KEY PRODUCTION CO INC
S-4/A, 2000-11-14
CRUDE PETROLEUM & NATURAL GAS
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       As Filed with the Securities and Exchange Commission on November 14, 2000
                                                      Registration No. 333-45654



                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                            ------------------------
                    PRE-EFFECTIVE AMENDMENT NO. 1 TO FORM S-4

                             REGISTRATION STATEMENT
                                      UNDER
                           THE SECURITIES ACT OF 1933

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

                          Key Production Company, Inc.
             (Exact name of registrant as specified in its charter)
<TABLE>
<CAPTION>

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



                       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

<PAGE>


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

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 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. / /

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


         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.

                                                               November __, 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. Up to 1,545,469 Key shares may be issued in the merger to
Columbus shareholders, including Key shares reserved for issuance pursuant to
Columbus employee options. Key stockholders will continue to own their existing
shares of Key common stock after the merger. Key's common stock is traded on the
New York Stock Exchange under the symbol "KP."


         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 December __, 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 9.


         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 November __, 2000 and was
first mailed to Columbus shareholders on or about November __, 2000.




<PAGE>



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

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

                    Notice of Special Meeting of Shareholders

                         To Be Held on December __, 2000
                              --------------------

To the Shareholders of
Columbus Energy Corp.:


         A special meeting of shareholders of Columbus Energy Corp. will be held
on December __ , 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 November __,
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
November __, 2000

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



<PAGE>
<TABLE>
<CAPTION>

                                Table of Contents
                                                                                                          Page
<S>                                                                                                         <C>
Summary......................................................................................................2
Risk Factors.................................................................................................9
Key After the Merger........................................................................................10
Comparative Per Share Data..................................................................................10
Comparative Market Price Data...............................................................................11
Unaudited Pro Forma Combined Financial Information..........................................................12
The Columbus Shareholder Meeting and Proxy Solicitation.....................................................19
The Merger..................................................................................................22
The Merger Agreement........................................................................................41
Information Regarding Directors, Executive Officers and Five Percent Shareholders...........................49
Interests of Certain Executive Officers and Directors in the Merger.........................................50
Material United States Federal Income Tax Considerations....................................................51
Comparison of Shareholder Rights............................................................................53
Legal Matters...............................................................................................56
Experts.....................................................................................................56
Future Shareholder Proposals................................................................................57
Where You Can Find More Information.........................................................................57
Cautionary Statement Concerning Forward-Looking Statements..................................................59
Commonly Used Oil and Gas Terms.............................................................................59
Annex A-- Agreement and Plan of Merger*....................................................................A-1
Annex B--  Arthur Andersen Global Energy 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 August 31, 2000..........................D-1

</TABLE>


                     --------------------------------------
*  All references in Annex A to Arthur Andersen LLP should be read as Arthur
   Andersen Global Energy Corporate Finance Group (AA Corporate Finance)

           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 shareholders upon written or oral request to:


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
December ___, 2000, in order to receive them before the meeting.



<PAGE>

                                     Summary


           This summary 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 52. 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.


                                  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. Its operations are currently focused in western
Oklahoma, north Texas, the Mississippi Salt Basin, south Louisiana , northern
California, and Wyoming . 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."

                                       2
<PAGE>

                                   The Merger


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.



What Columbus shareholders will receive in the merger (see page 38)

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.

Votes required (see page 20)

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

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. Consequently, at least 18% of the outstanding Columbus common stock
will be voted for the merger. An additional approximately 8% 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. No Columbus stock is owned by Key.

Voting Procedures (see page 21)

To vote, 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. You
may change your vote by giving 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.

Directors and senior management of the combined company following the merger
(see page 45)

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.

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. The board recommends
approval of the merger even though the consideration offered by Key represented
a discount to the market price of Columbus' common stock on the date the board
approved the merger agreement.

Fairness opinion of Columbus' financial advisor (see pages 30 through 38)

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.

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 30
through 38.

Interests of officers and directors in the merger that differ from your
interests (see pages 46 through 47)

Some of the officers and directors of Columbus have 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.




                                       3
<PAGE>
                              The Merger Agreement


         The merger agreement is attached as Annex A to this document.




It contains representations, warranties and covenants by the parties, conditions
to each party's obligations and provisions relating to termination of the
agreement and termination fees that can become due. These provisions are
discussed under the caption "The Merger Agreement" beginning on page 38. In
addition to that discussion, we encourage you to read the entire merger
agreement because it is the legal document that governs the merger.

Conditions to the merger (see
page 40)

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

       o  the approval by the Columbus shareholders;

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

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

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 fees and expenses (see pages 43 through 44)

Fees of up to $1,000,000 could become due by either party on termination of the
merger agreement under the circumstances described under the caption "The Merger
Agreement" beginning on page 43.

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 11)

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 October 31, 2000, the last
reported sales price for Key common stock on the New York Stock Exchange was
$22.00. The last reported sales price of Columbus common stock on the American
Stock Exchange on October 30, 2000 was $7.25.


                                           4

<PAGE>

Material federal income tax
considerations (see pages   47
through 48)

Legal counsel to Columbus has delivered 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. You should review pages 47 through 48 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.



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 at June
30, 2000. Estimates by independent engineers show that proved reserves totaled
21.1 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 3.5 Bcfe, which were
partially offset by a 0.8 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.

       Specifically, proved producing reserves decreased 1.4 Bcfe which was due
to a well's lower performance in Bee County, Texas during the seven-month period
and initial lower production beginning in late July 2000 from another well
(previously classified as proved developed non-producing) in that area. Proved
developed producing reserves increased in the Laredo, Texas area with the
nonconsent interest assigned to Columbus in the Hachar #36 well but this
increase was offset by reserve reductions based on performance of wells in the
Sralla Road field of Texas.

       Proved developed non-producing reserves decreased 1.0 Bcfe with .5 Bcfe
attributable to the Morrow #23-1H revision after an operator's determination not
to recomplete the well. Also, reserves in a zone in a South Laredo well were
dropped after that zone was perforated and no production was seen. The decrease
in proved undeveloped reserves of 1.1 Bcfe was entirely the result of deleting a
location in the B.R. Cox field in South Texas after no response was received
from the new operator of the field to proceed to drill.

       Changes in the demand for oil and gas, price changes and other factors
make such reserve estimates inherently imprecise and subject to revision.




                                       5

<PAGE>

       As an outgrowth of the revised technical valuation and a downward
revision of 76,000 BOE of Columbus' proved reserves associated with its Morrow
#23-1H well in Louisiana, Columbus recognized a non-cash impairment expense of
$500,000 in its fiscal third quarter ending August 31, 2000.

       As of October 31, 2000, Columbus had reduced its long-term debt to $3.0
million from $4.4 million at August 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 dropped to less than $25,000 in September. A portion of
this decrease has been replaced by Columbus' 69% net revenue interest in the
Long #5 well, a recent completion, that generated 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 54.

      Summary Unaudited Pro Forma Combined Financial and Other Information


       The following unaudited pro forma condensed combined financial
information combines 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 12 through 19 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:


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



        o 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.

        o 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.


                                       6
<PAGE>
        o 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.

        o Expected annual cost savings from combining the operations of Key and
          Columbus and the 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 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.

<TABLE>
<CAPTION>

                Summary Unaudited Pro Forma Financial Information


                                                                            Six months  Ended             For the year ended,
                                                                              June 30, 2000               December 31, 1999
                                                                            -----------------             --------------------
                                                                                          (In thousands, except as
                                                                                                   indicated)
Income Statement Data:
<S>                                                                               <C>                                <C>
   Revenues                                                                       $      47,148                      $66,272
   Net income                                                                     $       9,502                      $ 6,035
   Basic earnings per share                                                       $        0.73                      $  0.47
   Diluted earnings per share                                                     $        0.70                      $  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)                                                                            9.922
   Gas (MMcf)                                                                            90,390
   Total Equivalent (Bcfe)                                                                149.9
</TABLE>




                                       7
<PAGE>

<TABLE>
<CAPTION>

                       Key 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
 Cash dividends per share........        --           --               --           --            --           --           --

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
 Book value per share............      7.06         6.17             6.63         6.05          5.65          4.83        4.03

</TABLE>
<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......................       26         (207)         (1,215)      (1,235)         2,167        2,098     (1,495)
 Basic earnings per
  share............................   0.01         (0.05)         (0.31)       (0.29)          0.50         0.50      (0.35)

 Diluted earnings per
  share............................   0.01         (0.05)         (0.31)       (0.29)          0.49         0.49      (0.35)
 Cash dividends per share........       --            --             --           --            --           --          --

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
 Book value per share............    3.34          3.59          3.37          3.77          4.62         5.14         4.30

</TABLE>


                                      8

<PAGE>
                                  Risk Factors


         In deciding whether to approve the merger, you should consider the
following risks related to 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.


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.

There will be no adjustment in the number of shares of Key common stock you will
receive if the trading price of the Key common stock goes down prior to the
closing date.

         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. The trading price of Key common stock
may decline prior to the closing date. 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 11.


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 you will receive when
the merger is completed.

If Columbus' field operations personnel quit after the merger, Key may
experience operational delays.

         Columbus' oil and gas properties are primarily located in areas in
which Key is not currently active. Even though Key has offered employment to all
of Columbus' field operations personnel, these employees may choose not to
continue to remain employed by us. If we are unable to replace these
individuals, we may experience operational delays that may impact future
financial performance.



                                       9

<PAGE>
                              Key After the Merger

         Increased financial strength. Our pro forma combined ratio of debt to
total book capitalization after the merger reflects an improvement to 35% from
38% on June 30, 2000. As a 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 operations in
South Texas and the Williston Basin of Montana/North Dakota.


         Expanded Cash Flow. In fiscal 1999, Key's net cash from operations was
$35.5 million and Columbus' was $3.3 million, or a pro forma combined amount of
$38.8 million, without adjustment for expected


cost savings. A 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 52. 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.


<TABLE>
<CAPTION>
                                                                                              Columbus
                                                                                --------------------------------------
                                                              Combined
                                                  Key       Company Pro                              Equivalent Pro
                                            Historical        Forma(1)              Historical(2)         Forma(3)
                                        ------------------- ------------------  ------------------ -------------------

<S>                                         <C>             <C>                     <C>                <C>
Net earnings (loss) per share--basic:       $ 0.81          $      0.73             $ 0.01             $ 0.26

   First six months of fiscal 2000
   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                 0.70               0.01               0.25
   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>

                                       10

<PAGE>

(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.

                          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.
<TABLE>
<CAPTION>

                                                                      Key                              Columbus
                                                       ----------------------------------  ----------------------------------
                                                            High               Low              High               Low
                                                       ----------------  ----------------  ----------------  ----------------
1998:
<S>                                                        <C>               <C>               <C>               <C>
 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....................     25.000            13.250             8.250             5.750
 Quarter Ending December 31, 2000 through
    October 31, 2000..................................     24.938            20.500             8.500             7.250

</TABLE>
---------------

(1)      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 October 31, 2000, the last reported
sales price for Key common stock on the New York Stock Exchange was $22.00. The
last reported sales price of Columbus common stock on the American Stock
Exchange on October 30, 2000 was $7.25. Columbus common stock did not trade on
the American Stock Exchange on October 31, 2000. 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.



                                       11

<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 52.

         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:

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

        o      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.

        o      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.

        o      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 services 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
               expected savings will result in reductions to expenses as
               reported in the accompanying unaudited pro forma combined
               statement of income.

        o      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. The final purchase price allocation will be determined
shortly after closing based on actual fair value of current assets, current
liabilities and long-term debt at that time, as well as the number of shares of


                                       12

<PAGE>
Columbus stock and stock options outstanding at closing. We do not expect the
final allocation to differ materially from the preliminary allocation shown
below. 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.


<TABLE>
<CAPTION>
                   Unaudited Pro Forma Condensed Balance Sheet
                                  June 30, 2000
                                 (In Thousands)
                                                                                        Pro Forma
          ASSETS                                       Key            Columbus         Adjustments               Combined

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
                                                  ---------------  ----------------                           ----------------
                                                             --          1,025             (1,025)(b)                    --

Deferred income taxes............................

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

Other assets, net................................         1,703            509                                        2,212
                                                  ---------------  ----------------                           ----------------
                                                     $  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
                                                  ---------------  ----------------                           ----------------
                                                         54,000            5,200                                     59,200
Long-term debt...................................

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>


                                       13

<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>                        <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               1,665(e)                19,411

 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                                       32,065
                                                  ---------------  ----------------                           ----------------
Income Before Income Taxes.......................    15,011             40                                       15,083

Provision for Income Taxes.......................     5,554             14                  13(g)                 5,581

Net Income.......................................   $ 9,457        $    26                                      $ 9,502
                                                  ===============  ================                           ================
Basic Earnings Per Share.........................   $  0.81        $   0.01                                     $  0.73
                                                  ===============  ================                           ================

Diluted Earnings Per Share.......................   $  0.77        $   0.01                                     $  0.70
                                                  ===============  ================                           ================

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>


                                       14
<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>
                   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
                                                  ---------------  ----------------                           ----------------

                                                    $ 6,804          $(1,215)                                     $  6,035
Net Income (Loss)................................
                                                  ===============  ================                           ================
Basic Earnings (Loss) Per Share..................  $   0.59          $ (0.31)                                     $   0.47
                                                  ===============  ================                           ================
Diluted Earnings (Loss) Per Share................   $  0.56          $ (0.31)                                     $   0.45

                                                  ===============  ================                           ================
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>




                                       15

<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 estimates that it 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 January 1, 1999.


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 in the following table. The final
         purchase price allocation will be determined shortly after closing
         based on actual fair value of current assets, current liabilities and
         long-term debt at that time as well as the number of shares of stock
         and stock options outstanding at closing. We do not expect the final
         allocation to differ materially from the preliminary allocation shown
         below.




                                       16

<PAGE>
<TABLE>
<CAPTION>
                                                                                              (In $ thousands,
Calculation and preliminary allocation of purchase price:                                    except share price)
                                                                                      -----------------------------------

<S>                                                                                           <C>
      Shares of Key common stock to be issued to Columbus stockholders..............           1,333
      Average Key stock price per share.............................................          $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 unproved properties.................................          $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 to the
book basis of the assets being acquired by Key for the deferred tax effect
resulting from the difference between the fair market value and historical
carryover tax basis of Columbus' oil and gas assets. The new book basis of the
oil and gas assets acquired by Key is in excess of the historical carryover tax
basis of the Columbus oil and gas properties.

(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 on January 1, 1999 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 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.


                                       17

<PAGE>

(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 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.

Estimated costs of the business combination total approximately $2.2 million,
consisting primarily of severance and separation pay for terminated Columbus
employees ($1 million), investment banking fees and related expenses ($675,000),
legal, accounting, and engineering consulting fees ($425,000), and printing,
mailing and other costs directly related to the merger ($100,000). Payment or
accrual of virtually all of these costs will occur either before or at closing
of the merger and will be recorded by Key and Columbus in the quarter in which
they are incurred. Columbus will expense approximately $2 million of the costs.
Key's estimated share of the total costs is $200,000 and will be capitalized as
direct costs associated with the transaciton.


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

For the twelve months ended December 31, 1999:
<TABLE>
<CAPTION>

                                                                                        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

Productive wells at December 31, 1999:

                                                         Oil                                     Gas
                                        -------------------------------------   -------------------------------------
                                              Gross                Net                Gross                Net
Area                                    -----------------   -----------------   -----------------   -----------------

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
                                        =================   =================   =================   =================
</TABLE>
                                       18
<PAGE>
Net undeveloped acres at December 31, 1999:

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
                                                           ------
                                                           159,38
<TABLE>
<CAPTION>

Estimated proved oil and gas reserves and standardized measure at June 30, 2000

                                                 Key                 Columbus(1)              Combined
                                         --------------------  -----------------------   -------------------
<S>                                        <C>                   <C>                       <C>
Oil (MBbls).............................   9,056                 866                       9,922
Gas (MMcf)..............................   79,758                10,632                    90,390
Equivalent (Bcfe).......................   134.1                 15.8                      149.9
Standarized measure of discounted
future net cash flows (MM)..............   $219.8                $26.4                     $246.2

</TABLE>

* 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 21.1 Bcfe, including 3.0 Bcfe
and 2.4 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 3.5 Bcfe
which were partially offset by a 0.8 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, based on Key's assumptions and economic
parameters, Key's engineers have estimated that proved reserves to be acquired
from Columbus at June 30, 2000, were 15.8 Bcfe, including 14.5 Bcfe of proved
producing reserves.

The Columbus Shareholder Meeting and Proxy Solicitation


Date, time and place

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


                                       19
<PAGE>
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 November __, 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. 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.



                                           20

<PAGE>
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 Each share
of Columbus common stock is entitled to one vote at the meeting. common stock
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.

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.




                                       21

<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 52.


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 formally
to consider steps to maximize shareholder value . In the course of its
deliberations the board discussed a number of factors including:

      o     the lack of market liquidity in Columbus' common stock;

            the historical prices for Columbus' common stock;

      o     the risks associated with continuing as a small independent oil and
            gas exploration company, in light of the increasing consolidation in
            the oil and gas industry, which had the effect of increasing
            competitive pressures on earnings and growth and reducing the
            universe of acquirers and merger partners for Columbus;

      o     the then existing current decline in oil prices that had depressed
            the oil and gas industry;

      o     the limited prospects for growth of Columbus' assets and earnings
            from internal sources; and

      o     the relatively limited potential for increased shareholder value
            from continued independent operations or from deferring an
            acquisition of the Company.

Based on these discussions the board of directors concluded that the interests
of Columbus shareholders would likely be best served by considering a business
combination.

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




                                       22

<PAGE>

      The board of directors of Columbus, with the assistance of AA Corporate
Finance, conducted a financial review of Columbus and developed a list of
potential bidders based upon a number of factors, including the likelihood of
interest by the potential bidder in pursuing a business combination with
Columbus, the ability to successfully acquire and integrate Columbus'
operations, and the price and liquidity of the potential bidder's stock . In
early April 2000, Columbus contacted approximately 120 companies to solicit
their interest in a possible combination with or purchase of Columbus. Columbus
informed each potential bidder that if it were interested in seeking to acquire
or merge with 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
non-binding proposal by May 8, 2000. The potential bidders were advised that it
was Columbus' strong preference that any proposed transaction be structured so
as to be tax-free to Columbus shareholders, but the board would consider other
alternatives, including a cash purchase of the outstanding shares of Columbus.
Thirty-five of these companies requested and received the confidential
information memorandum.

      Eighteen companies, including Key, submitted preliminary offers to merge
with or to purchase the outstanding stock of Columbus by the May 8, 2000 due
date. After reviewing the preliminary proposals with the assistance of AA
Corporate Finance, Columbus selected seven companies, including Key, to continue
in the process based upon the value of the merger consideration in the
preliminary proposals and their fit with the other bidder criteria established
by the board, including the quality of their prospects, levels of debt, and the
liquidity and potential for an increase in the price of the bidder's stock. Of
these seven companies, three had submitted preliminary proposals for a tax-free
merger with Columbus, two had submitted proposals for a cash purchase, and two
had submitted proposals for either a cash purchase or a merger. Five of the
seven selected bidders elected to conduct detailed due diligence with respect to
Columbus. This included meeting with representatives of Columbus management, AA
Corporate Finance, and Columbus' outside independent engineers and geologic
consultants, and reviewing documentation related to Columbus' business and
operations. These potential bidders were advised that they were to submit formal
offers by June 21, 2000.


      Based on Key's review of Columbus' 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 a tax-free merger with 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 further 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. AA
Corporate Finance reported that of the five companies that elected to review the
more detailed data regarding Columbus, two submitted proposals -- one from Key,
an oil and gas exploration company, and one from a diversified company with oil
and gas and electric utility interests. Both of the proposals were for a
tax-free merger with Columbus. Two of the companies did not submit a proposal
because of a lack of strategic fit. One other company did not submit a proposal
due to internal considerations.

      Key's proposal was the equivalent of an acquisition of Columbus at $6.25
per share while the other proposal was at $4.84 per share. Both of these
valuations were calculated based upon intraday prices during AA Corporate
Finance's presentation on June 26, 2000 of the Columbus common stock, on the one
hand, and the common stock of Key and the other bidder, on the other hand. Both
proposals were subject to standard terms and conditions. Based upon the market
price of the Columbus common stock of $6.88 and the market price of Key's common
stock of $18.06, during the meeting on June 26, 2000, the Key proposal
represented a discount of 9.1%, and the other proposal represented a discount of
29.7% from the current


                                       23

<PAGE>

market price. Following AA Corporate Finance's presentation, the board informed
AA Corporate Finance that both proposals were lower than had been expected since
they were lower than the corresponding preliminary proposals from these two
bidders.

      AA Corporate Finance advised the board that the formal proposals were
lower as a result of the specific reserve valuation parameters for acquisitions
used by the two bidders in analyzing Columbus' reserves. Although the estimates
of proved reserves prepared by Columbus' independent engineers were conducted in
accordance with industry standards, whether a bidder would characterize those
same properties as proved reserves depends on the bidder being able to
demonstrate with reasonable certainty, based upon its own existing economic and
operating conditions, that these reserves would be economically recoverable by
them. As a result, companies may classify some reserves differently based on
their own operating costs, production methods, recovery techniques,
transportation and marketing arrangements, and risk factors. In determining the
price of their proposals, each of the bidders assigned a value only to those
properties that it could classify as proved reserves. As a result, not all of
the Columbus properties were assigned a value, which had the effect of lowering
the price included in the proposals. AA Corporate Finance noted that the two
proposals had classified and therefore valued the same Columbus reserves
differently in several instances.

      After AA Corporate Finance's presentation and the board's review
and discussion of each of the proposals, the board extended the formal proposal
due date until July 7, 2000, and requested that AA Corporate Finance ask both
bidders whether they had considered selected properties of Columbus to determine
if they could classify specific properties as proved reserves for purposes of
the acquisition and to consider the value of the cash flow from Columbus'
operations services, both of which would support an increase in the merger
consideration. Thereafter, AA Corporate Finance separately met with
representatives of Key and the other bidder to discuss these matters.


On July 5, 2000, representatives from Columbus met with members of Key's
management to discuss Key's initial proposal , technical differences in the
evaluations by the parties of Columbus' oil and gas reserves, and Key's
operations and corporate objectives. 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, all of whom are petroleum engineers.
Representatives from Key included Monroe R. Robertson, Key's president and COO,
Joseph Albi, Key's vice president of engineering, and Gary Abbott, one of Key's
petroleum engineers. Later that day, Tom Jordan, vice president of exploration,
and other members of Key's geological staff, presented to Messrs. Trueblood,
Brown and Butler detailed information regarding Key's present and future
prospects, including its prospect data, seismic information, well logs,
geological information, reserve data and other nonpublic information.

      On July 7, 2000, during a regular board meeting, the board reviewed the
status of the ongoing discussions with the two bidders. AA Corporate Finance
reported to the Columbus board that Key had increased its offer from 0.346
shares to 0.352 shares of Key common stock for each share of Columbus common
stock and would further increase its offer as soon as it completed additional
due diligence concerning Columbus' reserve information. This additional due
diligence could not be done until the early part of the following week. AA
Corporate Finance reviewed in detail the Key proposal and noted that the Key
proposal now represented a 16.1% discount from the closing price of Columbus'
common stock on July 6, 2000, which had risen to $7.00 per share.

      AA Corporate Finance also reported that Columbus had received a revised
formal proposal from the other bidder. The other bidder increased its offer to
$5.56 per share based on the July 6, 2000, closing price of the other bidder's
common stock. The revised proposal was conditioned on obtaining regulatory
approvals. The offer expired



                                       24

<PAGE>

at the close of business on July 7, 2000. The revised proposal represented a
discount of approximately 21.2% to the closing price of $7.00 per share for the
Columbus common stock on July 6, 2000.

      AA Corporate Finance also again reviewed in detail the bidding process. AA
Corporate Finance explained that it had also analyzed the proposals based on the
period from January 1, 2000 to May 29, 2000 in order to compare the revised
offers to a period before the recent price increases in Columbus' stock, which
AA Corporate Finance believed were as a result of the market's expectation of
the proposed sale. During that period the Columbus common stock did not trade
above $6.00 and the average market price of the Columbus common stock was $5.62.
Relative to the closing price of each bidders' stock on July 6, 2000, the Key
proposal would represent a 4.6% premium, while the other proposal represented a
discount of 1.8%. At this point AA Corporate Finance was excused from the
meeting while the board considered each of the two proposals.

      The board first discussed the fact that each of the proposals represented
a discount from the current market price for the Columbus common stock and
discussed whether to proceed with either transaction. In light of the fact there
had been a recent increase in the current market price that most likely
reflected the market's reaction to the expectation of a business combination,
the board gave more weight to the comparison of the proposals to the average
market price of the Columbus common stock from January 1, 2000 through May 29,
2000, prior to the recent increase. Based on those prices, Key's proposal
represented a premium of approximately 4.6% and the other proposal represented a
discount of 1.8% over the average market price of Columbus during that period,
relative to the closing price of each bidders' stock on July 6, 2000. The board
revisited the fact that the process began with contacting over 120 companies and
had resulted in only two formal proposals from the seven selected preliminary
offers. They considered whether they should reopen the process to some of the
original proposed bidders or attempt to find additional bidders. The board
concluded that was not a viable alternative and no other third parties meeting
the board's criteria had expressed an interest in a business combination after
Columbus' public announcement that it was considering a strategic combination.
In addition, the board believed that both bidders had the potential for capital
appreciation in their stock price. There was additional discussion about the
information obtained in the meeting on July 5, 2000 with Key personnel and a
review of analyst reports, which lead the board to conclude that Key's recent
common stock price represented an undervaluation of its assets by the market.
Because oil and gas prices had increased significantly since the beginning of
2000, the board considered remaining as an independent company but concluded
that doing so would not be in the best interests of shareholders because the
continuing consolidation in the industry would probably make Columbus less
competitive, and therefore an even less attractive merger partner, in the
future. In addition, because of increasing development costs, the board believed
that Columbus' prospects for growth from internal sources were significantly
limited. In determining whether to proceed with a transaction, the board also
considered the following factors:

     o      the recent lack of interest by investors in oil and gas companies
            with a market capitalization similar to Columbus compared to that of
            larger independent companies;

     o      large fluctuations in crude oil and natural gas prices in recent
            years, including the recent increase in those prices;

      o     the board's belief that Columbus would be unable to raise a
            significant amount of capital in the future without diluting current
            shareholders.

      The board concluded that the process had most likely yielded the maximum
value for Columbus available and therefore decided to compare the two offers.
After lengthy discussion, the board decided to pursue the offer by Key, but not
the other bidder. In reaching its decision to pursue the Key offer, the board
considered the following:

     o      the Key offer represented a premium compared to the proposal by the
            other bidder;

     o      the Key offer provided greater market liquidity, an important factor
            for Columbus in strategic combination, than the other offer. Key's
            market volume was 77.4% higher during the first six months of 2000
            than the other bidder's;

     o      the board's belief that Key offered a greater opportunity for growth
            and stock price appreciation than the



                                       25

<PAGE>

            other bidder based on its evaluation of the nonpublic information
            presented by Key and the favorable impression Columbus' management
            had of Key's management and technical personnel;

      o     the other bidder's proposal was contingent on regulatory approvals,
            which Key's was not, that might have delayed or prevented the
            closing of the transaction;

      o     Key, as an oil and gas exploration company, provided a better
            strategic fit and Key could more effectively exploit Columbus'
            assets (in particular, Key could use Columbus' positive cash flow to
            accelerate drilling on its prospects);

      o     the fact that the other offer terminated the same date as the
            meeting and the other bidder indicated it would not extend the terms
            of the offer, and therefore Columbus would not have an opportunity
            for further negotiations; and

      o     since January 2000, the common stock of Key had appreciated
            approximately 128%, while the common stock of the other bidder had
            appreciated only 6.9%, although the board did not expect that this
            appreciation for Key's common stock necessarily would continue at
            that rate.

      Following the board's discussion, the board authorized 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, senior 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



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 related to each company's reserves information.

      Upon further detailed review by Key engineers of the technical data
pertaining to some of the wells operated by Columbus and the cash flow from
Columbus operations services, on July 14, Key revised the terms of its merger



                                       26
<PAGE>




proposal by increasing the exchange ratio from 0.352 shares to 0.355 shares of
Key common stock for each Columbus share, a ratio which represented a discount
of approximately 14%, based on the relative market prices of Columbus' common
stock and Key's common stock on July 14, 2000.

      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. Throughout the rest of July Columbus' and Key's executives and
counsel negotiated the terms of the definitive merger agreement. The material
issues discussed throughout these negotiations included:

     o     price protection measures, including consideration of a price collar;

     o     whether and for how long there would be  indemnification of the
           officers and directors of Columbus by Key following the merger;

     o     the terms of severance to employees of Columbus who would not be
           hired by Key;

     o     the assumption of Columbus stock options by Key and their terms; and

     o     appropriate provisions and fees for termination of the merger
           agreement.

These discussions did not include further negotiation of the exchange ratio.

      On August 8, 2000, Mr. Logan and counsel for Columbus met with Messrs.
Bell, Albi, and Korus, and counsel for Key to discuss some of the outstanding
issues. Columbus proposed several alternative price collars for the exchange
ratio, but Key held firm on its position not to include any collar. The parties
also discussed but did not resolve the duration of the indemnification for
officers and directors of Columbus, the vesting and term of Columbus stock
options, and termination provisions.

      Informal discussions of these issues continued during the following week
between Messrs. Logan and Bell and on August 15, 2000, Messrs. Logan and Bell
and counsel for Columbus and Key met and during the meeting completed
negotiation of the termination provisions. Further, the parties reached
agreement on which of those provisions would require Columbus to pay a break-up
fee and when it would be appropriate only to pay Key's expenses. Columbus
requested a cap on Key's expenses in the event Columbus would be obligated to
pay those expenses, but Key refused to agree to this limitation. Finally, Key
agreed to Columbus' request that indemnification of its officers and directors
be for a term of six years. At the conclusion of this meeting, the parties had
orally agreed to all material terms of the merger and no further negotiations on
material terms were held. However, both parties understood that neither party
was legally committed to the other to proceed with the transaction.

      On the same day, 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, each of Columbus' management and its legal and financial advisors
reviewed with the board one or more of the following:

       o    the principal terms of the merger agreement;

       o    the potential benefits and risks of the transaction with Key;

       o    the rationale for and financial analysis relating to the proposed
            merger;



                                       27

<PAGE>

       o    a detailed review of the bidding process; and

       o    an updated report on Columbus' due diligence investigations of Key.

      Columbus' counsel outlined the legal considerations for the board in
discharging its fiduciary responsibilities in connection with its deliberations.
AA Corporate Finance then summarized the material financial analyses that they
had conducted related to the proposed transaction (as more fully described under
the heading "-- Fairness Opinion Columbus Financial Advisor" below), which
included the following:

       o    comparable transactions analysis;

       o    contribution analysis;

       o    pro forma merger consequences analysis;

       o    net asset value (NAV) analysis;

       o    premiums paid analysis;

       o    stock price ratio history analysis; and

       o    comparable company trading analysis.

      After a description of these analyses, AA Corporate Finance rendered to
the Columbus board of directors its oral opinion, subsequently confirmed by
delivery of a written opinion, to the effect that, as of that date and based on
and subject to the matters described in the opinion, the exchange ratio pursuant
to the merger agreement with Key was fair, from a financial point of view, to
the shareholders of Columbus.




      The board noted that the exchange ratio for the Key proposal was within
the range of implied exchange ratios for the contribution and net asset value
analyses and considered the results of the other analyses conducted by AA
Corporate Finance. The board noted that the stock price analysis implied an
exchange ratio of .365 to .405, whereas the exchange ratio offered by Key was
 .355. The board also noted that although the premiums paid analysis implied an
exchange ratio of .343 to .486, the actual premium (or discount) was well below
the average of the selected comparison transactions. In evaluating the fact that
the stock price analysis yielded an implied exchange ratio higher than that
being offered by Key, the board considered that the analysis was primarily based
on the period after the recent increase in the market price of Columbus' stock,
which the board had attributed to market expectation of a proposed transaction
and its belief that the price of Key's common stock was below its asset value.
In considering the premiums paid analysis, which showed that the price being
offered in the proposed transaction was well below the average of the selected
comparison transactions, the board noted that the exchange ratio was within,
although at the lower end of, the implied exchange ratio range for that
analysis.

      The board again discussed the bidding process that resulted in the Key
proposal and concluded that the process had produced the best price available at
this time for Columbus shareholders. The board also reiterated its belief that
by postponing the transaction Columbus would become less competitive and a less
attractive merger partner in the future. Following further discussion, the
Columbus board unanimously:



                                       28

<PAGE>

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

       o    approved the merger agreement and the merger;

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

       o    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 . 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.


 Key and Columbus 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.

     o    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. Because the combined enterprise will have
          greater borrowing capacity and a larger base of operating cash flow
          than either company had individually, Key and Columbus believe that
          the merger will enable the new company to make larger investments in
          exploration and development projects or acquisitions of producing
          properties than either company could have done separately. As of June
          30, 2000, Key's bank credit facility borrowing base was $85 million
          and Columbus' was $10 million. We anticipate that the borrowing base
          of the combined enterprise will be at least equal to the sum of the
          two separate facilities, or $95 million. In fiscal 1999, Key's net
          cash from operations was $35.5 million and Columbus' was $3.3 million,
          or a pro forma combined amount of $38.8 million, without adjustment
          for expected cost savings.

      o   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. 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.

      o   Key and Columbus believe the merger creates the opportunity for
          significant 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 result in approximately $2.0 million of annual
          cost savings, which Key hopes to achieve by:

                 o    eliminating duplicative administrative and executive staff
                      ($1.5 million);

                 o    consolidating corporate headquarters ($0.250 million); and

                 o   eliminating outside service costs such as travel, legal,
                     audit and data processing costs ($0.175 million).


                                       29
<PAGE>
Columbus' reasons for the merger; recommendation of the Columbus board.

         In reaching its decision 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 its 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 various factors including those mentioned in "-- Background of the
Merger" on pages 22 to 27, and the following:

        o the factors considered by the board at its July 7, 2000 meeting in
          deciding to pursue the offer by Key (see pages 24 and 25);

        o that Key had increased the exchange ratio after its initial formal
          proposal;

        o the 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 in its
          opinion, the merger consideration was fair from a financial point of
          view to the shareholders of Columbus (see "-- Fairness Opinion of
          Columbus' Financial Advisor" on pages 30 to 38);

        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;

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

        o 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 and the fact that the merger agreement does not
          include many of the types of conditions to closing that might lend
          additional uncertainty to the transaction (such as consents by third
          parties other than shareholders). See "The Merger Agreement" on page
          38, "-- Conditions to the Merger" on page 40, "-- Other Acquisition
          Proposals" on page 42 and "-- Termination" on page 43;

        o the process undertaken by senior management with the assistance of AA
          Corporate Finance to identify and solicit indications of interest from
          selected bidders had exhausted the field of possible acquirers and
          resulted in an increase in the merger consideration offered to
          Columbus (see "-- Background of the Merger");

        o the fact that Key's was one of only two formal proposals submitted and
          that no additional potential acquirer or strategic partner satisfying
          the board's criteria had expressed an interest in engaging in a
          business combination or other strategic transaction since Columbus
          announced its interest in a strategic combination in February 2000;

        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, based
          upon the review of the confidential nonpublic data presented by Key;

        o the financial condition, results of operations, business and prospects
          of Key and the risks involved in developing those prospects;

        o the financial condition, results of operations, business and prospects
          of Columbus; and

        o the interest of Columbus' management in the merger as described in
          "Interests of Certain Executive Officers and Directors in the Merger"
          on page 46.


                                       30
<PAGE>
         The discussion of the information and factors considered by the board
is not intended to be exhaustive, but includes the material factors considered
by the board. 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 the opinion 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 but not exclusive factor in
determining whether to approve the merger agreement. The board noted that the
exchange ratio for the Key proposal was within the range of implied exchange
ratios for the other analyses. The board also noted that the stock price
analysis yielded an implied exchange ratio higher than that being offered by
Key. The board further noted that the premiums paid analysis showed that the
price being offered in the proposed transaction was well below the average of
the selected comparison transactions,


although the exchange ratio was within the implied exchange ratio range for that
analysis.

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

        o the exchange ratio represented a discount to Columbus' current share
          price;

        o the fact that the market price of the Key common stock could decline,
          resulting in a further discount from the market price of the Columbus
          common stock;

        o the board's belief about the favorable long-term prospects of Key may
          not be realized;

        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;



        o the risk that the expected benefits of the merger might not be fully
          realized; and

        o other applicable risks described in thiso prospectus/proxy statement
          under "Risk Factors."

         Further, the board concluded that, on balance, the potential benefits
of the merger described above outweighed these risks.


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



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.


                                       31
<PAGE>
The Columbus board selected AA Corporate Finance as its financial advisor
because of its expertise and reputation and its experience in transactions
comparable to the merger. 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. The form and amount of the consideration to be paid by Key in
the merger was determined through arm's length negotiations between Key and
Columbus.

         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
non-public information, provided by Columbus and Key, including the following
items which AA Corporate Finance deemed to be material in its analysis:

        o Internal two-year financial forecasts (2000-2001), prepared
          respectively by Columbus' and Key's management;

        o Columbus' internal financial statements through and for June 30, 2000;

        o Key's internally prepared reserve report dated July 1, 2000 and the
          Columbus' reserve report dated July 1, 2000 as prepared by Columbus'
          independent engineers;

        o A Key forecast for the acquisition of Columbus (2000 - 2009);

        o Columbus' undeveloped acreage detail as of July 1, 2000; and

        o Key's (June 30, 2000) and Columbus' (May 31, 2000) outstanding options
          detail.

         AA Corporate Finance also 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 general and
administrative expense savings and a change in accounting method (depreciation)
 . 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 above public or
non-public 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


                                       32
<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
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.


                                       33

<PAGE>

         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. These transactions are comparable to Columbus due to
the similar geographic location of the reserves involved.

         As of June 30, 2000, Columbus had approximately 70% of its total
un-risked proved reserves in the Onshore Texas Gulf Coast region, and 30% in the
Rocky Mountain region. AA Corporate Finance calculated the weighted average
reserve transaction value multiple based on total un-risked proved oil and gas
reserves for the above 41 transactions. AA Corporate Finance then multiplied the
weighted average reserve transaction value multiple for the Onshore Texas Gulf
Coast and Rocky Mountain regions by Columbus' percentage reserves within those
regions to derive an implied value ($/Mcfe).



The following summary table presents the weighted average reserve transaction
value multiples and the implied value ($/Mcfe) based on Columbus' total
un-risked proved reserves by region:



<TABLE>
<CAPTION>

                                                                                               $/Mcfe
                                                             -----------------------------------------------------------------------
                                                                     Gulf Coast -                 Rocky
                                                                     Onshore                     Mountains           Implied Value
                                                             -----------------------   -----------------------   -------------------
<S>                                                                    <C>                       <C>
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

</TABLE>



                                       34

<PAGE>

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

         In conclusion, AA Corporate Finance believes that the implied
$1.16/Mcfe price paid for Columbus' reserves compares favorably to the 41 other
reserve transactions in the Onshore Texas Gulf Coast and Rocky Mountain regions
from January 1, 1999 to August 25, 2000 as reported in J.S. Herold, Inc.'s
Herold M&A Transaction Review with a weighted average $/Mcfe price paid of
$0.88.

         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 natural gas liquid
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.

         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 twelve months ended June 30, 2000 and the years 2000 and 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-recurring items. The following table illustrates the
analysis described above:

<TABLE>
<CAPTION>

                                                                        ($000s)
                                       Columbus                                 Key                    Columbus' Contribution
                           ------------------------------------  ----------------------------------      to Combined Company
                                                                                                      --------------------------
                           LTM2 6/30    2000E3       2001E       LTM 6/30      2000E       2001E      LTM 6/30   2000E    2001E
                           ---------    ------       -----       --------      -----       -----      --------   -----    -----
<S>                            <C>        <C>          <C>        <C>         <C>          <C>        <C>         <C>      <C>
Total Production (MMcfe)       4,026      4,024        3,614      22,821      23,691       25,411     15.0%       14.5%    12.5%
Revenue1                     $12,645    $15,474      $14,467     $75,002     $97,271      $99,284     14.4%       13.7%    12.7%
EBITDAX                      $ 8,466    $10,896      $10,066     $59,091     $79,062      $78,392     12.5%       12.1%    11.4%
Discretionary Cash Flow      $ 9,147    $ 9,284      $10,077     $55,875     $75,401      $74,544     14.1%       11.0%    11.9%
Net Income                   $   698    $ 2,422      $ 4,248     $14,920     $27,221      $28,991      4.5%        8.2%    12.8%
</TABLE>


--------------------------------------
1 Excluding Columbus' management/operating services revenue
2 LTM means the latest twelve months.
3 E refers to estimated.

         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
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
general and administrative expense savings and a change in accounting method
(depreciation) as estimated by management and illustrated in the table below.
Oil and gas prices used in the following financial projections are based on the
NYMEX futures price as of 8/15/00 for the relevant period. Adjustments were made
by Columbus' and Key's management to the oil and gas price forecasts to reflect
location and quality differentials.





                                       35

<PAGE>
<TABLE>
<CAPTION>

                                                            2001E (000s)
                                           -------------------------------------------------------
                                           Key        Columbus     Adjustments     Pro Forma          % Accretion
                                           ---        --------     -----------        Key             -----------
                                                                                   ---------          (Dilution)
                                                                                                      ----------
<S>                                        <C>          <C>          <C>            <C>
Revenues                                   $  99,284    $ 14,467     $     ---      $ 113,751

Leasing Operating & Production Taxes       $  18,047    $  3,301     $     ---      $  21,348
G & A                                      $    2,845   $  1,100     $    (600)     $   3,345(1)
                                          ----------   ----------    -----------     ----------

EBITDAX                                    $  78,392    $ 10,066     $     600      $  89,058

DD&A                                       $  31,417    $  3,000     $   3,959      $  38,376(2)
Exploration Expense                              ---    $    250     $    (250)     $     ---(3)
                                            ======== ============    ===========  =============

EBIT                                       $  46,975    $  6,816     $  (3,109)     $  50,682

Interest (Expense)                         $  (1,160)   $   (115)    $     ---      $  (1,275)
Interest Income                            $     202    $    150     $     ---      $     352
Other Income (Expenses)                    $     ---    $    ---     $     ---      $     ---
                                      ===========================  =============   ===========

Earnings Before Income Taxes               $  46,017    $  6,851     $  (3,109)     $  49,759

Income Tax Provision (Benefit)             $  17,026    $  2,603     $  (1,151)     $  18,479(4)
                                          ==========   ==========     ==========    =========

Net Earnings (Loss)                        $  28,991    $  4,248     $  (1,959)     $ 31,280
Average Diluted Shares                        12,742       3,752        (2,420)       14,074(5)

Diluted EPS                                $    2.28    $   1.13           N/A      $   2.22              (2.3%)
                                          ==========  ===========          ===      ========

Diluted Discretionary Cash Flow            $    5.85    $   2.69           N/A      $   6.06               3.5%
                                          ==========  ===========          ===      ========
Per Share
------------------------------------
</TABLE>


(1)    Estimated general and administrative expense savings
(2)    Estimated incremental Columbus depreciation, depletion and amortization
       associated with change in accounting method from successful efforts to
       full cost
(3)    Elimination of Columbus' Exploration Expense due to change in
       accounting method from successful efforts to full cost
(4)    Tax effect of adjustments 1 through 3 at an assumed tax rate of 37%
(5)    Elimination of Columbus shares outstanding in excess of Key shares issued
       in the Merger


                                       36
<PAGE>
         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 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 (West Texas Intermediate) 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 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.


                                       37
<PAGE>

         The following table illustrates the four scenarios described above:

<TABLE>
<CAPTION>

                                                                                       Columbus
                                                Case I                   Case II                Case III              Case IV
                                                -------                  -------                ---------             -------
                                              (PV-10)   (PV-15)   (PV-10)     (PV-15)   (PV-10)    (PV-15)   (PV-10)  (PV-15)
                                              -------   -------   -------     -------
<S>             <C>                        <C>         <C>      <C>        <C>         <C>       <C>         <C>      <C>
Net Asset Value ($000s)                    $14,718     $13,234  $  25,117  $22,699     $21,847   $19,639     $25,195  $22,406
Basic Shares Outstanding (000s)              3,744       3,744     3,744     3,744       3,744     3,744       3,744    3,744
Diluted Shares Outstanding (000s)           3,796        3,796     3,796     3,796       3,796     3,796       3,796    3,796
                                            ------
Basic NAV per Share                        $  3.93     $  3.53  $  6.71    $ 6.06      $  5.83   $  5.24     $  6.73$    5.98
Diluted NAV per Share                      $  3.88     $  3.49  $  6.62    $ 5.98      $  5.75   $  5.17     $  6.64     5.90
</TABLE>
<TABLE>
<CAPTION>

                                                                                          Key
                                                     Case I               Case II             Case III             Case IV
                                               -----------------    ----------------     -----------------     -------------------
                                              (PV-10)     (PV-15)   (PV-10)   (PV-15)    (PV-10)    (PV-15)    (PV-10)      (PV-15)
                                              -------     -------   -------   -------
<S>             <C>                        <C>         <C>        <C>       <C>        <C>        <C>       <C>          <C>
Net Asset Value ($000s)                    $ 142,625   $ 116,427  $183,801  $153,976   $153,753   $128,477  $ 181,535    $ 150,129
Basic Shares Outstanding (000s)               12,274      12,274    12,274    12,274     12,274     12,274     12,274       12,274
Diluted Shares Outstanding (000s)            12,764       12,764    12,764    12,764     12,764     12,764     12,764       12,764
                                            --------
Basic NAV per Share                        $  11.62    $    9.49  $  14.97  $  12.54   $  12.53   $  10.47  $   14.79    $   12.23
Diluted NAV per Share                      $  11.17    $    9.12  $  14.40  $  12.06   $  12.05   $  10.07  $   14.22    $   11.76

Implied Exchange Ratio (KP:EGY) - Basic       0.338x      0.373x    0.448x    0.483x     0.466x     0.501x     0.455x       0.489x
Implied Exchange Ratio (KP:EGY) - Diluted     0.347x      0.382x    0.459x    0.496x     0.478x     0.514x     0.467x       0.502x
</TABLE>




Note: PV-10 is the standardized measure of discounted (at 10% per year) future
net pretax cash flows. PV-15 is the standardized measure of discounted (at 15%
per year) future net pretax cash flows.

         The NAV analysis resulted in an 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 involving publicly traded target companies. These
transactions were primarily selected within the oil and gas exploration and
production industry, occurring after 1995, with a total transaction value of
less than $250 million. Premiums (or discounts) paid were



                                       38

<PAGE>

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>



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

         AA Corporate Finance determined that the premium (discount) to be paid
in the merger is within the range of the low and high of the 14 selected
transactions for all time periods analyzed. AA Corporate Finance determined that
the fact that it is generally in the lower half of the range appears reasonable
based on the following:

         o     the downward revisions to proved reserves reflected in Columbus'
               June 30, 2000 Reserve Report (independently prepared by Reed W.
               Ferrill and Associates, Inc.);

         o     lack of market liquidity in Columbus' common stock; and

         o     the market's expectation of the proposed sale resulting from the
               announcement made by Columbus regarding its intent to explore
               strategic alternatives maximizing shareholder value, including
               consideration of possibly selling the company or finding a merger
               partner and updates regarding this process prior to announcement
               of the merger on August 28, 2000.



                                       39

<PAGE>

As such, AA Corporate Finance determined that the premiums paid analysis for the
90 days and 1-year time periods is more relevant.

         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.

         Although the Stock Price Ratio History Analysis is commonly used as a
method of evaluating transaction fairness, it relies upon the public market's
perception of the equity value of Columbus and Key over the time period
analyzed. The public market's perception of value does not always accurately
reflect information about those assets, liabilities and operations. Stock price
levels can also be affected by numerous factors, including but not limited to
level of trading volume, level of market float, press releases and other
shareholder communication, and expectations of future earnings and cash flow
levels. As such, AA Corporate Finance did not rely solely upon the results of
this analysis.

         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.
These companies were primarily selected for comparability based on geographic
location, oil/gas composition of proved reserves, and size. 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.


                                       40

<PAGE>

         The comparable company trading analysis implied an exchange ratio of
0.285x to 1.163x.


         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.


         Pursuant to the terms of AA Corporate Finance's engagement, AA
Corporate Finance received a fee of $250,000 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



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 will receive a value-added fee for its
services in the range of $280,000 to $320,000 upon successful completion of the
merger, in addition to a retainer of $25,000 paid upon its engagement.


                              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.

          o    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.

         o     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.



                                       41

<PAGE>
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


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


                                       42

<PAGE>
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


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


         The obligations of Key and Columbus to complete the merger are subject
to a number of conditions, including the following, unless waived:

          o    approval by Columbus' shareholders;

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

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

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

         o     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




         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:




                                       43

<PAGE>
          o    organization, standing and authority;

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

          o    capital structure;

          o    significant subsidiaries;

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

          o    compliance with agreements, court orders and laws;

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

          o    the absence of material litigation;

          o    the absence of certain changes or events;

          o    tax matters;

          o    employee benefits and labor matters;

          o    the absence of violations or liabilities under environmental
               laws;

          o    good title to properties;

          o    futures or options trading;

          o    insurance matters;

          o    material contracts;

          o    fees of financial advisors and others;  and

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



Certain 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:



                                       44

<PAGE>

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

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

          o    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:


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

          o    adopt any amendments to its charter or bylaws;

          o    increase the compensation or benefits of any director or
               executive officer;

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

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

          o    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;

          o    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;

          o    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;

         o     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

          o    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:


          o    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;

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

          o    convening and holding the Columbus shareholders meeting;



                                       45

<PAGE>

          o   access to information;

          o   public announcements;

          o   mutual notification of specified matters;

          o   indemnification of Columbus' officers and directors;

          o   agreements as to certain employee benefits matters; and

          o   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



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 43.


Termination

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


          o    by mutual written consent of Key and Columbus;

          o    by either Key or Columbus if:

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

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



                                       46

<PAGE>



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

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

                   o    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;

          o    by Columbus if:

                  o    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;

          o    by Key if:

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

                  o    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

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


Termination fees and expenses


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

         o     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;

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

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

         o     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

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


                                       47

<PAGE>
         o        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:


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

         o    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.


         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.

         Merger costs. Columbus expects to incur approximately $2,000,000 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 43.


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.



                                       48

<PAGE>
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.


             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 and principal shareholders 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 52. 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 52.





                                       49

<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>


                                                                                            Number of                Exercise 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 Executive             32,000                        7.00
                                           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>


                                       50
<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 November 30,
2000 under this policy:


Harry A. Trueblood                 $182,532
Clarence H. Brown                  $126,034
Michael M. Logan                   $127,340
Ronald H. Beck                     $127,340
James P. Garrett                   $ 67,003




With respect to Messrs. Trueblood and Brown, the amounts in the table above have
been approved by the board as retirement pay 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 summarizes the opinion of counsel to Columbus
concerning the material United States federal income tax consequences of the
merger to a United States 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. The opinion is filed
as an exhibit to the registration statement of which this prospectus is a part.


         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



U.S.; and shareholders who hold Columbus stock as part of a hedge, straddle or
conversion transaction. 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.


                                       51

<PAGE>

         Tax Consequences of the Merger.

Sherman & Howard L.L.C. has delivered its opinion 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."

                               As a reorganization under Section 368(a),

          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.


         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.


         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



                                       52

<PAGE>

proposed changes in the tax laws or other tax consequences of the merger to
them.


         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.

                        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.
Provisions that could materially affect the rights of shareholders are discussed
below.


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. Colorado law permits a
corporation to declare and pay dividends unless, after giving it effect:

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

       o  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

The concepts of par value, capital and surplus are retained under Delaware law.
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.


                                       53

<PAGE>
Appraisal/Dissenters' Rights

Colorado

Colorado law permits a shareholder of a corporation participating in certain
major corporate transactions to, under varying circumstances, assert
appraisal/dissenters' rights by which the 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. Colorado
law provides that dissenters' rights are generally available for mergers,
statutory share exchanges and sales, leases, exchanges or other dispositions of
all or substantially all of the property of a corporation or of an entity
controlled by the corporation if the shareholders of the corporation were
entitled to vote on the consent of the corporation to the disposition under
state law.

Delaware

Delaware law provides that dissenters' rights are generally available only for
mergers.


Advance Notice of Meeting

Colorado

Colorado law requires that shareholders be provided prior written notice no more
than 60 days nor less than ten days before the date of a meeting of
shareholders; provided that if the number of authorized shares is to be
increased, at least 30 days' notice must be given.

Delaware

Delaware law requires that stockholders be provided prior written notice no more
than 60 days nor less than ten days before the date of the meeting of
stockholders.


Shareholder Consent in Lieu of Meeting

Colorado

Under Colorado law, unless otherwise provided in the articles of incorporation,
any action required to be taken or which may be taken at an annual or special
meeting of shareholders may be taken without a meeting if a consent in writing
is signed by the holders of all of the outstanding stock entitled to vote.
Columbus' articles of incorporation do not prohibit such action.

Delaware

Under Delaware law, unless otherwise provided in the certificate of
incorporation, any action required to be taken or which may be taken at an
annual or special meeting of stockholders may be taken without a meeting if a
consent in writing is signed by the holders of outstanding stock having not less
than the minimum number of votes that would be necessary to authorize such
action at a meeting at which all shares entitled to vote were present and voted.
Key's certificate of incorporation permits stockholder action by written
consent.




                                                  54

<PAGE>
Shareholder Derivative Suits

Colorado

Derivative actions may be brought in Colorado by a shareholder on behalf of, and
for the benefit of, a Colorado corporation. Colorado law provides that a
shareholder must be a shareholder of the corporation at the time of the
transaction of which the shareholder complains. If the shareholder bringing the
derivative action holds less than 5% of the outstanding shares of any class of
the corporation, unless such shares have a market value in excess of $25,000,
the corporation is entitled to require the shareholder to post a bond for the
costs and reasonable expenses, excluding attorneys' fees, which may be directly
attributable to and incurred by the corporation in defense of the derivative
action or may be incurred by other parties named as defendant in such action for
which the corporation may become legally liable. A shareholder may not sue
derivatively unless the shareholder first makes demand on the board of directors
to bring the suit and such demand has been refused, unless the shareholder can
demonstrate that such demand would have been futile.

Delaware

Derivative actions may also be brought in Delaware by a stockholder on behalf
of, and for the benefit of, a Delaware corporation. Delaware law provides that a
stockholder must state in the complaint that he or she was a stockholder of the
corporation at the time of the transaction of which he or she complains. A
stockholder may not sue derivatively unless he or she first makes demand on the
corporation that it bring suit and such demand has been refused, unless the
stockholder can demonstrate that such demand would have been futile.


Stockholder Approval of Certain Business Combinations under Delaware Law


Delaware law prohibits, in certain circumstances, a "business combination"
between the corporation and an "interested stockholder" within three years of
the stockholder becoming an " interested stockholder." An " interested
stockholder" is a holder who, directly or indirectly, controls 15% or more of
the outstanding voting stock or is an affiliate of the corporation and was the
owner of 15% or more of the outstanding voting stock at any time within the
prior three year period. A


"business combination" includes a merger or consolidation involving the
corporation and the interested stockholder, a sale or other disposition of
assets having an aggregate market value equal to 10% or more of the consolidated
assets of the corporation or the aggregate market value of the outstanding stock
of the corporation involving the corporation and the interested stockholder,
certain transactions that would increase the interested stockholder's
proportionate share ownership in the corporation and the receipt by the
interested stockholder of the benefit of any loans, advances, guarantees,
pledges or other financial benefits provided by or through the corporation.



This provision does not apply where (a) either the business combination or the
transaction which resulted in the stockholder becoming an interested stockholder
is approved by the corporation's board of directors prior to the date the
interested stockholder acquired such 15% interest, (b) upon the consummation of
the transaction which resulted in the stockholder becoming an interested
stockholder,



the interested stockholder owned at least 85% of the outstanding voting stock of
the corporation excluding for the purposes of determining the number of shares
outstanding shares held by persons who are directors and also officers and by



                                       55

<PAGE>

employee stock plans in which participants do not have the right to determine
confidentially whether shares held subject to the plan will be tendered, (c) the
business combination is approved by a majority of the board of directors and the
affirmative vote of two-thirds of the outstanding votes entitled to be cast by
disinterested stockholders at an annual or special meeting, (d) the corporation
does not have a class of voting stock that is listed on a national securities
exchange, authorized for quotation on an inter-dealer quotation system of a
registered national securities association, or held of record by more than 2,000
stockholders unless any of the foregoing results from action taken, directly or
indirectly, by an interested stockholder or from a transaction in which a person
becomes an interested stockholder, (e) the stockholder acquires a 15% interest
inadvertently and divests itself of such ownership and would not have been a 15%
stockholder in the preceding three years but for the inadvertent acquisition of
ownership, (f) the stockholder acquired the 15% interest when these restrictions
did not apply, or (g) the corporation has opted out of this provision. Key has
not opted out of this provision.

         Colorado law does not contain an equivalent business combination
provision.


                                  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 have been passed upon for
Columbus by Sherman & Howard L.L.C. See "Material United States Federal Income
Tax Considerations" on page 47.



                                     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


                                       56

<PAGE>
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 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.



                       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
Columbus for its meeting. 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.


                                       57

<PAGE>


<TABLE>
<CAPTION>


                      Key Sec Filings
                    (File No. 000-11769)                                                     Period
--------------------------------------------------------------   ---------------------------------------------------------------
<S>                                                                <C>
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
Form 425....................................................       Filed November 2, 2000
Current Report on Form 8-K..................................       Filed November 3, 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 February 29, 2000
Quarterly Report on Form 10-Q...............................       Quarter ended May 31, 2000
Quarterly Report on Form 10-Q...............................       Quarter ended August 31, 2000
Proxy Statement on Schedule 14A.............................       For Annual Meeting May 4, 2000
</TABLE>





         Columbus' Annual Report on Form 10-K for the year ended November 30,
1999 is attached to this proxy statement/prospectus as Annex C and its Quarterly
Report on Form 10-Q for the quarter ended August 31, 2000 is attached as Annex
D.

         Key is also incorporating by reference additional documents that it
files with the SEC between the date of this proxy statement/prospectus and the
date of the Columbus shareholder meeting.

         Key has supplied all information contained or incorporated by reference
in this proxy statement/prospectus relating to Key, and Columbus has supplied
all 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 November
__, 2000.



                                       58

<PAGE>
                         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.



                         Commonly Used Oil and Gas Terms


         "Bbl" means barrel.

         "Bcf" means billion cubic feet.

         "BOE" means barrels of oil equivalent.

         "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 natural
gas liquids to equivalent Mcf. The U.S. convention for this conversion is
one-sixth Bbl equals one Mcfe.

         "MMcf" means million cubic feet.


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



                                       59

<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


                          AGREEMENT AND PLAN OF MERGER

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:

                                    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


<PAGE>



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

  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




                                       A-2

<PAGE>



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.

  (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



                                       A-3

<PAGE>



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.

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



                                       A-4

<PAGE>






                                   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 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



                                       A-5

<PAGE>



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 (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



                                       A-6

<PAGE>



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 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.




                                       A-7

<PAGE>



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



                                       A-8

<PAGE>



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 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



                                       A-9

<PAGE>



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 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



                                      A-10

<PAGE>



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.

    (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.

    (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



                                      A-11

<PAGE>



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.

    (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).



                                      A-12

<PAGE>





  (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,
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



                                      A-13

<PAGE>



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.

  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



                                      A-14

<PAGE>



any of Columbus or its subsidiaries' properties are in compliance with 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 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:



                                      A-15

<PAGE>




    (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;

        (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



                                      A-16

<PAGE>



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 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



                                      A-17

<PAGE>



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 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 rights created by statute, the charter
or bylaws of Key, or any agreement to which



                                      A-18

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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.

  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.



                                      A-19

<PAGE>





  (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.

  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



                                      A-20

<PAGE>



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, 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,



                                      A-21

<PAGE>



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 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.

    (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



                                      A-22

<PAGE>



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 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.



                                      A-23

<PAGE>





    (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, 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.



                                      A-24

<PAGE>




    (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 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:

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



                                      A-25

<PAGE>




    (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
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



                                      A-26

<PAGE>



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
(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



                                      A-27

<PAGE>



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 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.




                                      A-28

<PAGE>



    (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 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 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



                                      A-29

<PAGE>



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);

  (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



                                      A-30

<PAGE>



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 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



                                      A-31

<PAGE>



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 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.



                                      A-32

<PAGE>




  (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.

                                   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 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



                                      A-33

<PAGE>



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 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



                                      A-34

<PAGE>



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 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



                                      A-35

<PAGE>



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 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).

  SECTION 6.08. Merger Sub. Prior to the Effective Time, Merger Sub shall not
conduct any business or make any



                                      A-36

<PAGE>



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 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.



                                      A-37

<PAGE>




    (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 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



                                      A-38

<PAGE>



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.

    (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);




                                      A-39

<PAGE>



    (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 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 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



                                      A-40

<PAGE>



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 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



                                      A-41

<PAGE>



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, 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


                                      A-42

<PAGE>





    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) "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);



                                      A-43

<PAGE>





    (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 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-44

<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-45
<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
general and administrative savings and a change in accounting method
(depreciation);

8) compared certain operational and financial contributions of the Company and
Acquiror to a combined entity;




                                                    B-1

<PAGE>



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.

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,

/s/ ARTHUR ANDERSEN GLOBAL ENERGY CORPORATE FINANCE GROUP





                                       B-2

<PAGE>


















                              COLUMBUS ENERGY CORP.







<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 MATTER LISTED BELOW.


         Approve the merger agreement among Key Production Company, Inc., a
         wholly owned subsidiary of Key and Columbus Energy Corp. and the merger
         of the subsidiary into Columbus pursuant to which each share of
         Columbus common stock will be converted into 0.355 shares of Key common
         stock.



                                              FOR        AGAINST       ABSTAIN
                                              / /          / /            / /


This proxy also grants authority for the proxies to vote in their discretion
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>
                                     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 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).


                                      II-1

<PAGE>
 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 (contained in the first
                    filing of this Registration Statement)

8.1                 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)

 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 the first filing 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

                                      II-2

<PAGE>
         (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.

         (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;

                                      II-3

<PAGE>
         (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 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-4

<PAGE>




                                   SIGNATURES

         Pursuant to the requirements of the Securities Act of 1933, as amended,
the Registrant has duly caused this Amendment No. 1 to Registration Statement to
be signed on its behalf by the undersigned, thereunto duly authorized, in the
City of Denver, State of Colorado, on the 13th day of November, 2000.

                  Key Production Company, Inc.

                  By: /s/ F.H. Merelli
                  --------------------------------------------
                  F.H. MERELLI
                  Chairman and Chief Executive Officer

         Pursuant to the requirements of the Securities Act of 1933, this
Amendment No. 1 to Registration Statement has been signed by the following
persons in the capacities indicated on the 13th day of November, 2000.

NAME AND SIGNATURE                          TITLE

         /s/ F.H. Merelli                   Chairman and Chief
---------------------------                 Executive Officer (Principal
         F.H. Merelli                       Executive Officer)

                  *                         Vice President and Chief Financial
---------------------------                 Officer(Principal Financial and
         Paul Korus                         Accounting Officer)



                  *                         Director
---------------------------
      Cortlandt S. Dietler

                  *                         Director
----------------------------
          L. Paul Teague


      * /s/ F.H. Merelli
--------------------------------------
F.H. Merelli, Attorney in Fact

                                      II-5




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