PENNACO ENERGY INC
SB-2/A, 1999-08-04
CRUDE PETROLEUM & NATURAL GAS
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<PAGE>

     AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON AUGUST 3, 1999


                                                      REGISTRATION NO. 333-68317

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

                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                           --------------------------

                                AMENDMENT NO. 3
                                       TO
                                   FORM SB-2
                          REGISTRATION STATEMENT UNDER
                           THE SECURITIES ACT OF 1933
                           --------------------------

                              PENNACO ENERGY, INC.
       (Exact Name of Small Business Issuer As Specified In Its Charter)

<TABLE>
<S>                                 <C>                            <C>
             NEVADA                             1311                      88-0384598
 (State or other jurisdiction of    (Primary Standard Industrial       (I.R.S. Employer
 incorporation or organization)     Classification Code Number)     Identification Number)
</TABLE>

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

                          1050 17TH STREET, SUITE 700
                             DENVER, COLORADO 80265
                                 (303) 629-6700
    (Address, including zip code, and telephone number, including area code,
                 of Registration's principal executive offices)

              PAUL M. RADY, PRESIDENT AND CHIEF EXECUTIVE OFFICER
                              PENNACO ENERGY, INC.
                          1050 17TH STREET, SUITE 700
                             DENVER, COLORADO 80265
                                 (303) 629-6700
 (Name, address, including zip code, and telephone number, including area code,
                             of agent for service)

                                    COPY TO:
                                DAVID P. OELMAN
                             ANDREWS & KURTH L.L.P.
                             600 TRAVIS, SUITE 4200
                              HOUSTON, TEXAS 77002
                           --------------------------

      APPROXIMATE DATE OF COMMENCEMENT OF THE PROPOSED SALE TO THE PUBLIC:
As soon as practicable after the effective date of this Registration Statement.

    If any of the securities being registered on this Form are to be offered on
a delayed or continuous basis pursuant to Rule 415 under the Securities Act,
other than securities offered only in connection with dividend or interest
reinvestment plans, check the following box.  /X/

    If this Form is filed to register additional securities for an offering
pursuant to Rule 462(b) under the Securities Act, check the following box and
list the Securities Act registration statement number of earlier effective
registration statement for the same offering.  / /

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

    If delivery of the prospectus is expected to be made pursuant to Rule 434,
please check the following box.  / /

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 SAID SECTION 8(A),
MAY DETERMINE.

- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
<PAGE>

                  SUBJECT TO COMPLETION, DATED AUGUST 3, 1999.


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 IS NOT SOLICITING AN OFFER TO BUY THESE SECURITIES
IN ANY STATE WHERE THE OFFER OR SALE IS NOT PERMITTED.
<PAGE>
PROSPECTUS

                              PENNACO ENERGY, INC.

                                3,296,165 SHARES
                                  COMMON STOCK

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

THE COMPANY:

- -  We are an independent natural gas and oil exploration and production company.

- -  Our address is:
 Pennaco Energy, Inc.
 1050 17th Street
 Suite 700
 Denver, Colorado 80265
 (303) 629-6700

THE SECURITIES AND THE OFFERING:

- -  3,296,165 shares of common stock.

- -  All of the common stock offered for resale through this prospectus is being
   sold by some of our stockholders. We will receive no proceeds from this
   offering.

- -  Our common stock is listed on the American Stock Exchange under the symbol
   "PN." The last reported sales price of the common stock on July 30, 1999 was
   $11.5625.

     THIS INVESTMENT INVOLVES RISK. SEE "RISK FACTORS" BEGINNING ON PAGE 6.

Neither the SEC nor any state securities commission has determined whether this
prospectus is truthful or complete. Nor have they made, nor will they make, any
determination as to whether anyone should buy these securities. Any
representation to the contrary is a criminal offense.
<PAGE>
                               TABLE OF CONTENTS

<TABLE>
<CAPTION>
                                                                        PAGE
                                                                        ----
<S>                                                                     <C>
Prospectus Summary....................................................     3
Risk Factors..........................................................     7
Use of Proceeds.......................................................    11
Price Range of Common Stock...........................................    11
Dividend Policy.......................................................    11
Plan of Operation.....................................................    12
Business..............................................................    14
Description of Property...............................................    21
Management............................................................    26
Certain Relationships and Related Transactions........................    32
Principal and Selling Stockholders....................................    33
Description of Securities.............................................    34
Plan of Distribution..................................................    35
Experts...............................................................    36
Legal Matters.........................................................    37
Changes In and Disagreements with Accountants.........................    37
Where to Find More Information........................................    37
Financial Statements..................................................   F-1
</TABLE>

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

    As used in this prospectus, (a) any reference to the "Company," "Pennaco,"
"we," "our" or "ours" means Pennaco Energy, Inc. and (b) the "Stock" means the
common stock of the Company, par value $.001, being resold through this
prospectus.

                            ------------------------
<PAGE>
                               PROSPECTUS SUMMARY

    THIS SUMMARY HIGHLIGHTS INFORMATION CONTAINED ELSEWHERE IN THIS PROSPECTUS.
IT IS NOT COMPLETE AND MAY NOT CONTAIN ALL OF THE INFORMATION THAT YOU SHOULD
CONSIDER BEFORE INVESTING IN THE COMMON STOCK OFFERED FOR RESALE THROUGH THIS
PROSPECTUS. YOU SHOULD READ THE ENTIRE PROSPECTUS CAREFULLY, INCLUDING THE "RISK
FACTORS" SECTION AND THE FINANCIAL STATEMENTS AND THE NOTES TO THOSE STATEMENTS.

PENNACO ENERGY, INC.

    Pennaco Energy, Inc. is an independent, development stage exploration and
production company. Our current operations are completely focused on the
acquisition, development and production of natural gas from coal bed methane
properties in the Rocky Mountain region of the United States. We are one of the
largest holders of oil and gas leases covering coal bed methane properties in
the Powder River Basin of northeastern Wyoming and southeastern Montana. As of
March 1, 1999, we owned oil and gas lease rights with respect to approximately
311,800 net acres in the Powder River Basin in northeastern Wyoming and
southeastern Montana.

    We initiated our drilling program on November 15, 1998 and had drilled 280
gross (246 net) wells by July 29, 1999. Gross wells represent the total number
of wells in which we have an interest. Net wells represent the aggregate net
working interest that we own in all of our wells. We have drilled 242 wells in
our South Gillette Area with an average 93% working interest and 38 wells in the
Pennaco/ CMS area of mutual interest with an average 50% working interest. We
operate all of the 242 wells drilled in the South Gillette Area and 19 of the
wells drilled in the Pennaco/CMS area of mutual interest. We plan to spend $18
million in 1999 to drill approximately 460 net coal bed methane wells. There can
be no assurance that we will have sufficient funds to drill all of these wells,
that it will be economic to do so or that these wells will ultimately be
productive. The wells we have drilled to date have each taken an average of
three days to drill and are either producing or in various stages of completion
awaiting construction of gathering and compression systems and connection to a
pipeline.

    We flow tested most of the 32 wells which were drilled as of December 31,
1998. These tests resulted in the calculation of proved non-producing reserves
as reviewed by our third party reserve engineers. At December 31, 1998, we had
estimated net proved reserves of 18.1 Bcfe, or billion cubic feet equivalent,
with present value of estimated future net revenues before income taxes
(utilizing a 10% discount rate) of $8.5 million and a standardized measure of
discounted future net cash flows of $6.1 million. Natural gas constituted 100%
of our estimated net proved reserves, all of which were located in the Powder
River Basin and 30% of which were developed but non-producing at year-end. We
operate all of the wells on our proved developed properties.

    We commenced initial gas production in April of 1999. Our net working
interest gas production is approximately 11 MMcf, or million cubic feet, per day
from 94 producing wells. While we believe that we have assembled an attractive
acreage position, we cannot guarantee that our acreage contains significant
amounts of natural gas reserves nor that our reserves can or will be
economically developed.

CMS TRANSACTION

    On October 23, 1998, we signed a definitive purchase and sale agreement with
CMS Energy Corporation's exploration and production unit, CMS Oil and Gas
Company, whereby CMS Oil and Gas Company acquired an undivided 50% working
interest in approximately 492,000 net acres of our leasehold position in the
Powder River Basin for $28 million in cash. The first closing occurred on
November 20, 1998 and the second closing occurred on January 15, 1999. We
acquired the leasehold position which was conveyed to CMS in the CMS transaction
for approximately $7.0 million. Since the announcement of our agreement with CMS
in October 1998, the jointly owned leasehold contained in the area of mutual
interest has increased from 492,000 net acres to approximately 560,000 net acres
through additional acreage purchases.

                                       3
<PAGE>
    The CMS agreement provides for the development of our lease acreage within
the area of mutual interest with Pennaco and CMS each operating approximately
50% of the wells to be drilled. As is customary in oil and gas leasehold
transactions, the agreement provides for the adjustment of the purchase price
for title defects discovered prior to closing and for the opportunity for one
party to participate in acquisitions made by the other party in the area of
mutual interest defined in the agreement. As of July 6, 1999, $0.3 million of
the proceeds remained in escrow in the event certain title defects could not be
cured. Under the terms of the agreement, we will also receive from CMS
approximately $0.5 million for CMS's share of approximately 68,000 net acres
acquired by Pennaco in the area of mutual interest since the announcement of the
transaction. The agreement also provides for a preferential purchase right to
the other party in the event either CMS or Pennaco attempts to sell all or a
portion of its interest in the acreage covered by the agreement. There is no
preferential purchase right in the event that either party enters into a merger,
reorganization or consolidation. All of the leases in the area of mutual
interest are dedicated to CMS Gas Transmission and Storage, an affiliate of CMS
Oil and Gas, for gathering, compression and transportation.

GAS GATHERING, COMPRESSION, MARKETING AND TRANSPORTATION

    We plan to continue to focus our capital spending on drilling, well
completion, production and land acquisition activities rather than gas gathering
and compression operations. Accordingly, we will utilize third party gathering
services to gather, compress and transport our natural gas from the wellhead to
market in return for gathering and compression fees. We recently entered into an
agreement with Bear Paw Energy under which Bear Paw Energy will construct, own
and operate gas gathering systems as well as provide gas gathering and
compression services to Pennaco outside of the CMS area of mutual interest in
our South Gillette Area.

    Production growth in the Powder River Basin is currently impeded by a
natural gas pipeline bottleneck which restricts the movement of natural gas out
of the basin. Four pipeline construction and expansion projects which will serve
the Powder River Basin have been announced and are underway. On December 23,
1998, CMS Gas Transmission and Storage, Enron Capital and Trade Resources
Corporation, Western Gas and Colorado Interstate Gas Company, a subsidiary of
The Coastal Corporation, jointly announced the formation of Fort Union Gas
Gathering, LLC. Fort Union is building a 106 mile, 24 inch gathering pipeline to
gather coal bed methane gas in the Powder River Basin for delivery to interstate
pipeline interconnects near Glenrock, Wyoming. The new gathering line is
expected to have an initial capacity of approximately 450 MMcf per day of
natural gas and can be expanded with additional compression to 700 MMcf per day.
Construction is nearing completion and operations are scheduled to commence on
or about September 1, 1999.

    In September 1998, KN Energy, Inc. and Devon Energy Corporation announced
the formation of Thunder Creek Gas Services LLC. Thunder Creek has announced its
intention to build a 126 mile, 24 inch gathering line capable of delivering up
to 450 MMcf per day of natural gas to multiple interstate pipelines near
Douglas, Wyoming. Construction is nearing completion and operations are
scheduled to commence in September 1999.

    Additionally, Wyoming Interstate Gas Company, a subsidiary of the Coastal
Corporation, has filed an application with the Federal Energy Regulatory
Commission to construct a new 143 mile, 24 inch natural gas pipeline known as
the Medicine Bow Lateral from Glenrock to Cheyenne, Wyoming where the line will
interconnect with several interstate pipelines which serve the mid-continent and
west coast regions of the U.S. as well as the central Colorado markets. The
Medicine Bow Lateral is scheduled to commence operations in January 2000,
subject to FERC approval, will have initial capacity of 260 MMcf per day and can
be expanded with additional compression to 390 MMcf per day.

                                       4
<PAGE>
    On March 30, 1999, Pennaco and CMS announced that Pennaco has entered into a
gas gathering agreement with CMS Continental Natural Gas, Inc., a wholly owned
subsidiary of CMS Energy Corporation. Under this agreement, CMS Continental will
provide gas gathering services to Pennaco and CMS Oil and Gas Company within the
Pennaco/CMS area of mutual interest, which excludes our South Gillette Area. CMS
also announced plans to construct a $190 million, 110 mile high pressure
gathering pipeline through the Pennaco/CMS jointly owned acreage in the northern
Powder River Basin coal bed methane play, connecting at its southern terminus
with the Fort Union pipeline project. The Northern Header Gathering System is
designed to gather 256 MMcf of natural gas per day and can be expanded to 500
MMcf per day with additional compression. Construction is underway and
operations are scheduled to commence in November 1999.

    Under the terms of the 15 year agreement, CMS Continental will charge
Pennaco a fixed fee per Mcf to gather, compress and transport our gas production
from each central metering facility located adjacent to each group or pod of 15
to 20 producing wells to the Fort Union gas gathering system. The fee varies by
well location within the area of mutual interest. CMS Continental's gathering
system is required to meet various performance measures subject to penalties for
under-performance. If CMS Continental elects not to connect a particular well or
group of wells, we have the right to connect the well or wells at our own cost
and adjust the fixed fee accordingly or allow a third party to do so.

    There can be no assurance that any of these gathering and pipeline systems
will ultimately be constructed or that they will be completed in the time-frame
currently anticipated.

RECENT DEVELOPMENTS

    PROVED RESERVES


    On July 29, 1999, we announced that our estimated net proved reserves as of
June 30, 1999 were 42.7 Bcf, or billion cubic feet, of natural gas, a 24.6 Bcf
increase from the 18.1 Bcf of estimated net proved reserves reported as of
December 31, 1998. All of the net proved reserves are located in the South
Gillette Area. Approximately 52%, or 22.3 Bcf, of the proved reserves were
classified as proved developed producing based upon 94 gross producing wells and
17%, or 7.2 Bcf, were proved developed shut-in, representing 32 gross wells
which were drilled and completed but awaiting pipeline connection. The remaining
31%, or 13.2 Bcf, were classified as proved undeveloped. The present value of
estimated future net revenues from the 42.7 Bcf of proved reserves, before
income taxes, totaled $28.3 million, using a 10% discount rate and a June 30,
1999 natural gas price of $2.00 per thousand cubic feet, as reported in the CIG
Rocky Mountain index, held constant. The reserve evaluation was performed by
Ryder Scott Company.


    1999 REVISED CAPITAL SPENDING PLAN

    On June 16, 1999, we announced a revised capital spending budget of $26.5
million for 1999, all of which will be directed toward our Powder River Basin
coal bed methane project. The revised budget represents an $8.1 million, or 44%,
increase over our former budget of $18.4 million. We plan to spend approximately
$18.0 million to drill approximately 460 net wells in the project area during
1999. These wells will be a combination of joint Pennaco/CMS wells drilled in
the area of mutual interest and Pennaco wells drilled outside the area of mutual
interest. Approximately $8.5 million is allocated to additional lease
acquisition. We will need additional funding to supplement the cash on our
balance sheet and internal cash flow in order to execute the announced capital
spending plans for 1999.

    BANK CREDIT FACILITY

    On July 23, 1999, we announced that Pennaco and U.S. Bank National
Association closed a $25 million revolving credit facility. The revolver is a
borrowing base facility secured by our coal bed methane properties and will have
an initial borrowing capacity of $10 million. We will utilize the bank

                                       5
<PAGE>
facility to supplement cash on our balance sheet and internal cash flow in order
to fund our revised 1999 capital spending plan.

    We currently maintain our principal executive offices at 1050 17th Street,
Suite 700, Denver, Colorado 80265. Our telephone number is (303) 629-6700 and
the facsimile number is (303) 629-6800. We also maintain an office at 3651
Lindell Road, Suite A, Las Vegas, Nevada 89103 and a field office at 400 South
Miller Avenue, Gillette, Wyoming 82716.

                                       6
<PAGE>
                                  RISK FACTORS

    AN INVESTMENT IN OUR COMPANY INVOLVES A SIGNIFICANT DEGREE OF RISK. YOU
SHOULD GIVE CAREFUL CONSIDERATION TO THE SPECIFIC FACTORS SET FORTH BELOW, AS
WELL AS THE OTHER INFORMATION SET FORTH IN THIS PROSPECTUS, BEFORE YOU PURCHASE
THE COMMON STOCK OFFERED IN THIS PROSPECTUS.

WE ARE A NEW COMPANY AND HAVE NO OPERATING HISTORY UPON WHICH TO BASE AN
  ASSUMPTION THAT WE WILL ACHIEVE OUR BUSINESS GOALS.

    We are a development stage company and had no revenues or income until
recently and we are subject to all the risks inherent in the creation of a new
business. Since our principal activities to date have been limited to
organizational activities, prospect development, acquisition of leasehold
interests, commencement of a drilling program and construction of gathering and
compression facilities, we have no record of any revenue-producing operations.
Consequently, there is no operating history upon which to base an assumption
that we will be able to successfully implement our business plans.

WE DEPEND ON GATHERING, COMPRESSION AND TRANSPORTATION FACILITIES TO MARKET OUR
  PRODUCTION AND WE CANNOT GUARANTEE THAT THESE FACILITIES WILL BE AVAILABLE
  WHEN NEEDED.

    The marketability of our natural gas production will depend in part upon the
availability, proximity and capacity of gas gathering and compression systems,
pipelines and eventually, processing facilities. Pipeline demand in the area is
increasing as coal bed methane development activity continues to expand. Our
core land position is located in an area near the development activity and
production. We have entered into an agreement with CMS Continental Natural Gas,
Inc. whereby CMS Continental will gather, compress and transport our gas within
the Pennaco/CMS area of mutual interest. We have entered into an agreement with
Bear Paw Energy whereby Bear Paw will construct well connection facilities as
well as gather, compress and transport our gas in the South Gillette Area which
lies outside of the Pennaco/CMS area of mutual interest. See "Prospectus
Summary--Gas Gathering, Compression, Marketing and Transportation". There is
limited pipeline capacity to transport gas out of the Powder River Basin which
will require expansion and new construction to accommodate the increasing
production. The expansion of the pipeline capacity is likely to require
significant capital outlays by the pipeline companies and the related plans and
specifications are subject to government regulatory review, permits and
approvals. This approval process may result in delays in the commencement and
completion of any pipeline construction project. We cannot guarantee that
certain of our wells will not be shut in for significant periods of time due to
the lack of capacity in existing pipelines. Further, we cannot guarantee that
any additional pipeline capacity will be completed on a timely basis or that we
will be permitted to transport any volumes via the additional capacity.

WE FACE RISKS RELATED TO THE LEASES WE ENTER INTO THAT MAY RESULT IN ADDITIONAL
  COSTS.

    It is customary in the oil and gas industry to acquire a lease interest in a
property based upon a preliminary title investigation. If the title to the
leases we plan to acquire are defective, we could lose the money already spent
on acquisition and development, or incur substantial costs to repair the title
defect. Our oil and gas leases give us the right to develop and produce oil and
gas from the leased properties. It is possible that the terms of our oil and gas
leases may be interpreted differently depending on the state in which the
property is located. For instance, royalty calculations can be substantially
different from state to state, depending on each state's interpretation of lease
language concerning the costs of production. We believe we have followed
industry standards in interpreting our oil and gas leases in the states where we
operate. However, we cannot guarantee that there will be no litigation
concerning the proper interpretation of the terms of our leases. Adverse
decisions in such litigation could result in material costs or the loss of one
or more leases.

THE VOLATILITY OF OIL AND GAS MARKETS MAY AFFECT OUR BUSINESS.

    If we begin production, our revenues, profitability and future rate of
growth will be substantially dependent upon prevailing market prices for natural
gas and oil, which can be extremely volatile and in

                                       7
<PAGE>
recent years have been depressed at times by excess domestic and imported
supplies. In addition to market factors, actions of state and local agencies,
the United States and foreign governments, and international cartels affect oil
and gas prices. All of these factors are beyond our control. These external
factors and the volatile nature of the energy markets make it difficult to
estimate future prices of natural gas and oil. We cannot guarantee that we will
be able to produce oil or gas on an economic basis in light of prevailing market
prices. If we are able to produce natural gas, any substantial or extended
decline in the price of natural gas would have a material adverse effect on our
financial condition and results of operations, including reduced cash flow and
borrowing capacity and could reduce both the value and the amount of our oil and
gas reserves.

WE FACE COMPETITION FROM OTHER COMPANIES IN THE NATURAL GAS BUSINESS AND FOR THE
  ACQUISITION OF SUITABLE PROPERTIES.

    Competition to acquire properties is intense. We compete with a number of
potential purchasers that possess greater financial resources than are available
to us. Different companies evaluate potential acquisitions differently. This
results in widely differing bids. If other bidders are willing to pay higher
prices than we believe are supported by our evaluation criteria, then our
ability to acquire prospects could be limited. Low or uncertain prices for
properties could cause potential sellers to withhold or withdraw properties from
the market. In such an environment, we cannot guarantee that there will be a
sufficient number of suitable prospects available for acquisition. Also, we may
be limited in our options for developing prospects.

    In addition to competition for leasehold acreage in the Powder River Basin,
the oil and gas exploration and production industry is intensely competitive as
a whole. We will compete against established companies that have significantly
greater financial, marketing, personnel, and other resources than us. Such
competition could have a material adverse effect on our ability to execute our
business plan and our profitability.

SHUT-IN WELLS, CURTAILED PRODUCTION, AND OTHER PRODUCTION INTERRUPTIONS MAY
  AFFECT OUR ABILITY TO DO BUSINESS.

    In the event that we initiate production and generate income from our coal
bed methane properties, such production may be curtailed or shut in for
considerable periods of time due to any one or a combination of the following
factors:

    - a lack of market demand;

    - government regulation;

    - pipeline and processing interruptions;

    - production allocations;

    - diminished pipeline capacity; and

    - force majeure.

    These curtailments may continue for a considerable period of time. There may
be an excess supply of gas in areas where our operations will be conducted. In
such an event, it is possible that there will be no market or a very limited
market if we do generate production in the future. There is also the possibility
that drilling rigs may not be available when needed and there may be shortages
of crews, equipment and other manpower requirements.

WE ARE SUBJECT TO OPERATING RISKS WHICH MAY NOT BE COVERED BY OUR INSURANCE.

    The oil and natural gas business involves certain operating hazards, such
as:

    - well blowouts;

    - craterings;

    - explosions;

                                       8
<PAGE>
    - uncontrollable flows of oil;

    - natural gas or well fluids;

    - fires;

    - formations with abnormal pressures;

    - pipeline ruptures or spills;

    - pollution;

    - releases of toxic gas; and

    - other environmental hazards and risks.

    Any of these hazards could cause us to suffer substantial losses if they
occur after we begin commercial production. In addition, we may be liable for
environmental damage caused by previous owners of the property we have purchased
or leased. As a result, substantial liabilities to third parties or governmental
entities may be incurred, the payment of which could reduce or eliminate the
funds available for exploration, development or acquisitions or cause us to
suffer losses. In accordance with customary industry practices, we maintain
insurance against some, but not all, of such risks and losses. We currently
carry well control insurance as well as property and general liability
insurance. We may elect to self-insure if our management believes that the cost
of insurance, although available, is excessive relative to the risks presented.
The occurrence of an event that is not covered, or not fully covered, by
insurance could have a material adverse effect on our financial condition and
results of operations. In addition, pollution and environmental risks generally
are not fully insurable.

OUR DRILLING ACTIVITIES MAY PRODUCE UNDRINKABLE WATER THAT MUST BE TREATED OR
  REINJECTED WHICH WILL INCREASE OUR COSTS.

    If during the course of drilling activity undrinkable water is discovered,
it may be necessary to install and operate evaporators or to drill disposal
wells to reinject the produced water back into the underground rock formations
adjacent to the coal seams or to lower sandstone horizons. In the event we are
unable to obtain the appropriate permits, undrinkable water is discovered or if
applicable laws or regulations require water to be disposed of in an alternative
manner, the costs to dispose of produced water will increase and these costs
could have a material adverse effect on our operations in this area and the
profitability of such operations including rendering future production and
development uneconomic.

OUR INDUSTRY IS SUBJECT TO EXTENSIVE REGULATION WHICH MAY INCREASE OUR COSTS.

    The oil and gas industry is extensively regulated by federal, state and
local authorities. Legislation and regulations affecting the industry are under
constant review for amendment or expansion, raising the possibility of changes
that may affect, among other things, the pricing or marketing of oil and gas
production. Substantial penalties may be assessed for noncompliance with various
applicable statutes and regulations, and the overall regulatory burden on the
industry increases our cost of doing business and, in turn, decreases our
profitability.

WE DO NOT ANTICIPATE PAYING DIVIDENDS IN THE FORESEEABLE FUTURE.

    At the present time, we do not anticipate paying dividends, cash or
otherwise, on our common stock in the foreseeable future. Future dividends will
depend on the presence or absence of earnings, our financial requirements and
other factors. If you anticipate the need for immediate income from your
investment, you should refrain from purchasing the securities offered by this
prospectus.

                                       9
<PAGE>
           ACTUAL RESULTS MAY DIFFER FROM FORWARD-LOOKING STATEMENTS.

    Some of the statements contained in this prospectus under "Prospectus
Summary," "Risk Factors," "Plan of Operation" and "Business" that relate to our
business and the industry we operate in, are forward-looking. Statements or
assumptions related to or underlying such forward-looking statements include,
without limitation, statements regarding:

    - the quality of our properties with regard to, among other things, the
      existence of reserves in economic quantities;

    - our ability to increase our reserves through exploration and development;

    - anticipated domestic demand for natural gas and oil; and

    - the adequacy of our sources of capital resources and liquidity.

Actual results may differ materially from those suggested by the forward-looking
statements for various reasons, including those discussed under "Risk Factors."

                                       10
<PAGE>
                                USE OF PROCEEDS

    We will not receive any of the proceeds from sales of the stock offered
hereby.

                          PRICE RANGE OF COMMON STOCK

    Since April 19, 1999, our common stock has been traded on the American Stock
Exchange. From July 1, 1998 to April 16, 1999, our common stock was traded over
the counter and quoted on the OTC Bulletin Board system. The following table
sets forth the high and low closing prices for the common stock as reported on
the OTC Bulletin Board system for the period from July 1, 1998 through April 16,
1999 and on the American Stock Exchange for the period from April 19, 1999
through July 30, 1999.

<TABLE>
<CAPTION>
                                                                               HIGH        LOW
                                                                             ---------  ---------
<S>                                                                          <C>        <C>
1998
  Third quarter............................................................  $    6.16  $    3.03
  Fourth quarter...........................................................  $    5.38  $    2.50

1999
  First quarter............................................................  $    5.25  $    2.97
  Second quarter...........................................................  $   12.62  $    5.19
  Third quarter (through July 30, 1999)....................................  $   11.75  $   10.31
</TABLE>

    As of May 3, 1999, there were approximately 5,700 stockholders of record of
our common stock.

                                DIVIDEND POLICY

    We intend to retain all of our earnings, if any, to finance the expansion of
our business and for general corporate purposes, including future acquisitions
of properties. We do not anticipate paying cash dividends on the common stock in
the foreseeable future.

                                       11
<PAGE>
                               PLAN OF OPERATION

    The following information should be read in conjunction with the financial
statements and notes to the financial statements presented elsewhere in this
prospectus. We follow the successful efforts method of accounting for oil and
gas properties. See "Organization and Summary of Accounting Policies," included
in Note 1 of the consolidated financial statements.

GENERAL

    As a development stage company, we had no revenues from operations in 1998
or in the three months ended March 31, 1999. During the period from our
inception on January 26, 1998 through March 31, 1999, we reported net income of
$3,199,687. We realized a gain on sale of properties of $13,358,764 based on the
$26,824,767 of proceeds received in the first and second closing of the CMS
transaction which occurred on November 20, 1998 and January 15, 1999,
respectively. Expenses incurred from our inception through March 31, 1999
totaled $7,673,766, including general and administrative expenses of $5,022,379
and exploration expenses of $1,877,357, including geologic consulting fees,
geologic data and lease rentals. During the three month period ended March 31,
1999, we reported net income of $7,012,560. We realized a gain on the sale of
properties of $11,945,557 received in the second closing of the CMS transaction.
Expenses incurred during the three month period ended March 31, 1999 totaled
$1,126,400 including general and administrative expenses of $1,044,787 and
exploration expenses of $51,590, including geologic consulting fees, geologic
data and lease rentals.

    In the accompanying financial statements, in accordance with APB No. 25
"Accounting for Stock Issued to Employees," we have recognized a non-cash charge
to earnings for compensation expense of approximately $1,790,000 for the period
from our inception through December 31, 1998 for stock, warrants, and options
issued to certain officers and employees. Compensation expense was calculated
based on the difference between the closing price per share on the last trading
day prior to the date of employment with Pennaco and the $1.75 unit price for
shares and warrants purchased by one of our officers hired at the beginning of
July and the option price for options awarded to officers and key employees
hired in July and August 1998. The restricted securities were offered as an
incentive to attract a senior management team. We believe that the offers made
by the Board of Directors were at fair market value due to the restricted nature
of the securities to be issued and the lack of a liquid trading market for the
our common stock at the time of the offer. However, APB No. 25 requires the
measurement of compensation expense at the date of employment rather than at the
offer date. Further, APB No. 25 requires that compensation be measured based on
the quoted market price of the stock once a company's stock is publicly traded.
While we were not an SEC registrant until September 8, 1998, our shares have
been quoted on the OTC Bulletin Board System since July 1, 1998.

LIQUIDITY AND CAPITAL RESOURCES

    Our capital resources are limited. Until April 1999, we had not produced any
revenues and our main source of funds has been the sale of our equity securities
and proceeds from CMS Transaction. We had approximately $10.4 million in cash as
of March 31, 1999.

    On December 23, 1998, we announced an agreement with CMS Oil and Gas
Company. Under the terms of this agreement, CMS paid us $5.6 million in the form
of a bridge loan secured by substantially all of our oil and gas leases.
Approximately $3.2 million of this amount was paid directly to our existing
creditors. We used the balance for general corporate purposes. We received $7.6
million at the first closing on November 20, 1998 and $14.8 million at the
second closing on January 15, 1999 less approximately $1.8 million which was
deposited into an escrow account subject to customary closing adjustments. The
CMS bridge loan was canceled at the second closing. Pro forma for the CMS
transaction as of December 31, 1998, we had no debt and approximately $19.8
million of cash. As of July 6, 1999, approximately $0.3 million remained in
escrow pending closing adjustments for the CMS transaction. The proceeds of the
CMS transaction allowed us to repay our current liabilities and allowed us to
fund a substantial portion of

                                       12
<PAGE>
our planned $26.5 million capital expenditure program for 1999. We will require
further funding to meet our future expenditure plans.

    Should our cash flow from operations be insufficient to satisfy our planned
capital expenditure requirements, we cannot guarantee that additional debt or
equity financing will be available to meet these requirements. We recently
closed a $25 million bank credit facility with U.S. Bank. The bank credit
facility is secured by substantially all of our coal bed methane properties and
has an initial borrowing base of $10 million. We cannot guarantee that the bank
facility will provide us with sufficient borrowing capacity to execute our
future capital spending plans.

    The level of debt we assume will have several important effects on our
future operations, including (1) a substantial portion of our cash flow could be
dedicated to the payment of interest on its indebtedness and would not be
available for other purposes and (2) our ability to obtain additional financing
in the future may be impaired. To address the operational and administrative
requirements of our ongoing development activities, we anticipate that during
the next 12 months employee requirements will increase to approximately 20
employees. Currently, we have 16 full-time employees.

CAPITAL EXPENDITURES

    We had capital expenditures of approximately $6.7 million in the first
quarter of 1999, including approximately $2.7 million for lease acquisitions and
$3.9 million for drilling activities. On June 16, 1999, we announced a revised
capital spending budget of $26.5 million for 1999, all of which will be directed
towards our Powder River Basin coal bed methane project. The revised budget
represents an $8.1 million, or 44%, increase over our former budget of $18.4
million. We plan to spend approximately $18.0 million to drill approximately 460
net wells in the Powder River Basin during 1999, although we cannot guarantee
that we will have sufficient funds to drill all of these wells, that it would be
economic to do so or that these wells will ultimately be productive. The wells
will be a combination of joint Pennaco/CMS wells drilled in the area of mutual
interest and Pennaco wells drilled primarily on a 100% working interest basis
located outside of the Pennaco/CMS area of mutual interest. The balance of the
1999 capital budget, approximately $8.5 million, is allocated to lease
acquisition. We recently closed a bank credit facility secured by our coal bed
methane properties which will be utilized in addition to our cash reserves and
internal cash flow to execute the revised 1999 capital spending budget.

                                       13
<PAGE>
                                    BUSINESS

GENERAL

    We are an independent, development stage exploration and production company.
Our current operations are completely focused on the acquisition, development
and production of natural gas from coal bed methane properties in the Rocky
Mountain region of the United States. We are one of the largest holders of oil
and gas leases covering coal bed methane properties in the Powder River Basin in
northeastern Wyoming and southeastern Montana. As of March 1, 1999, we owned oil
and gas lease rights with respect to approximately 311,800 net acres in the
Powder River Basin.

    The coal bed methane wells in the Powder River Basin are generally 350 to
1,200 feet in depth and typically take only two or three days to drill and
complete. Because of the relatively shallow depth and short amount of time to
drill a well, coal bed methane wells have relatively low drilling, completion
and well connection costs. These costs typically amount to $60,000 to $70,000
per well. Approximately 50% of the total well costs are well connection costs,
comprised of costs of gathering lines, power lines and surface equipment. In
order to conserve our capital, we plan to contract much of the well connection
cost to third party gatherers in return for payment of a per Mcf, or thousand
cubic feet, gathering fee. The coal bed methane gas recovered from the wells in
the Powder River Basin does not require processing but does require dehydration
and compression and could eventually require carbon dioxide treatment over the
next several years.

    We initiated our drilling program on November 15, 1998 and had drilled
approximately 32 gross (30 net) wells as of December 31, 1998. As of July 29,
1999, we had drilled approximately 280 gross (246 net) coal bed methane wells.
We have drilled 242 wells in our South Gillette Area with an average 93% working
interest and 38 wells in the Pennaco/CMS area of mutual interest with an average
50% working interest. We operate all of the 242 wells drilled in the South
Gillette Area and 19 of the wells drilled in the Pennaco/CMS area of mutual
interest. We plan to spend $18 million in 1999 to drill approximately 460 net
coal bed methane wells. We cannot guarantee that we will have sufficient funds
to drill all of these wells, that it will be economic to do so or that these
wells will ultimately be productive. The wells we have drilled to date have each
taken an average of three days to drill and are in various stages of completion
and testing while awaiting construction of gathering and compression systems and
connection to a pipeline.

    We flow tested most of the 32 wells drilled as of December 31, 1998. These
tests resulted in the calculation of proved non-producing reserves as reviewed
by our third party engineers. At December 31, 1998, we had estimated net proved
reserves of 18.1 Bcfe with present value of estimated future net revenues before
income taxes (utilizing a 10% discount rate) of $8.5 million and a standardized
measure of discounted future net cash flows of $6.1 million. Natural gas
constituted 100% of our estimated net proved reserves, all of which were located
in the Powder River Basin and 30% of which were developed but non-producing at
year-end. We operate all of the wells on our proved developed properties.

    The success of our drilling program, including the magnitude of any
potential reserves, cannot be fully evaluated until the wells are completed,
connected to a gathering system and produced for a period of time. We commenced
initial gas production in April 1999. Our net working interest gas production is
approximately 11 MMcf per day from 94 producing wells. We operate all of our
producing wells.

    We entered into an agreement with Bear Paw Energy, Inc., a subsidiary of
TransMontaigne, Inc., under which Bear Paw Energy will construct, own and
operate gas gathering systems as well as provide gas gathering and compression
services to Pennaco in our South Gillette Area. Under the terms of the agreement
with Bear Paw Energy, Bear Paw paid Pennaco approximately $1.0 million for
gathering and compression construction and equipment costs that we had incurred
to date and Bear Paw paid Pennaco a negotiated fixed fee per Mcf for gas
gathered, compressed and transported from the south Gillette Area. On March 17,
1999, we entered into an agreement with Western Gas Resources, Inc. to compress
and transport 11 MMcf per day of gas from the Dopplebock compressor station
located southwest of our South Gillette Area to the interconnect with Williston
Basin Interstate Pipeline at Recluse, Wyoming. Pennaco has entered into two gas
sale contracts to sell a total of 10,000 MMBtu, or million British thermal
units,

                                       14
<PAGE>
(approximately 11 MMcf per day of production) per day of natural gas for 12
months beginning April 1, 1999 to two gas purchasers deliverable at Recluse,
Wyoming into the Williston pipeline. The purchasers under these agreements,
Interenergy Resources Corporation and Montana-Dakota Utilities Co., will pay
Pennaco a negotiated fixed rate per MMbtu for the natural gas delivered under
these agreements. We entered into agreements to purchase gas for the months of
April and May 1999 in order to supplement our initial gas production and meet
our gas sales contract obligations. We believe that once gathering and
compressions systems are completed, our initial production from our South
Gillette Area will be sufficient to satisfy our obligations under these two gas
sales contracts.

    We currently maintain our principal executive offices at 1050 17th Street,
Suite 700, Denver, Colorado 80265. Our telephone number is (303) 629-6700 and
our facsimile number is (303) 629-6800. We also maintain an office at 3651
Lindell Road, Suite A, Las Vegas, Nevada 89103 and a field office at 400 South
Miller Avenue, Gillette, Wyoming 82716.

CMS TRANSACTION

    On October 23, 1998, we signed a definitive purchase and sale agreement with
CMS Oil and Gas Company relating to the development of our Powder River Basin
acreage within a designated area of mutual interest. Pursuant to the terms of
the CMS agreement, CMS acquired an undivided 50% working interest in
approximately 492,000 net acres of our leasehold position in the Powder River
Basin for $28.0 million. We acquired that portion of the leasehold position
which was conveyed to CMS in the CMS transaction for approximately $7.0 million.
The purchase price provided for in the CMS agreement was the result of arm's
length negotiations between Pennaco and CMS and was also a function of the
consideration we originally paid for the acreage. Our Board of Directors
received a fairness opinion from Hanifen Imhoff, Inc. that the CMS transaction
was fair to our stockholders from a financial point of view. We compensated
Hanifen Imhoff, Inc. with a fee of $125,000 for rendering this fairness opinion.

    Since the announcement of the CMS transaction, the jointly owned leasehold
contained in the area of mutual interest has grown from 492,000 net acres to
approximately 560,000 net acres through additional acreage purchases. The CMS
agreement provides for the development of our leasehold acreage within the area
of mutual interest, with Pennaco and CMS each operating approximately 50% of the
wells to be drilled. As is customary in oil and gas leasehold transactions, the
agreement provides for the adjustment of the purchase price for title defects
discovered prior to closing and for the opportunity for one party to participate
in acquisitions made by the other party in the area of mutual interest defined
in the agreement. As of June 25, 1999, approximately $0.3 million of the
proceeds of the CMS transaction remained in escrow pending resolution of
possible title defects. Under the terms of the agreement, we will also receive
approximately $0.5 million from CMS for their share of approximately 68,000 net
acres acquired by Pennaco in the area of mutual interest since the announcement
of the transaction. The agreement provides for a preferential purchase right to
the other party in the event either CMS or Pennaco attempts to sell a portion of
its interest in the acreage covered by the agreement. There is no preferential
purchase right in the event that either party enters into a merger,
reorganization or consolidation. All of the leases in the area of mutual
interest are dedicated to CMS Gas Transmission and Storage, an affiliate of CMS,
for gathering, compression and transportation, provided that such services are
offered at competitive market rates.

BUSINESS STRATEGY

    Our business strategy is to build an exploration and production company that
is focused on creating value for our stockholders through profitable growth in
reserves, production and cash flow per share. The key components of our business
strategy include the following.

    - Focus activities in the Powder River Basin coal bed methane project.

    - Allocate approximately 70% of drilling expenditures to lower risk
      development near existing coal bed methane production.

                                       15
<PAGE>
    - Drive acreage consolidation in the Powder River Basin.

    - Outsource gas gathering, compression and transportation operations.

    - Continue to build high quality management and technical teams.

    - Acquire additional undeveloped properties in the Powder River Basin that
      add to near-term drilling inventory.

    - Seek to acquire operating control and majority ownership interests in
      properties to optimize the timing and efficiency of operations.

    - Maintain a strong balance sheet and diversify capital sources in order to
      be in a position to capitalize on opportunities as they occur.

GAS GATHERING, COMPRESSION, MARKETING AND TRANSPORTATION

    Production growth in the Powder River Basin is currently impeded by a
natural gas pipeline bottleneck which restricts the movement of natural gas out
of the basin. Currently only two pipelines are available to transport coal bed
methane gas out of the Powder River Basin. The MIGC pipeline, which is operated
by Western Gas, has recently undergone a 40 MMcf per day expansion to 130 MMcf
per day. The MIGC line runs south through the eastern side of the Powder River
Basin to interconnect with two interstate pipelines near Glenrock, Wyoming, but
has little available capacity due to increasing coal bed methane gas production
from the Powder River Basin. A subsidiary of MDU Resources operates the 42 MMcf
per day Williston Basin Interstate pipeline which runs northeast from Recluse,
Wyoming to local markets throughout eastern Montana and North Dakota and
interconnects with the Northern Border pipeline, an interstate pipeline which
travels southeast to the Chicago markets. The Williston Basin Interstate
pipeline has limited additional capacity.

    Four pipeline construction and expansion projects which will serve the
Powder River Basin have been announced and are underway. On December 23, 1998,
CMS Gas Transmission and Storage, Enron Capital and Trade Resources Corporation,
Western Gas and Colorado Interstate Gas Company, a subsidiary of The Coastal
Corporation, jointly announced the formation of Fort Union Gas Gathering, LLC.
Fort Union is building a 106 mile, 24 inch gathering pipeline to gather coal bed
methane gas in the Powder River Basin. The new gathering line is expected to
have an initial capacity of approximately 450 MMcf per day of natural gas and
can be expanded with additional compression to 700 MMcf per day. The Fort Union
line is expected to deliver coal bed methane gas to a carbon dioxide treating
facility to be constructed near Glenrock, Wyoming and to interstate pipeline
interconnects near Glenrock. Construction is nearing completion and operations
are scheduled to commence on or about September 1, 1999, although we cannot
guarantee that the system will ultimately be constructed or that it will be
completed in the time-- frame currently anticipated.

    In September 1998, KN Energy, Inc. and Devon Energy Corporation announced
the formation of Thunder Creek Gas Services LLC. Thunder Creek has announced its
intention to build a 126 mile, 24 inch gathering line capable of delivering up
to 450 MMcf per day of natural gas to multiple interstate pipelines near
Douglas, Wyoming. Construction is nearing completion and operations are
scheduled to commence in September 1999, although we cannot guarantee that the
system will ultimately be construed or that it will be completed in the
time-frame currently anticipated.

    Wyoming Interstate Gas Company, a subsidiary of the Coastal Corporation, has
filed an application with the Federal Energy Regulatory Commission to construct
a new 143 mile, 24 inch natural gas pipeline known as the Medicine Bow Lateral
from Glenrock to Cheyenne, Wyoming where the line will interconnect with several
interstate pipelines which serve the mid-continent and west coast regions of the
U.S. as well as the central Colorado markets. The Medicine Bow Lateral is
scheduled to commence operations in January 2000, subject to Federal Energy
Regulatory Commission approval, will have initial capacity of 260 MMcf per day
of natural gas and can be expanded with additional compression to 390 MMcf per
day.

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<PAGE>
We cannot guarantee that the system will ultimately be constructed or that it
will be completed in the time-frame currently anticipated.

    On March 30, 1999, Pennaco and CMS announced that Pennaco has entered into a
gas gathering agreement with CMS Continental Natural Gas, Inc., a wholly owned
subsidiary of CMS Energy Corporation. Under this agreement, CMS Continental will
provide gas gathering services to Pennaco and CMS Oil and Gas Company within the
Pennaco/CMS area of mutual interest, which excludes our South Gillette Area. CMS
also announced plans to construct a $190 million, 110 mile high pressure
gathering pipeline through the Pennaco/CMS jointly owned acreage in the northern
Powder River Basin coal bed methane play, connecting at its southern terminus
with the Fort Union pipeline project. The Northern Header Gathering System is
designed to gather 256 MMcf of natural gas per day and can be expanded to 500
MMcf per day with additional compression. Construction is underway and
operations are scheduled to commence in November 1999.

    Under the terms of a 15 year agreement, CMS Continental will charge Pennaco
a negotiated fixed fee per Mcf to gather, compress and transport our gas
production from each central metering facility located adjacent to each group or
pod of 15 to 20 producing wells, to the Fort Union gas gathering system. The fee
varies by well location within the area of mutual interest. CMS Continental's
gathering system is required to meet various performance measures subject to
penalties for under-performance. If CMS Continental elects not to connect a
particular well or group of wells, we have the right to connect the well or
wells at our own cost and adjust the fixed fee accordingly or allow a third
party to do so.

    We have focused our initial capital spending on drilling, well completion,
production and land acquisition activities rather than gas gathering and
compression operations. Accordingly, we are utilizing third party gathering
services to gather, compress and transport our natural gas from the wellhead to
market in return for gathering and compression fees. We have entered into an
agreement with Bear Paw Energy under which Bear Paw Energy will construct, own
and operate gas gathering systems as well as provide gas gathering and
compression services to Pennaco outside of the Pennaco/CMS area of mutual
interest in our South Gillette Area. Under the terms of the agreement, Bear Paw
Energy will charge Pennaco a fixed per Mcf fee to gather, compress and transport
our gas production from the wellhead to various delivery points. The fee varies
by delivery point and amount of compression. Bear Paw Energy's gathering system
is required to meet various performance measures subject to penalty for
underperformance. If Bear Paw elects not to connect a particular well or group
of wells, we have the right to construct the gathering system ourselves or allow
a third party to do so.

    On March 16, 1999 we entered into a ten year gathering and compression
agreement with Western Gas Resources. Under the terms of the agreement, Western
Gas will compress and transport 11 MMcf per day of gas from the Doppelbock
compressor station located southwest of our South Gillette Area to the
interconnect with the Williston Basin Interstate pipeline at Recluse, Wyoming
for a negotiated fixed fee per Mcf. Western Gas will take delivery of a portion
of the gas gathered by Bear Paw Energy in the South Gillette Area and transport
the gas to Doppelbock.

    On November 11, 1998, we entered into a gas brokerage and administration
agreement with Mercator Energy, Inc. whereby Mercator agreed to provide gas
marketing and gas administration services to Pennaco. This agreement was renewed
on March 1, 1999 and extends until September 1, 1999 and converts to a
month-to-month basis thereafter. Mercator has extensive experience in gas
marketing services in the Rocky Mountain region and specifically in the Powder
River and surrounding gas producing basins.

COMPETITION

    We compete with a number of other potential purchasers of oil and gas leases
and producing properties, many of which have greater financial resources than we
do. The bidding for oil and gas leases has become particularly intense in the
Powder River Basin with bidders evaluating potential acquisitions with varying
product pricing parameters and other criteria that result in widely divergent
bid prices. The presence of bidders willing to pay prices higher than are
supported by our evaluation criteria could further

                                       17
<PAGE>
limit our ability to acquire oil and gas leases. In addition, low or uncertain
prices for properties can cause potential sellers to withhold or withdraw
properties from the market. In this environment, we cannot guarantee that there
will be a sufficient number of suitable oil and gas leases available for
acquisition or that we can sell oil and gas leases or obtain financing for or
participants to join in the development of prospects.

    In addition to competition for leasehold acreage in the Powder River Basin,
the oil and gas exploration and production industry is intensely competitive as
a whole. We compete against well-established companies that have significantly
greater financial, marketing, personnel and other resources than us. This
competition could have a material adverse effect on our ability to execute our
business plan and our profitability.

REGULATION

    GENERAL

    Our operations are affected by numerous governmental laws and regulations
including energy, environmental, conservation, tax and other laws and
regulations relating to the energy industry. Many departments and agencies, both
federal and state, are authorized by statute to issue and have issued rules and
regulations binding on the oil and natural gas industry and its individual
participants. Changes in any of these laws and regulations could have a material
adverse effect on our business. In view of the many uncertainties with respect
to current and future laws and regulations, including their applicability to
Pennaco, we cannot predict the overall effect of such laws and regulations on
its future operations.

    We believe that our operations comply in all material respects with all
applicable laws and regulations and that the existence and enforcement of such
laws and regulations have no more restrictive effect on our method of operations
than on other similar companies in the energy industry.

    OPERATIONS ON FEDERAL OR STATE LEASES

    Our operations on federal or state oil and gas leases will be subject to a
number of restrictions, including nondiscrimination statutes. These operations
are subject to a variety of on-site security regulations and other permits and
authorizations issued by the Bureau of Land Management, Minerals Management
Service and other agencies. In order to drill wells in Wyoming on federal, state
or privately-owned land, we are required to file an Application for Permit to
Drill with the Wyoming Oil and Gas Commission. Drilling on acreage controlled by
the federal government requires the filing of a similar application with the
BLM. While we have been able to obtain required drilling permits to date, we
cannot guarantee that permitting requirements will not adversely effect our
ability to complete our drilling program at the cost and in the time period
currently anticipated.

    Drilling on federal lands in a large portion of the Powder River Basin is
currently limited until the completion of an environmental impact statement, or
EIS, by the BLM. The number of drilling permits allowed on federal lands subject
to the EIS are limited until the EIS is complete. This limitation could
adversely affect our ability to drill on federal lands. Approximately 53% of our
leasehold is comprised of federal acreage although only a portion of our acreage
is currently included in the EIS. Operators are currently drilling wells on an
interim basis on federal lands with the limited number of drilling permits
allowed by the BLM until the EIS is complete. We have approximately 38 interim
drilling permits on federal lands within the EIS. The EIS was originally
scheduled for completion in May 1999, but has been delayed until September 1999.
We cannot guarantee the ultimate completion date of the EIS.

    TRANSPORTATION AND SALE OF NATURAL GAS

    The FERC regulates interstate natural gas pipeline transportation rates as
well as the terms and conditions of service. FERC's regulations will affect the
marketing of any natural gas produced by us, as well as any revenues we receive
for sales of natural gas. In 1985, the FERC adopted policies that make natural
gas transportation accessible to natural gas buyers and sellers on an
open-access, nondiscriminatory

                                       18
<PAGE>
basis. The FERC issued Order No. 636 on April 8, 1992, which, among other
things, prohibits interstate pipelines from making sales of gas tied to the
provision of other services and requires pipelines to "unbundle" the services
they provide. This has enabled buyers to obtain natural gas supplies from any
source and secure independent delivery service from the pipelines. All of the
interstate pipelines subject to FERC's jurisdiction are now operating under
Order No. 636, open access tariffs. On July 29, 1998, the FERC issued a Notice
of Proposed Rulemaking regarding the regulation of short term natural gas
transportation services. FERC proposes to revise its regulations to require all
available short term capacity (including capacity released by shippers holding
firm entitlements) to be allocated through an auction process. FERC also
proposes to require pipelines to offer additional services under open access
principles, such as "park and loan" services. In a related initiative, FERC
issued a Notice of Inquiry on July 29, 1998 seeking input from natural gas
industry players and affected entities regarding virtually every aspect of the
regulation of interstate natural gas transportation services. Among other
things, FERC is seeking input on whether to retain cost-based rate regulation
for long term transportation services, potential changes in the manner in which
rates are designed, and the use of index driven or incentive rates for
pipelines. The July 29, 1998 Notice of Inquiry may lead to a subsequent Notice
of Proposed Rulemaking to further revise FERC's regulations.

    Additional proposals and proceedings that might affect the natural gas
industry are considered from time to time by Congress, the FERC, state
regulatory bodies and the courts. We cannot predict when or if any such
proposals might become effective or their effect, if any, on our operations. The
natural gas industry historically has been closely regulated. Accordingly, we
cannot guarantee that the less stringent regulatory approach recently pursued by
the FERC and Congress will continue indefinitely into the future.

    PRODUCTION

    The production of oil and natural gas is subject to regulation under a wide
range of state and federal statutes, rules, orders and regulations. State and
federal statutes and regulations require permits for drilling operations,
drilling bonds and reports concerning operations. Wyoming and Montana have
regulations governing conservation matters, including provisions for the
unitization or pooling of oil and natural gas properties, the establishment of
maximum rates of production from oil and natural gas wells and the regulation of
the spacing, plugging and abandonment of wells. The effect of these regulations
is to limit the amount of oil and natural gas that we can produce from our wells
and to limit the number of wells or the locations at which we can drill.
Additionally, each state generally imposes a production or severance tax with
respect to production and sale of crude oil, natural gas and gas liquids within
its jurisdiction.

    ENVIRONMENTAL REGULATIONS

    Various federal, state and local laws and regulations governing the
discharge of materials into the environment, or otherwise relating to the
protection of the environment, will affect our operations and costs. In
particular, our exploration, development and production operations, its
activities in connection with storage and transportation of liquid hydrocarbons
and its use of facilities for treating, processing or otherwise handling
hydrocarbons and wastes therefrom will be subject to stringent environmental
regulation. Because coal bed methane wells typically produce significant amounts
of water, we are required to file applications with state and federal
authorities, as applicable, to enable us to dispose of water produced from its
wells. While we have been able to obtain required water disposal permits to
date, we cannot guarantee that permitting requirements will not negatively
affect our ability to complete our drilling and development program at the cost
and in the time period currently anticipated.

    As with the energy industry generally, compliance with existing regulations
will increase our overall cost of doing business. These costs include production
expenses primarily related to the control and limitation of air emissions and
the disposal of produced water, capital costs to drill exploration and
development wells resulting from expenses primarily related to the management
and disposal of drilling fluids and other oil and gas exploration wastes and
capital costs to construct, maintain and upgrade production equipment and
facilities.

                                       19
<PAGE>
    The Comprehensive Environmental Response, Compensation and Liability Act,
which is commonly referred to as CERCLA and is also known as "Superfund",
imposes liability, without regard to fault or the legality of the original act,
on classes of persons that contributed to the release of a "hazardous substance"
into the environment. These persons include the "owner" or "operator" of the
site and companies that disposed or arranged for the disposal of the hazardous
substances found at the site. CERCLA also authorizes the Environmental
Protection Agency and, in some instances, third parties, to act in response to
threats to the public health or the environment and to seek to recover from the
responsible classes of persons the costs they incur. In the course of its
ordinary operations, we may generate waste that may fall within CERCLA's
definition of a "hazardous substance." We may be jointly and severally liable
under CERCLA for all or part of the costs required to clean up sites at which
such wastes have been disposed.

    We may own or lease properties that have been used for the exploration and
production of hydrocarbons in the past. Many of these properties will have been
owned by third parties whose actions with respect to the treatment and disposal
or release of hydrocarbons or other wastes were not under our control. These
properties and wastes disposed thereon may be subject to CERCLA and analogous
state laws. Under these laws, we could be required to remove or remediate
previously disposed wastes, including wastes disposed of or released by prior
owners or operators, to clean up contaminated property, including contaminated
groundwater; or to perform remedial plugging operations to prevent future
contamination.

EMPLOYEES

    We currently have 16 full-time employees and utilize the services of
approximately 10 consulting geologists, engineers, and land acquisition
professionals. We plan to hire additional employees as needed. We have an
outsourcing arrangement with Trinity Petroleum Management, LLC which provides
for administrative services, specifically land administration and accounting.
The Trinity agreement is effective until August 31, 1999 when it converts to a
month-to-month arrangement. We believe that by outsourcing various
administrative functions to Trinity we are able to hire fewer full-time
employees and more efficiently control our administrative expenses.

CUSTOMERS

    During 1998, we made no sales of natural gas. We have entered into two
natural gas sales contracts with a term of one year each beginning April 1,
1999. One contract for 5,000 MMBtu per day is with Interenergy Resources
Corporation, an affiliate of KN Energy, Inc. and the other, also for 5,000 MMBtu
per day, is with Montana-Dakota Utilities Co., a division of MDU Resources
Group, Inc. We are dependent on these two customers to purchase our initial
production, particularly until the completion of the Fort Union gathering
project which is scheduled to commence operations on September 1, 1999 and the
Thunder Creek gathering project which is scheduled to commence operations in
October 1999.

PREDECESSOR ENTITIES

    We were formed under the laws of the State of Nevada on January 26, 1998, to
engage in the business of oil and gas exploration, production and marketing. Our
original predecessor was incorporated on March 12, 1985 as VCI Video
Communications, Inc. in the Province of British Columbia and subsequently
changed its name to AKA Video Communications, Inc. On March 25, 1996 the
shareholders of AKA Video agreed to exchange all AKA Video shares for shares of
International Metal Protection, Inc., our immediate predecessor. After this
exchange AKA Video became inactive and the directors and shareholders approved
the windup of AKA Video. International Metal was incorporated on March 5, 1996,
in the State of Wyoming. Following an exchange of all the International Metal
outstanding shares in a share for share exchange with Pennaco, International
Metal was dissolved in February of 1998. We are the sole surviving entity of the
reorganization.

LEGAL PROCEEDINGS

    We may be subject from time to time to routine litigation in connection with
our oil and gas operations. Currently the Company is not involved in litigation
which could have a material impact on the Company.

                                       20
<PAGE>
                            DESCRIPTION OF PROPERTY

OPERATIONS

    We initiated our drilling program on November 15, 1998 and had drilled
approximately 32 gross (30 net) wells as of December 31, 1998. As of July 29,
1999, we had drilled approximately 280 gross (246 net) coal bed methane wells.
We have drilled 242 wells in our South Gillette Area with an average 93% working
interest and 38 wells in the Pennaco/CMS area of mutual interest with an average
50% working interest. We operate all of the 242 wells drilled in the South
Gillette Area and 19 of the wells drilled in the Pennaco/CMS area of mutual
interest. We plan to spend $18 million in 1999 to drill approximately 460 net
coal bed methane wells. We cannot guarantee that we will have sufficient funds
to drill all of these wells, that it will be economic to drill all of these
wells or that these wells will ultimately be productive. All of the wells
drilled to date have been operated by Pennaco. The wells we have drilled to date
have each taken an average of three days to drill and are in various stages of
completion and testing while awaiting construction of gathering and compression
systems and connection to a pipeline. The success of our drilling program,
including the magnitude of any potential reserves, cannot be determined until
the wells are completed, connected to a gathering system and produced for a
period of time.

    Our ability to complete our drilling program is entirely dependent upon the
availability of sufficient capital, equipment and personnel. The estimated total
cost per well is approximately $60,000 to $70,000 to drill, complete and install
well connection facilities. The estimated drilling portion of the total per well
cost is approximately $10,000 per well.

    We have entered into a drilling agreement with CBM Drilling, LLC, pursuant
to which we had prepaid drilling costs of $333,473 as of December 31, 1998.
Based on the agreement that every third well shall be drilled at no cost to
Pennaco, the prepaid drilling costs will be recovered after approximately 100
additional net wells are drilled for Pennaco by CBM Drilling. The prepayments to
CBM Drilling were made to ensure that drilling rigs appropriate for coal bed
methane drilling operations will be available and dedicated to the Company's
planned drilling program. CBM Drilling currently has four coal bed methane
drilling rigs, three of which are primarily dedicated to our drilling program.

    Approximately 50% of the average $60,000 to $70,000 total well cost is well
connection cost comprised of gathering lines, power lines and surface equipment.
In the South Gillette Area where we have drilled most of our 135 wells drilled
as of March 22, 1999, we have entered into a gas gathering and compression
agreement with Bear Paw Energy that also provides for well connection services
in return for a per Mcf gathering fee. Accordingly, we have reduced our average
well costs in the South Gillette Area to approximately $30,000 per well in
return for a comprehensive well connection, gathering and compression fee. In
the South Gillette Area, Bear Paw Energy will construct, own and operate all
gathering and compression facilities from the wellhead to the interconnect with
MIGC, Fort Union or Thunder Creek pipelines. We intend to continue to allocate
our capital expenditures to drilling, completion and lease acquisition
activities rather than well connection, gathering and compression activities.

                                       21
<PAGE>
DRILLING ACTIVITY

    The following table summarizes our drilling activities, all of which were
located in the Powder River Basin, during 1998:

<TABLE>
<CAPTION>
                                                              WELLS DRILLED
                                                          ----------------------
                                                          PERIOD FROM INCEPTION
                                                          (JANUARY 26, 1998) TO
                                                            DECEMBER 31, 1998
                                                          ----------------------
                                                             GROSS        NET
                                                          -----------     ---
<S>                                                       <C>          <C>
Development
  Natural Gas...........................................          30          28
  Non-productive........................................          --          --
                                                                 ---         ---
    Total...............................................          30          28
                                                                 ---         ---
                                                                 ---         ---
Exploratory
  Natural Gas...........................................           2           2
  Non-productive........................................          --          --
                                                                 ---         ---
    Total...............................................           2           2
                                                                 ---         ---
                                                                 ---         ---
</TABLE>

    All of the above wells were drilled in 1998 and no wells were in the process
of being drilled on December 31, 1998.

NATURAL GAS RESERVES

    The table below sets forth our quantities of proved reserves as of December
31, 1998, all of which were located in the United States, and the present value
of future net revenue attributed to those reserves. The estimates were prepared
for us by the independent petroleum engineering firm of Ryder Scott Company.

<TABLE>
<CAPTION>
                                                                             DECEMBER 31, 1998
                                                                             -----------------
<S>                                                                          <C>
Proved Reserves
  Natural Gas (Bcf)........................................................             18.1
  Oil and condensate (MMbls)...............................................               --
                                                                             -----------------
    Total (Bcfe)...........................................................             18.1
                                                                             -----------------
                                                                             -----------------
Proved developed reserves (Bcfe)...........................................              5.5

Standardized measure of discounted future net cash flows...................    $   6,142,000
                                                                             -----------------
                                                                             -----------------
</TABLE>

    In accordance with SEC requirements, estimates of our proved reserves and
future net revenues are made using sales prices estimated to be in effect as of
the date of such reserve estimates and are held constant throughout the life of
the properties, except to the extent a contract specifically provides for
escalation. Estimated quantities of proved reserves and future net revenues
therefrom are affected by natural gas and oil prices, which have fluctuated
widely in recent years. There are numerous uncertainties inherent in estimating
natural gas and oil reserves and their estimated values, including many factors
beyond the control of the producer. The reserve data set forth in this document
represents only estimates. Reservoir engineering is a subjective process of
estimating underground accumulation of natural gas and oil that cannot be
measured in an exact manner. The accuracy of any reserve estimate is a function
of the quality of available data and of engineering and geological
interpretation and judgment. As a result, estimates of different engineers,
including those used by Pennaco, may vary. In addition, estimates of reserves
are subject to revision based upon actual production, results of future
development and exploration activities, prevailing natural gas and oil prices,
operating costs and other factors, which revisions may be material. Accordingly,
reserve estimates are often different from the quantities of natural gas and oil
that are ultimately recovered and are highly dependent upon the accuracy of the
assumptions upon which they are based.

                                       22
<PAGE>
    In general, the volume of production from natural gas properties we own
declines as reserves are depleted. Except to the extent we acquire additional
properties containing proved reserves or conduct successful exploration and
development activities, or both, our proved reserves will decline as reserves
are produced. Volumes generated from our future activities are therefore highly
dependent upon the level of success in acquiring or finding additional reserves
and the costs incurred in doing so.

    You should read Note 9--"Information Regarding Proved Oil and Gas
Reserves--Unaudited" to the Financial Statements included in this document for
additional information pertaining to our proved natural gas reserves as of
December 31, 1998.

PRODUCTION

    We had no oil and gas production in 1998. We commenced natural gas
production in April 1999. See "Item 1--Description of Business--General". Our
current net working interest gas production is approximately 11 MMcf per day
from 90 producing wells.

PRODUCTIVE WELLS

    The following table sets forth, as of December 31, 1998, the number of gross
and net productive oil and gas wells in which we owned an interest. Productive
wells are producing wells and wells capable of production, including shut-in
wells.

<TABLE>
<CAPTION>
               PRODUCTIVE WELLS
- ----------------------------------------------
     NATURAL GAS                 OIL
- ----------------------  ----------------------
   GROSS        NET        GROSS        NET
- -----------     ---     -----------     ---
<S>          <C>        <C>          <C>
        32          30          --          --
</TABLE>

DEVELOPED AND UNDEVELOPED ACREAGE

    The gross and net acres of developed and undeveloped oil and gas leases we
held as of December 31, 1998 are summarized in the following table. "Undeveloped
Acreage" includes leasehold interests that contain proved undeveloped reserves.


<TABLE>
<CAPTION>
                                                                                                PRO FORMA(2)
                                                                                 ------------------------------------------
                                      DEVELOPED ACREAGE        UNDEVELOPED        DEVELOPED ACREAGE        UNDEVELOPED
                                                                ACREAGE(1)                                  ACREAGE(1)
                                     --------------------  --------------------  --------------------  --------------------
                                       GROSS       NET       GROSS       NET       GROSS       NET       GROSS       NET
                                     ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------
<S>                                  <C>        <C>        <C>        <C>        <C>        <C>        <C>        <C>
Wyoming............................      1,760      1,604    461,025    312,725      1,760      1,604    461,025    212,890
Montana............................         --         --    208,227    167,388         --         --    208,227     92,044
                                     ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------
  Total............................      1,760      1,604    669,252    480,113      1,760      1,604    669,252    304,934
                                     ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------
                                     ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------
</TABLE>


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

(1) Undeveloped acreage is leased acreage on which wells have not been drilled
    or completed to a point that would permit the production of commercial
    quantities of natural gas and oil regardless of whether the acreage contains
    proved reserves. Of the aggregate 669,252 gross and 480,113 net undeveloped
    acres, 23,470 gross and 20,166 net acres are held by production from other
    leasehold acreage generally owned and operated by third parties.

(2) Pro forma to give effect to the closing of the CMS transaction which
    occurred on January 15, 1999. See "Item 1--Description of Business--CMS
    Transaction." Approximately 20,000 net undeveloped acres are subject to an
    election to purchase on behalf of CMS pursuant to the terms of the CMS
    transaction.

    A majority of the leases summarized in the preceding table will expire at
the end of their respective primary terms unless the existing leases are renewed
or production has been obtained from the acreage subject to the lease prior to
that date, in which event the lease will remain in effect until the cessation of

                                       23
<PAGE>
production. The following table sets forth the gross and net acres to leases
summarized in the preceding table that will expire during the period indicated:

<TABLE>
<CAPTION>
                                                                              PRO FORMA(2)
                                                                          --------------------
                                                    UNDEVELOPED ACREAGE   UNDEVELOPED ACREAGE
ACRES EXPIRING                                      --------------------  --------------------
TWELVE MONTHS ENDING                                  GROSS       NET       GROSS       NET
- --------------------------------------------------  ---------  ---------  ---------  ---------
<S>                                                 <C>        <C>        <C>        <C>
December 31, 1999.................................      4,616      4,077      4,616      3,917
December 31, 2000.................................      3,241      2,892      3,241      2,331
December 31, 2001.................................      6,765      4,929      6,765      4,403
December 31, 2002.................................     56,269     20,789     56,269     14,444
December 31, 2003 and thereafter..................    574,891    427,260    574,891    264,365
                                                    ---------  ---------  ---------  ---------
Primary Term Acreage..............................    645,782    459,947    645,782    289,460
Held by Production Acreage(1).....................     23,470     20,166     23,470     15,474
                                                    ---------  ---------  ---------  ---------
Total Undeveloped Acreage.........................    669,252    480,113    669,252    304,934
                                                    ---------  ---------  ---------  ---------
                                                    ---------  ---------  ---------  ---------
</TABLE>

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

(1) Held by production acreage is leasehold interest in oil and gas properties,
    which is beyond its primary term and is being kept in force by virtue of
    production of oil and gas in commercial quantities.

(2) Pro forma to give effect to the closing of the CMS transaction which
    occurred on January 15, 1999. See "Item 1--Description of Business--CMS
    Transaction." Approximately 20,000 net undeveloped acres are subject to an
    election to purchase on behalf of CMS pursuant to the terms of the CMS
    transaction.

PROPERTIES

    Following the second closing of the CMS transaction on January 15, 1999, we
owned oil and gas leases covering approximately 304,934 net acres in the Powder
River Basin of Wyoming and Montana. Since the second closing, we have acquired
an additional 6,800 net acres outside of the Pennaco/CMS area of mutual
interest, increasing our leasehold total to approximately 311,800 net acres as
of March 1, 1999. Approximately 56% of the acreage is located on federal and
state land and approximately 44% of the acreage is located on private land. Our
leases generally have five to ten year primary terms. The federal leases are
generally ten year term leases and newly acquired fee and state leases are
generally five-year term leases.

    Our Powder River Basin leasehold can generally be divided into four separate
project areas as follows:

    SOUTH GILLETTE AREA--We now hold approximately 16,000 net acres in this
project area located near the town of Gillette, Wyoming and outside the CMS area
of mutual interest. We began our initial drilling program in this area and 180
of our 197 gas wells drilled as of June 15, 1999 are located here. We operate
all of our South Gillette Area wells which have an average 93% working interest.
The wells are either producing or are in the process of being tested, dewatered
and connected to gathering and compression systems. Our first gas production
began flowing from this area in April 1999.

    NORTHERN FAIRWAY AREA--We hold approximately 142,000 net acres in this
project area located north of the town of Gillette, Wyoming, up to the Wyoming
border on the east side of the basin. Virtually all of our leasehold acreage in
this area is included in the area of mutual interest with CMS. We drilled and
are the operator of 11 exploratory coal bed methane wells in the Spotted Horse
Prospect located in this area. We also drilled and are the operator of five
exploratory coal bed methane wells in the Collums Prospect. The wells in these
two prospects are in the process of completion and testing.

    BORDER AREA--We hold approximately 92,000 net acres in this project area
located in Montana adjoining the Wyoming border adjacent to the Northern Fairway
Area and the Sherian Area. All of our leasehold in this area is included in the
area of mutual interest with CMS. While we have not drilled any wells in this
area, some industry coal bed methane drilling activity has occurred adjacent to
the Border Area with encouraging results.

                                       24
<PAGE>
    SHERIDAN AREA--We hold approximately 62,000 net acres in this project area
located in Wyoming primarily east of the town of Sheridan on the west side of
the basin. Virtually all of our leasehold in this area is included in the area
of mutual interest with CMS. We have not drilled any wells in this area.

    Historically, oil and gas has been produced from a number of other
reservoirs in the Powder River Basin that are typically greater in depth than
coal bed methane locations. Over 75% of our leasehold acreage allow for
development of all depths. These leases cover both the shallow coal bed methane
and exploration potential for oil and gas from the deeper horizons. Past
exploration of the sedimentary section below the Paleocene coal section has
resulted in production from sandstone reservoirs in 25 formations from upper
Cretaceous to Pennsylvanian age. No such production has been generated from our
leases.

TITLE TO PROPERTIES

    As is customary in the oil and gas industry, only a preliminary title
examination is conducted at the time we acquire oil and gas leases covering
properties believed to be suitable for drilling operations. Prior to the
commencement of drilling operations, a thorough title examination of the drill
site tract is conducted by independent attorneys. Once production from a given
well is established, we prepare a division order title report indicating the
proper parties and percentages for payment of production proceeds, including
royalties. We believe that title to our leasehold properties is good and
defensible in accordance with standards generally acceptable in the oil and gas
industry. Our properties are subject to customary royalty interests, liens
incident to operating agreements, liens for current taxes and other burdens
which we believe do not materially interfere with the use of or affect the value
of such properties.

OFFICE FACILITIES

    Our office space is currently subleased pursuant to an agreement with
Evansgroup, Inc. The term of the sublease commenced on April 6, 1998 and expires
on September 30, 2000. The sublease covers approximately 11,524 square feet at a
yearly rent of approximately $173,000.

    We also lease office and lodging space in Gillette, Wyoming. The lease
covers approximately 9,000 square feet at a yearly rent of approximately
$17,400. In February 1999 a new lease/purchase agreement was entered into
whereby the term of the lease/purchase agreement commences on April 4, 1999 and
expires December 31, 2000. The yearly rent is approximately $17,400. Under terms
of the purchase option, $1,000 per month of the rent is deemed to apply to a
purchase option on the property. The purchase option expires January 7, 2001.

                                       25
<PAGE>
                                   MANAGEMENT

    The following tables show our officers, directors, and key employees and
consultants:
<TABLE>
<CAPTION>
EXECUTIVE OFFICERS AND DIRECTORS                          AGE                             POSITION
- ----------------------------------------------------      ---      ------------------------------------------------------
<S>                                                   <C>          <C>
Jeffrey L. Taylor...................................          31   Chairman of the Board, Director
Paul M. Rady........................................          45   President, Chief Executive Officer, Director
Glen C. Warren, Jr..................................          43   Chief Financial Officer, Executive Vice President,
                                                                   Director
Gregory V. Gibson...................................          49   Vice President, Legal, Secretary, Director
Terrell A. Dobkins..................................          46   Vice President of Production
Brian A. Kuhn.......................................          40   Vice President of Land
David W. Lanza......................................          30   Director

<CAPTION>

OTHER KEY EMPLOYEES AND CONSULTANTS                       AGE                             POSITION
- ----------------------------------------------------      ---      ------------------------------------------------------
<S>                                                   <C>          <C>
William Travis Brown, Jr............................          53   Co-Manager, Geology
Gregory S. Hinds....................................          35   Co-Manager, Geology
Dirck Tromp.........................................          32   Staff Geologist
John Dolloff........................................          69   Senior Geological Consultant
Charles E. Brammeier................................          42   Controller
</TABLE>

    JEFFREY L. TAYLOR, CHAIRMAN OF THE BOARD, DIRECTOR

    Currently Mr. Taylor is the President and Director of Foreign Investments
for the London Taylor Group. The London Taylor Group is a southern
California-based financial service provider acting as venture capitalist and
investment banker to private and small cap public companies. During the last
five years, Mr. Taylor has been a Member of the Board of Directors of various
public companies including, TransAmerica Industries, Yuma Gold Mines, and
Cornucopia Resources. He has also served during the last five years as Vice
President of Metallica Resources, Vice President of Goldbelt Resources, Vice
President of Arrowhead Minerals Corporation, and Executive Vice President of
Corporate Finance of Ultra Petroleum. Prior to founding the London Taylor Group,
Mr. Taylor was an analyst and financial service provider for Global Resource
Investments, Inc. of Carlsbad, California and the Chief Financial Officer for
International Art Commission of San Francisco, California. Mr. Taylor holds a
Master of Business Administration, Finance degree from the University of San
Diego.

    PAUL M. RADY, CHIEF EXECUTIVE OFFICER, PRESIDENT, DIRECTOR

    Mr. Rady joined the Company in June 1998 as its Chief Executive Officer,
President and Director. Mr. Rady has entered into an employment agreement with
an initial term of four years with automatic renewal provisions. Mr. Rady was
with Barrett Resources Corporation, an oil and gas exploration and production
company listed on the New York Stock Exchange, for approximately eight years.
During his tenure at Barrett, Mr. Rady held various executive positions
including his most recent position as Chief Executive Officer, President and
Director. As Chief Executive Officer he was responsible for all aspects of the
Company including, operations, financings, representing the corporation to the
investment community, and working with the Board of Directors to set the
direction of the Company. Other positions held by Mr. Rady were Chief Operating
Officer, Executive Vice President--Exploration, and Chief Geologist--
Exploration Manager. Prior to his employment at Barrett, Mr. Rady was with Amoco
Production Company based in Denver, Colorado for approximately 10 years. Mr.
Rady received a Bachelor of Arts degree in Geology from Western State College of
Colorado and a Master of Science degree in Geology from Western Washington
University.

                                       26
<PAGE>
    GLEN C. WARREN, JR., CHIEF FINANCIAL OFFICER, EXECUTIVE VICE PRESIDENT,
     DIRECTOR

    Mr. Warren joined the Company in July 1998 as its Chief Financial Officer,
Executive Vice President and Director. Mr. Warren has entered into an employment
contract with an initial term of four years with automatic renewal provisions.
Prior to assuming his duties as the Company's Chief Financial Officer, Mr.
Warren was an investment banker with Lehman Brothers Inc. in New York and
focused on equity and debt financing, as well as mergers and acquisitions for
energy and natural resource companies. Prior to Lehman Brothers, Mr. Warren was
also an investment banker with Dillon, Read & Co., Inc. and Kidder, Peabody &
Co. Incorporated with a total of nine years of investment banking experience.
Mr. Warren also has six years of oil and gas exploration and production
experience with Amoco Production Company in New Orleans. Mr. Warren received a
Master of Business Administration degree from the Anderson Graduate School of
Management at U.C.L.A. and a Juris Doctorate degree and a Bachelor of Arts
degree in Interdisciplinary Science, both from the University of Mississippi.

    GREGORY V. GIBSON, VICE PRESIDENT, LEGAL, SECRETARY, DIRECTOR

    Mr. Gibson has been an attorney specializing in securities and securities
broker dealerships for over 15 years. Mr. Gibson is a southern California-based
practicing attorney with the law firm of Gibson, Haglund & Johnson. Prior to his
present affiliations, Mr. Gibson was corporate counsel for three years to Global
Resource Investment Limited, a southern California-based broker-dealer
specializing in resource and foreign publicly traded securities. Prior to
working at Global, Mr. Gibson was practicing securities and international law
with the law firms of Gibson & Haglund and Gibson, Ogden & Johnson. Mr. Gibson
attended Claremont Men's College and Brigham Young University for undergraduate
studies and received his Juris Doctorate degree from Pepperdine University
School of Law.

    TERRELL A. DOBKINS, VICE PRESIDENT--PRODUCTION

    Mr. Dobkins has over 20 years experience in the oil and gas industry. Mr.
Dobkins started his career at Amoco Production Company where he had extensive
experience in Rocky Mountain Low Permeability Gas Reservoirs and worked in
operations, completions and reservoir engineering. Mr. Dobkins worked as a
Manager for three years at American Hunter Exploration where he was involved in
all U.S. operations and engineering. More recently, Mr. Dobkins served eight
years at Barrett Resources, most recently as Manager of Acquisitions, and was
involved in the development of several projects, including completions,
operations and reservoir engineering. Mr. Dobkins received a Bachelor of Science
degree in Chemical Engineering from the University of New Mexico.

    BRIAN A. KUHN, VICE PRESIDENT--LAND

    Mr. Kuhn has 18 years experience in the oil and gas industry as a landman.
Mr. Kuhn worked as a landman for thirteen years at Amoco Production Company from
June 1980 to April 1993. While at Amoco, Mr. Kuhn spent three years in the
Powder River Basin and other basins of the Rocky Mountain region. Most recently,
Mr. Kuhn was employed as a Division Landman for five years at Barrett Resources
Corporation where he worked in the Rocky Mountain region and numerous other
basins. Mr. Kuhn has extensive experience in the acquisition of producing
properties, testifying as expert witness before state regulatory agencies,
management of lease acquisition and negotiation of both large and small
exploration transactions. Mr. Kuhn earned a Bachelor of Business Administration
degree in Petroleum Land Management from the University of Oklahoma in May 1980.
Mr. Kuhn is also a member of the American Association of Petroleum Landmen,
Oklahoma City Association of Petroleum Landmen and the Tulsa Association of
Petroleum Landmen.

                                       27
<PAGE>
    DAVID W. LANZA, DIRECTOR

    Mr. Lanza has been a real estate developer, oil and gas real property and
lease developer, and business owner in California, Nevada, Colorado, Texas and
Wyoming for the past ten years. He is currently the President of Hust Brothers,
a commercial real estate and development company, Vice President and principal
of Hust Brothers Inc., a national automotive wholesale company, and President
and principal of Colusa Motor Sales. Mr. Lanza has majority interest in
Marysville Auto Parts which owns and operates 13 automotive chain stores. Mr.
Lanza graduated from the University of Southern California receiving his
Bachelor of Science in Business Administration.

    WILLIAM TRAVIS BROWN, JR., CO-MANAGER, GEOLOGY

    Mr. Brown is a senior geologist for Pennaco with 32 years of experience in
the oil and gas industry. He began his career with Amoco in 1969 as an
operations and production geologist in the Rocky Mountain Region. He has
extensive experience in the Green River and Powder River Basins. From 1969 to
present, Mr. Brown has conducted extensive work in 3-D seismic & stratigraphic
analysis, geological mapping, well site analysis, and strategic land acquisition
for several companies including Amoco Production, Lear Petroleum, Davis Oil, and
Coastal Oil and Gas where he initiated the coal degassification CBM project in
the Powder River Basin. Mr. Brown received his Bachelor of Science degree in
Geology at Columbia University and his Master of Science and Ph.D. candidacy in
Geology at the University of New Mexico.

    GREGORY S. HINDS, CO-MANAGER, GEOLOGY

    Mr. Hinds is a senior geologist for the company with nine years of
experience in the oil and gas industry. He began his career with Enserch
Exploration as an exploration geologist, primarily working the Permian Basin of
West Texas and the Austin Chalk trend of the Texas coastal plan. He then joined
Barrett Resources as an Operations geologist, ultimately advancing to the
position of senior exploration geologist. Mr. Hinds has had exposure to
virtually all Rocky Mountain Basins as well as every producing region in Texas
and the Mid-continent. Throughout his career, he has utilized 3-D seismic,
horizontal drilling and numerous computer applications in the search for oil and
gas. Mr. Hinds received his Bachelor of Science degree in Geology from Louisiana
State University and his Master of Science in Geology from Texas A&M University.

    DIRCK TROMP, STAFF GEOLOGIST

    Mr. Tromp is a certified professional geologist with nine years of varied
geologic and hydrogeologic experience in the petroleum, mining, and
environmental fields. He began his career as a research geologist with the U.S.
Geological Survey. The majority of his experience has been as a hydrogeologist
and geochemist with Roy F. Weston, Inc., an international environmental
consulting firm. Mr. Tromp has extensive experience with digital mapping, 3-D
computer hydrologic conceptual modeling and groundwater flow modeling. He has
designed and installed groundwater systems and hydrocarbon recovery wells. He
has a strong working knowledge of environmental compliance requirements. Mr.
Tromp holds a Bachelor of Science degree in Geological Engineering and Master of
Science degree in Geology/ Geochemistry both from the Colorado School of Mines.

    JOHN DOLLOFF, SENIOR GEOLOGY CONSULTANT

    Mr. Dollof is a consulting senior geologist to the Company. Mr. Dolloff has
over 40 years of exploration and production geology and management experience in
the Rocky Mountain, Mid-Continent and west Texas areas. Beginning his career
with Standard Oil of Texas, he was staff geologist with the predecessor of
Champlin Petroleum (Union Pacific Resources) where he advanced to become
District Manager. He became Regional Manager for Helmerich & Payne and for nine
years he managed an 11-state oil and gas exploration program. He has also served
as exploration manager and Senior Vice-

                                       28
<PAGE>
President for several petroleum companies in the Rocky Mountain Region. Mr.
Dolloff earned his Bachelor of Science degree in Geology from Yale University
and Master of Science degree in Geology from University of Minnesota.

    CHARLES E. BRAMMEIER, CONTROLLER

    Mr. Brammeier has 19 years of accounting experience in the oil and gas
industry where he has been extensively involved in filings with the Securities
and Exchange Commission as well as property acquisitions. Prior to his joining
the Company, Mr. Brammeier worked for ten years at Presidio Oil Company where he
became Vice President of Accounting--Controller. Prior to Presidio Oil Company,
Mr. Brammeier worked for nine years in various capacities at Petro-Lewis
Corporation. Mr. Brammeier earned a Bachelor of Science degree in Accounting
from Colorado State University and is a Certified Public Accountant.

    The board of directors is divided into three separate classes. Class I
consists of Mr. Taylor, whose terms will expire at the 2000 annual meeting.
Class II consists of Messrs. Warren and Lanza, whose terms will expire at the
2001 annual meeting. Class III consists of Messrs. Rady and Gibson, whose terms
will expire at the 2002 annual meeting. The term of office for directors elected
at each annual meeting is three years.

EXECUTIVE COMPENSATION

    We have entered into four-year employment agreements with Paul M. Rady, who
was hired in June 1998, and Glen C. Warren, Jr., who was hired in July 1998.

    The employment agreement with Mr. Rady provides for a salary of $120,000 per
year, bonus compensation equal to 2% of Pennaco's net cash flow, participation
in our standard insurance plans for our executives, and participation in our
other incentive compensation programs at the discretion of the Board of
Directors. Mr. Rady was granted 400,000 stock options exercisable at $2.50 per
share and 400,000 stock options exercisable at $5.00 per share which vest
ratably over a four-year period commencing in June 1999. Mr. Rady's stock
options are subject to accelerated vesting in the event of his termination
without cause or in the event of a change of control. The stock options expire
in 2008, subject to earlier termination if the employment is terminated. If Mr.
Rady's employment with Pennaco is terminated without cause prior to June 1,
1999, Mr. Rady is entitled to termination compensation of $2,000,000. If Mr.
Rady's employment is terminated without cause after June 1, 1999, Mr. Rady is
entitled to termination compensation of $3,000,000. Mr. Rady's employment
agreement automatically renews on each anniversary of the effective date after
June 1, 2001 for an additional two years unless we notify Mr. Rady in writing 90
days prior to such anniversary that we will not be renewing his employment
agreement.

    The employment agreement with Mr. Warren provides for a salary of $100,000
per year, bonus compensation of $150,000 for 1999 and equal to 1% of Pennaco's
net cash flow thereafter, participation in our standard insurance plans for our
executives, and participation in our other incentive compensation programs at
the discretion of the Board of Directors. Mr. Warren was granted 200,000 stock
options exercisable at $2.50 per share, 100,000 stock options exercisable at
$3.25 per share, and 200,000 stock options exercisable at $5.00 per share which
vest ratably over a four-year period commencing in July 1999. The stock options
expire in 2008. Mr. Warren's stock options are subject to accelerated vesting in
the event of his termination without cause or in the event of a change of
control. If Mr. Warren's employment with Pennaco is terminated without cause
prior to July 1, 1999, Mr. Warren is entitled to termination compensation of
$400,000. If Mr. Warren's employment is terminated without cause after July 1,
1999 but before July 1, 2000, Mr. Warren is entitled to termination compensation
of $750,000. If Mr. Warren's employment with is terminated without cause after
July 1, 2000, Mr. Warren is entitled to termination

                                       29
<PAGE>
compensation of $1,250,000. Mr. Warren's employment agreement automatically
renews on each anniversary of the effective date after June 1, 2002 for an
additional year, unless we notify Mr. Warren in writing 90 days prior to such
anniversary that we will not be renewing his employment agreement.

    The following table provides summary information concerning compensation
earned by our Chief Executive Officer and our three most highly compensated
officers during the period ended December 31, 1998.

                           SUMMARY COMPENSATION TABLE

<TABLE>
<CAPTION>
                                                                                                   LONG-TERM
                                                                                                  COMPENSATION
                                                                    ANNUAL                           AWARDS
                                                                 COMPENSATION      OTHER ANNUAL    SECURITIES
                                                              ------------------   COMPENSATION    UNDERLYING     ALL OTHER
NAME AND PRINCIPAL POSITION                                     SALARY     BONUS       (1)        OPTIONS (#)    COMPENSATION
- ------------------------------------------------------------  ----------   -----   ------------   ------------   ------------
<S>                                                           <C>          <C>     <C>            <C>            <C>
Paul W. Rady ...............................................
  President and Chief Executive Officer                        $65,077(2)   --        --            800,000         --

Glen C. Warren, Jr. ........................................
  Chief Financial Officer and Executive Vice President          49,680(3)   --        --            513,228         --

Terrell A. Dobkins .........................................
  Vice President--Production                                    46,465(4)   --        --            250,000         --

Brian A. Kuhn ..............................................
  Vice President--Land                                          41,548(5)   --        --            150,000         --
</TABLE>

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

(1) We recognized non-cash compensation expense relating to restricted common
    stock and warrants purchased by Mr. Warren of $675,000, and stock options
    issued to Mr. Dobkins of $556,250 and Mr. Kuhn of $412,500, respectively, in
    the third quarter of 1998. This non-cash expense was recognized in
    accordance with APB No. 25, "Accounting for Stock Issued to Employees."
    Compensation expense was calculated based on the difference between the
    closing price per share on the last trading day prior to the date of
    purchase and the $1.75 unit price for restricted shares and warrants
    purchased by Mr. Warren. Compensation expense for Mr. Dobkins and Mr. Kuhn
    was calculated based on the difference between the closing price per share
    on the last trading day prior to the date of employment and the exercise
    price for options awarded. The restricted securities were offered as
    incentive to attract a senior management team. We believe that the offers
    made by the Board of Directors in June 1999 were at market value due to the
    restricted nature of the securities to be issued and the lack of a liquid
    trading market for our common stock at the time the offers were made which
    was prior to the date that our stock was first quoted on the OTC Bulletin
    Board system. However, APB No. 25 requires the measurement of compensation
    expense at the date of employment rather than at the offer date. Further,
    APB No. 25 requires that compensation be measured based on the quoted market
    price of our stock once the stock is publicly traded. While we were not an
    SEC registrant until September 8, 1998, our shares were quoted on the OTC
    Bulletin Board system beginning July 1, 1998. Our shares were initially
    listed on the American Stock Exchange on April 19, 1999.

(2) Mr. Rady became an executive officer on June 16, 1998, compensated at an
    annual salary of $120,000.

(3) Mr. Warren became an executive officer on July 2, 1998, compensated at an
    annual salary of $100,000.

(4) Mr. Dobkins became an officer on July 6, 1998, compensated at an annual
    salary of $95,000.

                                       30
<PAGE>
(5) Mr. Kuhn became an officer on July 9, 1998, compensated at an annual salary
    of $87,000.

1998 STOCK OPTION AND INCENTIVE PLAN

    On March 24, 1998, the Board of Directors adopted the 1998 Stock Option and
Incentive Plan which was subsequently approved by our stockholders. Our
stockholders approved an amendment to the plan on June 29, 1998. The plan is
intended to provide incentive to key employees and directors of, and key
consultants, vendors, customers, and others

    - expected to provide significant services to Pennaco,

    - to encourage proprietary interest in Pennaco,

    - to encourage such key employees to remain in our employ,

    - to attract new employees with outstanding qualifications, and

    - to afford additional incentive to consultants, vendors, customers, and
      others to increase their efforts in providing significant services to the
      Company.

The plan is administered by the Board of Directors or can be administered by a
committee appointed by the Board of Directors, which committee shall be
constituted to permit the plan to comply with Rule 16b-3 of the Act, and which
shall consist of not less than two members. The Board of Directors, or the
committee if there is one, at its discretion, can select the eligible employees
and consultants to be granted awards, determine the number of shares to be
applicable to such award, and designate any options as incentive stock options
or nonstatutory stock options, except that no incentive stock option may be
granted to a non-employee director or a non-employee consultant. The stock
subject to awards granted under the plan are shares of our authorized but
unissued or reacquired common stock. The aggregate number of shares which may be
issued as awards or upon exercise of awards under the plan is 4,500,000 shares.
As of December 31, 1998, non-statutory stock options to purchase 2,969,365 have
been granted to key employees and directors for exercise prices ranging from
$1.25 to $5.00 per share pursuant to the vesting schedules of the respective
agreements. Options in the amount of 616,500 are vested as of December 31, 1998
while the balance of the options vest over the passage of time or are tied to
certain benchmarks being achieved with regards to the drilling of wells or
obtaining certain annual gross production revenues. The shares that may
presently be issued pursuant to the exercise of an option awarded by the plan
have not been registered under the Securities Act of 1933, any state securities
authority, nor any foreign securities authority, and will be subject to the
limitations of Rule 144.

    The following table reflects certain information regarding stock options
granted to the Named Executive Officers during the period ended December 31,
1998.

                                       31
<PAGE>
                       OPTION GRANTS IN LAST FISCAL YEAR

<TABLE>
<CAPTION>
                                                                 INDIVIDUAL GRANTS
                                                           ------------------------------
                                                             PERCENTAGE OF
                                                             TOTAL OPTIONS
                                             NUMBER OF        GRANTED TO
                                            SECURITIES      EMPLOYEES AS OF    EXERCISE
                                            UNDERLYING     THE PERIOD ENDED    PRICE PER
                                          OPTIONS GRANTED  DECEMBER 31, 1998     SHARE          EXPIRATION DATE
                                          ---------------  -----------------  -----------  --------------------------
<S>                                       <C>              <C>                <C>          <C>
Paul M. Rady............................       400,000              13.5%      $    2.50         June 15, 2008
                                               400,000              13.5%      $    5.00         June 15, 2008

Glen C. Warren, Jr......................       200,000               6.8%      $    2.50          July 1, 2008
                                               100,000               3.4%      $    3.25          July 1, 2008
                                               200,000               6.8%      $    5.00          July 1, 2008
                                                13,228               0.4%      $    3.25       September 3, 2008

Terrell A. Dobkins......................       175,000               5.9%      $    3.25   July 6, 2004 through July
                                                                                                   6, 2007(1)
                                                75,000               2.5%      $    2.50   July 6, 2004 through July
                                                                                                   6, 2007(1)

Brian A. Kuhn...........................       100,000               3.4%      $    3.25   July 9, 2004 through July
                                                                                                   9, 2007(1)
                                                50,000               1.7%      $    2.50   July 9, 2004 through July
                                                                                                   9, 2007(1)
</TABLE>

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

(1) Option expiration date is five years subsequent to vesting which occurs
    ratably over a four year period from the date of grant.

    The following table reflects certain information concerning the number of
unexercised options held by the Named Officers and the value of such officers'
unexercised options as of December 31, 1998. No options were exercised by the
Named Officers during the period ended December 31, 1998.

             OPTION VALUES AS OF THE PERIOD ENDED DECEMBER 31, 1998

<TABLE>
<CAPTION>
                                                                      NUMBER OF SECURITIES
                                                                     UNDERLYING UNEXERCISED      VALUE OF UNEXERCISED IN THE
                                                                         OPTIONS HELD AT            MONEY OPTIONS HELD AT
                                                                        DECEMBER 31, 1998           DECEMBER 31, 1998 (1)
                                                                   ---------------------------   ---------------------------
                                                                   EXERCISABLE   UNEXERCISABLE   EXERCISABLE   UNEXERCISABLE
                                                                   -----------   -------------   -----------   -------------
<S>                                                                <C>           <C>             <C>           <C>
Paul W. Rady.....................................................    --             800,000        --            $450,000
Glen C. Warren, Jr...............................................    --             513,228        --             267,460
Terrell A. Dobkins...............................................    --             250,000        --             150,000
Brian A. Kuhn....................................................    --             150,000        --              93,750
</TABLE>

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

(1) Options are "in-the-money" if the closing market price of the Company's
    Common Stock exceeds the exercise price of the options. The exercise price
    of the options granted to the Named Officers is $2.50 per share and $3.25
    per share. The value of unexercised options for each of the Named Officers
    represents the difference between the exercise price of such options and the
    closing price of the Company's Common Stock on December 31, 1998 ($3.625 per
    share).

                 CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS

    If we deal with related parties, the fairness of the transactions will be
reviewed only by members of our Board of Directors that do not have interests in
the transactions.

                                       32
<PAGE>
                       PRINCIPAL AND SELLING STOCKHOLDERS

    The following table sets forth information concerning the beneficial
ownership of the our common stock and stock purchase warrants as of April 15,
1999 for (i) each current director who owns shares, (ii) each officer who owns
shares, (iii) all persons that we know beneficially own more than 5% of the
outstanding shares of our common stock, (iv) all Pennaco officers and directors
as a group, and (v) each of the security holders offering stock for sale
pursuant to this prospectus. All persons listed, unless otherwise noted, have an
address in care of Pennaco's principal executive offices and have sole voting
and investment power with respect to their shares unless otherwise indicated.
The information presented under "Shares Beneficially Owned After Offering"
assumes that all of the shares offered by the selling stockholders will be sold.
Unless otherwise noted, each of the stockholders listed below has an address c/o
Pennaco Energy, Inc., 1050 17th Street, Suite 700, Denver, Colorado 80265.

<TABLE>
<CAPTION>
                                                       SHARES BENEFICIALLY
                                                     OWNED PRIOR TO OFFERING                   SHARES BENEFICIALLY
                                                               (1)                            OWNED AFTER OFFERING
                                                    -------------------------  SHARES BEING  -----------------------
NAME                                                  NUMBER     PERCENT (2)     OFFERED       NUMBER      PERCENT
- --------------------------------------------------  ----------  -------------  ------------  ----------  -----------
<S>                                                 <C>         <C>            <C>           <C>         <C>
Paul M. Rady......................................     857,144(3)         5.7%     285,715      571,429         3.8%
Jeffrey L. Taylor.................................     543,375(4)         3.6%      --          543,375         3.6%
Glen C. Warren, Jr................................     262,500(5)         1.7%      87,500      175,000         1.2%
Gregory V. Gibson.................................     100,000(6)           *       --          100,000           *
David W. Lanza....................................      66,000(7)           *       --           66,000           *
William Travis Brown..............................      87,500(8)           *       25,000       62,500           *
R.I.S. International..............................   2,500,000(9)        16.5%      --        2,500,000        16.5%
State Street Research & Management................   1,500,000 10)         9.9%   1,500,000      --          --
Centennial Energy Partners, L.P...................     300,000 11)         2.0%     300,000      --          --
Tercentennial Energy Partners, L.P................     268,500 11)         1.8%     268,500      --          --
Quadrennial Partners, L.P.........................     250,000 11)         1.7%     250,000      --          --
Investment 11, L.L.C..............................      25,000 11)           *      25,000       --          --
Centennial Overseas Fund, Ltd.....................      20,000 11)           *      20,000       --          --
Arpels Financial Services Corporation.............     165,000          1.1%       165,000       --          --
Excalibur Funds Group.............................     110,000            *        110,000       --          --
Jayvee & Co.......................................      82,500            *         82,500       --          --
Yorkton Securities, Inc. .........................      75,200 12)           *      75,200       --          --
Aton Venture Fund Ltd.............................      41,250            *         41,250       --          --
Yorkton Securities in Trust for
  Michael McMurrich...............................      33,000            *         33,000       --          --
Dynachem, Inc.....................................      27,500            *         27,500       --          --
All officers and directors as a group
  (six persons)...................................   1,904,019         12.6%       373,215    1,530,804        10.1%
</TABLE>

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

  * Represents less than 1% of the common stock outstanding.

 (1) A person is deemed to be the beneficial owner of securities that can be
     acquired by such person within 60 days from the date hereof upon the
     exercise of warrants or options. Each beneficial owner's percentage
     ownership is determined by assuming that options or warrants that are held
     by such person (but not those held by any other person) and which are
     exercisable within 60 days from the date hereof have been exercised.

 (2) Assumes 15,144,179 shares outstanding plus, for each individual, any
     securities that specific person has the right to acquire upon exercise of
     presently exercisable stock options. Options and warrants held by persons
     other than the specific individual for whom an ownership interest
     percentage is being calculated are not considered in calculating that
     specific individual's ownership interest percentage.

                                       33
<PAGE>
 (3) Includes 285,715 shares issuable upon the exercise of presently exercisable
     stock purchase warrants, exercisable at a price of $1.75 per share.

 (4) Includes 400,000 shares issuable to Mr. Taylor upon the exercise of
     currently vested stock options, exercisable at a price of $1.25 per share.
     Mr. Taylor's address is 7220 Avenida Encinas, Suite 204, Carlsbad,
     California 92009.

 (5) Includes 87,500 shares issuable upon the exercise of presently exerciseable
     stock purchase warrants exerciseable at a price of $1.75 per share.

 (6) Represents 100,000 shares issuable upon the exercise of currently vested
     stock options, exercisable at a price of $1.25 per share. Mr. Gibson's
     address is 2 Park Plaza, Suite 450, Irvine, California 92614.

 (7) Includes 50,000 shares issuable upon the exercise of currently vested stock
     options, exercisable at a price of $1.25 per share. Mr. Lanza's address is
     2 Park Plaza, Suite 450, Irvine, California 92614.

 (8) Includes 25,000 shares issuable upon the exercise of presently exercisable
     stock purchase warrants, exercisable at a price of $1.75 per share and
     12,500 shares issuable upon the exercise of currently vested stock options,
     exercisable at a price of $2.50 per share.

 (9) R.I.S. Resources International is a holding company that specializes in
     natural gas development in the western United States. The address of R.I.S.
     is 609 West Hastings Street, 11th Floor, Vancouver, British Columbia V6B
     4W4, Canada. According to the directors and officers of R.I.S., the only
     person who owns more than 10% of the outstanding voting rights of R.I.S. is
     John Hislop, who owns 10.22% of the outstanding R.I.S. common stock.

(10) State Street Research and Management is an Investment Adviser registered
     under Section 203 of the Investment Advisors Act of 1940. The address of
     State Street is One Financial Center, 30th Floor, Boston, Massachusetts
     02111-2640. The shares attributed to State Street are owned by State
     Street's clients.

(11) These shares are under common control. Each entity's address is 900 Third
    Ave., Suite 1801, New York, New York 10022.

(12) Represents 75,200 shares issuable upon the exercise of stock purchase
    warrants with an exercise price of $3.58 per share which expire on September
    3, 2000. The address of Yorkton Securities is 181 Bay Street, Suite 3100,
    Box 830, Toronto, Ontario, M5J 2T3, Canada.

                           DESCRIPTION OF SECURITIES

GENERAL

    Our authorized capital stock consists of 50,000,000 shares of $0.001 par
value common stock and 10,000,000 shares of $0.001 par value preferred stock.
The following summary of the terms and provisions of our capital stock does not
purport to be complete and is qualified in its entirety by reference to our
Articles of Incorporation and By-Laws, which have been filed as exhibits to our
registration statement, of which this prospectus is a part, and applicable law.

COMMON STOCK

    The holders of common stock are entitled to one vote for each share on all
matters voted upon by stockholders, including the election of directors. Such
holders are not entitled to vote cumulatively for the election of directors.
Holders of a majority of the shares of common stock entitled to vote in any
election of directors may elect all of directors standing for election.

    Holders of common stock are entitled to participate pro rata in such
dividends as may be declared in the discretion of the Board of Directors out of
funds legally available therefor. Holders of common stock are entitled to share
ratably in our net assets upon liquidation after payment or provision for all
liabilities.

                                       34
<PAGE>
Holders of common stock have no preemptive rights to purchase shares of Pennaco
stock. Shares of common stock are not subject to any redemption provisions and
are not convertible into any of our other securities. All outstanding shares of
common stock are fully paid and non-assessable.

    Our common stock is listed on the American Stock Exchange system under the
symbol "PN."

    As of April 15, 1999, there were 15,144,179 shares issued and outstanding.

STOCK PURCHASE WARRANTS

    We issued 607,500 warrants with an exercise price of $5.00 per share on
September 4, 1998, via a private placement exempt from the registration
requirements of the Securities Act. These warrants expired on March 4, 1999.

    As of April 15, 1999 we had 398,215 warrants outstanding with an exercise
price of $1.75 per share for the first year of exercisability and $1.96 per
share for the second year of exercisability. 310,715 of these warrants were
issued July 1, 1998 and 87,500 were issued September 4, 1998, via private
placements exempt from the registration requirements of the Securities Act and
may be exercised within two years from the date of issuance.

    As of April 15, 1999 we had 128,000 warrants outstanding with an exercise
price of $1.25 per share issued April 15, 1998, via a private placement
exemption from the registration requirements of the Securities Act. These
warrants are exercisable anytime after April 15, 1999 and expire on April 15,
2000.

    As of April 15, 1999 we had 75,200 warrants outstanding with an exercise
price of $3.58 per share issued September 4, 1998, via a private placement
exemption from the registration requirements of the Securities Act. These
warrants may be exercised any time within two years from the date of issuance.

    No shares underlying the above-referenced warrants have been registered
under the Securities Act.

    As of April 15, 1999 we had 90,000 warrants outstanding with an exercise
price of $4.72 per share issued November 24, 1998, via a private placement
exemption from the registration requirements of the Securities Act. These
warrants are exercisable any time after November 24, 1998 and expire November
24, 2002.

TRANSFER AGENT

    Our transfer agent is: Harris Trust and Savings Bank, P.O. Box A3504,
Chicago, Illinois 60690-3504.

                              PLAN OF DISTRIBUTION

    We are registering the common stock on behalf of selling stockholders. As
used in this prospectus, "selling stockholders" includes donees and pledgees
selling shares received from a named selling stockholder after the date of this
prospectus. All costs, expenses and fees in connection with the registration of
the common stock offered hereby will be paid by us. Brokerage commissions and
similar selling expenses, if any, attributable to the sale of common stock will
be borne by the selling stockholders. Sales of common stock may be effected by
selling stockholders from time to time in one or more types of transactions
(which may include block transactions) through the American Stock Exchange, in
negotiated transactions, through put or call option transactions relating to the
common stock, through short sales of common stock, or a combination of such
methods of sale, at market prices prevailing at the time of sale, or at
negotiated prices. These transactions may or may not involve brokers or dealers.
The selling stockholders have advised us that they have not entered into any
agreements, understandings or arrangements with any underwriters or
broker-dealers regarding the sale of their securities, nor is there an
underwriter or coordinating broker acting in connection with the proposed sale
of common stock by the selling stockholders.

    The selling stockholders may sell common stock directly to purchasers or to
or through broker-dealers, which may act as agents or principals. These
broker-dealers may receive compensation in the form

                                       35
<PAGE>
of discounts, concessions, or commissions from the selling stockholders and/or
purchasers of common stock for whom such broker-dealers may act as agents or to
whom they sell as principal, or both. The compensation as to a particular
broker-dealer might be in excess of customary commissions.

    The selling stockholders and any broker-dealers that act in connection with
the sale of common stock might be deemed to be "underwriters" within the meaning
of Section 2(a)(11) of the Securities Act, and any commissions received by such
broker-dealers and any profit on the resale of the common stock sold by them
while acting as principals might be deemed to be underwriting discounts or
commissions under the Securities Act. We have agreed to indemnify each selling
stockholder against liabilities, including liabilities arising under the
Securities Act. The selling stockholders may agree to indemnify any agent,
dealer or broker-dealer that participates in transactions involving sales of the
common stock against certain liabilities, including liabilities arising under
the Securities Act.

    Because selling stockholders may be deemed to be "underwriters" within the
meaning of Section 2(a)(11) of the Securities Act, the selling stockholders will
be subject to the prospectus delivery requirements of the Securities Act. We
have informed the selling stockholders that the anti-manipulative provisions of
Regulation M promulgated under the Exchange Act may apply to their sales in the
market.

    Selling stockholders also may resell all or a portion of the common stock in
open market transactions in reliance upon Rule 144 under the Securities Act,
provided they meet the criteria and conform to the requirements of the Rule.

    When we are notified by a selling stockholder that any material arrangement
has been entered into with a broker-dealer for the sale of common stock, we will
file a supplement to this prospectus, if required, pursuant to Rule 424(b) under
the Act, disclosing

    - the name of each such selling stockholder and of the participating
      broker-dealer(s),

    - the number of shares of common stock involved,

    - the price at which such shares of common stock were sold,

    - the commissions paid or discounts or concessions allowed to such
      broker-dealer(s), where applicable,

    - that the broker-dealer(s) did not conduct any investigation to verify the
      information set out or incorporated by reference in this prospectus and

    - other facts, material to the transaction.

    In addition, when we are notified by a selling stockholder that a donee or
pledgee intends to sell more than 500 shares, a supplement to this prospectus
will be filed. See "Principal and Selling Stockholders."

                                    EXPERTS

    Some of the information that appears in this registration statement
regarding the December 31, 1998 estimated quantities of reserves of the
underlying properties we own, the future net revenues from those reserves and
their present value is based on estimates of the reserves and present values
prepared by or derived from estimates prepared by Ryder Scott Company
independent petroleum engineers.

    The financial statements of Pennaco Energy, Inc. as of December 31, 1998,
and for the period from January 26, 1998 (inception) to December 31, 1998, have
been included in this prospectus and in the registration statement in reliance
upon the report of KPMG LLP, independent certified public accountants, appearing
elsewhere in this prospectus, and upon the authority of that firm as experts in
accounting and auditing.

                                       36
<PAGE>
                                 LEGAL MATTERS

    The legality of the common stock offered by this prospectus will be passed
upon by Gibson, Haglund & Johnson. Mr. Gibson, a Director of Pennaco, is a
partner with Gibson, Haglund & Johnson and is the beneficial owner of 100,000
shares of our common stock.

                 CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS

    David E. Coffey, C.P.A., the accounting firm that had previously been
engaged as the principal accountant to audit the Company's financial statements,
was dismissed in July 1998. Our Board of Directors approved the dismissal of
David E. Coffey, C.P.A. The audit report previously issued by David E. Coffey,
C.P.A. with respect to our financial statements did not contain an adverse
opinion or a disclaimer of opinion, nor was such report qualified or modified as
to uncertainty, audit scope or accounting principles. Our Board of Directors
approved the selection of KPMG LLP as auditors for our financial statements for
the period ending March 31, 1999, and KPMG LLP was engaged for such purpose in
September 1998.

                         WHERE TO FIND MORE INFORMATION

    We have filed a registration statement on Form SB-2 to register with the SEC
the stock that may be offered by the selling stockholders using this prospectus.
This prospectus is a part of that registration statement. As allowed by SEC
rules, this prospectus does not contain all of the information contained in the
registration statement or the exhibits to the registration statement.

    We are subject to the informational requirements of the Exchange Act.
Accordingly, we file annual, quarterly and current reports, proxy statements,
and other information with the SEC. The public may read and copy any reports,
statements, or other information that we file at the SEC's public reference room
at Judiciary Plaza, 450 Fifth Street N.W., Washington, D.C. 20549. The public
may obtain information on the operation of the public reference room by calling
the SEC at 1-800-SEC-0330. 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."

    You may request a copy of these filings at no cost, by writing or
telephoning us at the following address:

      Pennaco Energy, Inc.
       Attention: Glen C. Warren, Jr.
       1050 17th Street, Suite 700
       Denver, Colorado 80265
       (303) 629-6700

    You should rely on the information contained in this prospectus and any
prospectus supplement. We have not authorized anyone to provide you with
information that is different from what is contained in this prospectus.

    You should not assume that the information contained in this prospectus or
any prospectus supplement is accurate as of any date other than the date on the
front of those documents, and neither the delivery of this prospectus or any
prospectus supplement to you nor the issuance of stock under them will create
any implication to the contrary.

                                       37
<PAGE>
                         INDEX TO FINANCIAL STATEMENTS

<TABLE>
<CAPTION>
<S>                                                                         <C>
  PENNACO ENERGY, INC.--FINANCIAL STATEMENTS:

    Report of Independent Public Accountants..............................   F-2
    Balance Sheet at December 31, 1998....................................   F-3
    Statement of Operations for the period from January 26, 1998
     (inception) to December 31, 1998.....................................   F-4
    Statement of Stockholders' Equity for the period from January 26, 1998
     (inception) to December 31, 1998.....................................   F-5
    Statement of Cash Flows for the period from January 26, 1998
     (inception) to December 31, 1998.....................................   F-6
    Notes to Financial Statements.........................................   F-7

  PENNACO ENERGY, INC.--UNAUDITED FINANCIAL STATEMENTS FOR THE FIRST
    QUARTER OF 1999

    Balance Sheet at March 31, 1999 and December 31, 1998.................  F-18
    Statement of Operations for the three months ended March 31, 1999, the
     period from January 26, 1998 (inception) to March 31, 1998 and the
     cumulative period from January 26, 1998 (inception) to March 31,
     1999.................................................................  F-19
    Statement of Cash Flows for the three months ended March 31, 1999, the
     period from January 26, 1998 (inception) to March 31, 1998 and the
     cumulative period from January 26, 1998 (inception) to March 31,
     1999.................................................................  F-20
    Notes to Financial Statements.........................................  F-21
</TABLE>

                                      F-1
<PAGE>
                        INDEPENDENT ACCOUNTANTS' REPORT

The Board of Directors
Pennaco Energy, Inc.:

    We have audited the accompanying balance sheet of Pennaco Energy, Inc. (a
development stage company) as of December 31, 1998, and the related statements
of operations, stockholders' equity and cash flows for the period from January
26, 1998 (inception) to December 31, 1998. These financial statements are the
responsibility of the Company's management. Our responsibility is to express an
opinion on these financial statements based on our audit.

    We conducted our audit in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements are free of material
misstatement. An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements. An audit also includes
assessing the accounting principles used and significant estimates made by
management, as well as evaluating the overall financial statement presentation.
We believe that our audit provides a reasonable basis for our opinion.

    In our opinion, the financial statements referred to above present fairly,
in all material respects, the financial position of Pennaco Energy, Inc. as of
December 31, 1998, and the results of its operations and its cash flows for the
period from January 26, 1998 (inception) to December 31, 1998, in conformity
with generally accepted accounting principles.

KPMG LLP

Denver, Colorado
March 12, 1999

                                      F-2
<PAGE>
                              PENNACO ENERGY, INC.

                         (A DEVELOPMENT STAGE COMPANY)

                                 BALANCE SHEET

<TABLE>
<CAPTION>
                                                                                           FOR THE YEAR ENDED
                                                                                           DECEMBER 31, 1998
                                                                                      ----------------------------
                                                                                                       PRO FORMA
                                                                                        HISTORICAL      (NOTE 2)
                                                                                      --------------  ------------
<S>                                                                                   <C>             <C>
Current Assets:
  Cash..............................................................................  $    5,622,776    19,804,190
  Accounts receivable...............................................................         374,728       374,728
  Unit subscriptions receivable.....................................................         763,750       763,750
  Assets held for sale..............................................................       6,931,995       --
  Drilling deposit..................................................................         333,473       333,473
  Inventory.........................................................................         231,116       231,116
  Prepaid expenses and other current assets.........................................         151,858       151,858
                                                                                      --------------  ------------
    Total current assets............................................................      14,409,696    21,659,115
                                                                                      --------------  ------------
Property and equipment, at cost:
  Oil and gas properties, using the successful efforts method of accounting (note
    8):
    Unproved........................................................................       4,656,965     4,656,965
    Proved..........................................................................       1,358,769     1,358,769
  Other property and equipment......................................................         296,119       296,119
                                                                                      --------------  ------------
                                                                                           6,311,853     6,311,853
  Less accumulated depreciation.....................................................         (61,607)      (61,607)
                                                                                      --------------  ------------
    Net property and equipment......................................................       6,250,246     6,250,246
                                                                                      --------------  ------------
Deferred income tax asset...........................................................       1,266,000     1,806,000
Other assets........................................................................          99,795        99,795
                                                                                      --------------  ------------
                                                                                      $   22,025,737    29,815,156
                                                                                      --------------  ------------
                                                                                      --------------  ------------
Current liabilities:
  Bridge loan payable (notes 2 and 3)...............................................  $    5,600,000       --
  Lease acquisitions payable........................................................         618,586       --
  Accounts payable and accrued liabilities..........................................       1,964,228     1,964,228
  Income taxes payable..............................................................        --           5,389,000
                                                                                      --------------  ------------
    Total current liabilities.......................................................       8,182,814     7,353,228
                                                                                      --------------  ------------
Stockholders' equity (note 5):
  Common stock, $.001 par value. Authorized 50,000,000 shares; 14,795,179 shares
    issued and outstanding..........................................................          15,152        15,152
  Additional paid-in capital........................................................      17,640,644    17,640,644
  Retained earnings (deficit) accumulated during the development stage..............      (3,812,873)    4,806,132
                                                                                      --------------  ------------
    Total stockholders' equity......................................................      13,842,923    22,461,928
                                                                                      --------------  ------------
Commitments (note 7)
                                                                                      $   22,025,737    29,815,156
                                                                                      --------------  ------------
                                                                                      --------------  ------------
</TABLE>

                See accompanying notes to financial statements.

                                      F-3
<PAGE>
                              PENNACO ENERGY, INC.

                         (A DEVELOPMENT STAGE COMPANY)

                            STATEMENT OF OPERATIONS
         PERIOD FROM JANUARY 26, 1998 (INCEPTION) TO DECEMBER 31, 1998

<TABLE>
<S>                                                                              <C>
Revenue:
  Gain on sale of property.....................................................  $ 1,413,207
  Interest income..............................................................       55,286
                                                                                 -----------
    Total revenue..............................................................    1,468,493
                                                                                 -----------
Expenses:
  Exploration..................................................................    1,825,767
  Depreciation and amortization................................................       61,607
  General and administrative...................................................    3,977,592
  Interest expense.............................................................      682,400
                                                                                 -----------
    Total expenses.............................................................    6,547,366
                                                                                 -----------
    Loss before income taxes...................................................   (5,078,873)
Income tax benefit.............................................................    1,266,000
                                                                                 -----------
    Net loss and deficit accumulated during the development stage..............  $(3,812,873)
                                                                                 -----------
                                                                                 -----------
Loss per share.................................................................        (0.34)
                                                                                 -----------
                                                                                 -----------
Weighted average common shares outstanding.....................................   11,245,298
                                                                                 -----------
                                                                                 -----------
</TABLE>

                See accompanying notes to financial statements.

                                      F-4
<PAGE>
                              PENNACO ENERGY, INC.

                         (A DEVELOPMENT STAGE COMPANY)

                       STATEMENT OF STOCKHOLDERS' EQUITY
         PERIOD FROM JANUARY 26, 1998 (INCEPTION) TO DECEMBER 31, 1998

<TABLE>
<CAPTION>
                                              COMMON STOCK           UNITS      ADDITIONAL
                                         -----------------------     TO BE       PAID-IN     ACCUMULATED
                                            SHARES      AMOUNT      ISSUED       CAPITAL       DEFICIT        TOTAL
                                         ------------  ---------  -----------  ------------  ------------  ------------
<S>                                      <C>           <C>        <C>          <C>           <C>           <C>
Balances at January 26, 1998
  (inception)..........................       --       $  --          --            --            --            --
Common stock issued in connection with
  share exchange (note 1)..............       995,000        995      --               (995)      --            --
Common stock issued for cash, net of
  offering costs of $178,014 (note
  5)...................................    12,030,000     12,030      --         10,607,551       --         10,619,581
Compensation relating to common stock
  and warrants (note 5)................       --          --          --          1,340,000       --          1,340,000
Stock option compensation (note 5).....       --          --          --            450,000       --            450,000
Units issued for cash, net of offering
  costs of $324,675 (note 5)...........     1,770,179      1,770      --          4,231,993       --          4,233,763
Warrants issued for properties and
  services (note 5)....................       --          --          --            248,702       --            248,702
Units to be issued from escrow (note
  5)...................................       356,500     --             357        763,393       --            763,750
Net loss for the period................       --          --          --            --         (3,812,873)   (3,812,873)
                                         ------------  ---------         ---   ------------  ------------  ------------
Balances at December 31, 1998..........    15,151,679  $  14,795         357     17,640,644    (3,812,873)   13,842,923
                                         ------------  ---------         ---   ------------  ------------  ------------
                                         ------------  ---------         ---   ------------  ------------  ------------
</TABLE>

                See accompanying notes to financial statements.

                                      F-5
<PAGE>
                              PENNACO ENERGY, INC.

                         (A DEVELOPMENT STAGE COMPANY)

                            STATEMENT OF CASH FLOWS
         PERIOD FROM JANUARY 26, 1998 (INCEPTION) TO DECEMBER 31, 1998

<TABLE>
<S>                                                                              <C>
Cash flows from operating activities:
  Net loss.....................................................................  $(3,812,873)
  Adjustments to reconcile net loss to net cash used in operating activities:
    Gain on the sale of property...............................................   (1,413,207)
    Depreciation and amortization..............................................       61,607
    Compensation relating to common stock and warrants issued..................    1,340,000
    Stock option compensation..................................................      450,000
    Warrants issued for services...............................................       16,500
    Deferred income tax benefit................................................   (1,266,000)
    Increases in operating assets and liabilities:
      Accounts receivable......................................................     (374,728)
      Prepaid expenses and other current assets................................     (151,858)
      Inventory................................................................     (231,116)
      Other assets.............................................................      (99,795)
      Accounts payable and accrued liabilities.................................    1,964,228
                                                                                 -----------
        Net cash used by operating activities..................................   (3,517,242)
                                                                                 -----------
Cash flows from investing activities:
  Capital expenditures.........................................................  (19,198,439)
  Proceeds from sale of properties.............................................    7,600,000
  Drilling deposit.............................................................     (333,473)
  Increase in lease acquisitions payable.......................................      618,586
                                                                                 -----------
        Net cash used by investing activities..................................  (11,313,326)
                                                                                 -----------
Cash flows from financing activities:
  Proceeds from issuance of bridge loans.......................................    8,800,000
  Repayment of bridge loan.....................................................   (3,200,000)
  Proceeds from issuance of note payable.......................................      500,000
  Repayment of note payable....................................................     (500,000)
  Proceeds from issuance of common stock, net of offering costs................   14,853,344
                                                                                 -----------
        Net cash provided by financing activities..............................   20,453,344
        Net increase in cash...................................................    5,622,776
Cash at beginning of period....................................................      --
                                                                                 -----------
Cash at end of period..........................................................  $ 5,622,776
                                                                                 -----------
                                                                                 -----------
Supplemental disclosures of cash flow information:
  Cash paid for interest.......................................................  $   682,400
                                                                                 -----------
                                                                                 -----------
  Cash paid for income taxes...................................................  $   --
                                                                                 -----------
                                                                                 -----------
</TABLE>

                See accompanying notes to financial statements.

                                      F-6
<PAGE>
                              PENNACO ENERGY, INC.

                         (A DEVELOPMENT STAGE COMPANY)

                               DECEMBER 31, 1998

                         NOTES TO FINANCIAL STATEMENTS

(1) ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

    (a) ORGANIZATION AND BASIS OF PRESENTATION

       Pennaco Energy, Inc. (the "Company") is an independent energy company
       primarily engaged in the acquisition and development of natural gas
       production from coal bed methane properties in the Rocky Mountain region
       of the United States. The Company was incorporated on January 26, 1998
       under the laws of the state of Nevada and its headquarters are in Denver,
       Colorado.

       The Company's activities to date have been limited to organizational
       activities, prospect development activities, acquisition of leases and
       option rights, and commencement of its drilling program. The Company
       currently has oil and gas lease rights in the Powder River Basin in
       northeastern Wyoming and southeastern Montana. Currently the Company has
       no revenue producing operations. Accordingly, the Company is considered
       to be in the development stage.

       The Company was incorporated as a wholly-owned subsidiary of
       International Metal Protection Inc. ("International Metal").
       Subsequently, all of the outstanding shares of International Metal were
       exchanged for shares of the Company and International Metal was merged
       into the Company. The 995,000 shares issued in the exchange were recorded
       at their par value of $.001 per share as International Metal had no
       assets or liabilities at the date of the merger. International Metal and
       its predecessor, AKA Video Communications Inc., had been inactive for the
       two years ended December 31, 1997 and prior thereto.

    (b) USE OF ESTIMATES IN THE PREPARATION OF FINANCIAL STATEMENTS

       The preparation of financial statements in conformity with generally
       accepted accounting principles requires management to make estimates and
       assumptions that affect the reported amounts of assets and liabilities
       and disclosure of contingent assets and liabilities in the financial
       statements and the reported amounts of revenues and expenses during the
       reporting period. Actual results could differ from those estimates.

    (c) SIGNIFICANT RISKS

       The Company is subject to a number of risks and uncertainties inherent in
       the oil and gas industry. Among these are risks related to fluctuating
       oil and gas prices, uncertainties related to the estimation of oil and
       gas reserves and the value of such reserves, effects of competition and
       extensive environmental regulation, risks associated with the search for
       and the development of oil and gas reserves, and many other factors, many
       of which are necessarily beyond the Company's control. The Company's
       financial condition and results of operations will depend significantly
       upon the Company's ability to find and develop natural gas and oil
       reserves and upon the prices received for natural gas and oil produced,
       if any. These prices are subject to fluctuations in response to changes
       in supply, market uncertainty and a variety of additional factors that
       are beyond the control of the Company.

    (d) CASH AND CASH EQUIVALENTS

       The Company considers all highly liquid investments purchased with an
       initial maturity of three months or less to be cash equivalents.

                                      F-7
<PAGE>
                              PENNACO ENERGY, INC.

                         (A DEVELOPMENT STAGE COMPANY)

                               DECEMBER 31, 1998

                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)

(1) ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)
    (e) OIL AND GAS ACTIVITIES

       The Company follows the successful efforts method of accounting for its
       oil and gas activities. Accordingly, costs associated with the
       acquisition, drilling and equipping of successful exploratory wells are
       capitalized. Geological and geophysical costs, delay and surface rentals
       and drilling costs of unsuccessful exploratory wells are charged to
       expense as incurred. Costs of drilling development wells, both successful
       and unsuccessful, are capitalized. Upon the sale or retirement of oil and
       gas properties, the cost thereof and the accumulated depreciation and
       depletion are removed from the accounts and any gain or loss is credited
       or charged to operations. Upon the sale of a partial interest in an
       unproved property, the proceeds are treated as a recovery of cost. If the
       proceeds exceed the carrying amount of the property, a gain is recognized
       in operations. Depletion of capitalized acquisition, exploration and
       development costs is computed on the units-of-production method by
       individual fields as the related proved reserves are produced.

       Capitalized costs of unproved properties are assessed periodically and a
       provision for impairment is recorded, if necessary, through a charge to
       operations.

       Proved oil and gas properties are assessed for impairment on a
       field-by-field basis. If the net capitalized costs of proved oil and gas
       properties exceeds the estimated undiscounted future net cash flows from
       the property a provision for impairment is recorded to reduce the
       carrying value of the property to its estimated fair value.

    (f) OTHER PROPERTY AND EQUIPMENT

       Other property and equipment is recorded at cost. Depreciation and
       amortization is provided using the straight-line method over the
       estimated useful lives of the assets, which range from 3 to 15 years.

    (g) INCOME TAXES

       The Company provides for income taxes using the asset and liability
       method of accounting for income taxes. Under the asset and liability
       method, deferred tax assets and liabilities are recognized for the future
       tax consequences attributable to differences between the financial
       statement carrying amounts of existing assets and liabilities and their
       respective tax bases and net operating loss carryforwards. Deferred tax
       assets and liabilities are measured using enacted income tax rates
       expected to apply to taxable income in the years in which those
       differences are expected to be recovered or settled. Under the asset and
       liability method, the effect on deferred tax assets and liabilities of a
       change in income tax rates is recognized in the results of operations in
       the period that includes the enactment date.

    (h) STOCK-BASED COMPENSATION

       Statement of Financial Accounting Standards No. 123, ACCOUNTING FOR
       STOCK-BASED COMPENSATION (SFAS 123), defines a fair value method of
       accounting for stock compensation plans. SFAS 123 allows an entity to
       measure compensation costs for these plans using the intrinsic value
       based method of accounting as prescribed in Accounting Principles Board
       Opinion No. 25, ACCOUNTING

                                      F-8
<PAGE>
                              PENNACO ENERGY, INC.

                         (A DEVELOPMENT STAGE COMPANY)

                               DECEMBER 31, 1998

                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)

(1) ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)
       FOR STOCK ISSUED TO EMPLOYEES (APB 25), which the Company has elected to
       follow. The pro forma disclosures of net loss and loss per share required
       by SFAS 123 are included in note 5.

    (i) LOSS PER SHARE

       Loss per share is based on the weighted average number of common shares
       outstanding during the period. Outstanding stock options and warrants
       were excluded from the computation as their effect was antidilutive.

(2) CMS TRANSACTION

    On October 23, 1998, the Company and CMS Oil and Gas Company signed a
    definitive agreement (the "CMS Agreement") relating to the development of
    the Company's Powder River Basin acreage (the "CMS Transaction"). Pursuant
    to the terms of the CMS Agreement, CMS Oil and Gas Company will acquire an
    undivided 50% working interest in approximately 492,000 net acres of
    Pennaco's leasehold position in the Powder River Basin for $28,000,000. The
    Company acquired the leasehold position which is being conveyed to CMS in
    the CMS Transaction for approximately $7,000,000. The purchase price
    provided for in the CMS Agreement was the result of arm's length
    negotiations between the Company and CMS. The joint operating agreement
    between the parties will be modeled after the 1989 AAPL Model Form of Joint
    Operating Agreement. The CMS Agreement provides that the parties will in
    good faith negotiate a development agreement for the exploration,
    development and production of coal bed methane from the leases. The
    development agreement will provide that each party will operate
    approximately 50% of the wells drilled in the area of mutual interest.
    Pennaco and CMS have divided the acreage in the area of mutual interest into
    project areas which will be operated by one party or the other. As is
    customary in oil and gas leasehold transactions, the agreement provides for
    the adjustment of the purchase price for title defects discovered prior to
    closing and for the opportunity for one party to participate in acquisitions
    made by the other party in the area of mutual interest defined in the
    agreement. The agreement also provides for a preferential purchase right to
    the other party in the event either CMS or the Company attempts to sell a
    portion of its interest in the acreage covered by the agreement. There is no
    preferential purchase right in the event that either party enters into a
    merger, reorganization or consolidation. All of the leases in the area of
    mutual interest are dedicated to CMS Gas Transmission and Storage, an
    affiliate of CMS Oil and Gas Company, for gathering, compression and
    transportation.

    Pursuant to the terms of the CMS Agreement, CMS agreed to pay Pennaco
    $5,600,000 of earnest money in the form of a non-interest bearing bridge
    loan (the "CMS Bridge Loan") which was secured by substantially all of the
    Company's oil and as leases. Approximately $3,200,000 of such amount was
    paid directly to existing creditors of the Company. The CMS Transaction is
    structured such that the conveyance of the working interests was to occur at
    two separate closings. The first closing occurred on November 20, 1998, and
    the second occurred on January 15, 1999. The Company received $7,600,000 at
    the first closing and received $14,800,000 at the second closing, less
    approximately $1,800,000 which is held in escrow subject to customary
    closing adjustments. As of March 12, 1999, approximately $1,200,000 was held
    in escrow pending CMS closing adjustments. The CMS Bridge Loan was canceled
    at the second closing.

                                      F-9
<PAGE>
                              PENNACO ENERGY, INC.

                         (A DEVELOPMENT STAGE COMPANY)

                               DECEMBER 31, 1998

                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)

(2) CMS TRANSACTION (CONTINUED)
    The unaudited pro forma balance sheet of the Company as of December 31, 1998
    gives effect to the sale of the interest in the properties and the use of a
    portion of the proceeds to repay the bridge loan and the lease acquisitions
    payable, all as if the transactions had occurred on that date.

(3) BRIDGE LOAN

    The Company borrowed $3,200,000 on September 4, 1998 under a bridge loan
    with interest payable at 18% per year. The bridge loan was paid in full on
    October 23, 1998 with proceeds from the CMS Transaction.

(4) INCOME TAXES

    The income tax benefit of $1,266,000 includes a deferred federal income tax
    benefit of $1,196,000 and a deferred state income tax benefit of $70,000.
    The income tax benefit recorded for the period from inception to December
    31, 1998 differs from the expected income tax benefit (based on the
    statutory rate of 34%) primarily as a result of state income taxes, and
    stock and stock option compensation which is not deductible for tax
    purposes.

    At December 31, 1998, the Company has a net operating loss carryforward for
    federal income tax purposes of approximately $431,000 which is available to
    offset future federal taxable income, if any, through 2018. The tax effects
    of temporary differences that give rise to the deferred tax assets at
    December 31, 1998, relate to the net operating loss carryforward.

(5) STOCKHOLDERS' EQUITY

    (a) COMMON STOCK

       Since its formation in January 1998, the Company completed four private
       placement offerings of common stock. In February 1998, 500,000 shares
       were issued at $.10 per share. Proceeds to the Company were approximately
       $50,000. Also in February 1998, 4,530,000 shares were issued at $.22 per
       share. Proceeds to the Company were approximately $997,000. In April
       1998, 5,000,000 shares were issued at $1.25 per share. The proceeds to
       the Company were $6,250,000. In June 1998, 2,000,000 shares were issued
       at $1.75 per share. Proceeds to the Company were approximately
       $3,500,000. The Company incurred approximately $178,014 in offering costs
       relating to these offerings, which have been charged to additional
       paid-in capital.

       In June 1998, the Company offered certain individuals the right to
       acquire common stock at $1.75 per share along with a share purchase
       warrant for every two shares purchased, conditioned upon their acceptance
       of employment as officers of the Company. No compensation cost was
       recorded for the individuals who commenced employment with the Company
       prior to July 1, 1998 (the date the Company's common stock commenced
       trading) as the estimated fair value of common stock approximated the
       common stock issuance price and the warrant exercise price. Compensation

                                      F-10
<PAGE>
                              PENNACO ENERGY, INC.

                         (A DEVELOPMENT STAGE COMPANY)

                               DECEMBER 31, 1998

                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)

(5) STOCKHOLDERS' EQUITY (CONTINUED)

       expense of $450,000 was recorded for the shares and warrants issued
       subsequent to July 1, 1998 based on the difference between the closing
       price per share on the last trading day prior to the date of employment
       with the Company and the common stock issuance price and the warrant
       exercise price.

       During the period from inception to December 31, 1998 a total of 796,429
       units were issued at $1.75 per unit to officers and key employees of the
       Company. The units consist of one share of common stock and one warrant
       for each two shares issued. The warrants have an exercise price of $1.75
       per share in the first year and $1.96 per share in the second year and
       are exercisable at any time. Proceeds to the Company were approximately
       $1,394,000.

       In September 1998, the Company issued 980,000 units at $3.25 per unit.
       Each unit consists of one share of common stock and one warrant for each
       two shares issued. The warrants with an exercise price of $5.00 per share
       expire on March 4, 1999. Proceeds to the Company were approximately
       $3,165,000. Offering costs of $324,675 were charged to additional paid in
       capital.

       Under the terms of the stock subscription agreement, one of the
       subscribers to the offering subscribed for an additional 235,000 units.
       An additional $763,750 was deposited into an escrow account representing
       the aggregate purchase price of the additional 235,000 units. Under the
       terms of the escrow agreement the shares and the shares of common stock
       underlying the warrants were to be registered for resale under the
       Securities Act of 1993 (the "Act") with the U.S. Securities and Exchange
       Commission by December 31, 1998. The Company has also undertaken to have
       the shares qualified by way of an exemption order provided by the
       respective Securities Commissions in Canada.

       The escrow proceeds of $763,750 were deposited into an interest bearing
       escrow account together with certificates representing the units to be
       purchased. Under the terms of the subscription agreement, the
       registration statement was required to be declared effective and the
       Canadian exemption order was to be obtained on or before December 31,
       1998. The registration statement has not been declared effective.
       Accordingly as of December 31, 1998, the subscriber may elect to either
       purchase the escrow units or receive a refund from the escrow account
       paid with their subscription, plus interest thereon, and an additional
       unit for each 10 units purchased in the offering. On February 28, 1999
       all the subscribers elected to receive an additional unit for each 10
       units purchased in the offering and, as a result, an additional 121,500
       units are to be issued. The additional units to be issued have been
       reflected in the accompanying financial statements as units to be issued
       from escrow and the $763,750 to be received from escrow has been
       reflected as unit subscriptions receivable. The subscriber is also
       entitled to receive an additional unit for each 10 units previously
       acquired in the offering in the event that the Company does not maintain
       an effective registration statement until such time as the registered
       securities may be resold pursuant to Rule 144 promulgated under the Act.

                                      F-11
<PAGE>
                              PENNACO ENERGY, INC.

                         (A DEVELOPMENT STAGE COMPANY)

                               DECEMBER 31, 1998

                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)

(5) STOCKHOLDERS' EQUITY (CONTINUED)
    (b) WARRANTS

       At December 31, 1998 the Company has outstanding 607,500 warrants with an
       exercise price of $5.00 per share. These warrants were exercisable any
       time within six months of the date of issuance. The warrants expired
       unexercised on March 4, 1999.

       At December 31, 1998 the Company also has outstanding 398,215 warrants
       with an exercise price of $1.75 per share for the first year and $1.96
       per share for the second year. 310,715 of these warrants were issued July
       1, 1998 and 87,500 were issued September 4, 1998. The warrants expire two
       years from the date of issuance.

       The Company issued warrants to purchase 128,000 shares of common stock to
       a company for corporate finance services for a period of one year
       commencing April 15, 1998. The warrants are exercisable at $1.25 per
       share anytime after April 15, 1999 and expire April 15, 2000. The
       estimated fair value of the warrants issued of $16,500 was charged to
       expense during the period from January 26, 1998 (inception) to December
       31, 1998. In September 1998, the Company agreed to issue warrants to
       purchase 75,200 shares of common stock to the same company in connection
       with the placement of units in the September 1998 unit offering. The
       warrants are exercisable at a price of $3.58 per share and expire
       September 4, 2000.

       The Company issued warrants to purchase 90,000 shares of common stock to
       SMS Operating, LLC as partial consideration for a lease acquisition. The
       warrants are exercisable at $4.72 per share anytime after November 24,
       1998 and expire November 24, 2002. The estimated fair value of the
       warrants issued of $232,202 was capitalized as lease acquisition cost.

    (c) STOCK OPTION AND INCENTIVE PLAN

       On March 24, 1998, the Company adopted the 1998 Stock Option and
       Incentive Plan (the Plan). The aggregate number of shares which may be
       issued as awards under the Plan is 4,500,000 shares. As of December 31,
       1998, options to purchase common stock have been granted to key employees
       and directors at exercise prices ranging from $1.25 to $5.00 per share.

       Stock option activity for the Plan for the period from inception to
       December 31, 1998 is as follows:

<TABLE>
<CAPTION>
                                                                                              WEIGHTED
                                                                                               AVERAGE
                                                                                              EXERCISE
                                                                                 NUMBER OF      PRICE
                                                                                  OPTIONS     PER SHARE
                                                                                 ----------  -----------
<S>                                                                              <C>         <C>
BALANCE, JANUARY 26, 1998 (INCEPTION)                                                --       $  --
  Granted......................................................................   2,969,365        2.71
  Canceled.....................................................................    (204,000)       1.27
                                                                                 ----------
BALANCE, DECEMBER 31, 1998.....................................................   2,765,365        2.82
                                                                                 ----------
                                                                                 ----------
</TABLE>

                                      F-12
<PAGE>
                              PENNACO ENERGY, INC.

                         (A DEVELOPMENT STAGE COMPANY)

                               DECEMBER 31, 1998

                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)

(5) STOCKHOLDERS' EQUITY (CONTINUED)
       A summary of the range of exercise prices and the weighted-average
       contractual life of outstanding stock options at December 31, 1998, is as
       follows:

<TABLE>
<CAPTION>
                                        NUMBER      WEIGHTED       WEIGHTED         NUMBER      WEIGHTED
                                     OUTSTANDING     AVERAGE        AVERAGE      EXCERCISABLE    AVERAGE
                                     DECEMBER 31,   EXERCISE       REMAINING     DECEMBER 31,   EXERCISE
                                         1998         PRICE      LIFE (YEARS)        1998         PRICE
                                     ------------  -----------  ---------------  ------------  -----------
<S>                                  <C>           <C>          <C>              <C>           <C>
$      1.25                              800,000         1.25            9.3         612,500         1.25
       2.50                              914,000         2.50            8.4           4,000         2.50
       3.25                              430,000         3.25            4.6          --           --
       3.63                                1,215         3.63            4.0          --           --
       4.56                               12,150         4.56            3.8          --           --
       5.00                              608,000         5.00            4.2          --           --
                                     ------------                                ------------
$1.25 - 5.00                           2,765,365         2.81            7.1         616,500         1.24
                                     ------------                                ------------
                                     ------------                                ------------
</TABLE>

       The Company applies APB Opinion 25 and related interpretations in
       accounting for its stock option plans. No compensation expense has been
       recognized for options granted at or above market value at date of grant.
       Compensation expense of $1,340,000 has been recorded for the period from
       inception to December 31, 1998 for options granted below the market
       value, based upon the difference between the option price and the quoted
       market price at the date of grant.

       Had compensation cost for the Company's stock-based compensation plans
       been determined based upon the fair value of options on the grant dates,
       consistent with the provisions of SFAS 123, the Company's pro forma net
       loss and loss per share for the period from January 26, 1998 (inception)
       to December 31, 1998 would have been $6,447,183 and $.57, respectively.

       The weighted average fair value of options granted during 1998 was $1.34
       per share. The weighted average remaining contractual life of all options
       outstanding at December 31, 1998 was approximately 7.1 years. The fair
       value of each option grant was estimated at the date of grant using the
       Black-Scholes option-pricing model with the following assumptions: no
       expected dividends, expected life of the options of 1 to 10 years,
       volatility of 72%, and a risk-free interest rate of 5.5%.

(6) RELATED PARTY TRANSACTIONS

    RIS Resources International Corporation (RIS International) owned 4,000,000
    shares of the Company's common stock at December 31, 1998. A member of the
    Board of Directors of the Company also serves as a consultant to RIS
    International. From April 1, 1998 through June 22, 1998 he served as an
    officer of the Company. Since that time he has consulted with the Company
    and has received approximately $5,700 as compensation for his services.

    During the period from inception to December 31, 1998, a company for which
    the Company's Chairman serves as a director provided administrative services
    for the Company for which it received

                                      F-13
<PAGE>
                              PENNACO ENERGY, INC.

                         (A DEVELOPMENT STAGE COMPANY)

                               DECEMBER 31, 1998

                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)

(6) RELATED PARTY TRANSACTIONS (CONTINUED)
    compensation of approximately $16,000. In addition the Chairman was paid
    approximately $150,000 for the period from January 26, 1998 (inception) to
    December 31, 1998.

    One of the Company's Directors provided legal services to the Company during
    the period from inception to December 31, 1998. The Director's firm was paid
    approximately $192,000 and the Director was paid approximately $22,500 for
    the period from inception to December 31, 1998.

(7) COMMITMENTS

    (a) EMPLOYMENT AGREEMENTS

       The Company has entered into four-year employment agreements with two
       officers, its President and its Chief Financial Officer and Executive
       Vice President. Under the terms of the agreement with the President, if
       employment is terminated without cause prior to June 1, 1999, the
       President is entitled to termination compensation of $2,000,000, or
       $3,000,000 if he is terminated without cause after June 1, 1999 but
       before the expiration of his employment agreement in June 2002. Under
       terms of the agreement with the Executive Vice President and Chief
       Financial Officer, if employment is terminated without cause prior to
       July 1, 1999, the Chief Financial Officer and Executive Vice President is
       entitled to termination compensation of $400,000, $750,000 if he is
       terminated without cause after July 1, 1999 but before July 1, 2000 and
       $1,250,000 if he is terminated without cause thereafter but prior to the
       expiration of his employment agreement.

    (b) LEASE COMMITMENTS

       The Company entered into an amendment to its office lease agreement in
       Denver, Colorado effective June 1, 1998. The amended lease covers 11,524
       square feet for a term of two years and four months. During the term of
       the lease, rent is payable in the amount of $172,860 base rent per year.
       During the seven months of the lease from June 1, 1998 through December
       31, 1998, the Company paid $100,835 in rent.

       The company also leases office and lodging space in Gillette, Wyoming.
       The term of the lease commenced on October 5, 1998 and expires on April
       4, 1999. The lease concerns approximately 9,000 square feet at a yearly
       rent of approximately $17,400. In February 1999 a new lease/ purchase
       agreement was entered into. The term of the lease/purchase agreement
       commences on April 4, 1999 and expires December 31, 2000. The yearly rent
       during that term is approximately $17,400. Under the terms of the
       purchase option, $1,000 per month of the rent is deemed to apply to a
       purchase option on the property. The purchase option expires January 7,
       2001.

                                      F-14
<PAGE>
                              PENNACO ENERGY, INC.

                         (A DEVELOPMENT STAGE COMPANY)

                               DECEMBER 31, 1998

                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)

(8) SUPPLEMENTAL FINANCIAL DATA--OIL AND GAS ACTIVITIES

    Capitalized costs related to oil and gas activities are as follows:

<TABLE>
<CAPTION>
                                                                                            DECEMBER 31
                                                                                                1998
                                                                                            ------------
<S>                                                                                         <C>
Unproved oil and gas properties, at cost..................................................   $4,656,965
Proved oil and gas properties.............................................................    1,358,769
                                                                                            ------------
    Capitalized costs.....................................................................   $6,015,734
                                                                                            ------------
                                                                                            ------------
</TABLE>

    Costs incurred in oil and gas activities for the period from January 26,
    1998 (inception) to December 31, 1998 are as follows:

<TABLE>
<S>                                                                      <C>
Unproved property acquisition costs....................................  $18,132,430
Development costs......................................................     734,852
Exploration costs......................................................   1,860,804
                                                                         ----------
    Total costs incurred...............................................  $20,728,086
                                                                         ----------
                                                                         ----------
</TABLE>

    Unproved property acquisition costs include costs incurred to purchase,
    lease or otherwise acquire a property. Exploration costs include the costs
    of geological and geophysical activity, dry holes, delay rentals, and
    drilling and equipping exploratory wells. Development costs include costs
    incurred to gain access to and prepare development well locations for
    drilling, and to drill and equip development wells.

(9) INFORMATION REGARDING PROVED OIL AND GAS RESERVES (UNAUDITED)

        PROVED OIL AND GAS RESERVES.  Proved oil and gas reserves are the
    estimated quantities of crude oil, natural gas, and natural gas liquids
    which geological and engineering data demonstrate with reasonable certainty
    to be recoverable in future years from known reservoirs under existing
    economic and operating conditions, i.e., prices and costs as of the date the
    estimate is made. Prices include consideration of changes in existing prices
    provided only by contractual arrangements, but not on escalations based upon
    future conditions.

    The table below sets forth the Company's quantities of historical proved
    reserves as estimated by independent petroleum engineers, all of which were
    located in the United States, and the present values attributed to those
    reserves. The estimates were prepared by the independent petroleum
    engineering firm of Ryder Scott Company. Reserve estimates are inherently
    imprecise and are

                                      F-15
<PAGE>
                              PENNACO ENERGY, INC.

                         (A DEVELOPMENT STAGE COMPANY)

                               DECEMBER 31, 1998

                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)

(9) INFORMATION REGARDING PROVED OIL AND GAS RESERVES (UNAUDITED) (CONTINUED)
    continually subject to revisions based on production history, results of
    additional exploration and development, prices of oil and gas and other
    factors.

<TABLE>
<CAPTION>
                                                                                         DECEMBER 31, 1998
                                                                                                GAS
                                                                                               (BCF)
                                                                                       ---------------------
<S>                                                                                    <C>
Proved developed and undeveloped reserves:
Balance at January 26, 1998 (inception)..............................................           --
Extensions and discoveries...........................................................             18.1
                                                                                                   ---
Balance at December 31, 1998.........................................................             18.1
                                                                                                   ---
                                                                                                   ---
Proved developed reserves:
Balance at January 26, 1998 (inception)..............................................           --
                                                                                                   ---
                                                                                                   ---
Balance at December 31, 1998.........................................................              5.5
                                                                                                   ---
                                                                                                   ---
</TABLE>

    Standardize Measure of Discounted Future Net Cash Flows

    Future net cash flows presented below are computed using year-end prices and
    costs. Future corporate overhead expenses and interest expense have not been
    included.

<TABLE>
<CAPTION>
                                                                                       DECEMBER 31, 1998
                                                                                       -----------------
                                                                                        (IN THOUSANDS)
<S>                                                                                    <C>
Future cash inflows, net of production taxes.........................................      $  20,250
Future production costs..............................................................         (6,831)
Future development costs.............................................................         (1,422)
Future income tax expenses...........................................................         (3,468)
                                                                                             -------
Future net cash flows................................................................          8,529
                                                                                             -------
10% annual discount for estimated timing of cash flows...............................         (2,387)
                                                                                             -------
Standardized measure of discounted future net cash flows.............................      $   6,142
                                                                                             -------
                                                                                             -------
</TABLE>

                                      F-16
<PAGE>
                              PENNACO ENERGY, INC.

                         (A DEVELOPMENT STAGE COMPANY)

                               DECEMBER 31, 1998

                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)

(9) INFORMATION REGARDING PROVED OIL AND GAS RESERVES (UNAUDITED) (CONTINUED)
    The principal sources of changes in the standardized measure of discounted
    future net cash flows, are as follows:

<TABLE>
<CAPTION>
                                                                                         PERIOD FROM
                                                                                      JANUARY 26, 1998
                                                                                         (INCEPTION)
                                                                                       TO DECEMBER 31,
                                                                                            1998
                                                                                     -------------------
                                                                                       (IN THOUSANDS)
<S>                                                                                  <C>
Net change due to extensions and discoveries.......................................       $   8,528
Net change in income taxes.........................................................          (2,386)
                                                                                           --------
Net changes........................................................................           6,142
Balance at January 26, 1998 (inception)............................................          --
                                                                                           --------
Balance at December 31, 1998.......................................................       $   6,142
                                                                                           --------
                                                                                           --------
</TABLE>

    The standardized measure of discounted future net cash flows relating to
    proved oil and gas reserves and the changes in standardized measure of
    discounted future net cash flows relating to proved oil and gas reserves
    were prepared in accordance with the provisions of Statement of Financial
    Accounting Standards No. 69. Future cash inflows were computed by applying
    current prices at year-end to estimated future production. Future production
    and development costs are computed by estimating the expenditures to be
    incurred in developing and producing the proved oil and gas reserves at
    year-end, based on year-end costs and assuming continuation of existing
    economic conditions. Future income tax expenses are calculated by applying
    appropriate year-end tax rates to future pretax net cash flows relating to
    proved oil and gas reserves, less the tax basis of properties involved and
    tax credits and loss carryforwards relating to oil and gas producing
    activities. Future net cash flows are discounted at a rate of 10% annually
    to derive the standardized measure of discounted future net cash flows. This
    calculation procedure does not necessarily result in an estimate of the fair
    market value or the present value of the Company's oil and gas properties.

                                      F-17
<PAGE>
                              PENNACO ENERGY, INC.

                         (A DEVELOPMENT STAGE COMPANY)

                                 BALANCE SHEET

                                  (UNAUDITED)

<TABLE>
<CAPTION>
                                                                                MARCH 31, 1999  DECEMBER 31, 1998
                                                                                --------------  -----------------
<S>                                                                             <C>             <C>
Current assets:
  Cash........................................................................   $ 10,428,937         5,622,776
  Accounts receivable.........................................................        341,107           374,728
  Subscriptions receivable....................................................        --                763,750
  Assets held for sale........................................................        611,706         6,931,995
  Drilling deposit............................................................        533,684           333,473
  Inventory...................................................................        812,574           231,116
  Prepaid expenses and other current assets...................................        115,506           151,858
                                                                                --------------  -----------------
    Total current assets......................................................     12,843,514        14,409,696
                                                                                --------------  -----------------

Property and equipment, at cost:
  Oil and gas properties, using the successful efforts method of accounting
    (note 2):
  Unproved....................................................................      5,442,904         4,656,965
  Proved......................................................................      6,195,692         1,358,769
  Other property and equipment................................................        371,706           296,119
                                                                                --------------  -----------------
                                                                                   12,010,302         6,311,853
  Less accumulated depreciation...............................................        (91,630)          (61,607)
                                                                                --------------  -----------------

  Net property and equipment..................................................     11,918,672         6,250,246
                                                                                --------------  -----------------
Deferred income tax asset.....................................................        177,000         1,266,000
Other assets..................................................................         99,795            99,795
                                                                                --------------  -----------------
                                                                                   25,038,981        22,025,737
                                                                                --------------  -----------------
                                                                                --------------  -----------------

Current liabilities:
  Bridge loan payable (note 3)................................................        --              5,600,000
  Lease acquisitions payable..................................................        152,110           618,586
  Accounts payable and accrued liabilities....................................      1,235,607         1,964,228
  Income taxes payable........................................................      2,827,000          --
                                                                                --------------  -----------------
    Total current liabilities.................................................      4,214,717         8,182,814
                                                                                --------------  -----------------

Stockholders' equity (note 4):
  Common stock, $.001 par value. Authorized 50,000,000 shares; Issued and
    outstanding 15,144,179 shares at March 31, 1999 and 14,795,179 at December
    31, 1998..................................................................         15,144            15,152
  Additional paid-in capital..................................................     17,970,063        17,640,644
  Retained earnings (deficit) accumulated during the development stage........      2,839,057        (3,812,873)
                                                                                --------------  -----------------
    Total stockholders' equity................................................     20,824,264        13,842,923
                                                                                --------------  -----------------
Commitments...................................................................        --               --
                                                                                   25,038,981        22,025,737
                                                                                --------------  -----------------
                                                                                --------------  -----------------
</TABLE>

                See accompanying notes to financial statements.

                                      F-18
<PAGE>
                              PENNACO ENERGY, INC.

                         (A DEVELOPMENT STAGE COMPANY)

                            STATEMENT OF OPERATIONS

                                  (UNAUDITED)

<TABLE>
<CAPTION>
                                                                                  PERIOD FROM      CUMULATIVE
                                                                                  JANUARY 26,      JANUARY 26,
                                                                                     1998             1998
                                                           THREE MONTHS ENDED   (INCEPTION) TO   (INCEPTION) TO
                                                             MARCH 31, 1999     MARCH 31, 1998   MARCH 31, 1999
                                                           -------------------  ---------------  ---------------
<S>                                                        <C>                  <C>              <C>
Revenue:
  Interest income........................................    $       109,403              458           164,689
                                                           -------------------  ---------------  ---------------
  Total revenue..........................................            109,403              458           164,689

Expenses:
  Exploration............................................             51,590            4,859         1,877,357
  Depreciation and amortization..........................             30,023              485            91,630
  General and administrative.............................          1,044,787           58,157         5,022,379
  Interest expense.......................................          --                 --                682,400
                                                           -------------------  ---------------  ---------------
  Total expenses.........................................          1,126,400           63,501         7,673,766

Gain on sale of properties...............................         11,945,557          --             13,358,764
                                                           -------------------  ---------------  ---------------

Income (loss) before income taxes........................         10,928,560          (63,043)        5,849,687

Income tax expense.......................................         (3,916,000)         --             (2,650,000)
                                                           -------------------  ---------------  ---------------

Net income (loss)........................................    $     7,012,560          (63,043)        3,199,687
                                                           -------------------  ---------------  ---------------
                                                           -------------------  ---------------  ---------------

Basic income (loss) per share............................    $           .47            (0.01)
                                                           -------------------  ---------------
                                                           -------------------  ---------------

Diluted income (loss) per share..........................    $           .44            (0.01)
                                                           -------------------  ---------------
                                                           -------------------  ---------------

Weighted average common shares outstanding-- basic.......         14,943,512        4,348,333
                                                           -------------------  ---------------
                                                           -------------------  ---------------

Weighted average common shares outstanding-- diluted.....         16,081,739        4,348,333
                                                           -------------------  ---------------
                                                           -------------------  ---------------
</TABLE>

                See accompanying notes to financial statements.

                                      F-19
<PAGE>
                              PENNACO ENERGY, INC.

                         (A DEVELOPMENT STAGE COMPANY)

                            STATEMENT OF CASH FLOWS

                                  (UNAUDITED)

<TABLE>
<CAPTION>
                                                                                  PERIOD FROM      CUMULATIVE
                                                                                  JANUARY 26,      JANUARY 26,
                                                                 THREE MONTHS        1998             1998
                                                                    ENDED       (INCEPTION) TO   (INCEPTION) TO
                                                                MARCH 31, 1999  MARCH 31, 1998   MARCH 31, 1999
                                                                --------------  ---------------  ---------------
<S>                                                             <C>             <C>              <C>
Cash flows from operating activities:
  Net income (loss)...........................................   $  7,012,560         (63,043)        3,199,687
  Adjustments to reconcile net loss to net cash used in
    operating activities:
    Gain on sale of properties................................    (11,945,557)        --            (13,358,764)
    Depreciation and amortization.............................         30,023             485            91,630
    Compensation relating to common stock and warrants
      issued..................................................        --              --              1,340,000
    Stock option compensation.................................         10,870         --                460,870
    Warrants issued for services..............................        --              --                 16,500
    Income taxes payable......................................      2,827,000         --              2,827,000
    Deferred income tax expense (benefit).....................      1,089,000         --               (177,000)
    Changes in operating assets and liabilities:
      (Increase) decrease in accounts receivable..............         33,621         --               (341,107)
      Increase in inventory...................................       (581,458)        --               (812,574)
      (Increase) decrease in prepaid expenses and other
        current assets........................................         36,352         --               (115,506)
      Increase in other assets................................        --              --                (99,795)
      Increase (decrease)in accounts payable and accrued
        liabilities...........................................       (728,621)         66,283         1,235,607
                                                                --------------  ---------------  ---------------
        Net cash provided (used) by operating activities......     (2,216,210)          3,725        (5,733,452)

Cash flows form investing activities:
  Capital expenditures........................................     (6,657,370)     (9,712,173)      (25,855,809)
  Proceeds from sale of properties............................     19,224,767         --             26,824,767
  Drilling deposit, net.......................................       (200,211)        --               (533,684)
  Increase (decrease) in lease acquisitions payable...........       (466,476)      8,826,368           152,110
                                                                --------------  ---------------  ---------------
        Net cash provided (used) by investing activities......     11,900,710        (885,805)          587,384
                                                                --------------  ---------------  ---------------
Cash flows from financing activities:
  Proceeds from issuance of bridge loans......................        --              --              8,800,000
  Repayment of bridge loan....................................     (5,600,000)        --             (8,800,000)
  Proceeds from issuance of note payable......................        --              --                500,000
  Repayment of note payable...................................        --              --               (500,000)
  Proceeds from issuance of common stock, net of offering
    costs.....................................................        721,661       2,065,497        15,575,005
                                                                --------------  ---------------  ---------------

        Net cash provided by financing activities.............     (4,878,339)      2,065,497        15,575,005

        Net increase in cash..................................      4,806,161       1,183,417        10,428,937

Cash at beginning of period...................................      5,622,776         --               --
                                                                --------------  ---------------  ---------------
Cash at end of period.........................................   $ 10,428,937       1,183,417        10,428,937
                                                                --------------  ---------------  ---------------
                                                                --------------  ---------------  ---------------

Supplemental disclosures of cash flow information:
  Cash paid for interest......................................        --              --          $     682,400
                                                                --------------  ---------------  ---------------
                                                                --------------  ---------------  ---------------

  Cash paid for income taxes..................................        --              --               --
                                                                --------------  ---------------  ---------------
                                                                --------------  ---------------  ---------------
</TABLE>

                See accompanying notes to financial statements.

                                      F-20
<PAGE>
                              PENNACO ENERGY, INC.

                         (A DEVELOPMENT STAGE COMPANY)

                                 MARCH 31, 1999

                         NOTES TO FINANCIAL STATEMENTS

                                  (UNAUDITED)

(1) ORGANIZATION AND BASIS OF PRESENTATION

    Pennaco Energy, Inc. (the "Company") is an independent exploration and
    production company primarily engaged in the acquisition and development of
    natural gas production from coal bed methane properties in the Rocky
    Mountain region of the United States. The Company was incorporated on
    January 26, 1998 under the laws of the state of Nevada and its headquarters
    are in Denver, Colorado.

    The Company's activities to date have been limited to organizational
    activities, prospect development activities, acquisition of leases and
    option rights, and commencement of its drilling program. The Company
    currently has oil and gas lease rights in the Powder River Basin in
    northeastern Wyoming and southeastern Montana. As of March 31, 1999 the
    Company had no revenue producing operations. Accordingly, the Company is
    considered to be in the development stage.

    The Company was incorporated as a wholly-owned subsidiary of International
    Metal Protection Inc. ("International Metal"). Subsequently, all of the
    outstanding shares of International Metal were exchanged for shares of the
    Company and International Metal was merged into the Company. The 995,000
    shares issued in the exchange were recorded at their par value of $.001 per
    share as International Metal had no assets or liabilities at the date of the
    merger. International Metal and its predecessor, AKA Video Communications
    Inc., had been inactive for the two years ended December 31, 1997 and prior
    thereto.

    In the opinion of management the accompanying financial statements reflect
    all adjustments, consisting of normal recurring adjustments, necessary to
    present fairly the Company's financial position as of March 31, 1999, and
    the results of its operations for the three-month period ended March 31,
    1999 and the period from January 26, 1998 (inception) to March 31, 1998. The
    results of operations for interim periods are not necessarily indicative of
    the results of operations for the full fiscal year. The accounting policies
    followed by the Company are included in Note 1 to the Financial Statements
    in the Company's Annual Report on Form 10-KSB for the period from January
    26, 1998 (inception) to December 31, 1998. These financial statements should
    be read in conjunction with the Form 10-KSB.

(2) OIL AND GAS ACTIVITIES

    The Company follows the successful efforts method of accounting for its oil
    and gas activities. Accordingly, costs associated with the acquisition,
    drilling and equipping of successful exploratory wells are capitalized.
    Geological and geophysical costs, delay and surface rentals and drilling
    costs of unsuccessful exploratory wells are charged to expense as incurred.
    Costs of drilling development wells, both successful and unsuccessful, are
    capitalized. Upon the sale or retirement of oil and gas properties, the cost
    thereof and the accumulated depreciation and depletion are removed from the
    accounts and any gain or loss is credited or charged to operations. Upon the
    sale of a partial interest in an unproved property, the proceeds are treated
    as a recovery of cost. If the proceeds exceed the carrying amount of the
    property, a gain is recognized in operations. Depletion of capitalized
    acquisition, exploration and development costs is computed on the
    units-of-production method by individual fields as the related proved
    reserves are produced.

                                      F-21
<PAGE>
                              PENNACO ENERGY, INC.

                         (A DEVELOPMENT STAGE COMPANY)

                                 MARCH 31, 1999

                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)

                                  (UNAUDITED)

(2) OIL AND GAS ACTIVITIES (CONTINUED)
    Capitalized costs of unproved properties are assessed periodically and a
    provision for impairment is recorded, if necessary, through a charge to
    operations.

    Proved oil and gas properties are assessed for impairment on a
    field-by-field basis. If the net capitalized costs of proved oil and gas
    properties exceeds the estimated undiscounted future net cash flows from the
    property a provision for impairment is recorded to reduce the carrying value
    of the property to its estimated fair value.

(3) CMS TRANSACTION

    On October 23, 1998, the Company and CMS Oil and Gas Company signed a
    definitive agreement (the "CMS Agreement") relating to the development of
    the Company's Powder River Basin acreage (the "CMS Transaction"). Pursuant
    to the terms of the CMS Agreement, CMS Oil and Gas Company acquired an
    undivided 50% working interest in approximately 492,000 net acres of
    Pennaco's leasehold position in the Powder River Basin for $28,000,000. The
    Company acquired the leasehold position which was conveyed to CMS in the CMS
    Transaction for approximately $7,000,000. The purchase price provided for in
    the CMS Agreement was the result of arm's length negotiations between the
    Company and CMS. The joint operating agreement between the parties will be
    modeled after the 1989 AAPL Model Form of Joint Operating Agreement. The CMS
    Agreement provides that the parties will in good faith negotiate a
    development agreement for the exploration, development and production of
    coal bed methane from the leases. The development agreement will provide
    that each party will operate approximately 50% of the wells drilled in the
    area of mutual interest. Pennaco and CMS have divided the acreage in the
    area of mutual interest into project areas which will be operated by one
    party or the other. As is customary in oil and gas leasehold transactions,
    the agreement provides for the adjustment of the purchase price for title
    defects discovered prior to closing and for the opportunity for one party to
    participate in acquisitions made by the other party in the area of mutual
    interest defined in the agreement. The agreement also provides for a
    preferential purchase right to the other party in the event either CMS or
    the Company attempts to sell a portion of its interest in the acreage
    covered by the agreement. There is no preferential purchase right in the
    event that either party enters into a merger, reorganization or
    consolidation. All of the leases in the area of mutual interest are
    dedicated to CMS Gas Transmission and Storage, an affiliate of CMS Oil and
    Gas Company, for gathering, compression and transportation. Pursuant to the
    terms of the CMS Agreement, CMS agreed to pay Pennaco $5,600,000 of earnest
    money in the form of a non-interest bearing bridge loan (the "CMS Bridge
    Loan") which was secured by substantially all of the Company's oil and as
    leases. Approximately $3,200,000 of such amount was paid directly to
    existing creditors of the Company. The CMS Transaction was structured such
    that the conveyance of the working interests was to occur at two separate
    closings. The first closing occurred on November 20, 1998, and the second
    occurred on January 15, 1999. The Company received $7,600,000 at the first
    closing and received $14,800,000 at the second closing, less approximately
    $1,800,000 which was held in escrow subject to customary closing
    adjustments. As of March 31, 1999, approximately $1,200,000 was held in
    escrow pending CMS closing adjustments. The CMS Bridge Loan was canceled at
    the second closing. Under the terms of the CMS Agreement, CMS will pay the
    Company for its share of

                                      F-22
<PAGE>
                              PENNACO ENERGY, INC.

                         (A DEVELOPMENT STAGE COMPANY)

                                 MARCH 31, 1999

                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)

                                  (UNAUDITED)

(3) CMS TRANSACTION (CONTINUED)
    the costs of acquiring any acreage in excess of the original 492,000 net
    acres. The joint venture acreage in the area of mutual interest is
    approximately 560,000 net acres as of January 15, 1999.

    In the accompanying financial statements, the proceeds are treated as a
    recovery of cost of the properties. A gain was recognized to the extent the
    proceeds exceeded the carrying amount of the properties.

(4) STOCKHOLDERS' EQUITY

    In September 1998, the Company issued 980,000 units at $3.25 per unit. Each
    unit consists of one share of common stock and one warrant for each two
    shares issued. The warrants with an exercise price of $5.00 per share expire
    on March 4, 1999. Proceeds to the Company were approximately $3,165,000.
    Offering costs of $324,675 were charged to additional paid-in capital.

    Under the terms of the Company's September 1998 stock subscription
    agreement, 235,000 units were placed in an escrow account. Subscription
    payments of $763,750 were deposited into an escrow account representing the
    aggregate purchase price of 235,000 units. Under the terms of the escrow
    agreement the shares and the shares of common stock underlying the warrants
    were to be registered for resale under the Securities Act of 1933 (the
    "Act") with the Securities and Exchange Commission by December 31, 1998. The
    Company has also undertaken to have the shares qualified by way of an
    exemption order provided by the respective Securities Commissions in Canada.

    The escrow proceeds of $763,750 were deposited into an interest bearing
    escrow account together with certificates representing the units to be
    purchased. Under the terms of the subscription agreement, the registration
    statement was required to be declared effective and the Canadian exemption
    order was to be obtained on or before December 31, 1998. The registration
    statement was not declared effective by this date. Accordingly, as of
    December 31, 1998, the subscriber was entitled to elect to either purchase
    the escrow units or receive a refund from the escrow account paid with their
    subscription plus interest thereon, and an additional unit for each 10 units
    purchased in the offering. On February 28, 1999, virtually all of the
    subscribers elected to purchase the escrow shares and all subscribers
    received an additional unit for each 10 units purchased in the offering. As
    a result, an additional 120,250 units were issued. These 120,250 units have
    been reflected in the accompanying financial statements as an addition to
    paid-in capital of $360,630 and as a reduction to retained earnings of the
    same amount. Additionally, 222,500 units were issued from escrow and
    proceeds of $723,125 were received by the Company from escrow. One
    subscriber elected not to purchase escrow shares and instead received a
    refund from escrow of $40,625 which represented 12,500 units, which were in
    turn not issued.

                                      F-23
<PAGE>
                              PENNACO ENERGY, INC.

                         (A DEVELOPMENT STAGE COMPANY)

                                 MARCH 31, 1999

                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)

                                  (UNAUDITED)

(5) EARNINGS PER SHARE

    The following table sets forth the computation of basic and diluted earnings
    per share:

<TABLE>
<CAPTION>
                                                                                PERIOD FROM
                                                                                JANUARY 26,
                                                               THREE MONTHS        1998
                                                                  ENDED       (INCEPTION) TO
                                                              MARCH 31, 1999  MARCH 31, 1998
                                                              --------------  ---------------
<S>                                                           <C>             <C>
Numerator for basic and diluted income (loss) per
  share--income (loss) available to common stockholders.....   $  7,012,560         (63,043)
                                                              --------------  ---------------

Denominator: Denominator for basic income (loss) per
  share--weighted average shares............................     14,943,512       4,348,333
  Effect of dilutive securities:
    Stock warrants..........................................        276,644         --
    Stock Options...........................................        861,583         --
                                                              --------------  ---------------
Denominator for diluted income (loss) per share--
  share--adjusted weighted average shares conversion........     16,081,739       4,348,333
                                                              --------------  ---------------
                                                              --------------  ---------------
Basic income (loss) per share...............................   $        .47           (0.01)
Diluted income (loss) per share.............................   $        .44           (0.01)
</TABLE>

    Potentially dilutive common shares attributable to outstanding options to
purchase common shares of 608,000 and 1,000,000 options were antidilutive for
the three months ended March 31, 1999 and the period from January 26, 1998
(inception) to March 31, 1998, respectively.

                                      F-24
<PAGE>
                              PENNACO ENERGY, INC.

                                3,296,165 SHARES
                                  COMMON STOCK

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

                              P R O S P E C T U S

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

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

We have not authorized any dealer, salesperson or other person to give you
written information other than this prospectus supplement and the prospectus or
to make representations as to matters not stated in this prospectus supplement
and the prospectus. You must not rely on unauthorized information. This
prospectus supplement and the prospectus are not an offer to sell these
securities or our solicitation of your offer to buy these securities in any
jurisdiction where that would not be permitted or legal. Neither the delivery of
this prospectus supplement or the prospectus nor any sales made hereunder after
the date of this prospectus supplement and the prospectus shall create an
implication that the information contained herein or the affairs of the company
have not changed since the date thereof.
- --------------------------------------------------------------------------------
<PAGE>
                                    PART II

                     INFORMATION NOT REQUIRED IN PROSPECTUS

ITEM 24.  INDEMNIFICATION OF DIRECTORS AND OFFICERS

    The Nevada Revised Statutes and certain provisions of the Company's Bylaws
under certain circumstances provide for indemnification of the Company's
officers, directors and controlling persons against liabilities that they may
incur in such capacities. A summary of the circumstances in which such
indemnification is provided for is contained herein, but this description is
qualified in its entirety by reference to the Company's Bylaws and to the
statutory provisions.

    In general, any officer, director, employee or agent may be indemnified
against expenses, fines, settlements or judgments arising in connection with a
legal proceeding to which such person is a party, if that person's actions were
in good faith, were believed to be in the Company's best interest, and were not
unlawful. Unless such person is successful upon the merits in such an action,
indemnification may be awarded only after a determination by independent
decision of the Board of Directors, by legal counsel, or by a vote of the
stockholders, that the applicable standard of conduct was met by the person to
be indemnified.

    The circumstances under which indemnification is granted in connection with
an action brought on behalf of the Company is generally the same as those set
forth above; however, with respect to such actions, indemnification is granted
only with respect to expenses actually incurred in connection with the defense
or settlement of the action. In such actions, the person to be indemnified must
have acted in good faith and in a manner believed to have been in the Company's
best interest, and must not have been adjudged liable for negligence or
misconduct.

    Indemnification may also be granted pursuant to the terms of agreements that
may be entered in the future or pursuant to a vote of stockholders or directors.
The statutory provision cited above also grants the power to the Company to
purchase and maintain insurance which protects its officers and directors
against any liabilities incurred in connection with their service in such a
position, and such a policy may be obtained by the Company.

ITEM 25.  OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION

    The expenses of the offering are estimated to be as follows:


<TABLE>
<S>                                                                  <C>
SEC Registration Fee...............................................  $   6,925
Printing Expenses..................................................      9,500
Legal Fees and Expenses............................................     25,000
Accounting Fees and Expenses.......................................      7,500
Transfer Agent Fees................................................        500
Miscellaneous......................................................      1,337
                                                                     ---------
  TOTAL............................................................  $  50,762
                                                                     ---------
                                                                     ---------
</TABLE>


ITEM 26.  RECENT SALES OF UNREGISTERED SECURITIES.

    Set forth below is certain information concerning all sales of securities by
the Company during the past three years that were not registered under the
Securities Act.

    (a) The Company issued 995,000 shares in January 1998 pursuant to a
share-for-share exchange with the stockholders of International Metal
Protection, Inc. in a transaction conducted solely to reincorporate the Company
in a new jurisdiction. This transaction was exempt from the registration
requirements of the

                                      II-1
<PAGE>
Securities Act pursuant to Section 4(2) of the Securities Act. There was no
change in ownership and the stockholders made no significant investment
decision.

    (b) The Company issued 500,000 shares in February 1998 for the purchase
price of $.10 per share pursuant to a private placement exempt from the
registration requirements of the Securities Act pursuant to Section 4(2) of the
Securities Act. At that time, the Company had only a business plan and no
assets. There were eleven offerees in this offering, all of whom made purchases
and all of whom were sophisticated investors. The Company fully apprised each of
the offerees of the Company's start-up nature and gave them full details
regarding the Company's business plan. There was no general solicitation or
advertising used in connection with the offer to sell or sale of these
securities. The purchasers were advised that the securities, once purchased,
could not be resold or otherwise transferred without subsequent registration
under the Securities Act. Each purchaser represented to the Company that they
were purchasing the securities for their own account for investment purposes
only.

    (c) The Company issued 4,530,000 shares in February 1998 for a purchase
price of $.22 per share pursuant to a Regulation D, Rule 504 offering. Offerees
were provided with a private placement memorandum containing detailed
information about the Company and its plan. The Company required each
prospective investor to represent in writing that (i) they had adequate means of
providing for their current needs and personal contingencies and had no need to
sell the securities in the foreseeable future and (ii) they, either alone or
with their duly designated purchaser representative, had such knowledge and
experience in business and financial matters that they were capable of
evaluating the risks and merits of an investment in the securities.

    (d) The Company issued 5,000,000 shares in April 1998 for a purchase price
of $1.25 per share pursuant to a Regulation D, Rule 506 offering. The Company
accepted subscriptions only from accredited investors. Offerees were provided
with a private placement memorandum containing detailed information about the
Company and its plan. The Company required each prospective investor to
represent in writing that (i) they had received and reviewed the private
placement memorandum and understood the risks of an investment in the Company;
(ii) they had the experience and knowledge with respect to similar investments
which enabled them to evaluate the merits and risks of such investment, or they
had obtained and relied upon an experienced independent adviser with respect to
such evaluation; (iii) they had adequate means to bear the economic risk of such
investment, including the loss of the entire investment; (iv) they had adequate
means to provide for their current needs and possible personal contingencies;
(v) they had no need for liquidity of their investment in the Company; (vi) they
understood that the securities had not been registered under the Securities Act
and may have not been registered or qualified under applicable state securities
laws and, therefore, that they could not sell or transfer the securities unless
the securities were subsequently registered or an exemption therefrom was
available to them; (vii) they were acquiring the securities for investment
solely for their own account and without any intention of reselling or
distributing them; and (viii) they understood that the securities would bear a
restrictive legend prohibiting transfers except in compliance with the
provisions of the securities, the subscription agreement executed by the
purchaser and the applicable federal and state securities laws.

    (e) The Company issued 128,000 share purchase warrants with an exercise
price of $1.25 per share, exercisable after April 15, 1999, to Yorkton in April
1998 pursuant to a private placement exemption from the registration
requirements of the Securities Act under Section 4(2) of the Securities Act.
These warrants were issued pursuant to a negotiated transaction between the
Company and Yorkton, whereby Yorkton agreed to provide corporate finance
services to the Company for one year in return for these warrants.

    (f) The Company issued 2,000,000 shares in June 1998 to RIS pursuant to a
Regulation D, Rule 506 offering for a purchase price of $1.75 per share. The
Company accepted subscriptions only from accredited investors. Offerees were
provided with a private placement memorandum containing detailed information
about the Company and its plan. The Company required each prospective investor
to represent in writing that (i) they had received and reviewed the private
placement memorandum and understood the risks of an

                                      II-2
<PAGE>
investment in the Company; (ii) they had the experience and knowledge with
respect to similar investments which enabled them to evaluate the merits and
risks of such investment, or they had obtained and relied upon an experienced
independent adviser with respect to such evaluation; (iii) they had adequate
means to bear the economic risk of such investment, including the loss of the
entire investment; (iv) they had adequate means to provide for their current
needs and possible personal contingencies; (v) they had no need for liquidity of
their investment in the Company; (vi) they understood that the securities had
not been registered under the Securities Act and may have not been registered or
qualified under applicable state securities laws and, therefore, that they could
not sell or transfer the securities unless the securities were subsequently
registered or an exemption therefrom was available to them; (vii) they were
acquiring the securities for investment solely for their own account and without
any intention of reselling or distributing them; and (viii) they understood that
the securities would bear a restrictive legend prohibiting transfers except in
compliance with the provisions of the securities, the subscription agreement
executed by the purchaser and the applicable federal and state securities laws.

    (g) The Company issued 796,429 units in June, July and September 1998
pursuant to a Regulation D, Rule 506 offering to three members of the management
team of the Company, for a purchase price of $1.75 per unit, each unit
consisting of one share and a one share purchase warrant for every two shares
purchased. All units were purchased by three members of the management team of
the Company. Offerees were provided with a private placement memorandum
containing detailed information about the Company and its plan. The Company
required each prospective investor to represent in writing that (i) they had
received and reviewed the private placement memorandum and understood the risks
of an investment in the Company; (ii) they had the experience and knowledge with
respect to similar investments which enabled them to evaluate the merits and
risks of such investment, or they had obtained and relied upon an experienced
independent adviser with respect to such evaluation; (iii) they had adequate
means to bear the economic risk of such investment, including the loss of the
entire investment; (iv) they had adequate means to provide for their current
needs and possible personal contingencies; (v) they had no need for liquidity of
their investment in the Company; (vi) they understood that the securities had
not been registered under the Securities Act and may have not been registered or
qualified under applicable state securities laws and, therefore, that they could
not sell or transfer the securities unless the securities were subsequently
registered or an exemption therefrom was available to them; (vii) they were
acquiring the securities for investment solely for their own account and without
any intention of reselling or distributing them; and (viii) they understood that
the securities would bear a restrictive legend prohibiting transfers except in
compliance with the provisions of the securities, the subscription agreement
executed by the purchaser and the applicable federal and state securities laws.

    (h) The Company issued 1,215,000 units on September 4, 1998 pursuant to a
Regulation D, Rule 506 offering for a purchase price of $3.25 per unit, each
unit consisting of one share and a one share purchase warrant for every two
shares purchased. The Company accepted subscriptions only from accredited
investors. Offerees were provided with a private placement memorandum containing
detailed information about the Company and its plan. The Company required each
prospective investor to represent in writing that (i) they had received and
reviewed the private placement memorandum and understood the risks of an
investment in the Company; (ii) they had the experience and knowledge with
respect to similar investments which enabled them to evaluate the merits and
risks of such investment, or they had obtained and relied upon an experienced
independent adviser with respect to such evaluation; (iii) they had adequate
means to bear the economic risk of such investment, including the loss of the
entire investment; (iv) they had adequate means to provide for their current
needs and possible personal contingencies; (v) they had no need for liquidity of
their investment in the Company; (vi) they understood that the securities had
not been registered under the Securities Act and may have not been registered or
qualified under applicable state securities laws and, therefore, that they could
not sell or transfer the securities unless the securities were subsequently
registered or an exemption therefrom was available to them; (vii) they were
acquiring the securities for investment solely for their own account and without
any intention of reselling or distributing them; and (viii) they understood that
the securities would bear a restrictive legend prohibiting transfers

                                      II-3
<PAGE>
except in compliance with the provisions of the securities, the subscription
agreement executed by the purchaser and the applicable federal and state
securities laws. Yorkton served as placement agent for this private placement.
As compensation, Yorkton received share purchase warrants to purchase 75,200
shares at an exercise price of $3.58. These share purchase warrants were issued
pursuant to the same Regulation D, Rule 506 offering.

ITEM 27.  EXHIBITS.

<TABLE>
<CAPTION>
EXHIBIT
 NO.   TITLE
- ------ --------------------------------------------------------------------------
<C>    <S>
  3.1  Articles of Incorporation (filed as Exhibit 3.1 to the Company's Form
         10-SB File No. 00-24881, filed September 15, 1998 and included herein by
         reference).
  3.2  Bylaws (filed as Exhibit 3.2 to the Company's Form 10-SB, File No.
         00-24881, filed September 15, 1998 and included herein by reference).
 +4.1  Form of Warrant
 +5.1  Opinion of Gibson, Haglund & Johnson
 10.1  Mineral Lease Purchase Agreement dated February 23, 1998 between High
         Plains Associates, Inc. and Pennaco Energy, Inc. (filed as Exhibit 10.1
         to the Company's Form 10-SB/A File No. 00-24881, filed September 15,
         1998 and included herein by reference).
 10.2  Letter Agreement dated January 23, 1998 between High Plains Associates,
         Inc. and Taylor Oil Properties (filed as Exhibit 10.2 to the Company's
         Form 10-SB/A File No. 00-24881, filed September 15, 1998 and included
         herein by reference).
 10.3  Assignment of Option and Exercise of Option dated March 6, 1998 between
         High Plains Associates, Inc. and Pennaco Energy, Inc. (filed as Exhibit
         10.3 to the Company's Form 10-SB/A File No. 00-24881, filed September
         15, 1998 and included herein by reference).
 10.4  Agreement dated March 6, 1998 between High Plains Associates, Inc. and
         Pennaco Energy, Inc. (filed as Exhinbit 10.4 to the Company's Form
         10-SB/A File No. 00-24881, filed September 15, 1998 and included herein
         by reference).
 10.5  Pennaco Energy, Inc. 1998 Stock Option and Incentive Plan (filed as
         Exhibit 10.5 to the Company's Form 10-SB, File No. 00-24881, filed
         September 15, 1998 and included herein by reference).
 10.6  Form of Pennaco Energy, Inc. Incentive Stock Option Agreement (filed as
         Exhibit 10.6 to the Company's Form 10-SB, File No. 00-24881, filed
         September 15, 1998 and included herein by reference).
 10.7  Form of Pennaco Energy, Inc. Non-Statutory Stock Option Agreement (filed
         as Exhibit 10.7 to the Company's Form 10-SB, File No. 00-24881, filed
         September 15, 1998 and included herein by reference).
 10.8  Employment Agreement dated June 10, 1998 between Pennaco Energy, Inc. and
         Paul M. Rady (filed as Exhibit 10.8 to the Company's Form 10-SB, File
         No. 00-24881, filed September 15, 1998 and included herein by
         reference).
 10.9  Employment Agreement dated July 2, 1998 between Pennaco Energy, Inc. and
         Glen C. Warren, Jr. (filed as Exhibit 10.9 to the Company's Form 10-SB,
         File No. 00-24881, filed September 15, 1998 and included herein by
         reference).
 10.10 Secured Promissory Note dated August 13, 1998 from Pennaco Energy, Inc. to
         Venture Capital Sourcing, SA (filed as Exhibit 10.10 to the Company's
         Form 10-SB/A File No. 00-24881, filed September 15, 1998 and included
         herein by reference).
</TABLE>

                                      II-4
<PAGE>

<TABLE>
<CAPTION>
EXHIBIT
 NO.   TITLE
- ------ --------------------------------------------------------------------------
<C>    <S>
 10.11 Second Amendment to Security Agreement dated August 13, 1998 between
         Pennaco Energy, Inc. and Venture Capital Sourcing, SA (filed as Exhibit
         10.11 to the Company's Form 10-SB/A File No. 00-24881, filed September
         15, 1998 and included herein by reference).
 10.12 Purchase and Sale Agreement between Pennaco Energy, Inc., as Seller and
         CMS Oil and Gas Company, as Buyer, dated October 23, 1998 (filed as
         Exhibit 10.12 to the Company's Form 10-SB, File No. 00-24881, filed
         September 15, 1998 and included herein by reference).
 10.13 Secured Promissory Note dated October 23, 1998 from Pennaco Energy, Inc.
         to CMS Oil and Gas Company (filed as Exhibit 10.13 to the Company's Form
         10-SB, File No. 00-24881, filed November 24, 1998 and included herein by
         reference).
 10.14 Sublease Agreement dated October 23, 1998 between Pennaco Energy, Inc. and
         Evansgroup, Inc. (filed as Exhibit 10.14 to the Company's Form 10-SB/A
         File No. 00-24881 filed December 22, 1998 and included here by
         reference).
 10.15 Agreement Regarding the Drilling of Coal Bed Methane Wells (filed as
         Exhibit 10.15 to the Company's Form 10-SB/A File No. 00-24881, filed
         December 22, 1998 and included herein by reference).
 10.16 First Amendment to Purchase and Sale Agreement dated November 20, 1998
         (filed as Exhibit 10.16 to the Company's Form 10-SB/A File No. 00-24881,
         filed January 28, 1999 and included herein by reference).
 10.17 Second Amendment to Purchase and Sale Agreement dated January 15, 1999
         (filed as Exhibit 10.17 to the Company's Form 10-SB/A File No. 00-24881,
         filed January 28, 1999 and included herein by reference).
+10.18 Gas Gathering Agreement between Bear Paw Energy, Inc. and Pennaco Energy,
         Inc. dated February 1, 1999. (Portions of this Gas Gathering Agreement
         have been omitted based upon a request for confidential treatment.
         Additionally, the omitted portions have been filed with the SEC.)
+10.19 Gas Gathering Agreement between CMS Continental Natural Gas, Inc. and
         Pennaco Energy, Inc. dated March 1, 1999. (Portions of this Gas
         Gathering Agreement have been omitted based upon a request for
         confidential treatment. Additionally, the omitted portions have been
         filed with the SEC.)
+10.20 Gas Purchase Agreement between Western Gas Resources, Inc. and Pennaco
         Energy, Inc. dated April 1, 1999. (Portions of this Gas Purchase
         Agreement have been omitted based upon a request for confidential
         treatment. Additionally, the omitted portions have been filed with the
         SEC.)
+10.21 Base Contract for Short-Term Sale and Purchase of Natural Gas between
         Pennaco Energy, Inc. and Interenergy Resources Corporation dated April
         1, 1999. (Portions of this Base Contract for Short-Term Sale and
         Purchase of Natural Gas have been omitted based upon a request for
         confidential treatment. Additionally, the omitted portions have been
         filed with the SEC.)
+10.22 Gas Sales and Purchase Agreement between Montana--Dakota Utilities Co. and
         Pennaco Energy, Inc. dated March 1, 1999. (Portions of this Gas Sales
         and Purchase Agreement have been omitted based upon a request for
         confidential treatment. Additionally, the omitted portions have been
         filed with the SEC.)
*23.1  Consent of KPMG LLP
+23.2  Consent of Gibson, Haglund & Johnson (included in Exhibit 5.1)
+23.3  Consent of Hanifen Imhoff, Inc.
*23.4  Consent of Ryder Scott Company
</TABLE>



                                      II-5

<PAGE>
<TABLE>
<CAPTION>
EXHIBIT
 NO.   TITLE
- ------ --------------------------------------------------------------------------
<C>    <S>
+24.1  Power of Attorney
</TABLE>

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

+  Previously Filed

*   Filed Herewith

ITEM 28.  UNDERTAKINGS.

    Insofar as indemnification for liabilities arising under the Securities Act
of 1933 may be permitted to directors, officers and controlling persons of the
registrant, the registrant has been advised that in the opinion of the
Securities and Exchange Commission such indemnification is against public policy
as expressed in the 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 Act and
will be governed by the final adjudication of such issue.

    The undersigned registrant hereby undertakes:

    (1)  To file, during any period in which offers or sales are being made, a
post-effective amendment to this registration statement: (i) to include any
prospectus required by Section 10(a)(3) of the Securities Act of 1933; (ii) to
reflect in the prospectus any facts or events arising after the effective date
of the registration statement (or the most recent post-effective amendment
thereof) which, individually or in the aggregate, represent a fundamental change
in the information set forth in the registration statement. Notwithstanding the
foregoing, any increase or decrease in volume of securities offered (if the
total dollar value of securities offered would not exceed that which was
registered) and any deviation from the low or high end of the estimated maximum
offering range may be reflected in the form of prospectus filed with the
Commission pursuant to Rule 424(b) if, in the aggregate, the changes in volume
and price represent no more than a 20% change in the maximum aggregate offering
price set forth in the "Calculation of Registration Fee" table in the effective
registration statement; and (iii) to include any additional or changed material
information on the plan of distribution.

    (2)  that, for purposes of determining any liability under the Securities
Act of 1933, the information omitted from the form of prospectus filed as part
of this registration statement in reliance upon Rule 430A and contained in a
form of prospectus filed by the registrant pursuant to Rule 424(b)(1) or (4) or
497(h) under the Securities Act shall be deemed to be part of this registration
statement as of the time it was declared effective.


    (3)  that, for the purpose of determining any liability under the Securities
Act of 1933, each post-effective amendment that contains a form of prospectus
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 thereto.



                                      II-6

<PAGE>
                                   SIGNATURES


    PURSUANT TO THE REQUIREMENTS OF THE SECURITIES ACT OF 1933, AS AMENDED, THE
REGISTRANT CERTIFIES THAT IT HAS REASONABLE GROUNDS TO BELIEVE THAT IT MEETS ALL
THE REQUIREMENTS FOR FILING ON FORM SB-2 AND HAS DULY CAUSED THIS AMENDMENT TO
BE SIGNED ON ITS BEHALF BY THE UNDERSIGNED, THEREUNTO DULY AUTHORIZED, TO THE
CITY OF DENVER, STATE OF COLORADO, ON THE 3RD DAY OF AUGUST, 1999.


<TABLE>
<S>                             <C>  <C>
                                PENNACO ENERGY, INC.

                                By:               /s/ PAUL M. RADY
                                     -----------------------------------------
                                                    Paul M. Rady
                                              CHIEF EXECUTIVE OFFICER,
                                              PRESIDENT, AND DIRECTOR
</TABLE>


    PURSUANT TO THE REQUIREMENTS OF THE SECURITIES ACT OF 1933, AS AMENDED, THIS
REGISTRATION STATEMENT HAS BEEN SIGNED BY THE FOLLOWING PERSONS ON AUGUST 3,
1999 IN THE CAPACITIES INDICATED.


<TABLE>
<CAPTION>
             NAME                         TITLE
- ------------------------------  --------------------------

<C>                             <S>
              *
- ------------------------------  Chairman of the Board of
      Jeffrey L. Taylor           Directors

       /s/ PAUL M. RADY
- ------------------------------  President, Chief Executive
         Paul M. Rady             Officer, and Director

                                Chief Financial Officer,
              *                   Executive Vice
- ------------------------------    President, and Director
     Glen C. Warren, Jr.          (Principal Financial and
                                  Accounting Officer)

              *
- ------------------------------  Vice President, Legal,
      Gregory V. Gibson           Secretary, and Director

              *
- ------------------------------  Director
        David W. Lanza
</TABLE>

<TABLE>
<S>   <C>                        <C>                         <C>
*By:   /s/ GLEN C. WARREN, JR.
      -------------------------
        Glen C. Warren, Jr.,
      Pursuant to a
      power-of-attorney filed
      with the Registration
      Statement on Form SB-2
      (333-68317) on
      December 3, 1998.
</TABLE>

                                      II-7
<PAGE>
                                 EXHIBIT INDEX

<TABLE>
<CAPTION>
EXHIBIT
 NO.   TITLE
- ------ --------------------------------------------------------------------------
<C>    <S>
  3.1  Articles of Incorporation (filed as Exhibit 3.1 to the Company's Form
         10-SB File No. 00-24881, filed September 15, 1998 and included herein by
         reference).
  3.2  Bylaws (filed as Exhibit 3.2 to the Company's Form 10-SB, File No.
         00-24881, filed September 15, 1998 and included herein by reference).
 +4.1  Form of Warrant
 +5.1  Opinion of Gibson, Haglund & Johnson
 10.1  Mineral Lease Purchase Agreement dated February 23, 1998 between High
         Plains Associates, Inc. and Pennaco Energy, Inc. (filed as Exhibit 10.1
         to the Company's Form 10-SB/A File No. 00-24881, filed September 15,
         1998 and included herein by reference).
 10.2  Letter Agreement dated January 23, 1998 between High Plains Associates,
         Inc. and Taylor Oil Properties (filed as Exhibit 10.2 to the Company's
         Form 10-SB/A File No. 00-24881, filed September 15, 1998 and included
         herein by reference).
 10.3  Assignment of Option and Exercise of Option dated March 6, 1998 between
         High Plains Associates, Inc. and Pennaco Energy, Inc. (filed as Exhibit
         10.3 to the Company's Form 10-SB/A File No. 00-24881, filed September
         15, 1998 and included herein by reference).
 10.4  Agreement dated March 6, 1998 between High Plains Associates, Inc. and
         Pennaco Energy, Inc. (filed as Exhinbit 10.4 to the Company's Form
         10-SB/A File No. 00-24881, filed September 15, 1998 and included herein
         by reference).
 10.5  Pennaco Energy, Inc. 1998 Stock Option and Incentive Plan (filed as
         Exhibit 10.5 to the Company's Form 10-SB, File No. 00-24881, filed
         September 15, 1998 and included herein by reference).
 10.6  Form of Pennaco Energy, Inc. Incentive Stock Option Agreement (filed as
         Exhibit 10.6 to the Company's Form 10-SB, File No. 00-24881, filed
         September 15, 1998 and included herein by reference).
 10.7  Form of Pennaco Energy, Inc. Non-Statutory Stock Option Agreement (filed
         as Exhibit 10.7 to the Company's Form 10-SB, File No. 00-24881, filed
         September 15, 1998 and included herein by reference).
 10.8  Employment Agreement dated June 10, 1998 between Pennaco Energy, Inc. and
         Paul M. Rady (filed as Exhibit 10.8 to the Company's Form 10-SB, File
         No. 00-24881, filed September 15, 1998 and included herein by
         reference).
 10.9  Employment Agreement dated July 2, 1998 between Pennaco Energy, Inc. and
         Glen C. Warren, Jr. (filed as Exhibit 10.9 to the Company's Form 10-SB,
         File No. 00-24881, filed September 15, 1998 and included herein by
         reference).
 10.10 Secured Promissory Note dated August 13, 1998 from Pennaco Energy, Inc. to
         Venture Capital Sourcing, SA (filed as Exhibit 10.10 to the Company's
         Form 10-SB/A File No. 00-24881, filed September 15, 1998 and included
         herein by reference).
 10.11 Second Amendment to Security Agreement dated August 13, 1998 between
         Pennaco Energy, Inc. and Venture Capital Sourcing, SA (filed as Exhibit
         10.11 to the Company's Form 10-SB/A File No. 00-24881, filed September
         15, 1998 and included herein by reference).
 10.12 Purchase and Sale Agreement between Pennaco Energy, Inc., as Seller and
         CMS Oil and Gas Company, as Buyer, dated October 23, 1998 (filed as
         Exhibit 10.12 to the Company's Form 10-SB, File No. 00-24881, filed
         September 15, 1998 and included herein by reference).
 10.13 Secured Promissory Note dated October 23, 1998 from Pennaco Energy, Inc.
         to CMS Oil and Gas Company (filed as Exhibit 10.13 to the Company's Form
         10-SB, File No. 00-24881, filed November 24, 1998 and included herein by
         reference).
</TABLE>
<PAGE>

<TABLE>
<CAPTION>
EXHIBIT
 NO.   TITLE
- ------ --------------------------------------------------------------------------
<C>    <S>
 10.14 Sublease Agreement dated October 23, 1998 between Pennaco Energy, Inc. and
         Evansgroup, Inc. (filed as Exhibit 10.14 to the Company's Form 10-SB/A
         File No. 00-24881 filed December 22, 1998 and included here by
         reference).
 10.15 Agreement Regarding the Drilling of Coal Bed Methane Wells (filed as
         Exhibit 10.15 to the Company's Form 10-SB/A File No. 00-24881, filed
         December 22, 1998 and included herein by reference).
 10.16 First Amendment to Purchase and Sale Agreement dated November 20, 1998
         (filed as Exhibit 10.16 to the Company's Form 10-SB/A File No. 00-24881,
         filed January 28, 1999 and included herein by reference).
 10.17 Second Amendment to Purchase and Sale Agreement dated January 15, 1999
         (filed as Exhibit 10.17 to the Company's Form 10-SB/A File No. 00-24881,
         filed January 28, 1999 and included herein by reference).
+10.18 Gas Gathering Agreement between Bear Paw Energy, Inc. and Pennaco Energy,
         Inc. dated February 1, 1999. (Portions of this Gas Gathering Agreement
         have been omitted based upon a request for confidential treatment.
         Additionally, the omitted portions have been filed with the SEC.)
+10.19 Gas Gathering Agreement between CMS Continental Natural Gas, Inc. and
         Pennaco Energy, Inc. dated March 1, 1999. (Portions of this Gas
         Gathering Agreement have been omitted based upon a request for
         confidential treatment. Additionally, the omitted portions have been
         filed with the SEC.)
+10.20 Gas Purchase Agreement between Western Gas Resources, Inc. and Pennaco
         Energy, Inc. dated April 1, 1999. (Portions of this Gas Purchase
         Agreement have been omitted based upon a request for confidential
         treatment. Additionally, the omitted portions have been filed with the
         SEC.)
+10.21 Base Contract for Short-Term Sale and Purchase of Natural Gas between
         Pennaco Energy, Inc. and Interenergy Resources Corporation dated April
         1, 1999. (Portions of this Base Contract for Short-Term Sale and
         Purchase of Natural Gas have been omitted based upon a request for
         confidential treatment. Additionally, the omitted portions have been
         filed with the SEC.)
+10.22 Gas Sales and Purchase Agreement between Montana--Dakota Utilities Co. and
         Pennaco Energy, Inc. dated March 1, 1999. (Portions of this Gas Sales
         and Purchase Agreement have been omitted based upon a request for
         confidential treatment. Additionally, the omitted portions have been
         filed with the SEC.)
*23.1  Consent of KPMG LLP
+23.2  Consent of Gibson, Haglund & Johnson (included in Exhibit 5.1)
+23.3  Consent of Hanifen Imhoff, Inc.
*23.4  Consent of Ryder Scott Company
+24.1  Power of Attorney
</TABLE>


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

+  Previously Filed

*   Filed Herewith

<PAGE>
                                                                    EXHIBIT 23.1

                        CONSENT OF INDEPENDENT AUDITORS

We consent to the incorporation by reference in the Registration Statement on
Form S-8 relating to the Pennaco Energy, Inc. 1998 Stock Option and Incentive
Plan our report dated March 12, 1999, relating to the balance sheet of Pennaco
Energy, Inc. as of December 31, 1998 and the related statements of operations,
stockholders' equity and cash flows for the period from January 26, 1998
(inception) to December 31, 1998, which report appears in the December 31, 1998
Annual Report on Form 10-KSB of Pennaco Energy, Inc.

                                          /s/ KPMG LLP

                                          KPMG LLP

Denver, Colorado
August 2, 1999

<PAGE>


                                                                   EXHIBIT 23.4


August 3, 1999


                  CONSENT OF INDEPENDENT PETROLEUM ENGINEERS


     As independent petroleum consultants, we hereby consent to the
incorporation by reference of our reports included in this Form SB-2 into
Pennaco Energy, Inc.'s filed Registration Statement.


                                       /s/ Ryder Scott Petroleum Company
                                           Petroleum Engineers
                                       RYDER SCOTT COMPANY
                                       PETROLEUM ENGINEERS



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