Document:

EXHIBIT 10.61

                           PURCHASE AND SALE AGREEMENT

THIS PURCHASE AND SALE AGREEMENT (this "Agreement") is made and entered into
this 29th day of June, 2001, by and between Rocky Mountain Gas, Inc., with an
address of 877 North 8th West, Riverton, Wyoming 82501 (hereinafter as "RMG")
and CCBM, Inc., a Delaware Corporation, with an address of 14701 St. Mary's
Lane, Suite 800, Houston, Texas (herein referred to as "CCBM").

                                   BACKGROUND

WHEREAS, RMG is the owner of certain oil and gas or gas leases and certain
contractual rights related thereto, all being specifically described in the
following instruments (collectively, the "RMG Assets"):

A. Those certain Oil & Gas Leases or Option Agreements and wells described on
Exhibit "A", attached hereto and made a part hereof (the "Leases"), and the
royalty and overriding royalty in same as denoted on said Exhibit "A".

B. Agreement dated January 1, 2000, a copy of which is attached hereto and made
a part hereof as Exhibit "B-1", together with all amendments and revisions
thereto (the "Quantum Agreement").

C. Agreement dated December 31, 2000, a copy of which is attached hereto and
made a part hereof as Exhibit "B-2", together with all amendments and revisions
thereto (the "Suncor Agreement").

D. Agreement dated December 17, 1999, a copy of which is attached hereto and
made a part hereof as Exhibits "C-1, C-2, C-3", and C-4, together with all
amendments and revisions thereto (the , UPR Agreement, Infinity Agreement,
Lebsack Agreement, and Patina Agreement collectively referred as the " Oyster
Ridge Agreements").

WHEREAS, CCBM desires to purchase an undivided 50% interest in the RMG Assets
(the "Acquired Assets"); and

NOW, THEREFORE, in consideration of the mutual covenants, agreements, valuable
consideration, the receipt and sufficiency of which is hereby acknowledged by
the parties, the parties hereto agree as follows:

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                                    ARTICLE I
                      PURCHASE AND SALE OF ACQUIRED ASSETS

1.1 Transfer of Acquired Assets. Subject to the terms and conditions hereof, RMG
hereby sells, conveys, transfers, assigns and delivers to CCBM, and CCBM
purchases, acquires and accepts from RMG, an undivided fifty percent (50%) of
RMG's right, title and interest in and to the RMG Assets, together with an
undivided 50% of RMG's right, title and interest in and to any Oil and Gas
Leases, Option Agreements, contractual rights, coalbed methane leases, wells,
facilities and/or other right ("Interest") of RMG within the Area of Mutual
Interests whether or not the Interest is described in this Purchase and Sales
Agreement.

1.2 Representations and Warranties. RMG represents that (i) the Acquired Assets
are valid and in full force and effect, (ii) RMG owns the interest set forth on
the attached Exhibits and (iii) RMG owns the Acquired Assets free and clear of
all mortgages, pledges, liens, charges, security interests, encumbrances and any
burdens (excepting the rights created by the Suncor and Quantum Agreements and
provided for in the lease documents) or otherwise set forth in the lease
documents created by or in favor of RMG. RMG shall warrant title to the interest
conveyed to CCBM in the Acquired Assets as to all parties claiming by, through
or under RMG, but not otherwise.

1.3 Earnest Money Deposit. In accordance with that certain Letter of Intent
dated May 31, 2001 between RMG and CCBM, CCBM paid RMG the sum of a
non-refundable Earnest Money Deposit of $50,000, and RMG hereby acknowledges the
timely receipt of the Deposit. The Earnest Money Deposit shall be credited
against CCBM's obligation to spend $2.5 million for RMG's share of the drilling
program described in Section 2.1. Such credit shall apply to the final payment
(s) due by CCBM for such obligation.

1.4 Payment for Purchase. As consideration for the purchase and assignment of
the Acquired Assets, in addition to the remaining obligations set forth
elsewhere in this Agreement, CCBM will pay at closing to RMG a purchase price of
$7.5 million subject to reductions provided for in Section 1.5 (the "Purchase
Price") in the form of a promissory note in a form identical to Exhibit "D"
attached hereto ("the Note") secured solely by the Acquired Assets, excluding
any acreage or wells deemed to be earned pursuant to Section 2.1 (a) below.

For the consideration set forth herein, CCBM will be entitled to a 50% interest
in the RMG Assets. At Closing, RMG will assign the Acquired Assets to CCBM. The
Acquired Assets will be pledged back to RMG as collateral for the Note and
Mortgage until such collateral is released. RMG shall release 25% interest in
the Acquired Assets upon receiving principal payments totaling 33.3% of the
Purchase Price. When RMG receives principal payments totaling 66.6% of the
Purchase Price, 50% interest in the Acquired Assets shall be released as
collateral. Upon RMG receiving the entire Purchase Price plus all interest due,
all the remaining interest in the Acquired Assets shall be released as
collateral.

1.5 Title Defects and Remedies. CCBM has identified certain title defects as
identified in that certain letter dated June 15, 2001 a copy of which is
attached as Exhibit "I" and in the event

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<PAGE>

that additional title defects arise within 60 days of the Closing Date for any
of the Acquired Assets, upon written notice to RMG of the title deficiencies,
RMG shall have curative rights as follows:

     a.   RMG shall have 120 days from the date of the notice to cure the
          defects;

     b.   If the defect cannot be cured to CCBM's satisfaction within 120 days,
          RMG will have 60 additional days to offer to CCBM alternative acreage
          located in the same vicinity and of the same quality and quantity.
          CCBM, in its sole discretion may accept the alternative properties,
          recommend alternative properties or refuse the substitute properties;

     c.   If alternative property can not be agreed upon and if title is not
          cured within 180 days of notice, the Purchase Price (initially $7.5
          million) and the outstanding principal balance of the Note shall be
          reduced in an amount equal to the amount specified for each respective
          property identified on Exhibit " E" at the price per acre listed and
          the final payment due on the Note shall be reduced by such amount.

                                   ARTICLE II
                  DRILLING PROGRAM AND AREA OF MUTUAL INTEREST

2.1 Drilling Program for 2001. CCBM and RMG shall enter into a Joint Operating
Agreement ("JOA") identical in form to the agreement attached hereto as Exhibit
"F", which shall govern operations on the RMG Assets, and the Area of Mutual
Interest ("AMI"), as defined below. RMG shall be designated as the Operator,
subject to the JOA.

(a) CCBM agrees to fund $5,000,000 for an initial drilling program on the
    Acquired Assets. As funded, CCBM will earn a 50% interest of RMG's interest
    in each well drilled and a 50% ownership in RMG's ownership interest in the
    associated acreage, (i.e. 80 acres per well), and production. CCBM's
    ownership in such wells shall be earned regardless of the status of the Note
    or CCBM's ownership in the balance of the RMG Assets. RMG will be carried
    for the initial drilling program and will retain the remaining 50% interest.
    After the above $5,000,000 is expended, subject to the JOA, all future
    operations will be funded equally by CCBM and RMG.

(b) Notwithstanding anything to the contrary, prior to the expenditure of any
    monies attributable to the $5,000,000 to be funded by CCBM, RMG shall
    furnish CCBM with an Authority for Expenditure ("AFE") in accordance with
    the Procedure set forth in the JOA for CCBM's review and approval for each
    individual well to be drilled and completed or for facilities construction.
    Such AFE's shall be in a form similar to that set out in Exhibit "G".
    Multiple AFE's may be submitted by RMG to CCBM, however for the period
    beginning July 1, 2001, and ending November 30, 2001 no more than a
    cumulative amount of $1.5 million of AFE's may be submitted during any
    thirty (30) day period unless mutually agreed upon by both parties. RMG
    shall cash call CCBM only for work RMG

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<PAGE>

    reasonably expects to complete during the ensuing 30 day period. Cash calls
    and such AFE amounts shall be due and payable by CCBM to RMG within five (5)
    business days of commencement of work related to each individual AFE. Any
    portion of the $5,000,000 not expended during calendar year 2001 shall be
    carried over to the 2002 and 2003 drilling program or to property
    acquisitions, if mutually agreed to by the parties. No payment shall be due
    until CCBM has received copies of all permits, rights of way, title
    opinions, surface use agreements and any other ancillary agreements
    necessary for the operation for which the cash call is being made along with
    representations from RMG that the operation will be conducted during the
    ensuing 30 day period, unless mutually agreed upon in writing by the
    parties. It is specifically agreed and understood that the aforementioned
    $5,000,000 funded by CCBM shall not be expended for any operation associated
    with water disposal wells, compression beyond 100 PSIG nor for facilities
    downstream of compression beyond 100 PSIG. Further, the $5,000,000 funded by
    CCBM will only be used to pay for CCBM's final working interest and an equal
    working interest for RMG. CCBM's final working interest will not be less
    than 50% of CCBM's paying interest, less and except the $225,000 Suncor
    drilling program per section 2.5, unless approved by CCBM in writing. Should
    a cash call amount not be expended during the ensuing 30 day period, the
    unspent portion of such cash call shall be applied to a subsequently due
    cash call or shall be immediately refunded if not used for the AFE for which
    the cash call was made within 90 days of being delivered.

(c) In the event less then the entire $5,000,000 is expended as provided above,
    within two (2) years of the closing date (subject to extensions for Force
    Majeure), CCBM shall pay to RMG one-half of the unspent portion of the
    $5,000,000. The foregoing payment is subject to RMG complying with all of
    the terms and provisions of this Agreement, the JOA and the procedures set
    forth therein for submitting AFE's to drill $5 million worth of "reasonable
    wells". A "reasonable well" shall meet the following economic criteria:

          1.   Individual well cost, including hook-up to sales, must meet a
               projected internal rate of return ("IRR") in excess of 15% at
               prevailing market prices.

          2.   Such wells must be on acreage blocks that are touching and
               contain a minimum size as follows:

                    a)  Kirby - at least 2560 acres
                    b)  Clearmont - at least 640 acres
                    c)  Arvada - at least 480 acres

          3.   No more than 10 wells/calendar year at Oyster Ridge qualify as
               reasonable.

The intent of this provision is for CCBM to spend $2.5 million on behalf of RMG.
If CCBM fails to do this despite a total of $5,000,000 of reasonable well
proposals by RMG then CCBM shall be obligated to pay any remaining unspent
portion of the $2.5 million directly to RMG.

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2.2 Allocation and Payment of Revenue. CCBM is entitled to 20% of RMG's net
revenue interest from all wells jointly drilled under this Agreement (per
Sections 2.1 or 2.2) until such time as the net revenue received by CCBM from
this additional interest equals a total of $1,250,000 in dollars of the day or
CCBM defaults on the Note. The revenues due CCBM shall not be paid to CCBM in
cash, but instead, RMG shall apply such revenue towards prepayment of the Note,
with such payments being applied towards the final payment due under the Note.
The $1,250,000 mentioned above will be reduced proportionately with reductions
in the Purchase Price, if any, under Section 1.5.

2.3 Area of Mutual Interest. CCBM and RMG hereby establish an AMI, which shall
include the entire State of Wyoming and the Powder River Basin of Montana as
outlined on Exhibit "H", which is attached hereto and made a part hereof, and
subject to pre-existing AMI's between RMG, Quaneco and Suncor. The AMI shall be
for a four year term commencing on June 30, 2001 and ending on June 30, 2005
unless otherwise modified by the terms herein or modified by the mutual written
consent of the parties. The JOA shall govern operations within the AMI with CCBM
and RMG each owning a 50% interest in the AMI.

2.4 Management Committee. CCBM and RMG shall form a Management Committee for the
purpose of overseeing operations on the RMG Assets.

(a) The Management Committee shall be composed of two (2) Members representing
    CCBM and two (2) Members representing RMG. There shall be at least two (2)
    Members representing CCBM and two (2) Members representing RMG at a meeting
    to constitute a quorum for the Management Committee.

(b) Upon payment of the Purchase Price, and with the consent of Quaneco, CCBM
    shall be allocated one of the RMG Managing Member seats with Powder River
    Gas, LLC provided for in the Quaneco Agreement (Exhibit B-1 in Section
    3.4(c) (ii)). Prior to such time, RMG agrees to consult with CCBM in order
    to come to mutual Agreement on all major decisions made by Powder River Gas,
    LLC.

(c) The Management Committee shall:

     i.   Review and recommend overall annual and quarterly capital expenditures
          and preparing for approval budgets for all expenditures for each
          succeeding quarter relating to the Acquired Assets.

     ii.  Review such other matters as may be necessary to option and/or lease
          lands, drill and complete or otherwise conduct activities within the
          AMI.

     iii. Review drilling results and the costs thereof in relation to the
          budget approved by the Management Committee, and make recommendations
          and modifications to the budget as necessary;

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     iv.  Review all drilling contracts to determine that they are competitive,
          and if necessary negotiate competitive drilling contracts for future
          drilling;

     v.   Investigate whether to build or contract out the building of the
          gathering system;

     vi.  Meet not less than quarterly or at the request of either CCBM or RMG.
          The meeting site shall alternate between Sheridan/Riverton, Wyoming
          and CCBM offices in Houston, Texas, unless otherwise agreed to by the
          Parties;

     vii. Conduct any other business necessary to oversee this Agreement.

(d) It is specifically agreed that RMG shall have a tie breaking vote concerning
all general operations as outlined herein until the $5 million drilling
commitment has been expended and until the Purchase Price has been paid.

2.5 Suncor Option Acreage.

(a) The Suncor Agreement (Exhibit B-2) contains a provision whereby RMG has
provided Suncor Energy of Calgary, Alberta ("Suncor") an option to purchase a
37.5% net working interest in approximately 112,000 acres in Montana ("Option
Acreage") known as the Castle Rock Project with a remaining balance of
approximately $2,900,000 from Suncor to RMG, due in February 2002, plus various
drilling commitments. If Suncor exercises the option, all proceeds of such sale
will be solely for the benefit of RMG. If Suncor does not exercise its option
with RMG, then CCBM shall have thirty (30 day) after receipt of written notice
from RMG to elect to purchase 50% of RMG's interest in the Option Acreage for
the equivalent value that would have been due RMG under the Suncor Agreement. If
CCBM does not exercise this option on or before thirty (30) days after receipt
of written notice, then the Option Acreage will belong solely to RMG and will be
removed from the AMI.

CCBM and RMG have agreed that RMG will AFE CCBM for $225,000 on July 1, 2001 for
RMG's obligations for the wells to be drilled for the drilling program that will
take place beginning in July of 2001 with Suncor as operator on the Castle Rock
Properties in Montana. Subject to obtaining the consent of Quaneco and Suncor,
and as consideration for CCBM funding the above-mentioned AFE, CCBM shall
receive an undivided 6.25% working interest in the wells drilled and the leases
underlying an 80 acre area attributable thereto during the 2001 drilling program
conducted by Suncor. The $225,000 funded and paid by CCBM shall be part of the
$5,000,000 drilling program described in Section 2.1.

2.6 Rentals, Surface Use and Option Payments. Subject to the provisions of the
JOA, RMG and CCBM will each be obligated to pay one-half (1/2) of all on going
payments of any kind to maintain any and all leases, options and farmin
agreements and pay for all surface use agreements and other ongoing obligations
on the Acquired Assets. RMG shall AFE CCBM for these costs (not to exceed
$500,000), which will be part of the $5,000,000 drilling program. After
completion of the $5,000,000 drilling program or expenditures of this type
reaching the $500,000 cap each party shall be responsible for its share of these
payments.

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2.7 Land Bank Fund. CCBM agrees that it will use its best efforts to seek out,
obtain and secure financing and raise no less than $20 million to be used for
the acquisition of lease hold interests to develop oil and gas properties within
the AMI. Such funds will be secured and be available for use on or before June
30, 2002, subject to the terms of the financing agreement(s) between the
lender(s) and RMG and CCBM. In the event CCBM is unable to establish the Land
Bank Fund prior to June 30, 2002, RMG shall notify CCBM of its desire to extend
the AMI for or before December 20, 2002. Failure to notify CCBM shall result in
AMI being reduced to a 6 mile radius on all then existing properties held
jointly by the Parties.

                                   ARTICLE III
                  RIGHT TO RECORDS AND INSPECTION OF PROPERTIES

3.1 Book and records. Upon 10 days of CCBM's written request, RMG shall provide
CCBM with access to and upon request the ability to copy all books, maps,
records, title records, files or other information related to the Acquired
Assets in the possession of RMG, or within RMG's control to obtain, relating to
RMG's activity on the Acquired Assets and within the AMI. CCBM shall reimburse
RMG for its reasonable costs in providing such copies. Similarly, upon 10 days
written request, CCBM shall provide to RMG access to and upon request, the
ability to copy all books, maps, records, title records, files or other
information related to the RMG Assets in the possession of CCBM, or within
CCBM's control to obtain, relating to CCBM's activity on the RMG Assets and
within the AMI. RMG shall reimburse CCBM for its reasonable costs in providing
such copies.

3.2 Access to Inspection of the RMG Assets. Either Party may independently
inspect or cause to be inspected by other qualified persons, at their sole cost
and expense, all aspects of the RMG Assets which in its sole discretion are
relevant or material to their undivided working interest in the RMG Assets.

                                   ARTICLE IV
                                     CLOSING

4.1 CCBM's Conditions to Closing.

The obligation of CCBM to close the transaction consistent with this Agreement
is subject to CCBM's satisfaction, as determined solely by CCBM, of the
following conditions which are for the sole benefit of CCBM and which may be
waived in whole or in part by CCBM at any time on or before the Closing Date.

     (a) CCBM shall have satisfied itself regarding RMG's represented interests
     in the Acquired Assets including, but not limited to, verification that RMG
     owns such represented interests as listed on the attached on Exhibit "A"
     and is capable of assigning such interest to CCBM;

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     (b) Any consents, rights of refusal or other restrictions on the farmout,
     transfer, disposition, sale or assignment by RMG of any of the working
     interests or net revenue interests represented in Exhibit "A" shall have
     been waived or complied with;

     (c) CCBM shall have the opportunity to review, and shall be satisfied with,
     all agreements relating to RMG's interest in the Acquired Assets.

     (d) RMG shall continue to diligently pursue all permits necessary for
     drilling and production for state, fee and federal land locations on the
     Acquired Assets and CCBM shall be satisfied with the status thereof;

     (e) Subject to no material change in the environmental issues or
     liabilities occurring between May 31, 2001 and the Closing Date, CCBM shall
     have the opportunity to conduct an environmental audit or inspection on the
     Acquired Assets and be satisfied that there are:

          (1)  no significant environmental issues which would constrain
               coalbed methane exploration, development and production activity,
               and

          (2)  no significant outstanding environmental liabilities;

     (f) If appropriate, CCBM shall have received releases and registerable
     discharges from all parties holding security interests against RMG's
     interest in the Acquired Assets.

     (g) Subject to no material change in the facts occurring between May 31,
     2001 and the Closing Date, CCBM shall review and evaluate any and all
     claims or proceedings threatened or pending involving RMG in connection
     with the Acquired Assets.

     (h) All of RMG's interest in the Acquired Assets shall not be subject to
     any contracts for the sale of petroleum substances.

     (i) Subject to the approval of the Board of Directors of CCBM and the
     consent and approval CCBM's lenders under existing debt agreements.

4.2 RMG's Conditions to Closing.

The obligation of RMG to close the transaction consistent with this Agreement is
subject to RMG's satisfaction, as determined solely by RMG, of the following
conditions which are for the sole benefit of RMG and which may be waived in
whole or in part by RMG at any time on or before the Closing Date.

     (a) RMG shall have received the $50,000 non-refundable Earnest Money
         Deposit as described in Section 1.3.

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     (b) RMG shall have satisfied itself that CCBM will commit to establishing a
         "Land Bank" in the amount of $20 million or more from outside sources
         for the financing of future land acquisitions within the AMI. If such
         Land Bank is not established by June 30, 2002, the AMI described in
         paragraph 2.7, may be reduced consistent with paragraph 2.7. If a Land
         Bank is established in an amount less than $20 million and committed to
         be used to fund an AMI acquisition, such AMI Interest shall be included
         in the existing joint property package.

     (c) Subject to the approval of the Board of Directors of RMG.

4.3 Closing Date. The transfer of an undivided fifty percent (50%) of RMG's
right, title and interest in the RMG Assets to CCBM and all other transactions
contemplated by this Agreement (the "Closing") shall take place at the offices
of RMG in Riverton, Wyoming at 2:00 p.m., local time on June 29, 2001 or at such
other time or other place as RMG and CCBM may mutually agree (the "Closing
Date").

4.4 Deliveries by RMG. At the Closing, RMG shall deliver the following to CCBM,
the receipt of which shall be a condition to Closing:

     (a) The duly executed Assignment in recordable form transferring an
         undivided fifty percent (50%) of RMG's right, title and interest in the
         RMG Assets to CCBM.

     (b) Such other documents as may are reasonably requested by CCBM or its
         counsel.

4.5 Deliveries by CCBM. At the Closing, CCBM shall deliver the following, the
receipt of which shall be a condition to Closing:

     (a) The Note and Mortgage as described in Section 1.4. (a).

                                    ARTICLE V
                      REPRESENTATIONS AND WARRANTIES OF RMG

The RMG represents and warrants to CCBM as follows:

5.1 Organization and Qualification. RMG is a corporation duly organized under
the laws of the State of Wyoming, and has all corporate powers to own its
properties and to carry on its business as now owned and operated by RMG. RMG is
qualified to do business, is in good standing, and has all appropriate or
necessary licenses in each jurisdiction or place in which the nature of its
business or the character of its properties requires such registration.

5.2 Authority to Transfer. RMG has the right, power, legal capacity and
authority to enter into this Agreement, to perform its obligations hereunder and
to consummate the transactions contemplated hereby, and no approvals,
authorizations or consents of any person other than RMG are necessary in
connection with RMG's execution, performance and delivery of this

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<PAGE>

Agreement. This Agreement constitutes the legal, valid and binding obligation of
RMG, enforceable against RMG in accordance with its terms, except as enforcement
may be limited by bankruptcy, insolvency, reorganization, moratorium or similar
laws or equitable principles relating to or limiting creditor's rights
generally.

5.3 Title to Acquired Assets. RMG has unencumbered title to all of the Acquired
Assets.

5.4 Condition of Acquired Assets. From May 31, 2001 through the Closing Date,
RMG shall not enter into any agreements, or amend any existing agreements
relating to the Acquired Assets, nor shall RMG enter into any agreements
relating to the sale of production of petroleum substances therefrom, save and
except for such agreements and expenditures as are in the normal course of
business or approved in writing by CCBM. Furthermore, RMG agrees to not directly
or indirectly market its interest in the Acquired Assets or the AMI to any other
party through the Closing Date.

5.5 Agreement Not in Breach of Other Instruments. Subject to the consent
requirements in the Suncor, Quantum and Oyster Ridge Agreements, the execution
and delivery of this Agreement and the other documents to be executed and
delivered in connection herewith and the consummation of the transactions
contemplated hereby and thereby will not result in or constitute any of the
following: (a) a default or event that, with the giving of notice or lapse of
time, or both, would be a default breach or violation of any operating agreement
of RMG or any agreement, instrument or arrangement to which RMG is a party or by
which RMG or any assets or property of RMG is bound; (b) an event that would
permit any party to terminate any contract or other agreement; or (c) the
creation or imposition of any lien, charge, or encumbrance an any of the
Acquired Assets.

5.6 Indemnity Suncor. RMG agrees to defend, indemnify and hold harmless CCBM,
and its Acquired Asset from any and all debts, losses, liabilities, duties,
damages, obligations, payments, settlement, judgment or compromise, cost and
expenses (including, without limitation, any attorneys' fees and any and all
expenses incurred for investigating, preparing or defending any such Action)
under, out of or in connection with any dispute, suite arbitration, or
proceeding (collectively "Action") related in any way whatsoever to the Article
IV, Section 4.2, ;under the Suncor Agreement.

                                   ARTICLE VI
                     REPRESENTATIONS AND WARRANTIES OF CCBM

CCBM represents and warrants to RMG as follows:

6.1 Organization and Qualifications. CCBM is a corporation duly organized under
the laws of the State of Texas, and has all corporate power to own its
properties and to carry on its business as now owned and operated by CCBM. CCBM
is qualified to do business, is in good standing, and has all appropriate or
necessary licenses in each jurisdiction or place in which the nature of its
business or the character of its properties requires such registration.

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6.2 Authority to Purchase. CCBM has the right, power, legal capacity and
authority to enter into this Agreement, to perform its obligation hereunder and
to consummate the transactions contemplated hereby, and no approvals,
authorizations or consents of any person other than CCBM is necessary in
connection with CCBM's execution, performance and delivery of this Agreement.
This Agreement constitutes the legal, valid, and binding obligation of CCBM,
enforceable against CCBM in accordance with its terms, except as enforcement may
be limited by bankruptcy, insolvency, reorganization, moratorium or similar laws
or equitable principles relating to or limiting creditor's rights generally.

                                   ARTICLE VII
                                   TERMINATION

7.1 Termination. This Agreement may only be terminated by the mutual consent of
both RMG and CCBM.

                                  ARTICLE VIII
                                 CONFIDENTIALITY

8.1 Confidentiality

     (a) Until the Closing Date, there shall be no public release of information
     of any kind by RMG or CCBM with respect to this transaction unless mutually
     approved by the parties, or, if such release is required by the law,
     including necessary disclosure under the security laws, then the parties
     shall receive and approve a copy of such release at least twenty four (24)
     hours prior to its dissemination, unless waived by both parties.

     (b) In the event CCBM does not close the transaction consistent with this
     Agreement, CCBM agrees to return all information of any kind obtained by it
     from RMG, and its agent and representative, concerning the Acquired Assets,
     including proprietary data obtained from drilling and testing coalbed
     methane wells on the Acquired Assets ("Information") and to keep any and
     all Information obtained by CCBM or its agents and representatives
     confidential for a period of four (4) years from May 31, 2001. The
     Information obtained by CCBM shall not be considered confidential if:

         (i) It obtained such Information from the public domain other than as a
             result of a disclosure by RMG, or one of its agents or
             representatives;

         (ii) Such Information became available to CCBM on a non-confidential
             basis from a source other than RMG, or one of its agents or
             representatives, where that source has represented CCBM it is
             entitled to disclose it; or

         (iii)Such Information was known to CCBM on a non-confidential basis
             prior to its disclosure to CCBM by RMG, or one of its agents or
             representatives.

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                                   ARTICLE IX
                               GENERAL PROVISIONS

9.1 Notices. All notices and other communication hereunder ("Notices") shall be
in writing and shall be deemed given upon personal delivery, facsimile
transmissions (with written or facsimile confirmation of receipt), or delivery
by a reputable overnight commercial delivery service (delivery, postage or
freight charges prepaid) on the fourth day following deposit in the United
States mail (if sent by registered or certified mail, return receipt requested,
delivery, postage or freight charges prepaid), addressed to the parties at the
following addresses (or at such other address for a party as shall be specified
by like Notice):

      If to RMG:

      Rocky Mountain Gas, Inc.
      1 East Alger
      Suite 206
      Sheridan, WY  82801
      Fax: (307) 673-9711
      Attn: Peter G. Schoonmaker, President
      And

      U.S. Energy Corp.
      877 N. 8TH West
      Riverton, WY 82501
      Fax: (307) 857-3050
      Attn: Keith G. Larsen, President

      If to CCBM:

      CCBM, INC.
      14701 St. Mary's Lane, Suite 800
      Houston, TX 77079
      Fax: (281) 496-0884
      Attn: Ken Trahan

9.2 Survival of Representations, Warranties, Covenants and Agreements, All
representations, warranties, covenants, obligations, liabilities and agreements
of the parties contained in this Agreement or in any schedule, document
certificate or other instrument delivered by or on behalf of the parties
pursuant to this Agreement, shall survive the Closing Date, except for the
representations and warranties contained in Sections 1.2 and 5.3, which are
limited in their application solely to events or circumstances occurring or
arising before the transfer of the Acquired Assets to CCBM.

                                       12

9.3 Further Assurances. The parties hereto agree to do such further acts and to
execute and deliver any additional agreements or documents as maybe required to
consummate, evidence or confirm the transactions and agreements contained in
this Agreement.

9.4 Entire Agreement, Amendment Waivers. This Agreement and any exhibits
delivered by the parties hereto contemporaneously herewith constitute the entire
agreement between the parties pertaining to the subject matter contained herein
and supersede all prior agreement, representations and understandings of the
parties hereto. No supplement, modification or amendment of this Agreement shall
be binding unless executed in writing by all of the parties hereto.

9.5 Binding Upon Heirs and Successors. This Agreement shall be binding upon and
inure to the benefit of the respective successors, heirs, assigns and personal
representatives of the parties hereto.

9.6 Signatures in a Representative Capacity. Each party whose signature is
affixed hereto in a representative capacity represents and warrants that he is
authorized to execute this Agreement on behalf of and to bind the entity on
whose behalf his signature is affixed.

9.7 Governing Law. This Agreement shall be construed in accordance with and be
governed by the laws of the State of Wyoming.

9.8 Severability. In the event any provision of this Agreement shall be held to
be void or unenforceable, the remaining provisions shall remain in full force
and effect.

9.9 Expenses. Each party to this Agreement shall bear its own expenses in
connection with this Agreement and the transactions contemplated hereby.

9.10 Currency. All references herein to dollars or "$" shall be in the currency
of the United States of America.

9.11 Headings. The paragraph heading in this Agreement are included for ease and
reference only and are in no way intended to describe, interpret, define or
limit the scope of this Agreement or any provisions hereof.

9.12 Arbitration. Any dispute that arises by virtue of this Agreement between
CCBM and RMG shall be resolved by arbitration pursuant to the rules and
procedures of the American Arbitration Association and governed by the laws of
the State of Wyoming. Arbitration shall be conducted in the state of Colorado.

                                       13

<PAGE>

IN WITNESS WHEREOF, the parties have executed this Agreement as of the 29th day
of June, 2001.

ROCKY MOUNTAIN GAS, INC.                    CCBM, INC.

By:    /s/   KEITH G. LARSEN                By:   /s/   S.P. JOHNSON
   -------------------------------             ---------------------------------

Title:       CEO                            Title:      PRESIDENT
      ----------------------------                ------------------------------

                                       14EXHIBIT 10.62

                            BIG BASIN PETROLEUM, LLC
                                  P.O. BOX 1581
                             GILLETTE, WYOMING 82717
                            307-685-4210 - TELEPHONE

                                 April 12, 2002

U.S. ENERGY CORP.                   AND              ROCKY MOUNTAIN GAS, INC.
ATTN: KEITH LARSEN                                   ATTN: PETE SCHOONMAKER
877 North 8th West                                   1 Alger St. Suite 206
Riverton, WY 82501                                   Sheridan, WY  82801

     Re:  PURCHASE AND SALE AGREEMENT - BOBCAT CBM PROJECT - CAMPBELL COUNTY,
WYOMING

Gentlemen:

     This letter, when executed by you, will represent the Agreement, subject to
the terms and conditions set forth herein, whereby Big Basin Petroleum, LLC (the
"Seller") will sell, assign and convey, or cause to be sold, assigned and
conveyed, to U.S. Energy Corp. and Rocky Mountain Gas, Inc. (herein the "Buyer")
for the consideration stated below, all oil and gas interests in certain
properties located in Campbell County, Wyoming as defined in Article 1.02 below.

                           PURCHASE AND SALE AGREEMENT
                                   ARTICLE I.

     1.01 PURCHASE AND SALE. Seller agrees to sell and convey and Buyer agrees
to purchase and pay for the Property (as defined in Article 1.02 below), subject
to the terms and conditions of this Agreement.

     1.02 PROPERTY. All of the following shall be called the "Property":

<PAGE>

U.S. ENERGY CORP.
April 12, 2002
Page -2-

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

          a) All of Seller's working interest in and to the entire estate
     created by the Leases described in Exhibit "A", and all NPDES discharge
     permits, State Engineer permits, contracts, reservoir permits, Surface Use
     Agreements, Access Agreements and rights on or covering the lands subject
     to the Leases described on Exhibit "A" and the coalbed methane wells
     described on Exhibit "A" (subject to the provisions of Article 4.01,
     below), and

          b) All of Seller's interest in and to all of the personal property,
     fixtures and improvements thereon, appurtenant thereto or used or obtained
     in connection with the land and wells described in Exhibit "A", or with the
     production, treatment, compression, sale or disposal of hydrocarbons or
     water produced there from or attributable thereto and all other
     appurtenances thereunto belonging.

     1.03 EFFECTIVE TIME. The purchase and sale of the Property shall be
effective for all purposes as of May 1, 2002, at 7:00 A.M. local time (herein
called the "Effective Time"), unless Closing does not occur in May, 2002, in
which case the Effective Time shall be the first day of the month in which a
Closing takes place.

     1.04 LEASE SCHEDULE. On or before April 18, 2002, Seller shall provide
Buyer with a Lease Schedule in the form of Exhibit "A", showing the gross and
net acres covered by all leases and the Seller's net revenue interest in the
leases.

                                   ARTICLE II.
                                 PURCHASE PRICE

     2.01 PURCHASE PRICE. The purchase price for the Property shall be
$1,300,000 (herein called the "Purchase Price"), which shall be paid as set
forth in Article 2.02 below.

<PAGE>

U.S. ENERGY CORP.
April 12, 2002
Page -3-

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

     2.02 PAYMENT OF PURCHASE PRICE. The Purchase Price shall be paid as
follows:

          a)   Buyer shall pay the Seller the sum of $200,000 upon execution of
               this Agreement (which is refundable only in accordance with
               Article 3.04, below), by company check, receipt whereof is hereby
               acknowledged.

          b)   The sum of $800,000 by cashier's check or wire transfer at
               Closing; and

          c)   The balance of $300,000 shall be paid by issuance of 75,000
               shares of common stock of U.S. Energy Corp. (NASDEQ:USEG)
               restricted as to transfer, valued at $300,000. A private
               placement memorandum will be provided to Seller from U.S. Energy
               Corp., and Seller agrees to execute an investment letter and to
               accept the stock for investment purposes only.

          After expiration of any holding period as required by Rule 144 of the
          rules and regulations of the Securities and Exchange Commission, Buyer
          shall assist and consent to the Seller's sale of shares of common
          stock of U.S. Energy Corp. in the public markets.

                                  ARTICLE III.
                              ADDITIONAL AGREEMENTS

     3.01 TITLE PROCEDURE. Seller shall promptly, within three (3) business days
of Seller accepting this offer, make available to the Buyer, at the office of
the Buyer, true and complete copies of all of the Seller's title information
concerning the Property, including (i) copies of the Leases, contracts,
easements and other agreements respecting the Property; (ii) copies of all
Opinions of Title, landman reports or other certificates of title to the
Property; (iii) all letters or other documents establishing any adverse claim to
title to any of the Property; (iv) and other information concerning title to the
Property available to the Seller. Buyer shall then undertake such title
examination as it deems prudent at its sole further cost and expense. Seller
agrees to authorize Thomas

<PAGE>

U.S. ENERGY CORP.
April 12, 2002
Page -4-

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

S. Throne, attorney at law, of Sheridan, Wyoming, to prepare an updated Title
Opinion for Buyer and Throne is authorized to assign the rights to the original
Title Opinion on the Property to Buyer.

     3.02 WITHDRAWAL BY BUYER. The Buyer may withdraw from this Purchase and
Sale Agreement at any time prior to May 7, 2002, if in the reasonable opinion of
Buyer or its counsel, Seller does not have good and merchantable title to the
Property. In the case that Buyer reasonably determines that the Seller does not
have good and merchantable title to the Property, then Buyer may, at its
election, withdraw from this Agreement by giving written notice to the Seller of
its intent to withdraw, specifying the reason for such withdrawal.

     3.03 CASUALTY LOSS. If, prior to the Closing, all or any portion of the
Property shall be destroyed by fire or other casualty, Seller may, at its option
and its expense, restore or replace such destroyed portion prior to Closing. If
such restoration or replacement cannot be effectuated prior to Closing, if
Seller does not choose to undertake such effort, or if any portion of the
Property shall be taken in condemnation or under the right imminent domain or if
proceedings for such purpose shall be pending or threatened, Buyer may elect to
terminate this Agreement and Seller will refund Buyer's down payment referred to
in Article 2.02a under the terms outlined in Article 3.05(iv). If Buyer shall so
elect, neither party shall have any further obligation to the other hereunder.
If not so terminated, this Agreement shall remain in full force and effect.

     3.04 DATA PROVIDED Prior to the signing of this agreement the Seller
provided Buyer with daily gas production and sales information from the
properties. Seller represents and warrants that this information is correct
within a tolerance of 10%. Buyer will have until May 6, 2002 to verify this
information. If the Buyer justly gives written notice to Seller and provides
evidence the numbers are not within the 10% tolerance, the $200,000 down payment
will be refundable under the terms of 3.05 (iv) described below.

     3.05 REFUND OF DOWN PAYMENT AND TERMINATION OF AGREEMENT. The down payment
set forth in Article 2.02.a., above shall be refundable upon:

<PAGE>

U.S. ENERGY CORP.
April 12, 2002
Page -5-

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

     (i)  withdrawal if allowed under Article 3.02, above, or the Agreement is
          terminated as allowed by Article 3.03, above; or

     (ii) the net mineral acres identified on the Lease Schedule identified as
          Exhibit "A" described in Article 1.04 shall be determined on or before
          May 6, 2002, to be 10%, or more, less than stated in such Lease
          Schedule; or

     (iii) the net revenue interests as identified on the Lease Schedule
          described in Article 1.04 shall be determined to be, on or before May
          6, 2002, 1%, or more, less than the amount as represented on the Lease
          Schedule as to 10% or more of the leases identified on the Lease
          Schedule.

     (iv) If Seller is unable to refund the down payment of $200,000 per the
          terms listed above in Article 2.02 and Article 3.04 per the terms and
          conditions contained herein, at the time of termination of this
          Agreement, Seller will assign to Buyer a production payment of 50% of
          the net revenue interest in the Property owned by the Seller until
          such time as the buyer has recovered the $200,000 in full, together
          with interest accruing at a rate of 10% per annum.

          Provided, however, that in the event Buyer determines any of the
          foregoing failures of title exist, Buyer shall give written notice
          thereof to the Seller on or before May 6, 2002, and Buyer shall
          thereby be entitled to a refund of the sum described in Article
          2.02.a. and this Agreement shall then be terminated.

     ARTICLE IV. PROPERTY INTEREST TO BE CONVEYED

     4.01 RESERVED OVERRIDING ROYALTY. To the extent that the Seller's interest
in and to any of the Oil and Gas Leases described on Exhibit "A", attached,
exceed an eighty percent (80%) net revenue interest, the Seller shall reserve
the difference between the existing royalty and overriding royalty burdens on
any such Oil and Gas Lease and eighty percent (80%) as an overriding royalty to
be retained by the Seller free and clear of costs of production.

<PAGE>

U.S. ENERGY CORP.
April 12, 2002
Page -6-

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     4.02 NO WARRANTIES. At Closing, Seller shall make, execute and deliver its
Assignments and Bill(s) of Sale to the Property without warranty of title
express or implied, but specifically warranting only against claims by, through
or under the Seller, but not otherwise. All of the Property shall be conveyed
"as is, where is", without representation or warranty as to the condition or
fitness of any such Property.

     4.03 TAXES. The parties have also agreed that at Closing all ad valorem,
property, and similar taxes based upon or measured by the value of the Property
are to be prorated between Seller and Buyer as of the Effective Date.

     4.04 CONDUCT OF OPERATIONS PENDING CLOSING. Prior to Closing, Seller agrees
that Seller shall cause Big Basin Petroleum, LLC to (i) continue to maintain and
operate the Property and related assets in the ordinary course of business and
consistent with prudent operation and past practice; (ii) maintain any insurance
now in force or required by law, or normally carried by a prudent owner or
operator with respect to the Property and related assets; (iii) pay or cause to
be paid all costs and expenses incurred before the Effective Date in connection
with the development, maintenance and operation of the Property and related
assets; (iv) insure that all the related assets are maintained in their present
working condition; and (v) perform and comply with all of the material terms,
provisions and conditions contained in the leases which constitute the Property.

     4.05 CONSENTS AND PREFERENTIAL RIGHTS. Seller represents that at or prior
to Closing all material consents, and approvals of all persons required to
permit the transfer of the Property and the consummation of the transactions
contemplated hereby and which consents or approvals, if not received, could have
a material adverse effect shall have been obtained, and all preferential
purchase rights to any portion of the Property shall have been waived, or the
time period for their exercise shall have expired without such exercise.

     4.06 REPRESENTATIONS AND WARRANTIES OF SELLER.

     (a)  Except for those issues that will be settled at or prior to Closing
          there is no suit, action, claim, investigation, arbitration,
          administrative proceeding, or inquiry by any person or entity or by
          any administrative agency or governmental body pending, or, to
          Seller's

<PAGE>

U.S. ENERGY CORP.
April 12, 2002
Page -7-

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

          knowledge, threatened against Seller which has or may materially and
          adversely affect its ability to consummate the transactions
          contemplated hereby.
     (b)  As of the Closing, Seller will not be in default under any material
          agreement or material obligation to which Seller is a party or by
          which Seller, the Property, or the related assets may be bound;
     (c)  As of the Closing there will be no suit, action, claim, investigation,
          arbitration, administrative proceeding, or inquiry of any kind or
          nature, by any person or entity or by any administrative agency or
          governmental body pending or, to the knowledge of Seller, threatened,
          against Seller or any third party (except for matters to be cleared at
          closing. Seller is not in default) which: (1) has materially and/or
          adversely affected or which would, or if decided against Seller, have
          a material and adverse effect on the Property or the related assets or
          the Buyer's right to receive proceeds from the production and sale of
          oil and gas produced there from, or (2) relates to any generation,
          treatment, storage, recycling, transportation, or disposal of any
          hazardous material, hazardous waste, hazardous waste constituent,
          hazardous or toxic substance, radioactive material, flammable
          explosive, contaminant, pollutant, or any other substance dangerous to
          health, safety, or the environment (herein referred to as "HAZARDOUS
          MATERIALS"); (
     d)   To the knowledge of Seller, all laws, regulations, and orders of all
          governmental agencies that have jurisdiction over the Property and
          related assets have been complied with in all material respects;
     (e)  Seller has done no act or thing whereby any of its interest in and to
          the Property and related assets attributable thereto may be canceled
          and the Property and related assets attributable thereto are now, or
          will be at the Closing Date free and clear of all liens, encumbrances,
          adverse claims, demands, and royalties or other interests created by,
          through, or under Seller.
     (f)  Seller has not entered into ay contract or other agreement to deliver
          oil or gas produced from the Property at some future time, including
          any contract for the sale of oil or gas, any contract containing a
          "take or pay" or similar provision or any contract providing for a
          production payment, other than what may be provided for herein.
          Except for
<PAGE>

U.S. ENERGY CORP.
April 12, 2002
Page -8-

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

          contracts listed on Exhibit "A", Seller has not entered into any
          contracts.

     (g)  Seller has paid all ad valorem, property, production, severance,
          excise, and similar taxes and assessments based or measured by the
          ownership of property or the production of hydrocarbons or the receipt
          of proceeds there from on the Property which have become due and
          payable prior to the Effective Date.

     (h)  The oil and gas leases described in Exhibit "A": (1) are in full force
          and effect; (ii) are current with respect to payments or sums owed;
          (iii) Seller, to its knowledge, is not in default and no events have
          occurred, which, with the giving of notice or the passage of time, or
          both, could cause an event of default;

                                   ARTICLE V.
                                     CLOSING

     5.01 DATE OF CLOSING. Subject to the conditions stated in this Agreement,
the consummation of the transaction contemplated hereby (herein called the
"Closing") shall be held on May 27, 2002, or as provided in Article 5.02 below.

     5.02 EXTENSION OF CLOSING. At the sole option of Buyer, the Closing may be
extended a maximum of four (4) weeks from May 27, 2002, provided, however, that
Buyer pays Seller, by cashier's check or wire transfer, the non-refundable sum
of $50,000 per week, such payments to become credits against the balance due at
Closing. Such weekly fee to be paid, if at all, $50,000 on or before May 24,
2002; May 31, 2002; June 7, 2002 and June 14, 2002. Time shall be the essence of
this Article 5.02 and the weekly payment shall have been received by Seller on
or before the dates stated.

     5.03 PLACE OF CLOSING. The Closing shall be held at the offices of the
Seller's counsel located at 50 East Loucks Street, Sheridan, Wyoming, or at such
other place as the parties may mutually agree upon.

<PAGE>

U.S. ENERGY CORP.
April 12, 2002
Page -9-

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

     5.04 DOCUMENTS FOR CLOSING. At the Closing, the following events shall
occur:

          a) Seller shall execute, acknowledge and deliver Assignments, Bill(s)
     of Sale and Conveyances, conveying title to, or Seller's rights in and to
     the Property to Buyer or its assignee, in accordance with this Agreement.

          b) Seller will deliver to Buyer all properly executed change of
     operator forms for all of the Property described in Exhibit "A".

          c) Buyer shall deliver the cash balance of the Purchase Price to
     Seller by cashier's check or wire transfer payable to Seller and Buyer
     shall deliver a properly issued Certificate for the shares in U.S. Energy
     Corp. as are described in Article 2.02.c., above.

          d) A detailed list of personal property/equipment on the Bobcat
     Project covered by the Assignments, Bill(s) of Sale and Conveyances.

5.05 PAYMENTS AT CLOSING. At Closing, the Seller shall pay or cause to be paid
all amounts due from the Seller to third parties for any and all equipment, work
or services performed relating to the Property as of the Effective Time. The
Property shall be conveyed at Closing free and clear of all liens and
encumbrances.

5.06 REPRESENTATION BY SELLER AT CLOSING. At Closing, the Seller shall represent
and warrant to the Buyer that the Property shall be conveyed free and clear of
all liens and encumbrances and that all permits and rights issued to the Seller
by any governmental or regulatory agency with respect to the Property shall be
effective and in good standing as of the Closing.

<PAGE>

U.S. ENERGY CORP.
April 12, 2002
Page -10-

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

                                   ARTICLE VI.
                            OBLIGATIONS AFTER CLOSING

     6.01     INDEMNIFICATION.

          a) Buyer shall indemnify and save and hold Seller harmless against all
     claims, costs, expenses, liabilities and attorney fees with respect to the
     Property, which have accrued or relate to times after the Effective Date,
     including but not limited to plugging and abandonment of all existing
     wells.

          b) Seller shall indemnify and save and hold the Buyer harmless against
     all claims, costs, expenses, liabilities and attorney fees with respect to
     the Property which have accrued or relate to times prior to the Effective
     Date.

          c) Seller agrees that Buyer shall be entitled to receive all proceeds
     attributable to the Property after the Effective Date.

          d) Buyer agrees that Seller is entitled to receive all proceeds
     attributable to the Property prior to the Effective Date.

     6.02 SURVIVAL. The representations, warranties, covenants, agreements and
indemnities including or provided in this Agreement, or in any other instrument
delivered pursuant hereto, shall survive the Closing.

                                  ARTICLE VII.
                                  MISCELLANEOUS

     7.01 Except as otherwise specifically provided in this Agreement, all
notices and communications required or permitted under this Agreement shall be
in writing and any communication or delivery hereunder shall be deemed to have
been duly made if actually delivered, or if sent by Federal Express or other
overnight delivery, pre-paid, addressed as follows:

<PAGE>

U.S. ENERGY CORP.
April 12, 2002
Page -11-

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                  If to Buyer:

                           U.S. ENERGY CORP.
                           ATTN: KEITH LARSEN - PRESIDENT
                           877 North 8th West
                           Riverton, WY 82501

                                        -and-

                           ROCKY MOUNTAIN GAS, INC.
                           ATTN: PETE SCHOONMAKER - PRESIDENT
                           1 East Alger, Suite 206
                           Sheridan, WY 82801

                  If to Seller:

                           BIG BASIN PETROLEUM, LLC
                           ATTN: MATT MURPHY - MANAGING MEMBER
                           3105 East 2nd Street
                           P.O. Box 1581
                           Gillette, WY 82717

                  With copy to:

                           DAN B. RIGGS
                           Lonabaugh and Riggs
                           50 East Loucks, Street, Suite 110
                           P.O. Drawer 5059
                           Sheridan, WY 82801

                           STEVE RICHMOND
                           U. S. Energy Corp.
                           877 N. 8th West
                           Riverton, WY  82501

<PAGE>

U.S. ENERGY CORP.
April 12, 2002
Page -12-

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Either party may, by written notice so delivered to the other, change the
address to which delivery shall thereafter be made.

     7.02 GOVERNING LAW. This Agreement and the transactions contemplated hereby
shall be construed in accordance with, and governed by, the laws of the State of
Wyoming.

     7.03 ENTIRE AGREEMENT. This Agreement (including the Exhibit hereto)
constitutes the entire understanding between the parties with respect to the
subject matter hereof, superceding all negotiations, prior discussions and prior
agreements and understandings related to such subject matter.

     7.04 TIME. Time is of the essence for performance under this Agreement.

                                       BIG BASIN PETROLEUM, LLC

                                       By:    /s/   Matt B. Murphy
                                           -------------------------------------
                                            MATT B. MURPHY - MANAGING MEMBER

     The within and foregoing Agreement is accepted by the undersigned Buyer on
the ____ day of April, 2002.

                                              U.S. ENERGY CORP.

                                       By:    /s/   Keith G. Larsen
                                           -------------------------------------
                                           KEITH G. LARSEN - PRESIDENT

                                              ROCKY MOUNTAIN GAS, INC.

                                       By:    /s/   Peter G. Schoonmaker
                                           -------------------------------------
                                           PETER G. SCHOONMAKER - PRESIDENT

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