations or orders of any
Governmental Entity pertaining to health or the environment in effect as of the
Effective Time in any and all jurisdictions in which the party in question and
its subsidiaries own property or conduct business, including without limitation,
the Clean Air Act, as amended, the Comprehensive Environmental, Response,
Compensation, and Liability Act of 1980 ("CERCLA"), as amended, the Federal
Water Pollution Control Act, as amended, the Occupational Safety and Health Act
of 1970, as amended, the Resource Conservation and Recovery Act of 1976
("RCRA"), as amended, the Safe Drinking Water Act, as amended, the Toxic
Substances Control Act, as amended, the Hazardous & Solid Waste Amendments Act
of 1984, as amended, the Superfund Amendments and Reauthorization Act of 1986,
as amended, the Hazardous Materials Transportation Act, as amended, the Oil
Pollution Act of 1990 ("OPA"), any state laws implementing the foregoing federal
laws, and any state laws pertaining to the handling of oil and gas exploration
and production wastes or the use, maintenance and closure of pits and
impoundments, and all other environmental conservation or protection laws. For
purposes of this Agreement, the terms "hazardous substance" and "release" have
the meanings specified in CERCLA, and the term "disposal" has the meaning
specified in RCRA; provided, however, that to the extent the laws of the state
in which the property is located establish a meaning for "hazardous substance,"
"release," or "disposal" that is broader than that specified in either CERCLA or
RCRA, such broader meaning shall apply.

  SECTION 3.15. Vote Required. The only vote of the holders of any class or
series of Columbus capital stock necessary to approve the Merger and adopt this
Agreement is the affirmative vote of the holders of at least a majority of the
outstanding shares of Columbus Common Stock.

  SECTION 3.16. Brokers. Except as set forth in Schedule 3.16 to the Columbus
Disclosure Schedule, no broker, finder or investment banker is entitled to any
brokerage, finder's or other fee or commission in connection with the
transactions contemplated by this Agreement based upon arrangements made by or
on behalf of Columbus. Prior to the date of this Agreement, Columbus has made
available to Key a complete and correct copy of all agreements referenced in
Schedule 3.16 to the Columbus Disclosure Schedule pursuant to which such firm
will be entitled to any payment relating to the transactions contemplated by
this Agreement.

  SECTION 3.17. Insurance. Columbus and each of its subsidiaries are currently
insured, and during each of the past five calendar years have been insured, for
reasonable amounts against such risks as companies engaged in a similar business
would, in accordance with good business practice, customarily be insured.

  SECTION 3.18. Properties.

  (a) With respect to Columbus and its subsidiaries' non-oil and gas properties,
except for liens arising in the ordinary course of business after the date
hereof and properties and assets disposed of in the ordinary course of business
after the date of the most recent balance sheet contained in the Form 10-Q
referred to below, Columbus and its subsidiaries have good and marketable title
free and clear of all liens, the existence of which would have a Columbus
Material Adverse Effect, to all their material properties and assets, whether
tangible or intangible, real, personal or mixed, reflected in Columbus' most
recent consolidated balance sheet contained in Columbus' most recent Columbus
SEC Report on Form 10-Q filed prior to the date



                                                             A-19

<PAGE>



hereof as being owned by Columbus and its subsidiaries as of the date thereof or
purported to be owned on the date hereof. All buildings, and all fixtures,
equipment and other property and assets which are material to its business on a
consolidated basis, held under leases by any of Columbus or its subsidiaries are
held under valid instruments enforceable by Columbus or its subsidiaries in
accordance with their respective terms. Substantially all of Columbus' and its
subsidiaries' equipment in regular use has been well maintained and is in good
and serviceable condition, reasonable wear and tear excepted.

  (b) With respect to Columbus and its subsidiaries' oil and gas properties,
Schedule 3.18(b) to the Columbus Disclosure Schedule lists, as of the date of
this Agreement, all of the producing oil and gas properties owned by Columbus
and its subsidiaries (the "Columbus Oil and Gas Properties") and certain
information with respect thereto. Other than matters that do not have a Columbus
Material Adverse Effect:

    (i) Columbus and its subsidiaries have Defensible Title to all of the
Columbus Oil and Gas Properties, subject to and except for the Permitted
Encumbrances and as would be acceptable to a reasonably prudent operator of oil
and gas properties.

      (A) As used herein, the term "Defensible Title" shall mean as to the wells
and properties described in the column "Lease Name" in Schedule 3.18(b) to the
Columbus Disclosure Schedule (individually called a "Property"), such title as
will enable Columbus and its subsidiaries to receive not less than the net
revenue interests set forth on Schedule 3.18(b) to the Columbus Disclosure
Schedule of all hydrocarbons and other minerals produced from each Property, and
which will obligate Columbus and its subsidiaries to bear costs and expenses
relating to the maintenance, development, and operations of each Property not
greater than the working interests set forth on Schedule 3.18(b) to the Columbus
Disclosure Schedule.

      (B) As used herein, the term "Permitted Encumbrances" shall mean:

        (1) lessors' royalties, overriding royalties, division orders,
reversionary interests and net profits interests and similar burdens which do
not operate to reduce the net revenue interests in any Property below those set
forth on Schedule 3.18(b) to the Columbus Disclosure Schedule;

        (2) the terms and conditions of the oil, gas and mineral leases (the
"Columbus Leases") related to the Columbus Oil and Gas Properties and all
agreements, orders, instruments and declarations to which the Columbus Leases
are subject and that are customary and acceptable in the oil and gas industry in
the area of the particular property;

        (3) liens arising under operating agreements, pooling, unitization or
communitization agreements, and similar agreements of a type and nature
customary in the oil and gas industry and securing payment of amounts not yet
delinquent;

        (4) liens securing payments to mechanics and materialmen, and liens
securing payment of taxes or assessments, which liens are not yet delinquent or,
if delinquent, are being contested in good faith in the normal course of
business;

        (5) conventional rights of reassignment obligating Columbus and its
subsidiaries to reassign their interests in a portion of the Columbus Oil and
Gas Properties to a third party in the event Columbus and its subsidiaries
intend to release or abandon such interest;



                                                             A-20

<PAGE>




        (6) calls on or preferential rights to purchase production at not less
than prevailing prices;

        (7) covenants, conditions, and other terms to which the Columbus Oil and
Gas Properties were subject when acquired by Columbus and its subsidiaries and
are not such as to materially interfere with the operation, value, use and
enjoyment of the Columbus Oil and Gas Properties;

        (8) rights reserved to or vested in any Governmental Entity to control
or regulate any of the Columbus Oil and Gas Properties in any manner, and all
applicable laws, rules, regulations and orders of any such Governmental Entity;

        (9) easements, rights-of-way, servitudes, permits, surface leases, and
other surface uses on, over or in respect of any of the Columbus Oil and Gas
Properties that are not such as to materially interfere with the operation,
value or use thereof; and

        (10) all other liens, charges, encumbrances, limitations, obligations,
defects and irregularities affecting any portion of the Columbus Oil and Gas
Properties which would not have a material adverse effect on the operation,
value, use and enjoyment thereof.

      (ii) Except as described in Schedule 3.18(b)(ii) to the Columbus
Disclosure Schedule, the Columbus Leases are in full force and effect, are valid
and subsisting, cover the entire estates they purport to cover and contain no
express provisions that require the drilling of additional wells or other
material development operations in order to earn or to continue to hold all or
any portion of the Columbus Oil and Gas Properties, and to its knowledge,
Columbus has not been advised directly or indirectly by any lessor under any
Columbus Lease or by any other party of a default under any such Lease or of any
requirements or demands to drill additional wells on any of the lands included
within any of the Columbus Oil and Gas Properties.

 (iii) Neither Columbus nor any of its subsidiaries is in default under any
contract or agreement pertaining to the Columbus Oil and Gas Properties. Except
as specifically indicated on Schedule 3.18(b)(iii) to the Columbus Disclosure
Schedule and except for hydrocarbon sales contracts with a term not greater than
six months, no hydrocarbons produced from the Columbus Oil and Gas Properties
are subject to a sales contract or other agreement relating to the marketing of
hydrocarbons, and no person has any call upon, option to purchase or similar
rights with respect to the Columbus Oil and Gas Properties or the rights
therefrom.

      (iv) All royalties, rentals and other payments due under the Columbus
Leases have been properly and timely paid, and all conditions necessary to keep
the Columbus Leases in force have been fully performed.

      (v) Except for gas balancing agreements containing customary provisions,
neither Columbus nor any of its subsidiaries is obligated, by virtue of a
prepayment arrangement, a "take or pay" arrangement, a production payment or any
other arrangement, to deliver hydrocarbons produced from the Columbus Oil and
Gas Properties at some future time without then or thereafter receiving full
payment therefor.

      (vi) Except as set forth on Schedule 3.18(b)(vi) to the Columbus
Disclosure Schedule, with respect to Authorizations for Expenditure executed on
or after



                                                             A-21

<PAGE>



May 31, 2000, and covering expenditures exceeding $50,000 attributable to
Columbus or its subsidiaries' interest,

 (1) there are no outstanding calls under Authorizations for Expenditures for
payments which are due or which Columbus has committed to make which have not
been made;

    (2) there are no material operations with respect to which Columbus has
become a non-consenting party where the effect of such non-consent is not
disclosed on Schedule 3.18(b) to the Columbus Disclosure Schedule, and

    (3) there are no commitments for the expenditure of funds for drilling or
other capital projects other than projects with respect to which the operator is
not required under the applicable operating agreement to seek consent.

      (vii) Except as set forth on Schedule 3.18(b)(vii) to the Columbus
Disclosure Schedule, there are no Columbus Oil and Gas Properties to which
Columbus or any of its subsidiaries is either "over-produced" or "under-
produced" which singly or in the aggregate would have a Columbus Material
Adverse Effect.

  SECTION 3.19. Certain Contracts and Restrictions. Other than agreements,
contracts or commitments listed elsewhere in the Columbus Disclosure Schedule,
Schedule 3.19 to the Columbus Disclosure Schedule lists, as of the date of this
Agreement, each agreement, contract or commitment (including any amendments
thereto) to which Columbus or any of its subsidiaries is a party or by which
Columbus or any of its subsidiaries is bound (i) involving consideration during
the next twelve months in excess of $50,000 or (ii) which is otherwise material
to the financial condition, results of operations or business of Columbus and
its subsidiaries, taken as a whole. As of the date of this Agreement and except
as indicated on the Columbus Disclosure Schedule, (i) Columbus has fully
complied in all material respects with all the terms and conditions of all
agreements, contracts and commitments listed in the Columbus Disclosure Schedule
and all such agreements, contracts and commitments are in full force and effect,
(ii) Columbus has no knowledge of any defaults thereunder or any cancellations
or modifications thereof, and (iii) such agreements, contracts and commitments
are not subject to any memorandum or other written document or understanding
permitting cancellation.

  SECTION 3.20. Easements. The business of Columbus and its subsidiaries has
been operated in a manner that does not violate the material terms of any
easements, rights of way, permits, servitudes, licenses and similar rights
relating to real property used by Columbus and its subsidiaries in its business
(collectively, "Columbus Easements") except for Environmental Matters that are
covered in Section 3.14 and violations that have not resulted and will not
result in a Columbus Material Adverse Effect. All material Columbus Easements
are valid and enforceable and grant the rights purported to be granted thereby
and all rights necessary thereunder for the current operation of such business.

  SECTION 3.21. Futures Trading and Fixed Price Exposure. Except as set forth on
Schedule 3.21 to the Columbus Disclosure Schedule, none of Columbus or any of
its subsidiaries engages in any natural gas or other futures or options trading
or is a party to any price swaps, hedges, futures or similar instruments.

  SECTION 3.22.Information Supplied. Without limiting any of the representations
and warranties contained herein, no representation or warranty of Columbus and
no statement by Columbus or other information contained in the Columbus
Disclosure



                                                             A-22

<PAGE>



Schedule or any document incorporated therein by reference or delivered by
Columbus to Key since April 11, 2000, as of the date of such representation,
warranty, statement or document, contains or contained any untrue statement of
material fact, or, at the date thereof, omits or omitted to state a material
fact necessary in order to make the statements contained therein, in light of
the circumstances under which such statements are or were made, not misleading.

  SECTION 3.23. Opinion of Financial Advisor. Columbus has received the opinion
of Arthur Andersen LLP to the effect that, as of the date of delivery of such
opinion, the Key Common Stock to be received by the holders of Columbus Common
Stock in the Merger is fair, from a financial point of view, to such holders.
Columbus will promptly deliver to Key a true and complete written copy of such
opinion.

                                   ARTICLE IV

                 REPRESENTATIONS AND WARRANTIES OF KEY COMPANIES

         THE KEY COMPANIES HEREBY REPRESENT AND WARRANT TO COLUMBUS THAT:

  SECTION 4.01. Organization and Qualification. Each of the Key Companies is a
corporation duly organized, validly existing and in good standing under the laws
of the State of Delaware and has all requisite corporate power and authority to
own, lease and operate its properties and to carry on its business as it is now
being conducted and is duly qualified and in good standing to do business in
each jurisdiction in which the nature of the business conducted by it or the
ownership or leasing of its properties makes such qualification necessary, other
than where the failure to be so duly qualified and in good standing would not
have a Key Material Adverse Effect. The term "Key Material Adverse Effect" as
used in this Agreement shall mean any change or effect that, individually or
when taken together with all such other changes or effects, would be materially
adverse to the financial condition, results of operations or business of Key.
Except as set forth in Schedule 4.01 to the Key Disclosure Schedule, Key has no
subsidiaries and does not own an equity interest in any partnership or joint
venture arrangement or business entity that is material to the financial
condition, results of operations or business of Key.

  SECTION 4.02. Charter and Bylaws. Key has heretofore made available to
Columbus a complete and correct copy of the charter and bylaws, as amended or
restated, of each of the Key Companies. None of the Key Companies is in
violation of any of the provisions of its charter or any material provision of
its bylaws.

  SECTION 4.03. Capitalization.

  (a) The authorized capital stock of Key consists of (i) 50,000,000 shares of
Key Common Stock, of which, as of the date of this Agreement, (1) 12,274,493
shares were issued and outstanding, (2) 305,546 shares were held in treasury by
Key and (3) 1,871,667 shares were reserved for future issuance pursuant to
outstanding stock options ; and (ii) 15,000,000 shares of preferred stock ("Key
Preferred Stock"), of which no shares are issued and outstanding. Except as
described in this Section 4.03 or in Schedule 4.03(a) of the disclosure schedule
delivered to Columbus by Key on the date hereof (the "Key Disclosure Schedule"),
as of the date of this Agreement, no shares of capital stock of Key are reserved
for any purpose. The outstanding shares of capital stock of Key are duly
authorized, validly issued, fully paid and nonassessable, and have not been
issued in violation of (nor are any of the authorized shares of capital stock of
Key subject to) any preemptive or similar



                                                             A-23

<PAGE>



rights created by statute, the charter or bylaws of Key, or any agreement to
which Key is a party or bound.

  (b) Except as set forth in Section 4.03(a) above or in Schedule 4.03(b)(i) to
the Key Disclosure Schedule, there are no options, warrants or other rights
(including registration rights), agreements, arrangements or commitments of any
character to which Key is a party relating to the issued or unissued capital
stock of Key or obligating Key to grant, issue or sell any shares of the capital
stock of Key, by sale, lease, license or otherwise. Except as set forth in
Schedule 4.03(b)(ii) to the Key Disclosure Schedule, there are no obligations,
contingent or otherwise, of Key to (i) repurchase, redeem or otherwise acquire
any shares of Key Common Stock or other capital stock of Key; or (ii) provide
material funds to, or make any material investment in (in the form of a loan,
capital contribution or otherwise), or provide any guarantee with respect to the
obligations of, any person. Except as described in Schedule 4.03(b)(iii) to the
Key Disclosure Schedule, Key (x) does not directly or indirectly own, (y) has
not agreed to purchase or otherwise acquire or (z) does not hold any interest
convertible into or exchangeable or exercisable for, 5% or more of the capital
stock of any corporation, partnership, joint venture or other business
association or entity. Except as set forth in Schedule 4.03(b)(iv) to the Key
Disclosure Schedule, there are no agreements, arrangements or commitments of any
character (contingent or otherwise) pursuant to which any person is or may be
entitled to receive any payment based on the revenues or earnings, or calculated
in accordance therewith, of Key. Except as set forth in Schedule 4.03(b)(v),
there are no voting trusts, proxies or other agreements or understandings to
which Key is a party or by which Key is bound with respect to the voting of any
shares of capital stock of Key.

  (c) The authorized capital stock of Merger Sub consists of 1,000 shares of
common stock ("Merger Sub Common Stock"). As of the date of this Agreement,
1,000 shares of Merger Sub Common Stock were issued and outstanding and held by
Key, all of which are duly authorized, validly issued, fully paid and
nonassessable and not subject to preemptive rights created by statute, Merger
Sub's charter or bylaws or any agreement to which Merger Sub is a party or is
bound.

  (d) The shares of Key Common Stock to be issued pursuant to the Merger (i)
will be duly authorized, validly issued, fully paid and nonassessable and not
subject to preemptive rights created by statute, Key's charter or bylaws or any
agreement to which Key is a party or is bound and (ii) will, when issued, be
registered under the Securities Act and the Exchange Act and registered or
exempt from registration under applicable Blue Sky Laws and (iii) listed on the
New York Stock Exchange.

  SECTION 4.04. Authority. Each of the Key Companies has all requisite corporate
power and authority to execute and deliver this Agreement, to perform its
obligations hereunder and to consummate the transactions contemplated hereby.
The execution and delivery of this Agreement by each of the Key Companies and
the consummation by each of the Key Companies of the transactions contemplated
hereby have been duly authorized by all necessary corporate action and no other
corporate proceedings on the part of any of the Key Companies are necessary to
authorize this Agreement or to consummate the transactions contemplated hereby.
This Agreement has been duly executed and delivered by each of the Key Companies
and, assuming the due authorization, execution and delivery thereof by Columbus,
constitutes the legal, valid and binding obligation of each of the Key
Companies, subject to bankruptcy, insolvency, fraudulent conveyance,
reorganization, moratorium and other statutes or rules of law affecting the
rights and remedies of creditors and secured parties generally and general
principles of equity, regardless of whether applied in proceedings in equity or
at law.



                                                             A-24

<PAGE>





  SECTION 4.05. No Conflict; Required Filings and Consents.

  (a) The execution and delivery of this Agreement by each of the Key Companies
does not, and the consummation of the transactions contemplated hereby will not
(i) conflict with or violate the charter or bylaws, or the equivalent
organizational documents, in each case as amended or restated, of Key, (ii)
conflict with or violate any Laws applicable to Key or by which any of its
properties is bound or subject, or (iii) result in any breach of or constitute a
default (or an event that with notice or lapse of time or both would become a
default) under, or give to others any rights of termination, amendment,
acceleration or cancellation of, or result in the creation of a lien or
encumbrance on any of the properties or assets of Key pursuant to, any note,
bond, mortgage, indenture, contract, agreement, lease, license, permit,
franchise or other instrument or obligation to which Key is a party or by or to
which Key or any of its properties is bound or subject, except for any such
conflicts or violations described in clause (ii) or breaches, defaults, events,
rights of termination, amendment, acceleration or cancellation or liens or
encumbrances described in clause (iii) that would not have a Key Material
Adverse Effect.

  (b) The execution and delivery of this Agreement by each of the Key Companies
does not, and the consummation of the transactions contemplated hereby will not,
require any of the Key Companies to obtain any consent, license, permit,
approval, waiver, authorization or order of, or to make any filing with or
notification to, any Governmental Entities, except (i) for applicable
requirements, if any, of the Securities Act, the Exchange Act and Blue Sky Laws
and the filing and recordation of appropriate merger documents as required by
Delaware Law and Colorado Law, and (ii) where the failure to obtain such
consents, licenses, permits, approvals, waivers, authorizations or orders, or to
make such filings or notifications, would not, either individually or in the
aggregate, prevent any of the Key Companies from performing its obligations
under this Agreement and would not have a Key Material Adverse Effect.

  SECTION 4.06. Permits; Compliance. Except as disclosed in Schedule 4.17 of the
Key Disclosure Schedule, as of the date of this Agreement, Key and to Key's
knowledge each third party operator of any of Key's properties, is in possession
of all franchises, grants, authorizations, licenses, permits, easements,
variances, exemptions, consents, certificates, approvals and orders necessary to
own, lease and operate its properties and to carry on its business as it is now
being conducted (collectively, the "Key Permits"), and there is no action,
proceeding or investigation pending or, to the knowledge of Key, threatened
regarding suspension or cancellation of any of the Key Permits, except where the
failure to possess, or the suspension or cancellation of, such Key Permits would
not have a Key Material Adverse Effect. Except as disclosed in Schedule 4.17 of
the Key Disclosure Schedule, Key is not in conflict with, or in default or
violation of (a) any Law applicable to Key or by or to which any of its
properties is bound or subject or (b) any of the Key Permits, except for any
such conflicts, defaults or violations described in the Key SEC Reports filed
prior to the date hereof or which would not have a Key Material Adverse Effect.
During the period commencing on January 1, 1999 and ending on the date hereof,
Key has not received from any Governmental Entity any written notification with
respect to possible conflicts, defaults or violations of Laws, except for
written notices relating to possible conflicts, defaults or violations described
in the Key SEC Reports filed prior to the date hereof or that would not have a
Key Material Adverse Effect.



                                                             A-25

<PAGE>




  SECTION 4.07. Reports; Financial Statements.

  (a) Since December 31, 1997, Key has filed (i) all forms, reports, statements
and other documents required to be filed with (A) the SEC, including, without
limitation, (1) all Annual Reports on Form 10-K, (2) all Quarterly Reports on
Form 10-Q, (3) all proxy statements relating to meetings of stockholders
(whether annual or special), (4) all Current Reports on Form 8-K and (5) all
other reports, schedules, registration statements or other documents
(collectively, the "Key SEC Reports") and (B) any applicable state securities
authorities and (ii) all forms, reports, statements and other documents required
to be filed with any other applicable federal or state regulatory authorities,
except as disclosed in Schedule 4.17 of the Key Disclosure Schedule and except
where the failure to file any such forms, reports, statements or other documents
would not have a Key Material Adverse Effect (all such forms, reports,
statements and other documents in clauses (i) and (ii) of this Section 4.07(a)
being referred to herein, collectively, as the "Key Reports"). The Key Reports,
including all Key Reports filed after the date of this Agreement and prior to
the Effective Time (x) were or will be prepared in all material respects in
accordance with the requirements of applicable Law (including, with respect to
the Key SEC Reports, the Securities Act and the Exchange Act, as the case may
be, and the rules and regulations of the SEC thereunder applicable to such Key
SEC Reports) and (y) did not at the time they were filed, or will not at the
time they are filed, contain any untrue statement of a material fact or omit to
state a material fact required to be stated therein or necessary in order to
make the statements therein, in the light of the circumstances under which they
were made, not misleading.

  (b) Each of the consolidated financial statements (including, in each case,
any related notes thereto) contained in the Key SEC Reports filed prior to the
Effective Time (i) have been or will be prepared in accordance with the
published rules and regulations of the SEC and generally accepted accounting
principles applied on a consistent basis throughout the periods involved (except
(A) to the extent required by changes in generally accepted accounting
principles and (B) with respect to Key SEC Reports filed prior to the date of
this Agreement, as may be indicated in the notes thereto) and (ii) fairly
present or will fairly present the financial position of Key as of the
respective dates thereof and the results of operations and cash flows for the
periods indicated (including reasonable estimates of normal and recurring
year-end adjustments), except that (x) any unaudited interim financial
statements were or will be subject to normal and recurring year-end adjustments
and (y) any pro forma financial information contained in such financial
statements is not necessarily indicative of the financial position of Key as of
the respective dates thereof and the results of operations and cash flows for
the periods indicated.

  SECTION 4.08. Absence of Certain Changes or Events. Except as disclosed in the
Key SEC Reports filed prior to the date of this Agreement or as contemplated by
this Agreement or as set forth in Schedule 4.08 to the Key Disclosure Schedule,
since March 31, 2000, Key has conducted its business only in the ordinary course
and in a manner consistent with past practice, and there has not been: (i) any
material damage, destruction or loss (whether or not covered by insurance) with
respect to any material assets of Key; (ii) any material change by Key in its
accounting methods, principles or practices; (iii) any declaration, setting
aside or payment of any dividends or distributions in respect of shares of Key
Common Stock or any redemption, purchase or other acquisition by Key of any of
Key's securities; (iv) any increase in the benefits under, or the establishment
or amendment of, any bonus,



                                                             A-26

<PAGE>



insurance, severance, deferred compensation, pension, retirement, profit
sharing, stock option (including, without limitation, the granting of stock
options, stock appreciation rights, performance awards, or restricted stock
awards), stock purchase or other employee benefit plan, or any increase in the
compensation payable or to become payable to directors, officers or employees of
Key; (v) any revaluation by Key of any of its assets, including the writing down
of the value of inventory or the writing down or off of notes or accounts
receivable, other than in the ordinary course of business and consistent with
past practices; or (vi) a Key Material Adverse Effect.

  SECTION 4.09. Absence of Litigation. Except as disclosed in the Key SEC
Reports filed prior to the date of this Agreement or as set forth in Schedule
4.09 to the Key Disclosure Schedule, there is no claim, action, suit,
litigation, proceeding, arbitration or, to the knowledge of Key, investigation
of any kind, at law or in equity (including actions or proceedings seeking
injunctive relief), pending or, to the knowledge or Key, threatened against Key
or any properties or rights of Key (except for claims, actions, suits,
litigation, proceedings, arbitrations or investigations which would not have a
Key Material Adverse Effect) and Key is not subject to any continuing order of,
consent decree, settlement agreement or other similar written agreement with,
or, to the knowledge of Key, continuing investigation by, any Governmental
Entity, or any judgment, order, writ, injunction, decree or award of any
Governmental Entity or arbitrator, including, without limitation, cease-and-
desist or other orders, except for matters which would not have a Key Material
Adverse Effect.

  SECTION 4.10. Tax Matters. None of the Key Companies nor, to the knowledge of
Key, any of their affiliates has taken or agreed to take any action that would
prevent the Merger from constituting a reorganization qualifying under the
provisions of section 368(a) of the Code.

  SECTION 4.11. Vote Required. No vote of the holders of any class or series of
Key capital stock is necessary to approve the issuance of the Key Common Stock
in the Merger.

  SECTION 4.12. Brokers. No broker, finder or investment banker is entitled to
any brokerage, finder's or other fee or commission in connection with the
transactions contemplated by this Agreement based upon arrangements made by or
on behalf of any of the Key Companies.

  SECTION 4.13. Information Supplied. Without limiting any of the
representations and warranties contained herein, no representation or warranty
of the Key Companies and no statement by the Key Companies or other information
contained in the Key Disclosure Schedule or any document incorporated therein by
reference or delivered by Key to Columbus since April 11, 2000, as of the date
of such representation, warranty, statement or document, contains or contained
any untrue statement of material fact, or, at the date thereof, omits or omitted
to state a material fact necessary in order to make the statements contained
therein, in light of the circumstances under which such statements are or were
made, not misleading.

  SECTION 4.14. Employee Benefit Plans; Labor Matters.

  (a) Schedule 4.14(a) to the Key Disclosure Schedule sets forth each employee
benefit plan (as such term is defined in ERISA section 3(3)) maintained or
contributed to by Key or any member of its ERISA Group and any other retirement,
pension, stock option, stock appreciation right, profit sharing, incentive



                                                             A-27

<PAGE>



compensation, deferred compensation, savings, thrift, vacation pay, severance
pay, or other employee compensation or benefit plan, agreement, practice, or
arrangement, whether written or unwritten, whether or not legally binding,
maintained or contributed to by Key or any member of its ERISA Group
(collectively, the "Key Benefit Plans"). For purposes of this Agreement, "ERISA
Group" means a controlled or affiliated group within the meaning of Code section
414(b), (c), (m), or (o) of which Key is a member. Key has made available to
Columbus correct and complete copies of all Key Benefit Plans (including a
detailed written description of any Key Benefit Plan that is unwritten,
including a description of eligibility criteria, participation, vesting,
benefits, funding arrangements and assets and any other provisions relating to
Key) and, with respect to each Key Benefit Plan, a copy of each of the
following, to the extent each is applicable to each Key Benefit Plan: (i) the
most recent favorable determination letter, (ii) materials submitted to the
Internal Revenue Service in support of a pending determination letter request,
(iii) the most recent letter issued by the Internal Revenue Service recognizing
tax exemption, (iv) each insurance contract, trust agreement, or other funding
vehicle, (v) the three most recently filed Forms 5500 plus all schedules and
attachments, (vi) the three most recent actuarial valuations, and (vii) each
summary plan description or other general explanation or communication
distributed or otherwise provided to employees with respect to each Key Benefit
Plan during the past five years that describes the terms of the Key Benefit
Plan.

  (b) With respect to the Key Benefit Plans, no event has occurred and, to the
knowledge of Key, there exists no condition or set of circumstances, in
connection with which Key or any member of its ERISA Group could reasonably be
expected to be subject to any liability under the terms of such Key Benefit
Plans, ERISA, the Code or any other applicable Law which would have a Key
Material Adverse Effect. Except as otherwise set forth on Schedule 4.14(b) to
the Key Disclosure Schedule,

    (i) Each Key Benefit Plan has at all times been in compliance, in form and
in operation, in all material respects with all applicable requirements of law
and regulations, including without limitation ERISA. Each Key Benefit Plan that
is intended to be a qualified plan has received a favorable determination letter
from the Internal Revenue Service or is a standardized master or prototype plan
that is subject to a notification letter issued by the National Office of the
Internal Revenue Service; nothing has occurred since the date of the most recent
favorable determination letter or notification letter that would cause the loss
of the Key Benefit Plan's qualification; and each such Key Benefit Plan has at
all times been in compliance, in form and in operation, in all material respects
with the applicable requirements of the Internal Revenue Code and the applicable
Treasury Regulations.

    (ii) With respect to each Key Benefit Plan (including any benefit plan that
has been terminated prior to the date of this Agreement (a "Terminated Plan")),
there are no actions, suits, grievances, arbitrations or other manner of
litigation, or claim with respect to any Key Benefit Plan (except for routine
claims for benefits made in the ordinary course of plan administration for which
plan administrative procedures have not been exhausted) pending, threatened or
imminent against or with respect to any Key Benefit Plan, any plan sponsor, or
any fiduciary (as such term is defined in Section 3(21) of ERISA) of such Key
Benefit Plan or Terminated Plan, and Key has no knowledge of any facts that
could reasonably be expected to give rise to any action, suit, grievance,
arbitration or other manner of litigation, or action.

   (iii) All contributions required to be made to the Key Benefit Plans pursuant
to their terms and provisions or required by applicable law have been made
timely.



                                                             A-28

<PAGE>




    (iv) Neither Key nor any member of its ERISA Group has ever maintained,
contributed to, or been obligated to contribute to any plan that is subject to
Title IV of ERISA or the minimum funding requirements of Section 412 of the
Code. Neither Key nor any member of its ERISA Group has ever contributed to,
been obligated to contribute to, or incurred any liability to a multiemployer
plan (as such term in defined in Section 3(37) of ERISA).

    (v) Neither Key nor any party in interest (as such term is defined in ERISA
section 3(14)) nor any disqualified person has engaged in any prohibited
transaction within the meaning of ERISA section 406 or Code section 4975 that
could reasonably be expected to result in a Key Material Adverse Effect.

    (vi) With respect to the Key Benefit Plans and the employees and directors
of Key, the consummation of the transactions contemplated by this Agreement will
not give rise to any acceleration of vesting of payments or options, the
acceleration of the time of making any payments, or the making of any payments,
which in the aggregate would result in an "excess parachute payment" within the
meaning of Section 280G of the Code and the imposition of the excise tax under
Section 4999 of the Code.

  (c) Neither Key nor any member of its ERISA Group is or has ever been a party
to any collective bargaining or other labor union contracts. No collective
bargaining agreement is being negotiated by Key or any of its subsidiaries.
There is no pending or threatened labor dispute, strike or work stoppage against
Key or any of its subsidiaries which could reasonably be expected to interfere
with the respective business activities of Key or any of its subsidiaries. To
the knowledge of Key, none of Key, any of its subsidiaries or any of their
respective representatives or employees has committed any unfair labor practices
in connection with the operation of the respective businesses of Key or its
subsidiaries, and there is no pending or threatened charge or complaint against
Key or any of its subsidiaries by the National Labor Relations Board or any
comparable state agency.

  (d) Except as disclosed in Schedule 4.14(a) to the Key Disclosure Schedule,
neither Key nor any of its subsidiaries is a party to or is bound by any
severance agreements, programs or policies. Schedule 4.14(d) to the Key
Disclosure Schedule sets forth, and Key has made available to Columbus true and
correct copies of (i) all employment agreements with officers of Key or its
subsidiaries obligating Key to make annual cash payments in an amount exceeding
$50,000; (ii) all agreements with consultants of Key or its subsidiaries; (iii)
all non-competition agreements with Key or a subsidiary executed by officers of
Key; and (iv) all plans, programs, agreements and other arrangements of Key or
its subsidiaries with or relating to its directors.

  (e) No Key Benefit Plan provides retiree medical or retiree life insurance
benefits to any person and neither Key nor any of its subsidiaries is
contractually or otherwise obligated (whether or not in writing) to provide any
person with life insurance or medical benefits upon retirement or termination of
employment, other than as required by the provisions of Sections 601 through 608
of ERISA and Section 4980B of the Code and each such Key Benefit Plan or
arrangement may be amended or terminated by Key or its subsidiaries at any time
without liability.

  (f) Except as contemplated by this Agreement or as set forth in Schedule
4.14(f), Key has not amended, or taken any other actions with respect to any of
the Key Benefit Plans or any of the plans, programs, agreements, policies or
other



                                                             A-29

<PAGE>



arrangements described in Section 4.14(d) of this Agreement since March 31,
2000.

  (g) With respect to each Key Benefit Plan that is a "group health plan" within
the meaning of Section 5000(b) of the Code, each such Key Benefit Plan complies
and has complied in all material respects with the requirements of Part 6 of
Title I of ERISA and Sections 4980B and 5000 of the Code, or, if ERISA and the
Code do not apply, the requirements of applicable state law.

  (h) Key's federal income tax deduction for compensation paid or payable by Key
to employees covered by Section 162(m) of the Code has not been, and will not
be, limited by Section 162(m) of the Internal Revenue Code.

  (i) Any Key Benefit Plan that has been terminated prior to the date of this
Agreement was terminated in accordance with its provisions and applicable law
and each such Key Benefit Plan that was intended to be a qualified plan has
received a determination letter from the Internal Revenue Service to the effect
that the termination does not adversely affect such Key Benefit Plan's
qualification.

  SECTION 4.15. Taxes.

  (a) (1) Except to the extent that the applicable statute of limitations has
expired, all Returns required to be filed by or on behalf of Key have been duly
filed on a timely basis and such Returns (including all attached statements and
schedules) are true, complete and correct in all material respects. Except to
the extent that the applicable statute of limitations has expired, all Taxes
shown to be payable on the Returns or on subsequent assessments with respect
thereto have been paid in full on a timely basis, and no other Taxes are
currently due and payable by Key with respect to items or periods covered by
such Returns (whether or not shown on or reportable on such Returns) or with
respect to any period prior to the Effective Time.

    (2) Key has withheld and paid over all Taxes required to have been withheld
and paid over (including any estimated taxes), and has complied in all material
respects with all information reporting and backup withholding requirements,
including maintenance of required records with respect thereto, in connection
with amounts paid or owing to any employee, creditor, independent contractor, or
other third party.

    (3) Key has disclosed on its income tax returns all positions taken therein
that could give rise to a substantial understatement penalty within the meaning
of Code Section 6662.

    (4) There are no liens on any of the assets of Key with respect to Taxes,
other than liens for Taxes not yet due and payable or for Taxes that are being
contested in good faith through appropriate proceedings and for which
appropriate reserves have been established.

    (5) Key does not have any liability under Treasury Regulation (S) 1.1502- 6
or any analogous state, local or foreign law by reason of having been a member
of any consolidated, combined or unitary group, other than in the current
affiliated group of which Key is the common parent corporation.

    (6) Except to the extent that the applicable statute of limitations has
expired, Key has made available to Columbus complete copies of: (i) all federal
and state income and franchise tax returns of Key for all periods since the
formation of Key,



                                                             A-30

<PAGE>



and (ii) all tax audit reports, work papers statements of deficiencies, closing
or other agreements received by Key or on its behalf relating to Taxes, and

    (7) Key does not do business in or derive income from any state, local,
territorial or foreign taxing jurisdiction other than those for which Returns
have been furnished to Columbus.

  (b) Except as disclosed on Schedule 4.15(b) of the Key Disclosure Schedule:

    (1) There is no audit of any Returns of Key by a governmental or taxing
authority in process, pending or, to the knowledge of Key, threatened (formally
or informally).

    (2) Except to the extent that the applicable statute of limitations has
expired and except as to matters that have been resolved, no deficiencies exist
or have been asserted (either formally or informally) or are expected to be
asserted with respect to Taxes of Key, and no notice (either formally or
informally) has been received by Key that it has not filed a Return or paid
Taxes required to be filed or paid by it.

    (3) Key is not a party to any pending action or proceeding for assessment or
collection of Taxes, nor has such action or proceeding been asserted or
threatened (either formally or informally) against it or any of its assets,
except to the extent that the applicable statute of limitations has expired and
except as to matters that have been resolved.

    (4) No waiver or extension of any statute of limitations is in effect with
respect to Taxes or Returns of Key.

    (5) No action has been taken that would have the effect of deferring any
material liability for Taxes for Key from any period prior to the Effective Time
to any period after the Effective Time.

    (6) There are no requests for rulings, subpoenas or requests for information
pending with respect to Key.

    (7) No power of attorney has been granted by Key, with respect to any matter
relating to Taxes.

    (8) Key has never been included in an affiliated group of corporations,
within the meaning of section 1504 of the Code, other than in the current
affiliated group of which Key is the common parent corporation.

    (9) Key is not (nor has it ever been) a party to any tax sharing agreement
between affiliated corporations.

    (10) The amount of liability for unpaid Taxes of Key for all periods ending
on or before the Effective Time will not, in the aggregate, materially exceed
the amount of the current liability accruals for Taxes, as such accruals are
reflected on the balance sheet of Key as of the Closing Date.

  (c) Except as disclosed on Schedule 4.15(c) of the Key Disclosure Schedule:

    (1) Key has not made an election, and is not required to treat any asset as
owned by another person for federal income tax purposes or as tax-exempt bond
financed property or tax-exempt use property within the meaning of section 168
of



                                                             A-31

<PAGE>



the Code.

    (2) Key has not issued or assumed any indebtedness that is subject to
section 279(b) of the Code.

    (3) No election has been made under Section 338 of the Code with respect to
Key and no action has been taken that would result in any income tax liability
to Key as a result of a deemed election within the meaning of Section 338 of the
Code.

    (4) No consent under Section 341(f) of the Code has been filed with respect
to Key.

    (5) Key has not agreed, nor is it required to make, any adjustment under
Code Section 481(a) by reason of a change in accounting method or otherwise.

    (6) Key has not disposed of any property that is presently being accounted
for under the installment method.

    (7) Key is not a party to any interest rate swap, currency swap or similar
transaction.

    (8) Key has not participated in any international boycott as defined in Code
Section 999.

    (9) There are no outstanding balances of deferred gain or loss accounts
related to deferred intercompany transactions with respect to Key under Treasury
Regulations (S)(S) 1.1502-13 or 1.1502-14.

    (10) Key has not made and will not make any election under Treasury
Regulation (S) 1.1502-20(g)(1) (or any similar provision) with respect to the
reattribution of net operating losses of Key.

    (11) There is no excess loss account under Treasury Regulation (S)1.1502- 19
with respect to the stock of Key.

    (12) Key is not subject to any joint venture, partnership or other
arrangement or contract that is treated as a partnership for federal income tax
purposes.

    (13) Key has not made any of the foregoing elections and is not required to
apply any of the foregoing rules under any comparable state or local income tax
provisions.

    (14) Key does not have and has never had a permanent establishment in any
foreign country, as defined in any applicable tax treaty or convention between
the United States and such foreign country.

    (15) The Merger is not subject to the tax withholding provisions of section
3406 of the Code, or of Subchapter A of Chapter 3 of the Code, or of any other
provision of law.

  (d) To the extent the following information is contained therein, the tax
returns and tax work papers made available by Key to Columbus contained in all
material respects, as of the respective dates thereof, accurate and complete
information with respect to:




                                                             A-32

<PAGE>



    (1) All material tax elections in effect with respect to Key;

    (2) The current tax basis of the assets of Key;

    (3) The current and accumulated earnings and profits of Key;

    (4) The net operating losses of Key by taxable year;

    (5) The net capital losses of Key;

    (6) The tax credit carry overs of Key;

    (7) The overall foreign losses of Key under section 904(f) of the Code that
is subject to recapture.

  (e) The tax returns and tax work papers made available by Key to Columbus
contain accurate and complete information in all material respects with respect
to the net operating losses, net operating loss carry forwards and other tax
attributes of Key, and the extent to which they are subject to any limitation
under Code sections 381, 382, 383, or 384, or any other provision of the Code or
the federal consolidated return regulations (or any predecessor provision of any
Code section or the regulations) and there is nothing that would prevent Key
from utilizing these net operating losses, net operating loss carry forwards or
other tax attributes as so limited if it had sufficient income.

  (f) Where appropriate in this section 4.15, the singular shall include the
plural.

  SECTION 4.16. Certain Business Practices. None of Key or any directors,
officers, agents or employees of Key has (i) used any funds for unlawful
contributions, gifts, entertainment or other unlawful expenses relating to
political activity, (ii) made any unlawful payment to foreign or domestic
government officials or employees or to foreign or domestic political parties or
campaigns or violated any provision of the Foreign Corrupt Practices Act of
1977, as amended, or (iii) made any other unlawful payment.

  SECTION 4.17. Environmental Matters. Except for matters disclosed in the Key
SEC Reports filed prior to the date hereof or disclosed in Schedule 4.17 to the
Key Disclosure Schedule, and except for matters that would not, individually or
in the aggregate, result in a Key Material Adverse Effect, (i) the properties,
operations and activities of Key are in compliance with all applicable
Environmental Laws; (ii) Key and the properties and operations of Key are not
subject to any existing, pending or, to the knowledge of Key, threatened action,
suit, investigation, inquiry or proceeding by or before any governmental
authority under any Environmental Law; (iii) all notices, permits, licenses, or
similar authorizations, if any, required to be obtained or filed by Key under
any Environmental Law in connection with any aspect of the business of Key,
including without limitation those relating to the treatment, storage, disposal
or release of a hazardous substance, have been duly obtained or filed and will
remain valid and in effect after the Merger, and Key is in compliance with the
terms and conditions of all such notices, permits, licenses and similar
authorizations; (iv) Key has satisfied and is currently in compliance with all
financial responsibility requirements applicable to their operations and imposed
by any governmental authority under any Environmental Law, and Key has not
received any notice of noncompliance with any such financial responsibility
requirements; (v) to Key's knowledge, there are no physical or environmental
conditions existing on any property of Key or resulting from Key's operations or



                                                             A-33

<PAGE>



activities, past or present, at any location, that would give rise to any
on-site or off-site remedial obligations imposed on Key under any Environmental
Laws; (vi) to Key's knowledge, since the effective date of the relevant
requirements of applicable Environmental Laws and to the extent required by such
applicable Environmental Laws, all hazardous substances generated by Key have
been transported only by carriers authorized under Environmental Laws to
transport such substances and wastes, and disposed of only at treatment,
storage, and disposal facilities authorized under Environmental Laws to treat,
store or dispose of such substances and wastes; (vii) there has been no exposure
of any person or property to hazardous substances or any pollutant or
contaminant, nor has there been any release of hazardous substances or any
pollutant or contaminant into the environment by Key or in connection with its
properties or operations that could reasonably be expected to give rise to any
claim against Key for damages or compensation; and (viii) Key has made available
to Columbus all non-privileged internal and external environmental audits and
studies and all non-privileged correspondence on substantial environmental
matters in the possession of Key relating to any of the current or former
properties or operations of Key. To Key's knowledge, except for matters
disclosed in Schedule 4.17 to the Key Disclosure Schedule, the operations of
each third party operator of any of Key's properties are in compliance with the
terms of this Section 4.17.

  SECTION 4.18. Insurance. Key is currently insured, and during each of the past
five calendar years has been insured, for reasonable amounts against such risks
as companies engaged in a similar business would, in accordance with good
business practice, customarily be insured.

  SECTION 4.19. Properties.

  (a) With respect to Key's non-oil and gas properties, except for liens arising
in the ordinary course of business after the date hereof and properties and
assets disposed of in the ordinary course of business after the date of the most
recent balance sheet contained in the Form 10-Q referred to below, Key has good
and marketable title free and clear of all liens, the existence of which would
have a Key Material Adverse Effect, to all their material properties and assets,
whether tangible or intangible, real, personal or mixed, reflected in Key's most
recent consolidated balance sheet contained in Key's most recent Key SEC Report
on Form 10- Q filed prior to the date hereof as being owned by Key as of the
date thereof or purported to be owned on the date hereof. All buildings, and all
fixtures, equipment and other property and assets which are material to its
business on a consolidated basis, held under leases by Key are held under valid
instruments enforceable by Key in accordance with their respective terms.
Substantially all of Key's equipment in regular use has been well maintained and
is in good and serviceable condition, reasonable wear and tear excepted.

  (b) With respect to Key's oil and gas properties, Schedule 4.19(b) to the Key
Disclosure Schedule lists, as of the date of this Agreement, the material
producing oil and gas properties owned by Key (the "Key Oil and Gas Properties")
and certain information with respect thereto. Other than matters that do not
have a Key Material Adverse Effect:

    (i) Key has Defensible Title to all Key Oil and Gas Properties, subject to
and except for the Permitted Encumbrances and as would be acceptable to a
reasonably prudent operator of oil and gas properties.

      (A) As used herein, the term "Defensible Title" shall mean as to the wells
and properties described in Schedule 4.19(b) to the Key Disclosure Schedule



                                                             A-34

<PAGE>



(individually called a "Property"), such title as will enable Key to receive not
less than the net revenue interests set forth on Schedule 4.19(b) to the Key
Disclosure Schedule of all hydrocarbons and other minerals produced from each
Property, and which will obligate Key to bear costs and expenses relating to the
maintenance, development, and operations of each Property not greater than the
working interests set forth on Schedule 4.19(b) to the Key Disclosure Schedule.

      (B) As used herein, the term "Permitted Encumbrances" shall mean:

        (1) lessors' royalties, overriding royalties, division orders,
reversionary interests and net profits interests and similar burdens which do
not operate to reduce the net revenue interests in any Property below those set
forth on Schedule 4.19(b) to the Key Disclosure Schedule;

        (2) the terms and conditions of the oil, gas and mineral leases (the
"Key Leases") related to the Key Oil and Gas Properties and all agreements,
orders, instruments and declarations to which the Key Leases are subject and
that are customary and acceptable in the oil and gas industry in the area of the
particular property;

        (3) liens arising under operating agreements, pooling, unitization or
communitization agreements, and similar agreements of a type and nature
customary in the oil and gas industry and securing payment of amounts not yet
delinquent;

        (4) liens securing payments to mechanics and materialmen, and liens
securing payment of taxes or assessments, which liens are not yet delinquent or,
if delinquent, are being contested in good faith in the normal course of
business;

        (5) conventional rights of reassignment obligating Key to reassign their
interests in a portion of the Key Oil and Gas Properties to a third party in the
event Key intends to release or abandon such interest;

        (6) calls on or preferential rights to purchase production at not less
than prevailing prices;

        (7) covenants, conditions, and other terms to which the Key Oil and Gas
Properties were subject when acquired by Key and are not such as to materially
interfere with the operation, value, use and enjoyment of the Key Oil and Gas
Properties;

        (8) rights reserved to or vested in any Governmental Entity to control
or regulate any of the Oil and Gas Properties in any manner, and all applicable
laws, rules, regulations and orders of any such Governmental Entity;

        (9) easements, rights-of-way, servitudes, permits, surface leases, and
other surface uses on, over or in respect of any of the Key Oil and Gas
Properties that are not such as to materially interfere with the operation,
value or use thereof; and

        (10) all other liens, charges, encumbrances, limitations, obligations,
defects and irregularities affecting any portion of the Key Oil and Gas
Properties which would not have a material adverse effect on the operation,
value, use and enjoyment thereof.

    (ii) Except as described in Schedule 4.19(b) to the Key Disclosure Schedule,
the



                                                             A-35

<PAGE>



Key Leases are in full force and effect, are valid and subsisting, cover the
entire estates they purport to cover and contain no express provisions that
require the drilling of additional wells or other material development
operations in order to earn or to continue to hold all or any portion of the Key
Oil and Gas Properties, and to the knowledge of Key has never been advised
directly or indirectly by any lessor under any such Lease or by any other party
of a default under any Key Lease or of any requirements or demands to drill
additional wells on any of the lands included within any of the Key Oil and Gas
Properties.

    (iii) Key is not in default under any contract or agreement pertaining to
the Key Oil and Gas Properties. Except as specifically indicated on Schedule
4.19(b) to the Key Disclosure Schedule, and except for hydrocarbon sales
contracts with a term not greater than six months, no hydrocarbons produced from
the Key Oil and Gas Properties are subject to a sales contract or other
agreement relating to the marketing of hydrocarbons, and no person has any call
upon, option to purchase or similar rights with respect to the Key Oil and Gas
Properties or the rights therefrom.

    (iv) All royalties, rentals and other payments due under the Key Leases have
been properly and timely paid, and all conditions necessary to keep the Key
Leases in force have been fully performed.

    (v) Except for gas balancing agreements containing customary provisions, Key
is not obligated, by virtue of a prepayment arrangement, a "take or pay"
arrangement, a production payment or any other arrangement, to deliver
hydrocarbons produced from the Key Oil and Gas Properties at some future time
without then or thereafter receiving full payment therefor.

    (vi) Except as set forth on Schedule 4.19(b) to the Key Disclosure Schedule,
with respect to Authorizations for Expenditure executed on or after May 31, 2000
and covering expenditures exceeding $250,000 attributable to Key's interest,

      (1) there are no outstanding calls under Authorizations for Expenditures
for payments which are due or which Key has committed to make which have not
been made;

      (2) there are no material operations with respect to which Key has become
a non-consenting party where the effect of such non-consent is not disclosed on
Schedule 4.19(b) to the Key Disclosure Schedule, and

     (3) there are no commitments for the expenditure of funds for drilling or
other capital projects other than projects with respect to which the operator is
not required under the applicable operating agreement to seek consent.

    (vii) Except as set forth on Schedule 4.19(b) to the Key Disclosure
Schedule, there are no Key Oil and Gas Properties to which Key is either "over-
produced" or "under-produced" which singly or in the aggregate would have a Key
Material Adverse Effect.

  SECTION 4.20. Certain Contracts and Restrictions. Other than agreements,
contracts or commitments listed elsewhere in the Key Disclosure Schedule,
Schedule 4.20 to the Key Disclosure Schedule lists, as of the date of this
Agreement, each agreement, contract or commitment (including any amendments
thereto) to which Key is a party or by which Key is bound (i) involving
consideration during the next twelve months in excess of $250,000 or (ii) which
is otherwise material to the financial condition, results of operations or
business of Key. As of the date of this Agreement and



                                                             A-36

<PAGE>



except as indicated on the Key Disclosure Schedule, (i) Key has fully complied
in all material respects with all the terms and conditions of all agreements,
contracts and commitments listed in the Key Disclosure Schedule and all such
agreements, contracts and commitments are in full force and effect, (ii) Key has
no knowledge of any defaults thereunder or any cancellations or modifications
thereof, and (iii) such agreements, contracts and commitments are not subject to
any memorandum or other written document or understanding permitting
cancellation.

  SECTION 4.21. Easements. The business of Key has been operated in a manner
that does not violate the material terms of any easements, rights of way,
permits, servitudes, licenses and similar rights relating to real property used
by Key in its business (collectively, "Key Easements") except for violations
that have not resulted and will not result in a Key Material Adverse Effect. All
material Key Easements are valid and enforceable and grant the rights purported
to be granted thereby and all rights necessary thereunder for the current
operation of such business.

  SECTION 4.22. Futures Trading. Except as set forth on Schedule 4.22 to the Key
Disclosure Schedule, Key does not engage in any natural gas or other futures or
options trading or is a party to any price swaps, hedges, futures or similar
instruments.

                                    ARTICLE V

                                    COVENANTS

  SECTION 5.01. Affirmative Covenants of Columbus. Columbus hereby covenants and
agrees that, prior to the Effective Time, unless otherwise expressly
contemplated by this Agreement or consented to in writing by Key, Columbus will
and will cause its subsidiaries to:

    (a) operate its business in all material respects in the usual and ordinary
course consistent with past practices;

    (b) use all reasonable efforts to preserve substantially intact its business
organization, maintain its material rights and franchises, retain the services
of its respective officers and key employees and maintain its relationships with
its material customers and suppliers;

    (c) maintain and keep its material properties and assets in as good repair
and condition as at present, ordinary wear and tear excepted, and maintain
supplies and inventories in quantities consistent with its customary business
practice;

    (d) use all reasonable efforts to keep in full force and effect insurance
and bonds comparable in amount and scope of coverage to that currently
maintained.

  SECTION 5.02. Negative Covenants of Columbus. Except as expressly contemplated
by this Agreement or otherwise consented to in writing by Key, from the date of
this Agreement until the Effective Time, Columbus will not do, and will not
permit any of its subsidiaries to do, any of the foregoing:

    (a) (i) increase the compensation payable to or to become payable to any
director or executive officer; (ii) grant any severance or termination pay to,
or enter into or amend any employment or severance agreement with, any director,
officer or employee; (iii) establish, adopt or enter into any employee benefit
plan



                                                             A-37

<PAGE>



or arrangement; (iv) grant any bonuses under the Incentive Compensation Plan, or
(v) except as may be required by applicable law and actions that are not
inconsistent with the provisions of Section 6.07 of this Agreement, amend, or
take any other actions with respect to, any of the Benefit Plans or any of the
plans, programs, agreements, policies or other arrangements described in Section
3.10(d) of this Agreement;

    (b) declare or pay any dividend on, or make any other distribution in
respect of, outstanding shares of capital stock, except for dividends by a
wholly owned subsidiary of Columbus to Columbus or another wholly owned
subsidiary of Columbus, or redeem any stock of Columbus;

    (c) (i) except as described in Schedule 3.03(b)(ii) to the Columbus
Disclosure Schedule, redeem, purchase or otherwise acquire any shares of its or
any of its subsidiaries' capital stock or any securities or obligations
convertible into or exchangeable for any shares of its or its subsidiaries'
capital stock (other than any such acquisition directly from any wholly owned
subsidiary of Columbus in exchange for capital contributions or loans to such
subsidiary), or any options, warrants or conversion or other rights to acquire
any shares of its or its subsidiaries' capital stock or any such securities or
obligations (except in connection with the exercise of outstanding Stock Options
in accordance with their terms); (ii) effect any reorganization or
recapitalization; or (iii) split, combine or reclassify any of its or its
subsidiaries' capital stock or issue or authorize or propose the issuance of any
other securities in respect of, in lieu of or in substitution for, shares of its
or its subsidiaries' capital stock;

  (d) (i) except as described in Schedule 3.03(b)(i) to the Columbus Disclosure
Schedule, issue, deliver, award, grant or sell, or authorize or propose the
issuance, delivery, award, grant or sale (including the grant of any security
interests, liens, claims, pledges, limitations in voting rights, charges or
other encumbrances) of, any shares of any class of its or its subsidiaries'
capital stock (including shares held in treasury), any securities convertible
into or exercisable or exchangeable for any such shares, or any rights, warrants
or options to acquire any such shares (except as permitted pursuant to Section
6.07 of this Agreement or for the issuance of shares upon the exercise of
outstanding Stock Options or the vesting of restricted stock in accordance with
the terms of outstanding Stock Awards); (ii) amend or otherwise modify the terms
of any such rights, warrants or options the effect of which shall be to make
such terms more favorable to the holders thereof; or (iii) take any action to
optionally accelerate the exercisability of Stock Options;

  (e) acquire or agree to acquire, by merging or consolidating with, by
purchasing an equity interest in or a portion of the assets of, or by any other
manner, any business or any corporation, partnership, association or other
business organization or division thereof, or otherwise acquire or agree to
acquire any assets of any other person (other than the purchase of assets from
suppliers or vendors in the ordinary course of business and consistent with past
practice);

  (f) sell, lease, exchange, mortgage, pledge, transfer or otherwise dispose of,
or agree to sell, lease, exchange, mortgage, pledge, transfer or otherwise
dispose of, any of its material assets or any material assets of any of its
subsidiaries, except for dispositions of oil and gas production in the ordinary
course of business and consistent with past practice and except for the sale of
oil and gas properties having an individual net present value of $25,000
(discounted at 10% per annum);




                                                             A-38

<PAGE>



  (g) initiate, solicit or encourage (including by way of furnishing information
or assistance), or take any other action to facilitate, any inquiries or the
making of any proposal relating to, or that may reasonably be expected to lead
to, any Competing Transaction (as defined below), or enter into discussions or
negotiate with any person or entity in furtherance of such inquiries or to
obtain a Competing Transaction, or agree to or endorse any Competing
Transaction, or authorize or permit any of the officers, directors or employees
of Columbus or any of its subsidiaries or any investment banker, financial
advisor, attorney, accountant or other representative retained by Columbus or
any of Columbus' subsidiaries to take any such action, and Columbus shall
promptly notify Key of all relevant terms of any such inquiries and proposals
received by Columbus or any of its subsidiaries or by any such officer,
director, investment banker, financial advisor, attorney, accountant or other
representative relating to any of such matters and if such inquiry or proposal
is in writing, Columbus shall promptly deliver or cause to be delivered to Key a
copy of such inquiry or proposal; provided, however, that nothing contained in
this subsection (g) shall prohibit the Board of Directors of Columbus from (i)
furnishing information to, or entering into discussions or negotiations with,
any person or entity in connection with an unsolicited bona fide proposal in
writing by such person or entity to acquire Columbus pursuant to a merger,
consolidation, share exchange, business combination or other similar transaction
or to acquire a substantial portion of the assets of Columbus or any of its
Significant Subsidiaries, if, and only to the extent that (A) the Board of
Directors of Columbus, after consultation with and based upon the advice of
independent legal counsel (who may be Columbus' regularly engaged independent
legal counsel), determines in good faith that such proposal constitutes or is
likely to lead to a proposal that is materially more favorable to the
stockholders of Columbus than the terms of the Merger and (B) prior to
furnishing such information to, or entering into discussions or negotiations
with, such person or entity Columbus (x) provides written notice to Key to the
effect that it is furnishing information to, or entering into discussions or
negotiations with, such person or entity and (y) enters into with such person or
entity a confidentiality agreement in reasonably customary form on terms not
more favorable to such person or entity than the terms contained in those
certain Confidentiality Agreements dated as of April 11, 2000 and August 23,
2000, respectively, between Key and Columbus (the "Confidentiality Agreements");
(ii) complying with Rule 14e-2 promulgated under the Exchange Act with regard to
a Competing Transaction; or (iii) failing to make or withdrawing or modifying
its recommendation referred to in Section 6.02(a) or taking the action required
by the second sentence of Section 6.01 if there exists a Competing Transaction
and the Board of Directors of Columbus, after consultation with and based upon
the advice of independent legal counsel (who may be Columbus' regularly engaged
independent legal counsel), determines in good faith that the Competing
Transaction is materially more favorable to the stockholders of Columbus than
the terms of the Merger. For purposes of this Agreement, "Competing Transaction"
shall mean any of the following (other than the transactions contemplated by
this Agreement) involving Columbus or any of its subsidiaries: (i) any merger,
consolidation, share exchange, business combination or similar transaction; (ii)
any sale, lease, exchange, mortgage, pledge, transfer or other disposition of
20% or more of the assets of Columbus and its subsidiaries, taken as a whole,
(iii) any tender offer or exchange offer for 20% or more of the outstanding
shares of capital stock of Columbus or the filing of a registration statement
under the Securities Act in connection therewith; (iv) any person (other than
stockholders as of the date of this Agreement) having acquired beneficial
ownership of, or any group (as such term is defined under Section 13(d) of the
Exchange Act and the rules and regulations promulgated thereunder) having been
formed which beneficially owns or has the right to acquire beneficial ownership
of, 20% or more of the outstanding shares of capital



                                                             A-39

<PAGE>



stock of Columbus; or (v) any public announcement of a proposal, plan or
intention to do any of the foregoing or any agreement to engage in any of the
foregoing;

  (h) adopt or propose to adopt any amendments to its charter or bylaws, which
would alter the terms of its capital stock or would have an adverse impact on
the consummation of the transactions contemplated by this Agreement;

  (i) (A) change any of its methods of accounting in effect at December 31,
1999, or (B) make or rescind any express or deemed election relating to Taxes,
settle or compromise any claim, action, suit, litigation, proceeding,
arbitration, investigation, audit or controversy relating to Taxes (except where
the amount of such settlements or controversies, individually or in the
aggregate, does not exceed $50,000), or change any of its methods of reporting
income or deductions for federal income tax purposes from those employed in the
preparation of the federal income tax returns for the taxable year ended
December 31, 1999, except, in each case, as may be required by Law or generally
accepted accounting principles;

  (j) incur any obligation for borrowed money or purchase money indebtedness,
whether or not evidenced by a note, bond, debenture or similar instrument,
except in the ordinary course of business consistent with past practice and in
no event in excess of $100,000 in the aggregate;

  (k) enter into any material arrangement, agreement or contract with any third
party which provides for an exclusive arrangement with that third party or is
substantially more restrictive on Columbus or substantially less advantageous to
Columbus than arrangements, agreements or contracts existing on the date hereof;

  (l) agree to or approve any commitment, including any authorization for
expenditure or agreement to acquire property, obligating Columbus for an amount
in excess of $30,000; or

  (m) agree in writing or otherwise to do any of the foregoing.

  SECTION 5.03. Affirmative and Negative Covenants of Key.

  (a) Key hereby covenants and agrees that, prior to the Effective Time, unless
otherwise expressly contemplated by this Agreement or consented to in writing by
Columbus, Key will and will cause its subsidiaries to:

    (i) operate its business in all material respects in the usual and ordinary
course consistent with past practices;

    (ii) use all reasonable efforts to preserve substantially intact its
business organization, maintain its material rights and franchises, retain the
services of its respective officers and key employees and maintain its
relationships with its material customers and suppliers;

    (iii) maintain and keep its material properties and assets in as good repair
and condition as at present, ordinary wear and tear excepted, and maintain
supplies and inventories in quantities consistent with its customary business
practice; and

    (iv) use all reasonable efforts to keep in full force and effect insurance
and bonds comparable in amount and scope of coverage to that currently
maintained.

  (b) Except as expressly contemplated by this Agreement or otherwise consented
to



                                                             A-40

<PAGE>



in writing by Columbus, from the date of this Agreement until the Effective
Time, Key will not do, and will not permit any of its subsidiaries to do, any of
the following:

    (i) knowingly take any action which would result in a failure to maintain
the trading of the Key Common Stock on the New York Stock Exchange;

    (ii) declare or pay any dividend on, or make any other distribution in
respect of, outstanding shares of capital stock, except for dividends by a
wholly owned subsidiary of Key to Key or another wholly owned subsidiary of Key,
or redeem any stock of Key, except for open market purchases from
non-affiliates;

    (iii) adopt or propose to adopt any amendments to its charter or bylaws,
which would have an adverse impact on the consummation of the transactions
contemplated by this Agreement; or

    (iv) agree in writing or otherwise to do any of the foregoing.

  SECTION 5.04. Access and Information.

  (a) Columbus shall, and shall cause its subsidiaries to (i) afford to Key and
its officers, directors, employees, accountants, consultants, legal counsel,
agents and other representatives (collectively, the "Key Representatives")
reasonable access at reasonable times, upon reasonable prior notice, to the
officers, employees, agents, properties, offices and other facilities of
Columbus and its subsidiaries and to the books and records thereof and (ii)
furnish promptly to Key and the Key Representatives such information concerning
the business, properties, contracts, records and personnel of Columbus and its
subsidiaries (including, without limitation, financial, operating and other data
and information) as may be reasonably requested, from time to time, by Key.

  (b) Key shall, and shall cause its subsidiaries to (i) afford to Columbus and
its officers, directors, employees, accountants, consultants, legal counsel,
agents and other representatives (collectively, the "Columbus Representatives")
reasonable access at reasonable times, upon reasonable prior notice, to the
officers, employees, accountants, agents, properties, offices and other
facilities of Key and its subsidiaries and to the books and records thereof and
(ii) furnish promptly to Columbus and the Columbus Representatives such
information concerning the business, properties, contracts, records and
personnel of Key and its subsidiaries (including, without limitation, financial,
operating and other data and information) as may be reasonably requested, from
time to time, by Columbus.

  (c) Notwithstanding the foregoing provisions of this Section 5.04, neither
party shall be required to grant access or furnish information to the other
party to the extent that such access or the furnishing of such information is
prohibited by law. No investigation by the parties hereto made heretofore or
hereafter shall affect the representations and warranties of the parties which
are herein contained and each such representation and warranty shall survive
such investigation.

  (d) The information received pursuant to Section 5.04 (a) and (b) shall be
deemed to be "Confidential Information" for purposes of the Confidentiality
Agreements.




                                                             A-41

<PAGE>



                                   ARTICLE VI

                              ADDITIONAL AGREEMENTS

  SECTION 6.01. Meeting of Stockholders. Columbus shall, promptly after the date
of this Agreement, take all actions necessary in accordance with Colorado Law
and its charter and bylaws to convene a special meeting of Columbus'
stockholders to act on this Agreement (the "Columbus Stockholders Meeting"), and
Columbus shall consult with Key in connection therewith. Columbus shall use its
best efforts to solicit from stockholders of Columbus proxies in favor of the
approval and adoption of this Agreement and to secure the vote of stockholders
required by Colorado Law and its charter and bylaws to approve and adopt this
Agreement, unless otherwise necessary due to the applicable fiduciary duties of
the directors of Columbus, as determined by such directors in good faith after
consultation with and based upon the advice of independent legal counsel (who
may be Columbus' regularly engaged independent legal counsel).

  SECTION 6.02. Registration Statement; Proxy Statements.

  (a) As promptly as practicable after the execution of this Agreement, Key
shall prepare and file with the SEC a registration statement on Form S-4 (such
registration statement, together with any amendments thereof or supplements
thereto, being the "Registration Statement"), containing a proxy
statement/prospectus for stockholders of Columbus (the "Columbus Proxy
Statement/Prospectus"), in connection with the registration under the Securities
Act of the offer and sale of Key Common Stock to be issued in the Merger and the
other transactions contemplated by this Agreement. As promptly as practicable
after the execution of this Agreement, Columbus shall prepare and file with the
SEC a proxy statement that will be the same as the Columbus Proxy
Statement/Prospectus, and a form of proxy, in connection with the vote of
Columbus' stockholders with respect to the Merger (such proxy statement and form
of proxy, together with any amendments thereof or supplements thereto, in each
case in the form or forms mailed to Columbus' stockholders, being the "Columbus
Proxy Statement"). Each of Key and Columbus will use its best efforts to cause
the Registration Statement to be declared effective as promptly as practicable,
and shall take any action required to be taken under any applicable federal or
state securities laws in connection with the issuance of shares of Key Common
Stock in the Merger. Each of Key and Columbus shall furnish to the other all
information concerning it and the holders of its capital stock as the other may
reasonably request in connection with such actions. As promptly as practicable
after the Registration Statement shall have been declared effective, Columbus
shall mail the Columbus Proxy Statement to its stockholders entitled to notice
of and to vote at the Columbus Stockholders Meeting. The Columbus Proxy
Statement shall include the recommendation of Columbus' Board of Directors in
favor of the Merger and adoption of this Agreement, unless otherwise necessary
due to the applicable fiduciary duties of the directors of Columbus, as
determined by such directors in good faith after consultation with and based
upon the advice of independent legal counsel (who may be Columbus' regularly
engaged independent legal counsel).

  (b) The information supplied by Columbus for inclusion in the Registration
Statement shall not, at the time the Registration Statement is declared
effective, contain any untrue statement of a material fact or omit to state any
material fact required to be stated therein or necessary in order to make the
statements therein not misleading. The information supplied by Columbus for
inclusion in the Columbus Proxy Statement to be sent to the stockholders of
Columbus in connection with the Columbus Stockholders Meeting shall not, at the
date the Columbus Proxy Statement (or any supplement thereto) is first mailed to
stockholders, at the time of the Columbus Stockholders Meeting or at the
Effective Time, contain any untrue statement of a material fact or omit to state
any material fact required to be stated therein



                                                             A-42

<PAGE>



or necessary in order to make the statements therein, in the light of the
circumstances under which they are made, not misleading. If at any time prior to
the Effective Time any event or circumstance relating to Columbus or any of its
affiliates, or its or their respective officers or directors, should be
discovered by Columbus that should be set forth in an amendment to the
Registration Statement or a supplement to the Columbus Proxy Statement, Columbus
shall promptly inform Key thereof in writing. All documents that Columbus is
responsible for filing with the SEC in connection with the transactions
contemplated herein will comply as to form in all material respects with the
applicable requirements of the Securities Act and the rules and regulations
thereunder and the Exchange Act and the rules and regulations thereunder.

  (c) The information supplied by Key for inclusion in the Registration
Statement shall not, at the time the Registration Statement is declared
effective, contain any untrue statement of a material fact or omit to state any
material fact required to be stated therein or necessary in order to make the
statements therein not misleading. The information supplied by Key for inclusion
in the Columbus Proxy Statement to be sent to the stockholders of Columbus in
connection with the Columbus Stockholders Meeting shall not, at the date the
Columbus Proxy Statement (or any supplement thereto) is first mailed to
stockholders, at the time of the Columbus Stockholders Meeting or at the
Effective Time shall not, at the Effective Time, contain any untrue statement of
a material fact or omit to state any material fact required to be stated therein
or necessary in order to make the statements therein, in the light of the
circumstances under which they are made, not misleading. If at any time prior to
the Effective Time any event or circumstance relating to Key or any of its
affiliates, or to their respective officers or directors, should be discovered
by Key that should be set forth in an amendment to the Registration Statement or
a supplement to the Columbus Proxy Statement, Key shall promptly inform Columbus
thereof in writing. All documents that Key is responsible for filing with the
SEC in connection with the transactions contemplated hereby will comply as to
form in all material respects with the applicable requirements of the Securities
Act and the rules and regulations thereunder and the Exchange Act and the rules
and regulations thereunder.

  SECTION 6.03. Appropriate Action; Consents; Filings.

  (a) Columbus and Key shall each use, and shall cause each of their respective
subsidiaries to use, all reasonable efforts to (i) take, or cause to be taken,
all appropriate action, and do, or cause to be done, all things necessary,
proper or advisable under applicable Law or otherwise to consummate and make
effective the transactions contemplated by this Agreement, (ii) obtain from any
Governmental Entities any consents, licenses, permits, waivers, approvals,
authorizations or orders required to be obtained or made by Key or Columbus or
any of their subsidiaries in connection with the authorization, execution and
delivery of this Agreement and the consummation of the transactions contemplated
hereby, including, without limitation, the Merger, (iii) make all necessary
filings, and thereafter make any other required submissions, with respect to
this Agreement and the Merger required under (A) the Securities Act (in the case
of Key) and the Exchange Act and the rules and regulations thereunder, and any
other applicable federal or state securities laws, and (B) any other applicable
Law; provided that Key and Columbus shall cooperate with each other in
connection with the making of all such filings, including providing copies of
all such documents to the nonfiling party and its advisors prior to filings and,
if requested, shall accept all reasonable additions, deletions or changes
suggested in connection therewith. Columbus and Key shall furnish all
information required for any application or other filing to be made



                                                             A-43

<PAGE>



pursuant to the rules and regulations of any applicable Law (including all
information required to be included in the Columbus Proxy Statement or the
Registration Statement) in connection with the transactions contemplated by this
Agreement.

  (b) Key and Columbus agree to cooperate with respect to, and shall cause each
of their respective subsidiaries to cooperate with respect to, and agree to use
all reasonable efforts vigorously to contest and resist, any action, including
legislative, administrative or judicial action, and to have vacated, lifted,
reversed or overturned any decree, judgment, injunction or other order (whether
temporary, preliminary or permanent) (an "Order") of any Governmental Entity
that is in effect and that restricts, prevents or prohibits the consummation of
the Merger or any other transactions contemplated by this Agreement, including,
without limitation, by vigorously pursuing all available avenues of
administrative and judicial appeal and all available legislative action. Each of
Key and Columbus also agree to take any and all actions, including, without
limitation, the disposition of assets or the withdrawal from doing business in
particular jurisdictions, required by regulatory authorities as a condition to
the granting of any approvals required in order to permit the consummation of
the Merger or as may be required to avoid, lift, vacate or reverse any
legislative or judicial action which would otherwise cause any condition to
Closing not to be satisfied; provided, however, that in no event shall either
party take, or be required to take, any action that would or could reasonably be
expected to have a Key Material Adverse Effect, and Columbus shall not be
required to take any action which would be consummated prior to the Effective
Time and which would or could reasonably be expected to have a Columbus Material
Adverse Effect .

  (c) (i) Each of Columbus and Key shall give (or shall cause their respective
subsidiaries to give) any notices to third parties, and use, and cause their
respective subsidiaries to use, all reasonable efforts to obtain any third party
consents (A) necessary, proper or advisable to consummate the transactions
contemplated by this Agreement, (B) otherwise required under any contracts,
licenses, leases or other agreements in connection with the consummation of the
transactions contemplated hereby or (C) required to prevent a Columbus Material
Adverse Effect from occurring prior to the Effective Time or a Key Material
Adverse Effect from occurring after the Effective Time.

    (ii) In the event that any party shall fail to obtain any third party
consent described in subsection (c)(i) above, such party shall use all
reasonable efforts, and shall take any such actions reasonably requested by the
other parties, to limit the adverse effect upon Columbus and Key, their
respective subsidiaries, and their respective businesses resulting, or which
could reasonably be expected to result after the Effective Time, from the
failure to obtain such consent.

  (d) Each of Key and Columbus shall promptly notify the other of (w) any
material change in its business, financial condition or results of operations,
(x) any complaints, investigations or hearings (or communications indicating
that the same may be contemplated) of any Governmental Entities with respect to
its business or the transactions contemplated hereby, (y) the institution or the
threat of material litigation involving it or any of its subsidiaries or (z) any
event or condition that might reasonably be expected to cause any of its
representations, warranties, covenants or agreements set forth herein not to be
true and correct at the Effective Time. As used in the preceding sentence,
"material litigation" means any case, arbitration or adversary proceeding or
other matter which would have been required to be disclosed on the Columbus
Disclosure Schedule pursuant to Section 3.09 or the



                                                             A-44

<PAGE>



Key Disclosure Schedule pursuant to Section 4.09, as the case may be, if in
existence on the date hereof, or in respect of which the legal fees and other
costs to Columbus or Key (or their respective subsidiaries), as the case may be,
might reasonably be expected to exceed $100,000 over the life of the matter.

  SECTION 6.04. Affiliates; Tax Treatment.

  (a) Columbus shall use all reasonable efforts to cooperate with Key in
complying with Rule 145 under the Securities Act.

  (b) Key shall not be required to maintain the effectiveness of the
Registration Statement for the purpose of resale by stockholders of Columbus who
may be affiliates of Columbus or Key pursuant to Rule 145 under the Securities
Act.

  (c) Each party hereto shall use all reasonable efforts to cause the Merger to
qualify, and shall not take, and shall use all reasonable efforts to prevent any
affiliate of such party from taking, any actions that could prevent the Merger
from qualifying, as a reorganization under the provisions of section 368(a) of
the Code.

  SECTION 6.05. Public Announcements. Key and Columbus shall consult with each
other before issuing any press release or otherwise making any public statements
with respect to the Merger and, except as required by law, shall not issue any
such press release or make any such public statement prior to such consultation.
The joint press release of Key and Columbus announcing the execution and
delivery of this Agreement is attached as Exhibit A.

  SECTION 6.06. New York Stock Exchange Listing. Key shall use all reasonable
efforts to cause the shares of Key Common Stock to be issued in the Merger to be
approved for listing (subject to official notice of issuance) on the New York
Stock Exchange prior to the Effective Time.

  SECTION 6.07. Employees and Employee Benefits.

  (a) Employees. Prior to the Effective Time, Key shall notify Columbus of the
employees of Columbus who are employed by Columbus immediately before the
Effective Time that Key desires to retain after the Effective Time (the
"Columbus Employees"). Key agrees that the Columbus Employees will participate
in the Key Benefit Plans according to this Section 6.07 and the terms and
conditions of the Key Benefit Plans; provided however, that Key and Merger agree
to honor, and to cause the Surviving Corporation to honor, all severance
agreements or other agreements, contracts, plans, programs, policies, or
arrangements for the payment of severance or other benefits upon consummation of
a change of control or other business combination involving Columbus in
existence as of the date hereof and further provided, however, that if Key
offers employment to a Columbus Employee with the same salary, duties and
location for a period longer than one year after the Effective Time, no
severance payments shall be due to such Columbus Employees and Columbus shall
amend such plans before the Effective Time to the extent necessary to so
provide. Key and Merger Sub acknowledge that all payments due upon consummation
of the Merger under any such agreements, contracts, plans, programs, policies or
arrangements shall be made on the date of termination of employment.

  (b) Employee Stock Purchase Plan. Columbus shall take such action as is
necessary to terminate the Columbus 1993 Employee Stock Purchase Plan and any
other employee stock purchase plan of Columbus or any subsidiary of Columbus
(the "Employee Stock Purchase Plan") prior to the Effective Time (the
"Termination Date") provided that



                                                             A-45

<PAGE>



the termination shall be conditioned on the consummation of the Merger. On the
Termination Date, Columbus shall refund the funds credited on such date under
each Employee Stock Purchase Plan in each participant's account to each
Participant in accordance with the terms of the Employee Stock Purchase Plan.

  (c) 401(k) Plan. After the Effective Time, the Columbus Employees shall
participate in the Key 401(k) Plan according to the terms of the Key 401(k)
Plan. The Columbus Employees shall be credited with up to four years of their
service with Columbus for purposes of participation and vesting in the Key
401(k) Plan. Individuals who terminated employment with Columbus prior to the
Effective Time and who are hired by Columbus or Key after the Effective Time
shall be treated as new employees and shall not receive credit for their prior
service with Columbus for any purpose under the Key 401(k) Plan. Columbus shall
take all steps necessary to terminate the Columbus 401(k) Plan immediately prior
to the Effective Time.

  (d) Group Health Plan coverage. The Columbus Employees and their dependents
will be offered group health plan coverage under Key's group health plan
effective the day after the Effective Time. Such coverage shall not exclude any
pre-existing conditions. Any Columbus Employees and dependents who are covered
under the Key group health plan and who terminate employment with Key or
Columbus after the Effective Time shall be offered COBRA continuation coverage
under the Key group health plan.

  Columbus employees who were covered under the Columbus group health plan
immediately before the Effective Time and who are terminated at the Effective
Time shall be offered COBRA continuation coverage under the Key group health
plan. Former employees of Columbus or dependents thereof, who were receiving
COBRA continuation coverage under the Columbus group health plan as of the
Effective Time will be eligible to elect, pursuant to COBRA, to continue
coverage under Key's group health plan for the remainder of the COBRA
continuation period at such former employee's or dependent's sole expense.
Further, if such persons, and dependents thereof, elect COBRA continuation
coverage under Key's group health plan, such persons will not be subject to any
pre-existing condition limitation under Key's group health plan. All such
persons, as of the date of this Agreement, are listed on Schedule 6.07(d).

  (e) Incentive Compensation Plan. Prior to the Effective Date, Columbus shall
take all action necessary to terminate the Incentive Compensation Plan; provided
that the termination shall be conditioned on the consummation of the Merger.

  (f) Other Benefits. Effective the day after the Effective Time, the Columbus
Employees shall participate in the Key Benefit Plans (other than the Key group
health plan, which is covered in subsection 6.07(d) above, and the Key 401(k)
Plan, which is covered in subsection 6.07(c) above) according to the terms and
conditions of each such Key Benefit Plan. The Columbus Employees shall receive
credit for their service with Columbus for all purposes under such plans (except
as provided otherwise in subsections 6.07(c) and (d)). Columbus employees who
accept an offer of employment with Key after the Effective Time shall be
eligible to participate in all Key Benefit Plans (including those implemented
following the Effective Time) according to the terms and conditions of each such
Key Benefit Plan. All Columbus employees who accept an offer of employment with
Key after the Effective Time shall receive credit for prior service with
Columbus as follows: the lesser of actual years of service or an amount equal to
the period of time between January 1, 1993 and the Effective Time for purposes
of participation and vesting in all of the Key Benefit Plans, except as provided
otherwise in subsections 6.07(c) and (d).




                                                             A-46

<PAGE>



  SECTION 6.08. Merger Sub. Prior to the Effective Time, Merger Sub shall not
conduct any business or make any investments other than as specifically
contemplated by this Agreement and will not have any assets (other than a de
minimis amount of cash paid to Merger Sub for the issuance of its stock to Key)
or liabilities.

  SECTION 6.09. Indemnification. (a) From and after the Effective Time, Columbus
shall, and, if applicable, Key shall cause Columbus to, indemnify and hold
harmless, and provide advancement of expenses to, to the fullest extent
permitted under applicable law, each person who is a current or former officer
or director of Columbus or any of its Subsidiaries (each, and "Indemnified
Party") against all losses, claims, damages, liabilities, costs or expenses
(including reasonable attorneys' fees), judgments, fines, penalties and amounts
paid in settlement in connection with any claim, action, suit, proceeding or
investigation arising out of or pertaining to acts or omissions, or alleged acts
or omissions, by them in their capacities as such, which acts or omissions
occurred prior to or as of the Effective Time. Key shall have the option to
control any such claim, action, suit, proceeding or investigation; and shall
have the option to choose counsel to represent the Indemnified Party after
discussion with the Indemnified Party.

         (b) Key agrees that the provisions of Columbus' Restated Articles of
Incorporation and By-laws in effect as of the date of this Agreement affecting
the Indemnified Parties' rights to indemnification, limitation of liability and
advancement of expenses shall survive the consummation of the Merger and shall
continue in full force and effect, without any amendment thereto (unless
required by law), for a period of six years from the Effective Time.

         (c) The provisions of this Section 6.09 are intended to be for the
benefit of, and shall by enforceable by, each of the Indemnified Parties, their
heirs and their representatives, and no amendment or waiver under this Agreement
will have any effect on the rights of the Indemnified Parties.

  SECTION 6.10. Arthur Andersen Opinion Update. At any time up to 10 days prior
to the date of the Columbus Stockholders Meeting, either Columbus or Key may
request that Arthur Andersen LLP deliver its written opinion updated to the date
of the Columbus Stockholders Meeting, to the effect that, subject to the
qualifications and limitations contained therein, as of such date, the Merger
Consideration is fair from a financial point of view to the holders of shares of
Columbus Common Stock (other than the Key Companies). Columbus shall pay the fee
associated with such update.

  SECTION 6.11. Section 16(b). Key and Columbus shall use their reasonable best
efforts to cause the transactions contemplated hereby and any other dispositions
of equity securities of Columbus (including derivative securities) or
acquisitions of Key equity securities in connection with this Agreement by each
individual who (a) is a director or officer of Columbus or (b) at the Effective
Time, will become a director or officer of Key, to be exempt under Rule 16b-3
promulgated under the Exchange Act.


                                   ARTICLE VII

                               CLOSING CONDITIONS

  SECTION 7.01. Conditions to Obligations of Each Party Under This Agreement.
The respective obligations of each party to effect the Merger and the other
transactions



                                                             A-47

<PAGE>



contemplated hereby shall be subject to the satisfaction at or prior to the
Closing Date of the following conditions, any or all of which may be waived in
writing by the parties hereto, in whole or in part, to the extent permitted by
applicable law:

    (a) Effectiveness of the Registration Statement; Blue Sky. The Registration
Statement shall have been declared effective by the SEC under the Securities
Act. No stop order suspending the effectiveness of the Registration Statement
shall have been issued by the SEC and no proceedings for that purpose shall have
been initiated by the SEC. Key shall have received all Blue Sky permits and
other authorizations necessary to consummate the transactions contemplated by
this Agreement.

    (b) Stockholder Approval. This Agreement and the Merger shall have been
approved and adopted by the requisite vote of the stockholders of Columbus.

    (c) No Order. No Governmental Entity or federal or state court of competent
jurisdiction shall have enacted, issued, promulgated, enforced or entered any
statute, rule, regulation, executive order, decree, injunction or other order
(whether temporary, preliminary or permanent) which is in effect and which has
the effect of making the Merger illegal or otherwise prohibiting consummation of
the Merger.

  SECTION 7.02. Additional Conditions to Obligations of the Key Companies. The
obligations of the Key Companies to effect the Merger and the other transactions
contemplated hereby are also subject to the satisfaction at or prior to the
Closing Date of the following conditions, any or all of which may be waived in
writing by Key, in whole or in part, to the extent permitted by applicable law:

    (a) Representations and Warranties. Each of the representations and
warranties of Columbus contained in this Agreement shall be true and correct as
of the Closing Date as though made on and as of the Closing Date (except to the
extent such representations and warranties specifically relate to an earlier
date, in which case such representations and warranties shall be true and
correct as of such earlier date). The Key Companies shall have received a
certificate of the President and the Chief Financial Officer of Columbus, dated
the Closing Date, to such effect.

    (b) Agreements and Covenants. Columbus shall have performed or complied in
all material respects with all agreements and covenants required by this
Agreement to be performed or complied with by it on or prior to the Closing
Date. The Key Companies shall have received a certificate of the President and
the Chief Financial Officer of Columbus, dated the Closing Date, to that effect.

    (c) Material Adverse Change. Since the date of this Agreement, there shall
have been no change, occurrence or circumstance in the business, financial
condition or results of operations of Columbus or any of its subsidiaries having
or reasonably likely to have, individually or in the aggregate, a material
adverse effect on the financial condition, results of operations or business of
Columbus and its subsidiaries, taken as a whole, except as to changes in general
economic conditions that affect each of Key and Columbus substantially equally.
The Key Companies shall have received a certificate of the President and the
Chief Financial Officer of Columbus, dated the Closing Date, to such effect.

    (d) Absence of Regulatory Conditions. There shall not be any action taken,
or any statute, rule, regulation or order enacted, entered, enforced or deemed
applicable to the Merger, by any Governmental Entity in connection with the
grant of a regulatory approval necessary, in the reasonable business judgment of
Key, to the



                                                             A-48

<PAGE>



continuing operation of the business of Columbus, which imposes any condition or
restriction upon the Key Companies or the business or operations of Columbus
which, in the reasonable business judgment of Key, would be materially
burdensome in the context of the transactions contemplated by this Agreement.

    (e) Tax Opinion. Prior to the effective date of the Registration Statement,
Sherman & Howard L.L.C. shall have delivered its written opinion to Key, in form
and substance reasonably satisfactory to Key, to the effect that: (i) the Merger
will constitute a reorganization within the meaning of section 368(a) of the
Code; (ii) Key, Merger Sub and Columbus will each be a party to that
reorganization within the meaning of section 368(b) of the Code; (iii) Key,
Merger Sub and Columbus will not recognize any gain or loss for U.S. federal
income tax purposes as a result of the Merger; and (iv) the Federal Income Tax
Consequences section of the Proxy Statement (which constitutes the prospectus
included in the Registration Statement) describes the material income tax
consequences to Key, Columbus and the Columbus stockholders from the Merger
Transaction and fairly represents such counsel's opinion as to the federal
income tax matters discussed therein. Such firm shall have consented to the
filing of such opinion as an exhibit to the Registration Statement and to the
reference to such firm in the Registration Statement and such tax opinion shall
not have been withdrawn or modified in any material respect prior to the Closing
Date.

    (f) Nonforeign Status.  Columbus shall have delivered to Key at closing such
certificates and affidavits under Section 1445 of the Code as may be requested
by Key in a form satisfactory to Key.

  SECTION 7.03. Additional Conditions to Obligations of Columbus. The
obligations of Columbus to effect the Merger and the other transactions
contemplated hereby are also subject to the satisfaction at or prior to the
Closing Date of the following conditions, any or all of which may be waived in
writing by Columbus, in whole or in part, to the extent permitted by applicable
law:

    (a) Representations and Warranties. Each of the representations and
warranties of the Key Companies contained in this Agreement shall be true and
correct as of the Closing Date as though made on and as of the Closing Date
(except to the extent such representations and warranties specifically relate to
an earlier date, in which case such representations and warranties shall be true
and correct as of such earlier date). Columbus shall have received a certificate
of the President and the Chief Financial Officer of each of the Key Companies,
dated the Closing Date, to such effect.

    (b) Agreements and Covenants. The Key Companies shall have performed or
complied in all material respects with all agreements and covenants required by
this Agreement to be performed or complied with by them on or prior to the
Closing Date. Columbus shall have received a certificate of the President and
the Chief Financial Officer of each of the Key Companies, dated the Closing
Date, to that effect.

    (c) Material Adverse Change. Since the date of this Agreement, there shall
have been no change, occurrence or circumstance in the business, financial
condition or results of operations of Key or any of its subsidiaries having or
reasonably likely to have, individually or in the aggregate, a material adverse
effect on the financial condition, results of operations or business of Key and
its subsidiaries, taken as a whole. Columbus shall have received a certificate
of the President and the Chief Financial Officer of each of the Key Companies,
dated the Closing Date, to such effect.




                                                             A-49

<PAGE>



    (d) Absence of Regulatory Conditions. There shall not be any action taken,
or any statute, rule, regulation or order enacted, entered, enforced or deemed
applicable to the Merger, by any Governmental Entity in connection with the
grant of a regulatory approval necessary, in the reasonable business judgment of
Columbus, to the continuing operation of the business of Key, which imposes any
condition or restriction upon Key or the business or operations of Key which, in
the reasonable business judgment of Columbus, would be materially burdensome in
the context of the transactions contemplated by this Agreement.

    (e) New York Stock Exchange Listing. The shares of Key Common Stock to be
issued in the Merger shall have been approved for listing (subject to official
notice of issuance) on the New York Stock Exchange.

                                  ARTICLE VIII

                        TERMINATION, AMENDMENT AND WAIVER

  SECTION 8.01. Termination. This Agreement may be terminated at any time prior
to the Effective Time, whether before or after approval of this Agreement and
the Merger by the stockholders of Columbus:

    (a) by mutual consent of Key and Columbus;

    (b) by Key, upon a material breach of any representation, warranty, covenant
or agreement on the part of Columbus set forth in this Agreement, or if any
representation or warranty of Columbus shall have become untrue, in either case
such that the conditions set forth in Section 7.02(a) or Section 7.02(b) of this
Agreement, as the case may be, would be incapable of being satisfied by December
31, 2000 (or as otherwise extended as described in Section 8.01(e)); provided,
that in any case, a wilful breach shall be deemed to cause such conditions to be
incapable of being satisfied for purposes of this Section 8.01(b);

    (c) by Columbus, upon a material breach of any representation, warranty,
covenant or agreement on the part of the Key Companies set forth in this
Agreement, or if any representation or warranty of the Key Companies shall have
become untrue, in either case such that the conditions set forth in Section
7.03(a) or Section 7.03(b) of this Agreement, as the case may be, would be
incapable of being satisfied by December 31, 2000 (or as otherwise extended as
described in Section 8.01(e)); provided, that in any case, a wilful breach shall
be deemed to cause such conditions to be incapable of being satisfied for
purposes of this Section 8.01(c);

    (d) by either Key or Columbus, if there shall be any Order which is final
and nonappealable preventing the consummation of the Merger, except if the party
relying on such Order to terminate this Agreement has not complied with its
obligations under Section 6.03(b) of this Agreement;

    (e) by either Key or Columbus, if the Merger shall not have been consummated
before December 31, 2000; provided, however, that this Agreement may be extended
by written notice of either Key or Columbus to a date not later than March 31,
2001, if the Merger shall not have been consummated as a direct result of
Columbus or the Key Companies having failed by December 31, 2000 to receive all
required regulatory approvals or regulatory consents with respect to the Merger;

    (f) by either Key or Columbus, if this Agreement and the Merger shall fail
to receive the requisite vote for approval and adoption by the stockholders of
Columbus



                                                             A-50

<PAGE>



at the Columbus Stockholders Meeting;

    (g) by Key, if (i) the Board of Directors of Columbus withdraws, modifies or
changes its recommendation of this Agreement or the Merger in a manner adverse
to Key or shall have resolved to do any of the foregoing; (ii) the Board of
Directors of Columbus shall have recommended to the stockholders of Columbus any
Competing Transaction or shall have resolved to do so; (iii) a tender offer or
exchange offer for 20% or more of the outstanding shares of capital stock of
Columbus is commenced, and the Board of Directors of Columbus does not recommend
that stockholders not tender their shares into such tender or exchange offer or;
(iv) any person (other than Key or an affiliate thereof, or any stockholder of
Columbus as of the date of this Agreement) shall have acquired beneficial
ownership or the right to acquire beneficial ownership of, or any "group" (as
such term is defined under Section 13(d) of the Exchange Act and the rules and
regulations promulgated thereunder), shall have been formed which beneficially
owns, or has the right to acquire beneficial ownership of, 20% or more of the
then outstanding shares of capital stock of Columbus; or

    (h) by either Key or Columbus, if the Board of Directors of Columbus (x)
fails to make or withdraws its recommendation referred to in Section 6.02(a) if
there exists at such time a Competing Transaction (as defined in Section
5.02(g)), or (y) recommends to Columbus' stockholders approval or acceptance of
a Competing Transaction.

    (i) by Columbus, if Arthur Andersen LLP is requested under Section 6.10 and
fails to deliver its written opinion updated as of the date of the Columbus
Stockholders Meeting, to the effect that, subject to the qualifications and
limitations contained therein, as of such date, the Merger Consideration is fair
from a financial point of view to the holders of shares of Columbus Common Stock
(other than the Key Companies).

  The right of any party hereto to terminate this Agreement pursuant to this
Section 8.01 shall remain operative and in full force and effect regardless of
any investigation made by or on behalf of any party hereto, any person
controlling any such party or any of their respective officers, directors,
representatives or agents, whether prior to or after the execution of this
Agreement.

  SECTION 8.02. Effect of Termination. Except as provided in Section 8.05 or
Section 9.01 of this Agreement, in the event of the termination of this
Agreement pursuant to Section 8.01, this Agreement shall forthwith become void,
there shall be no liability on the part of the Key Companies or Columbus to the
other and all rights and obligations of any party hereto shall cease, except
that nothing herein shall relieve any party of any liability for (i) any breach
of such party's covenants or agreements contained in this Agreement, or (ii) any
willful breach of such party's representations or warranties contained in this
Agreement.

  SECTION 8.03. Amendment. This Agreement may be amended by the parties hereto
by action taken by or on behalf of their respective Boards of Directors at any
time prior to the Effective Time; provided, however, that, after approval of the
Merger by the stockholders of Columbus, (i) no amendment, which under applicable
law may not be made without the approval of the stockholders of Columbus, may be
made without such approval. This Agreement may not be amended except by an
instrument in writing signed by the parties hereto.

  SECTION 8.04. Waiver. At any time prior to the Effective Time, any party
hereto



                                                             A-51

<PAGE>



may (a) extend the time for the performance of any of the obligations or other
acts of the other party hereto, (b) waive any inaccuracies in the
representations and warranties of the other party contained herein or in any
document delivered pursuant hereto and (c) waive compliance by the other party
with any of the agreements or conditions contained herein. Any such extension or
waiver shall be valid only if set forth in an instrument in writing signed by
the party or parties to be bound thereby. For purposes of this Section 8.04, the
Key Companies as a group shall be deemed to be one party.

  SECTION 8.05. Fees, Expenses and Other Payments.

  (a) Except as provided in Section 8.05(c) and (d) of this Agreement, all
Expenses (as defined in paragraph (b) of this Section 8.05) incurred by the
parties hereto shall be borne solely and entirely by the party that has incurred
such Expenses; provided, however, that the allocable share of the Key Companies
as a group and Columbus for (i) all Expenses paid to financial printers for
printing, filing and mailing the Registration Statement and the Columbus Proxy
Statement and (ii) all SEC and other regulatory filing fees incurred in
connection with the Registration Statement and the Columbus Proxy Statement
shall be one-third by Columbus and two- thirds by Key; and provided further that
Key may, at its option, pay any Expenses of Columbus, and Key shall pay all SEC
filing fees.

  (b) "Expenses" as used in this Agreement shall include all reasonable out-of-
pocket third party expenses (including, without limitation, all fees and
expenses of counsel, accountants, investment bankers, experts and consultants to
a party hereto and its affiliates) incurred by a party or on its behalf in
connection with or related to the authorization, preparation, negotiation,
execution and performance of this Agreement, the preparation, printing, filing
and mailing of the Registration Statement and the Columbus Proxy Statement, the
solicitation of stockholder approvals and all other matters related to the
consummation of the transactions contemplated hereby.

  (c) Columbus agrees that if this Agreement is terminated pursuant to:

    (i) Section 8.01(b) and (x) such termination is the result of a willful
breach of any representation, warranty, covenant or agreement of Columbus
contained herein, (y) at any time within the period commencing on the date of
this Agreement through the date of termination of this Agreement Columbus shall
have initiated, solicited or encouraged (including by way of furnishing
information or assistance), or taken any other action to facilitate, any
inquiries or the making of any proposal relating to, or that may reasonably be
expected to lead to, any Competing Transaction, or entered into discussions or
negotiated with any person or entity in furtherance of such inquiries or to
obtain a Competing Transaction, or agreed to or endorsed any Competing
Transaction, or authorized or permitted any of the officers, directors or
employees of Columbus or any of its subsidiaries or any investment banker,
financial advisor, attorney, accountant or other representative retained by
Columbus or any of Columbus' subsidiaries to take any such action, and (z)
within twelve months after the date of termination of this Agreement, and with
respect to any person or group with whom the contacts or negotiations referred
to in clause (y) have occurred, a Business Combination (as defined in Section
8.05(e)) shall have occurred or Columbus shall have entered into a definitive
agreement providing for a Business Combination; or

    (ii) Section 8.01(f) because this Agreement and the Merger shall fail to
receive the requisite vote for approval and adoption by the stockholders of
Columbus at the



                                                             A-52

<PAGE>



Columbus Stockholders Meeting and at the time of such meeting there shall exist
a Competing Transaction; or

    (iii) Section 8.01(g), (h)or (i) and at the time of the termination there
shall exist a Competing Transaction;

then Columbus shall pay to Key an amount equal to $1,000,000, which amount is
inclusive of all of Key's Expenses.

  (d) Columbus agrees that if this Agreement is terminated pursuant to:

         (i) Section 8.01(f) because this Agreement and the Merger shall fail to
receive the requisite vote for approval and adoption by the stockholders of
Columbus at the Columbus Stockholders Meeting and at the time of such meeting
there shall not exist a Competing Transaction; or

         (ii) Section 8.01(i) because Arthur Andersen LLP would not deliver its
written opinion updated to the date of the Columbus Stockholders Meeting opining
that the Merger Consideration is fair from a financial point of view as of such
date and at such time there shall not exist a Competing Transaction;

then Columbus shall pay to Key an amount equal to Key's Expenses.

  (e) Key agrees that if this Agreement is terminated pursuant to Section
8.01(c) and such termination is the result of a willful breach of any
representation, warranty, covenant or agreement of Key contained herein, then
Key shall pay to Columbus an amount equal to $1,000,000, which amount is
inclusive of all of Columbus' Expenses.

  (f) Any payment required to be made pursuant to Section 8.05(c) or (d) of this
Agreement shall be made as promptly as practicable but not later than ten
business days after termination of this Agreement, and shall be made by wire
transfer of immediately available funds to an account designated by the
recipient, except that any payment to be made as the result of an event
described in Section 8.05(c)(i) shall be made as promptly as practicable but not
later than ten business days after the occurrence of the Business Combination or
the execution of the definitive agreement providing for a Business Combination.

  (g) For purposes of this Section 8.05, the term "Business Combination" means
(i) a merger, consolidation, share exchange, business combination or similar
transaction involving Columbus, (ii) a sale, lease, exchange, transfer or other
disposition of 20% or more of the assets of Columbus and its subsidiaries, taken
as a whole, in a single transaction or a series of transactions, or (iii) the
acquisition, by a person (other than Key or any affiliate thereof) or group (as
such term is defined under Section 13(d) of the Exchange Act and the rules and
regulations thereunder) of beneficial ownership (as defined in Rule 13d-3 under
the Exchange Act) of 20% or more of the Columbus Common Stock whether by tender
or exchange offer or otherwise.

                                   ARTICLE IX

                               GENERAL PROVISIONS

  SECTION 9.01. Effectiveness of Representations, Warranties and Agreements.

  (a) Except as set forth in Section 9.01(b) of this Agreement, the
representations,



                                                             A-53

<PAGE>



warranties and agreements of each party hereto shall remain operative and in
full force and effect regardless of any investigation made by or on behalf of
any other party hereto, any person controlling any such party or any of their
officers, directors, representatives or agents, whether prior to or after the
execution of this Agreement.

  (b) The representations, warranties and agreements in this Agreement shall
terminate at the Effective Time or upon the termination of this Agreement
pursuant to Article VIII, except that the agreements set forth in Articles I and
II and IX and Sections 6.07 and 6.09 shall survive the Effective Time and those
set forth in

Sections 5.04(d), 8.02 and 8.05 and Article IX hereof shall survive termination.
Nothing herein shall be construed to cause the Confidentiality Agreements to
terminate upon the termination of this Agreement pursuant to Article VIII.

  SECTION 9.02. Notices. All notices and other communications given or made
pursuant hereto shall be in writing and shall be deemed to have been duly given
upon receipt, if delivered personally, mailed by registered or certified mail
(postage prepaid, return receipt requested) to the parties at the following
addresses (or at such other address for a party as shall be specified by like
changes of address) or sent by electronic transmission to the telecopier number
specified below:

    (a) If to any of the Key Companies, to:

              Key Production Company, Inc.
              707 Seventeenth Street
              Suite 3300
              Denver, Colorado  80202-3404
              Attention: Monroe W. Robertson
              Telecopier No.: (303) 295-3494

    with a copy to:

              Holme Roberts & Owen LLP
              1700 Lincoln Street, Suite 4100
              Denver, Colorado 80203
              Attention: Nick Nimmo
              Telecopier No.: (303) 866-0200

    (b) If to Columbus, to:

               1660 Lincoln St., Suite 2400
               Denver, CO  80264
              Attention: President
              Telecopier No.: (303) 831-0135

    with a copy to:

              Sherman & Howard L.L.C.
              633 17th Street, Suite 3000
              Denver, Colorado 80202
              Attention: James F. Wood
              Telecopier No.: (303) 298-0940

  SECTION 9.03. Certain Definitions. For the purposes of this Agreement, the
term:



                                                             A-54

<PAGE>




    (a) "affiliate" means a person that directly or indirectly, through one or
more intermediaries, controls, is controlled by, or is under common control
with, the first mentioned person;

    (b) a person shall be deemed a "beneficial owner" of or to have "beneficial
ownership" of Columbus Common Stock or Key Common Stock, as the case may be, in
accordance with the interpretation of the term "beneficial ownership" as defined
in Rule 13d-3 under the Exchange Act, as in effect on the date hereof; provided
that a person shall be deemed to be the beneficial owner of, and to have
beneficial ownership of, Columbus Common Stock or Key Common Stock, as the case
may be, that such person or any affiliate of such person has the right to
acquire (whether such right is exercisable immediately or only after the passage
of time) pursuant to any agreement, arrangement or understanding or upon the
exercise of conversion rights, exchange rights, warrants or options, or
otherwise.

    (c) "business day" means any day other than a day on which banks in the
State of New York are authorized or obligated to be closed;

    (d) "control" (including the terms "controlled," "controlled by" and "under
common control with") means the possession, directly or indirectly or as trustee
or executor, of the power to direct or cause the direction of the management or
policies of a person, whether through the ownership of stock or as trustee or
executor, by contract or credit arrangement or otherwise;

    (e) "knowledge" or "known" shall mean, with respect to any matter in
question, if an executive officer of Columbus or Key, as the case may be, has
actual knowledge of such matter, and, with respect to Section 3.14, if Michael
M. Logan has actual knowledge of such matter;

    (f) "person" means an individual, corporation, partnership, association,
trust, unincorporated organization, other entity or group (as defined in Section
13(d) of the Exchange Act);

    (g) "Significant Subsidiary" means any subsidiary of Columbus or Key, as the
case may be, that would constitute a Significant Subsidiary of such party within
the meaning of Rule 1-02 of Regulation S-X of the SEC; and

    (h) "subsidiary" or "subsidiaries" of Columbus, Key, the Surviving
Corporation or any other person, means any corporation, partnership, joint
venture or other legal entity of which Columbus, Key, the Surviving Corporation
or any such other person, as the case may be (either alone or through or
together with any other subsidiary), owns, directly or indirectly, 50% or more
of the stock or other equity interests the holders of which are generally
entitled to vote for the election of the board of directors or other governing
body of such corporation or other legal entity.

  SECTION 9.04. Headings. The headings contained in this Agreement are for
reference purposes only and shall not affect in any way the meaning or
interpretation of this Agreement. Section references herein are, unless the
context otherwise requires, references to sections of this Agreement.

  SECTION 9.05. Severability. If any term or other provision of this Agreement
is invalid, illegal or incapable of being enforced by any rule of law or public
policy, all other conditions and provisions of this Agreement shall nevertheless
remain in



                                                             A-55

<PAGE>



full force and effect so long as the economic or legal substance of the
transactions contemplated hereby is not affected in any manner materially
adverse to any party. Upon such determination that any term or other provision
is invalid, illegal or incapable of being enforced, the parties hereto shall
negotiate in good faith to modify this Agreement so as to effect the original
intent of the parties as closely as possible in an acceptable manner to the end
that transactions contemplated hereby are fulfilled to the extent possible.

  SECTION 9.06. Entire Agreement. This Agreement (together with the Exhibits,
the Columbus Disclosure Schedule and the Key Disclosure Schedule) and the
Confidentiality Agreements constitute the entire agreement of the parties, and
supersede all prior agreements and undertakings, both written and oral, among
the parties or between any of them, with respect to the subject matter hereof.

  SECTION 9.07. Assignment. This Agreement shall not be assigned by operation of
law or otherwise.

  SECTION 9.08. Parties in Interest. This Agreement shall be binding upon and
inure solely to the benefit of each party hereto, and nothing in this Agreement,
express or implied (other than as contemplated by Section 6.07 and Section
6.09), is intended to or shall confer upon any other person any right, benefit
or remedy of any nature whatsoever under or by reason of this Agreement.

  SECTION 9.09. Specific Performance The parties hereby acknowledge and agree
that the failure of any party to perform its agreements and covenants hereunder,
including its failure to take all actions as are necessary on its part to the
consummation of the Merger, will cause irreparable injury to the other parties
for which damages, even if available, will not be an adequate remedy.
Accordingly, each party hereby consents to the issuance of injunctive relief by
any court of competent jurisdiction to compel performance of such party's
obligations and to the granting by any court of the remedy of specific
performance of its obligations hereunder.

  SECTION 9.10. Failure or Indulgence Not Waiver; Remedies Cumulative. No
failure or delay on the part of any party hereto in the exercise of any right
hereunder shall impair such right or be construed to be a waiver of, or
acquiescence in, any breach of any representation, warranty or agreement herein,
nor shall any single or partial exercise of any such right preclude other or
further exercise thereof or of any other right. All rights and remedies existing
under this Agreement are cumulative to, and not exclusive to, and not exclusive
of, any rights or remedies otherwise available.

  SECTION 9.11. Governing Law. This Agreement shall be governed by, and
construed in accordance with, the laws of the State of Delaware, regardless of
the laws that might otherwise govern under applicable principles of conflicts of
law.

  SECTION 9.12. Counterparts. This Agreement may be executed in multiple
counterparts, and by the different parties hereto in separate counterparts, each
of which when executed shall be deemed to be an original but all of which taken
together shall constitute one and the same agreement.





                                                             A-56

<PAGE>



  IN WITNESS WHEREOF, each of the parties hereto has caused this Agreement to be
executed as of the date first written above by their respective officers
thereunto duly authorized.

KEY PRODUCTION COMPANY, INC.


By:      /s/
         Monroe W. Robertson
         President and Chief
         Operating Officer

KEY ACQUISITION TWO, INC.


By:      /s/
         Monroe W. Robertson
         President

COLUMBUS ENERGY CORP.


By:      /s/
         Harry A. Trueblood, Jr.,
         Chairman of the Board, President, and
         Chief Executive Officer





                                                             A-57
<PAGE>


ANNEX B

     ARTHUR ANDERSEN GLOBAL ENERGY CORPORATE FINANCE GROUP FAIRNESS OPINION
                      TO THE BOARD OF DIRECTORS OF COLUMBUS



August 28, 2000

Board of Directors
Columbus Energy Corp.
1660 Lincoln Street, Suite 2400
Denver, Colorado 80264

Members of the Board:

You have asked us to advise you with respect to the fairness from a financial
point of view to the stockholders of Columbus Energy Corp. (the "Company") of
the Exchange Ratio pursuant to the terms of the Merger Agreement, dated as of
August 28, 2000 (the "Merger Agreement"), among the Company and Key Production
Company, Inc. (the "Acquiror"). The Merger, as proposed, generally provides for
the Company's stock to be converted into the right to receive 0.355 shares of
Acquiror common stock.

In connection with our analysis, we have been furnished certain documents and
other information concerning the Company and the Acquiror as we requested. We
have performed such due diligence, studies, analyses and inquiries as we
considered appropriate. Among other items we have considered, we have:

1) read certain publicly available business and financial information relating
to the Company and the Acquiror for recent years and interim periods to date;

2) read the Company's and Acquiror's internally prepared two-year Financial
Forecasts (2000-2001), prepared by management of the Company and Acquiror;

3) read Acquiror's internally prepared reserve report dated July 1, 2000 and the
Company's reserve report dated July 1, 2000 as prepared by outside petroleum
engineering consultants retained by the Company;

4) considered certain financial and stock market data of the Company and
Acquiror and compared that data with similar data for certain other companies,
the securities of which are publicly traded, which we believe may be similar or
comparable to the Company and Acquiror;

(5 considered the financial terms and related stock market data of certain
recent acquisition or business combination transactions in the oil and gas
industry;

(6 compared the estimated net asset value of the Company and Acquiror based on
estimated values of certain relevant assets and liabilities;

(7 considered the Company and Acquiror on a pro forma, combined basis in order
to estimate accretion to earnings and cash flow per share, and the effects of
cost savings and synergies;



                                                      B-1

<PAGE>


Board of Directors
Page 5
August 28, 2000





(8 compared certain operational and financial contributions of the Company and
Acquiror to a combined entity;

(9 held meetings and discussions with management, senior personnel to discuss
the business operations, assets, historical financial results and future
prospects of the Company and Acquiror; and

(10 conducted such other studies, analysis, inquiries and investigations, as we
deemed appropriate.

In our analysis and in formulating our opinion, we have assumed and relied upon
the accuracy and completeness of all the financial and other information
provided to us or publicly available, and we have not assumed any responsibility
for the independent verification of such information. We have further relied
upon the assurances of management of the Company and the Acquiror that they are
unaware of any facts that would make the information provided to us incomplete
or misleading in any respect. We have assumed that the financial forecasts and
projections provided to us by the Company and Acquiror were prepared in good
faith and on basis reflecting the best currently available judgments and
estimates of the Company's management. In addition, we have not conducted a
physical inspection of the properties or facilities of the Company or Acquiror
and have not made or obtained an independent valuation or appraisal of the
assets or liabilities of the Company or Acquiror. We express no view whatever as
to the federal, state or local tax consequences of the Merger.

Our services to the Company in connection with the Merger have been comprised
solely of financial advisory services and not accounting, audit or tax services.
Without limiting the foregoing, our services with respect to the Merger do not
constitute, nor should they be construed to constitute in any way, a review or
audit of or any other procedures with respect to any financial information nor
should such services be relied upon by any person to disclose weaknesses in
internal controls, financial statement errors or irregularities, or illegal acts
or omissions of any person affiliated with the Merger. Our opinion is
necessarily based on economic and market conditions and other circumstances as
they exist and can be evaluated by us on the date hereof. We shall have no
obligation to update this Opinion unless requested by you in writing to do so
and expressly disclaim any responsibility to do so in the absence of any such
request. Our opinion does not address nor shall it be construed to address the
underlying business decision to effect the Merger.

We have acted as financial advisor to the Company in connection with the
proposed Merger and will receive a fee for such services on the basis described
in our letter dated February 22, 2000. We have performed various auditing,
accounting and tax services for the Company and/or Acquiror in the past and have
received customary fees for the rendering of such services. We currently provide
various auditing, accounting and tax services for Acquiror.

It is understood that this letter is solely for the benefit and use of the Board
of



                                                             B-2

<PAGE>


Board of Directors
Page 6
August 28, 2000




Directors of the Company in its consideration of the Merger and may not be
relied upon by any other person, used for any other purpose or reproduced,
disseminated, quoted or referred to at any time, in any manner or for any
purpose without our prior written consent. This letter does not constitute a
recommendation to any stockholder with respect to whether to vote in favor of
the Merger or take any other action in connection with the Merger or otherwise,
and should not be relied upon by any stockholder as such. We are not expressing
any view as to the price or trading range of which the shares to be issued in
connection with the Merger may be sold or traded.

Based upon and subject to the foregoing, including the various assumptions and
limitations set forth herein, it is our opinion that as of the date hereof the
Exchange Ratio pursuant to the Merger Agreement is fair from a financial point
of view to the stockholders of the Company.

Very truly yours,


ARTHUR ANDERSEN GLOBAL ENERGY CORPORATE FINANCE GROUP






                                                             B-3

<PAGE>





                                                           [LOGO]
                                                    COLUMBUS ENERGY CORP.






<PAGE>





                                     PART II
                   INFORMATION NOT REQUIRED IN THE PROSPECTUS

ITEM 20.  INDEMNIFICATION OF DIRECTORS AND OFFICERS.

         Except to the extent indicated below, there is no charter provision,
by-law, contract, arrangement or statute under which any director or officer of
Registrant is insured or indemnified in any manner against any liability which
he or she may incur in his or her capacity as such.

         Under Section 145 of the General Corporation Law of the State of
Delaware (the "DGCL"), a Delaware corporation has the power, under specified
circumstances, to indemnify its directors, officers, employees and agents in
connection with threatened, pending or completed actions, suits or proceedings,
whether civil, criminal, administrative or investigative (other than an action
by or in right of the corporation), brought against them by reason of the fact
that they were or are such directors, officers, employees or agents, against
expenses, judgments, fines and amounts paid in settlement actually and
reasonably incurred in any such action, suit or proceeding. Article 6 of Key
Production's Bylaws provides for indemnification of each person who is or was or
is threatened to be made a party to any threatened, pending or completed civil,
administrative, criminal, arbitrative or investigative action, suit or
proceeding because such person is or was a director, officer or employee of Key
Production or is or was serving at the request of Key Production as a director,
officer, partner, trustee, fiduciary, agent or employee of another corporation
or of a partnership, joint venture, trust, employee benefit plan or other
enterprise, against judgments, fines, penalties, amounts paid in settlement,
reasonable expenses and other liabilities arising in connection with such
action, suit or proceeding, to the fullest extent permitted by law.

         Key also maintains policies of directors and officers liability
insurance.

         Section 102(b)(7) of the DGCL provides that a certificate of
incorporation may contain a provision eliminating or limiting the personal
liability of a director to the corporation or its stockholders for monetary
damages for breach of fiduciary duty as a director, provided that such provision
shall not eliminate or limit the liability of a director (i) for any breach of
the director's duty of loyalty to the corporation or its stockholders, (ii) for
acts or omissions not in good faith or which involve intentional misconduct or a
knowing violation of law, (iii) under Section 174 of the DGCL (relating to
liability for unauthorized acquisitions or redemptions of, or dividends on,
capital stock) or (iv) for any transaction from which the director derived an
improper personal benefit. Article IV of the Key Production's Charter contains
such a provision.

         The merger agreement dated August 28, 2000 between Registrant and
Columbus Energy Corp., a Colorado corporation ("Columbus"), provides that for
six years after the effective time, Registrant will indemnify and hold harmless
each person who was a director or officer of Registrant or Columbus prior to the
effective time from



                                                             II-1

<PAGE>


Board of Directors
Page 9
August 28, 2000




their acts or omissions in those capacities occurring prior to the effective
time to the fullest extent permitted by applicable law.

ITEM 21.  EXHIBITS AND FINANCIAL STATEMENT SCHEDULES.

    (a) The following exhibits are filed herewith unless otherwise indicated:



EXHIBIT NO.      DESCRIPTION
-----------      -----------

  2.1            Agreement and Plan of Merger, dated as of August 28, 2000, by
                   and among Registrant, Key Acquisition Two, Inc. and Columbus
                   Energy Corp. (attached as Annex A to the Proxy
                   Statement/Prospectus contained in this Registration
                   Statement)
  3.1          Certificate of Incorporation of the Registrant
                   (incorporated by reference to Exhibit 3.1 to the
                   Registrant's Registration Statement on Form S-4,
                   registration no. 33-23533 filed with the SEC on August 5,
                   1988).
 3.2           Amendment to Certificate of Incorporation of the
                   Registrant (incorporated by reference to Exhibit 3.2
                   to the Registrant's Registration Statement on Form
                   S-4, registration no. 33-23533 filed with the SEC on
                   August 5, 1988).
 3.3           Bylaws of the Registrant, as amended and restated on June
                   8, 1995 (incorporated by reference to Exhibit 3.3 to the
                   Registrant's Form 10-Q for the quarter ended June 30,
                   1995, file no. 0-17162).
 4.1           Form of Common Stock Certificate (incorporated by
                   reference to Exhibit 4.12 to the Registrant's Amendment
                   No. 1 to Registration Statement on Form S-4, registration
                   no. 33-23533 filed with the SEC on August 15, 1988).
  4.4            Description of Capital Stock of Registrant.
                   (incorporated by reference to Registrant's
                   Form 8-A Registration Statement, File No. 000-11769)
  5.1            Opinion of Holme Roberts & Owen LLP
                   regarding the legality of the shares of Registrant common
                   stock to be registered under this Registration Statement
  8.1            Form of Opinion of Sherman & Howard L.L.C.
                   regarding the United States federal income tax
                   consequences of the merger
 23.1            Consent of Arthur Andersen LLP (Key accountants)
 23.2            Consent of PricewaterhouseCoopers LLP (Columbus accountants)
 23.3            Consent of Arthur Andersen Global Energy Corporate Finance
                   Group (Columbus financial advisor)
 23.4            Consent of Reed W. Ferrill & Associates, Inc. (Columbus
                   engineers)
 23.5            Consent of Ryder Scott Company, L.P. (Key engineers)



                                                             II-2

<PAGE>


 23.6            Consent of Holme Roberts & Owen LLP
                   (contained in its opinion in Exhibit 5.1)
 23.7            Consent of Sherman & Howard L.L.C.
                   (contained in its opinion in Exhibit 8.1)
 24.1            Powers of Attorney of Registrant's Directors.  Contained on the
                          signature page of this registration statement

    Schedules are omitted because they either are not required or are not
applicable or because equivalent information has been included in the financial
statements, the notes thereto or elsewhere herein.

ITEM 22.  UNDERTAKINGS

    (a) The undersigned Registrant hereby undertakes:

         to file, during any period in which offers or sales are being made, a
post-effective amendment to this registration statement:

         (i)      to include any prospectus required by Section 10(a)(3) of
                  the Securities Act of 1933;

         (ii)     to reflect in the prospectus any facts or events arising
                  after the effective date of the registration statement (or
                  the most recent post-effective amendment thereof) which,
                  individually or in the aggregate, represent a fundamental
                  change in the information set forth in the registration
                  statement. Notwithstanding the foregoing, any increase or
                  decrease in volume of securities offered (if the total
                  dollar value of securities offered would not exceed that
                  which was registered) and any deviation from the low or high
                  end of the estimated maximum offering range may be reflected
                  in the form of prospectus filed with the Commission pursuant
                  to Rule 424(b) if, in the aggregate, the changes in volume
                  and price represent no more than a 20% change in the maximum
                  aggregate offering price set forth in the "Calculation of
                  Registration Fee" table in the effective registration
                  statement; and

         (iii)    to include any material information with respect to the plan
                  of distribution not previously disclosed in this registration
                  statement or any material change to such information in this
                  registration statement;

       PROVIDED, HOWEVER, that paragraphs a(1)(i) and (a) (1)(ii) do not apply
if the registration statement is on Form S-3, Form S-8 or Form F-3, and the
information required to be included in a post-effective amendment by those
paragraphs is contained in periodic reports filed with or furnished to the
Commission by the registrant pursuant to Section 13 or 15(d) of the Securities
Exchange Act of 1934 that are incorporated by reference in the registration
statement.



                                                            II-3

<PAGE>


         (2)      that, for the purpose of determining any liability under the
                  Securities Act, each such post-effective amendment shall be
                  deemed to be a new registration statement relating to the
                  securities offered therein, and the offering of such
                  securities at that time shall be deemed to be the initial bona
                  fide offering thereof;

         (3)      to remove from registration by means of a post-effective
                  amendment any of the securities being registered, which
                  remain, unsold at the termination of the offering.

         (4)      that, for purposes of determining any liability under the
                  Securities Act, each filing of the registrant's annual report
                  pursuant to Section 13(a) or 15(d) of the Securities Exchange
                  Act of 1934, as amended (the "Exchange Act") (and, where
                  applicable, each filing of an employee benefit plan's annual
                  report pursuant to Section 15(d) of the Exchange Act) that is
                  incorporated by reference in the registration statement shall
                  be deemed to be a new registration statement relating to the
                  securities offered therein, and the offering of such
                  securities at that time shall be deemed to be the initial bona
                  fide offering thereof;

         (5)      that prior to any public re-offering of the securities
                  registered hereunder through use of a prospectus which is a
                  part of this registration statement, by any person or party
                  who is deemed to be an underwriter within the meaning of Rule
                  145(c), the issuer undertakes that such re-offering prospectus
                  will contain the information called for by this Form S-4 with
                  respect to re- offerings by persons who may be deemed
                  underwriters, in addition to the information called for by the
                  other Items of this Form S-4;

         (6)      that every prospectus (i) that is filed pursuant to paragraph
                  (5) immediately preceding, or (ii) that purports to meet the
                  requirements of Section 10(a)(3) of the Securities Act and is
                  used in connection with an offering of securities subject to
                  Rule 415, will be filed as a part of an amendment to this
                  registration statement and will not be used until such
                  amendment is effective, and that, for purposes of determining
                  any liability under the Securities Act, each such
                  post-effective amendment shall be deemed to be a new
                  registration statement relating to the securities offered
                  therein, and the offering of such securities at that time
                  shall be deemed to be the initial bona fide offering thereof;

         (7)      insofar as indemnification for liabilities arising under the
                  Securities Act may be permitted to directors, officers and
                  controlling persons of the Registrant pursuant to the
                  foregoing provisions, or otherwise, the Registrant has been
                  advised that in the opinion of the Commission such
                  indemnification is against



                                                            II-4

<PAGE>



                  public policy as expressed in the Securities Act and is,
                  therefore, unenforceable.In the event that a claim for
                  indemnification against such liabilities (other than the
                  payment by the Registrant of expenses incurred or paid by a
                  director, officer or controlling person of the Registrant in
                  the successful defense of any action, suit or proceeding) is
                  asserted by such director, officer or controlling person in
                  connection with the securities being registered, the
                  Registrant will, unless in the opinion of its counsel the
                  matter has been settled by controlling precedent, submit to a
                  court of appropriate jurisdiction the question whether such
                  indemnification by it is against public policy as expressed in
                  the Securities Act and will be governed by the final
                  adjudication of such issue;

         (8)      to respond to requests for information that are incorporated
                  by reference into the prospectus pursuant to Items 4, 10(b),
                  11 or 13 of Form S-4, within one business day of receipt of
                  such request, and to send the incorporated documents by first
                  class mail or other equally prompt means. This includes
                  information contained in documents filed subsequent to the
                  effective date of the registration statement through the date
                  of responding to the request; and

         (9)      to supply by means of a post-effective amendment all
                  information concerning a transaction, and the company being
                  acquired involved therein, that was not the subject of and
                  included in this registration statement when it became
                  effective.





                                                            II-5

<PAGE>



                                   SIGNATURES

         Pursuant to the requirements of the Securities Act of 1933, as amended,
the Registrant has duly caused this Registration Statement to be signed on its
behalf by the undersigned, thereunto duly authorized, in the City of Denver,
State of Colorado, on the 12th day of September, 2000.

                                 Key Production Company, Inc.


                                 By: /s/ F.H. Merelli
                                 --------------------------------------------
                                          F.H. MERELLI
                                 Chairman and Chief Executive Officer

                                POWER OF ATTORNEY

  Each person whose signature appears below does hereby make, constitute and
appoint each of F.H. Merelli and Monroe W. Robertson as such person's true and
lawful attorney-in-fact and agent, with full power of substitution,
resubstitution and revocation to execute, deliver and file with the Securities
and Exchange Commission, for and on such person's behalf, and in any and all
capacities, this Registration Statement on Form S-4, and any and all amendments
(including post-effective amendments) thereto, with all exhibits thereto and
other documents in connection therewith, granting unto said attorneys-in-fact
and agents full power and authority to do and perform each and every act and
thing requisite and necessary to be done as fully to all intents and purposes as
such person might or could do in person, hereby ratifying and confirming all
that said attorney-in-fact and agent or such person's substitute or substitutes
may lawfully do or cause to be done by virtue hereof.

  PURSUANT TO THE REQUIREMENTS OF THE SECURITIES ACT OF 1933, THIS REGISTRATION
STATEMENT HAS BEEN SIGNED BY THE FOLLOWING PERSONS IN THE CAPACITIES INDICATED
ON SEPTEMBER 12, 2000.

         NAME AND SIGNATURE                               TITLE
         ------------------                               -----

          /s/ F.H. Merelli                Chairman, President and Chief
- -------------------------------------      Executive Officer (Principal
            F.H. Merelli                     Executive Officer)

       /s/ Paul Korus
------------------------------------------
         Paul Korus                        Vice President and Chief Financial
                                           Officer(Principal Financial and
                                           Accounting Officer)

      /s/ Cortlandt S. Dietler            Director
- -------------------------------------
        CORTLANDT S. DIETLER


      /s/ L. Paul Teague                  Director
- -------------------------------------
        L. Paul Teague


                                                            II-6

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