Document:

<PAGE>   1

                                                                   EXHIBIT 10.22

                                DEED OF RELEASE

                                    between

                              IVANHOE ENERGY INC.

                                      and

                           KUBAN PETROLEUM LTD. (BVI)

                                      and

                               TYUMEN OIL COMPANY

                                      and

                                 TYUMENNEFTEGAZ

                                August 10, 2000

                                       E-45
<PAGE>   2

This DEED OF RELEASE is made on August lo,2000 by and between:

     (1)   Joint Stock Company Tyumen Oil Company, a company organized and
           existing under the laws of the Russian Federation with its registered
           office at 67 Lenina Ulitsa, Tyumen, 625000, the Russian Federation
           ("TOC");

     (2)   Joint Stock Company Tyumenneftegaz, a company organized and existing
           under the laws of the Russian Federation with its registered office
           at 67 Lenina Ulitsa, Tyumen, 625000, the Russian Federation ("TNG");

     (3)   Ivanhoe Energy Inc., a company organized and existing under the laws
           of Canada with its registered office at Suite 300, 204 Black Street,
           Whitehorse, Yukon, Y1A 2M9 Canada ("Ivanhoe"); and

     (4)   Kuban Petroleum Ltd, a company organized and existing under the laws
           of the British Virgin Islands whose registered office is at Columbus
           Center Building, Wickhams Cay, Tortola, British Virgin Islands
           ("Kuban").

WHEREAS:

     (A)   TOC controls a majority of the voting shares in TNG;

     (B)   Kuban, an affiliate of Ivanhoe, owns a 100% interest in each of Great
           Plains Petroleum (Cyprus) Limited ("Great Plains") and Global
           Petroleum (Cyprus) Limited ("Global"). Global owns 50% of the shares
           in ZAO Radonezh Petroleum, a company organized and existing under the
           laws of the Russian Federation ("Radonezh");

     (C)   By Agreement of even date herewith ("the Share Purchase Agreement"),
           Kuban has agreed to sell its shares in Great Plains and Global to
           Stesana Enterprises Limited;

     (D)   By Notice of Arbitration and Preliminary Statement of Claim dated
           June 11, 1999 Great Plains initiated arbitration proceedings ("the
           Proceedings") against TNG in Stockholm, Sweden, in connection with
           the affairs of ZAO Tura Petroleum ("Tura"). Great Plains and TNG own
           50% each of the shares in Tura;

     (E)   It is a condition to Closing of the Share Purchase Agreement that the
           Parties enter into this Deed of Release.

IT IS AGREED AS FOLLOWS

ARTICLE 1. DEFINITIONS

In this Deed of Release, the following terms shall have the following meanings:

"TOC GROUP" shall mean TOC, TNG and each of their past direct or indirect
subsidiaries, officers, directors and employees (until such entities or
individuals ceased to be a subsidiary, officer, director or employee of TOC
and/or TNG), present shareholders, subsidiaries, indirect or direct affiliates,
successors and assigns and each of their respective present officers directors
and employees and future direct and indirect subsidiaries, officers, directors
and employees for a period of 3 years from the date hereof, including Global,
Great Plains, Tura and Radonezh.

"IVANHOE GROUP" shall mean Ivanhoe, Kuban and each of their past direct or
indirect subsidiaries, officers, directors and employees (until such entities or
individuals ceased to be a subsidiary, officer, director or employee of Ivanhoe
and Kuban), present shareholders, subsidiaries, indirect or direct affiliates,
successors and assigns and each of their respective present officers directors
and employees and future direct and indirect subsidiaries, officers, directors
and employees for a period of 3 years from the date hereof, except Great Plains,
Global, Radonezh and Tura.

"MEMBER" shall mean, when used in connection with the TOC Group or the Ivanhoe
Group a person and/or a legal entity being part of such group.

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<PAGE>   3

"PARTIES" shall mean TOC, TNG, Ivanhoe and Kuban with each individually referred
to as a "Party".

"WARRANTY" means the representations and warranties contained in section 2.3,
3.5 and 3.6 and any other representation and warranty made herein by or on
behalf of the Parties to this Deed of Release.

ARTICLE 2. RELEASES, DISCHARGES AND WAIVERS

2.1. With effect from the date hereof and in consideration of the Parties'
mutual release and waiver and causing such releases and waivers to apply with
respect to the respective Party's Group in favor of each other:

     (a)   Ivanhoe and Kuban hereby agree to, and agree to procure that the
           Ivanhoe Group, release, forever discharge, and waive their right to
           pursue any claim howsoever arising against, TNG, TOC and the TOC
           Group from and in respect of all, and all manner of, actions and
           claims, in law or in equity, which are, were or could have been
           asserted as of the date of this Deed of Release, irrespective of
           whether or not such actions or claims are presently known or unknown,
           formally notified, brought or commenced, and which in any way relate
           to Tura, its business and the relationship and dealings between the
           Ivanhoe Group and the TOC Group in the context of Tura's business and
           affairs to the date hereof and/or the Proceedings; provided that this
           paragraph shall not release TOC and TNG from any of their obligations
           under this Deed of Release; and

     (b)   TOC and TNG hereby agree to, and agree to procure that the TOC Group,
           release, forever discharge, and waive their right to pursue any claim
           howsoever arising against, Ivanhoe, Kuban and the Ivanhoe Group from
           and in respect of all, and all manner of, actions and claims, in law
           or in equity, which are, were or could have, been asserted as of the
           date of this Deed of Release, irrespective of whether or not such
           actions or claims are presently known or unknown, formally notified,
           brought or commenced, and which in any way, relate to Tura, its
           business and the relationship and dealings between the Ivanhoe Group
           and the TOC Group in the context of Tura's business and affairs to
           the date hereof and/or the Proceedings; provided that this paragraph
           shall not release Ivanhoe and Kuban from any of their obligations
           under this Deed of Release;

2.2. To the extent that any proceedings have been commenced by a member of
either the TOC Group or the Ivanhoe Group against a member of the other Group in
any court or forum in respect of or arising out of the events or matters set out
herein, it is agreed that (a) for the avoidance of doubt the releases, waivers
and discharges set out in Article 2.1 shall apply to such proceedings and (b)
the party that has commenced such proceedings shall at its own expense take all
steps necessary to terminate such proceedings and to withdraw all and any claims
asserted therein without liability to the remaining party.

2.3. Each of the Parties represents and warrants to the others that (a) no
actions, causes of actions, suits, claims or demands in law or in equity have
previously been assigned by said Party or by any other member of said Party's
Group to any other person, partnership or entity which if such matter had not
been assigned, would have been released and discharged pursuant to this Deed of
Release, and (b) said Party is unaware of any actions, causes of actions, suits,
claims or demands in law or in equity which said Party, or any of its affiliates
may have against the others which is not subject to the provisions of Section
2.1.

2.4. The Parties acknowledge that a breach or breaches of the provisions of this
Clause 2 by one or more of the Parties may result in substantial damage to the
business of other Parties and that such breach or breaches may entitle such
other parties to payment of damages to compensate them for losses resulting from
such breach or breaches.

2.5. Nothing in this Deed of Release or in any other agreements, negotiations or
actions connected with it shall be construed as an acceptance by TOC and TNG of
the jurisdiction of the arbitral tribunal in Stockholm (the "Tribunal") with
regard to the Proceedings or a waiver of TNG's objections thereto.

                                       E-47
<PAGE>   4

ARTICLE 3. WARRANTIES

3.1. Each of TOC and TNG represents and warrants to each of Ivanhoe and Kuban
and each of Ivanhoe and Kuban represents and warrants to each of TOC and TNG,
that each of the Warranties made by it is true, accurate, complete and not
misleading at the date of this Deed of Release.

3.2. Each of the Parties acknowledges that the other Party is entering into this
Deed of Release in reliance on each Warranty which has also been given as a
representation and with the intention of inducing the other Party to enter into
this Deed of Release.

3.3. Each of the Warranties shall be construed as a separate and independent
warranty and shall be limited and restricted by reference to the terms of each
respective Warranty and the Warranties shall survive the execution of this Deed
of Release.

3.4. The rights and benefits of or under the Warranties may be assigned
(together with any cause of action arising in connection with any Warranty) by
the Parties to their successors in title or to any member of their respective
Group.

3.5. Each of TOC and TNG represent and warrant to each of Ivanhoe and Kuban
that:

     (a)   it is duly organized and validly existing under the laws of the
           Russian Federation;

     (b)   it has the right, power and authority and has taken all action
           necessary to validly execute and deliver, and to exercise its rights
           and perform its obligations under this Deed of Release, and that the
           individuals signing this Deed of Release on behalf of TOC and TNG are
           duly authorized to do so;

     (c)   its respective obligations under this Deed of Release will be
           enforceable in accordance with their terms;

     (d)   the choice of law and the arbitration clause hereunder are valid and
           binding on each of TOC and TNG.

3.6. Each of Ivanhoe and Kuban represent and warrant to each of TOC and TNG
that:

     (a)   it is duly organized and validly existing under the laws of its
           jurisdiction;

     (b)   it has the right, power and authority and has taken all action
           necessary to validly execute and deliver, and to exercise its rights
           and perform its obligations under this Deed of Release, and that the
           individuals signing this Deed of release on behalf of Ivanhoe and
           Kuban are duly authorized to do so;

     (c)   its respective obligations under this Deed of Release will be
           enforceable in accordance with their terms;

     (d)   the choice of law and the arbitration clause hereunder are valid and
           binding on each of Ivanhoe and Kuban.

ARTICLE 4. ANNOUNCEMENT, CONFIDENTIALITY

4.1. The Parties shall sign at the time of Closing of the Share Purchase
Agreement a pre-agreed text of a joint Press Release. Save for such Press
Release, the Parties agree that the terms and conditions of this Deed of Release
and any and all other information relating to the Proceedings, and the Share
Purchase Agreement shall remain confidential for a period of twelve (12) months,
except as required by law and/or applicable stock exchange rules. During this
period such information shall not be disclosed by either Party to any third
party, including but not limited to subsidiaries, affiliates, officers,
directors, and employees of such entities, or any unauthorized person without
the prior written consent of TOC or Ivanhoe, respectively, which consent shall
not be unreasonably withheld, unless and to the extent such disclosure is
required for a proper fulfillment of the Parties' obligations arising out of
this Deed of

                                       E-48
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Release or if such information is already publicly known or if a Party or the
Parties are legally obliged to disclose such information.

ARTICLE 5. GOVERNING LAW AND ARBITRATION

5.1. This Deed of Release shall be governed by the substantive law of England
and Wales.

5.2 Any dispute, controversy or claim arising out of or in connection with this
Deed of Release, or the breach, termination or invalidity thereof, shall be
finally settled by arbitration in accordance with the Rules of the Arbitration
Institute of the Stockholm Chamber of Commerce.

     The Tribunal shall be composed of three arbitrators;

     The place of arbitration shall be Stockholm, Sweden;

     The arbitral proceedings shall be conducted in both English and Russian
     languages.

ARTICLE 6. MISCELLANEOUS

6.1. This Deed of Release shall not in any way be construed as an admission by
any of the Parties of any wrongful or illegal act against the other or any other
person, partnership or entity. Neither shall it be construed as an implicit or
explicit recognition or admission of any current or past claims by any Party.

6.2. This Deed of Release may be executed in any number of counterparts, each of
which shall be an original, but such counterparts shall constitute one and the
same instrument,

6.3. In connection with entering into this Deed of Release the Parties shall
deliver to each other the following legal opinions:

     (a)   the opinion of Goodman Phillips & Vineberg, a Canadian legal counsel
           for Ivanhoe, attesting to:

           (i)    the due organization and good standing of Ivanhoe; Ivanhoe's
                  corporate power and authority and taking of necessary
                  corporate actions to authorize its execution, delivery and
                  performance of this Deed of Release, and the due authorization
                  of the individual(s) executing this Deed of Release on behalf
                  of Ivanhoe;

           (ii)   its conclusion that no licenses, approvals, consents, filings
                  or registrations of any governmental authority are required
                  for the due execution, delivery or performance by Ivanhoe of
                  this Deed of Release; and

           (iii)  its conclusion the choice of governing law and arbitration
                  clause in this Deed of Release are valid and binding on
                  Ivanhoe.

     (b)   the opinion of Harney Westwood & Riegels, British Virgin Islands
           legal counsel for Kuban, attesting to:

           (i)    the due organization and good standing of Kuban; Kuban's
                  corporate power and authority and taking of necessary
                  corporate actions to authorize its execution, delivery and
                  performance of this Deed of Release; and the due authorization
                  of the individual(s) executing this Deed of Release on behalf
                  of Kuban;

           (ii)   its conclusion the choice of governing law and arbitration
                  clause in this Deed of Release are valid and binding on Kuban;

           (iii)  its conclusion that no licenses, approvals, consents, filings
                  or registrations of any governmental authority are required
                  for the due execution, delivery or performance by Kuban of
                  this Deed of Release.

                                       E-49
<PAGE>   6

     (c)   the opinion of White & Case LLC, attesting to:

           (i)    TOC and TNG's corporate power and authority and taking of
                  necessary corporate actions to authorize its execution,
                  delivery and performance of this Deed of Release; and the due
                  authorization of the individual(s) executing this Deed of
                  Release on behalf of each TOC and TNG;

           (ii)   its conclusion that no licenses, approvals, consents, filings
                  or registrations of any governmental authority are required
                  for the due execution, delivery or performance by each of TOC
                  and TNG of this Deed of Release.

           (iii)  its conclusion the choice of governing law and arbitration
                  clause in this Deed of Release is valid and binding on each of
                  TOC and TNG;

6.4. Any notice, request or other communication to be given or made under this
Deed of Release by one Party to other Party or Parties shall be in writing. The
notice, request or other communication may be delivered by hand, airmail,
facsimile or established courier service to the Party's address specified below
or at such other address as such Party notifies to the other Parties from time
to time and will be effective upon receipt or, in the case of delivery by hand
or by established courier service, upon refusal to accept delivery.

    For TOC:

    18 Schipok Street, Building 2, 113093, Moscow, Russia

    Alternative address for communications by fax:  (095) 959-74-13

    For TNG:

    67 Lenina Street, 62530 Tyumen, Russia

    Alternative address for communications by fax:  (3452) 465011

    For Ivanhoe:

    9th Floor, Waterfront Centre, 200 Burrard Street, Vancouver, B.C. V6C 3L6,
    Canada

    Alternative address for communications by fax: 81-3-3947-53 19, attention:
    Beverly Dowing

    For Kuban:

    9th Floor, Waterfront Centre, 200 Burrard Street, Vancouver B.C. V6C 3L6,
    Canada

    Alternative address for communications by fax: 16046827 131, Tel:
    1604682773 7, attention: Goodman Phillips & Vineberg, 1900 - 355 Burrard
    Street, Vancouver, V6C 2G8, Canada

In the absence of evidence of earlier receipt, a notice or other communication
is deemed given:

     (a)   if delivered personally, when left at the address referred to in
           section 5.4;

     (b)   if sent by mail except air mail, twelve days after posting it;

     (c)   if sent by air mail, six days after posting it;

     (d)   if sent by fax, on closing of its transmission.

6.5. TOC and TNG expressly represent and warrant that execution of the Deed of
Release requires a resolution of their respective Board of Directors. Therefore,
each of TOC and TNG undertake to deliver as soon as it is practically possible
but in no event later than 45 days from the date of this Deed of Release to each
of Ivanhoe and Kuban certified as true copies of the duly adopted resolutions of
their duly appointed Board of Directors duly ratifying execution of this Deed of
Release as of the date thereof.

                                       E-50
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This Agreement has been executed as a Deed in FOUR copies each of which shall be
deemed an original and each of the Parties retains one such original.

IVANHOE ENERGY INC.

By:       /s/ MATTHEW LECHTZIER
   -----------------------------------
            Matthew Lechtzier

KUBAN PETROLEUM LTD.

By:       /s/ MATTHEW LECHTZIER
   -----------------------------------
            Matthew Lechtzier

TYUMEN OIL COMPANY

By:       /s/ IGOR V. MAYDANNIK
   -----------------------------------
            Igor V. Maydannik

TYUMENNEFTEGAZ

By:    /s/ ALEXANDRE O. TCHIVILEV
   -----------------------------------
         Alexandre O. Tchivilev

                                       E-51<PAGE>   1

                                                                   EXHIBIT 10.23

                             AGREEMENT TO PURCHASE

THIS AGREEMENT, entered into as of January 26, 2001, between William R. Berry II
and Deborah M. Olson (herein collectively the "SELLER") and Ivanhoe Energy (USA)
Inc. ("IVANHOE"), a corporation organized under the laws of the State of Nevada
(d.b.a. USA Ivanhoe Inc. in California). Seller and Purchaser are sometimes
individually referred to herein as a "Party" and collectively as the "Parties".

Ivanhoe and Seller have agreed that Ivanhoe, or a designated affiliate, (the
"PURCHASER") would acquire from Seller, and Seller would sell to Purchaser, all
of the issued and outstanding shares of capital stock of Digital Petrophysics,
Inc., a California corporation ("DPI"), subject to the terms and conditions
herein specified.

1.   STOCK PURCHASE AGREEMENT

A.   The Parties shall promptly prepare, negotiate and execute a mutually
     agreeable Stock Purchase Agreement for the purchase by Purchaser of all of
     the issued and outstanding capital stock of DPI ("DPI STOCK"). The Stock
     Purchase Agreement will contain terms, representations, warranties and
     conditions normally found in such agreements. No such terms shall be
     inconsistent with the terms set out in this agreement. Except as provided
     in paragraph 1. B. herein, the Stock Purchase Agreement will also contain a
     provision that Seller will not obtain overriding royalty ("ORRI") or other
     interests in competition with Purchaser in areas described in the
     "Enclosure A Lost Hills Deep Prospect AMI" to the January 18th 1999 "First
     Amendment and Clarification of Provisions", to the "Diatom/Aera Exploration
     Agreement dated May 1, 1998", below the base of the MacDonald Shale.

B.   For disclosure purposes only, Seller represents that DPI may presently own
     certain rights to interests in oil and gas leases that were outside of the
     working interest partners' interest in the Almond Flank Participation
     Agreement, dated August 1, 1996 ("AFPA"), AMI at the time leases were
     taken. These interests, if any, will be assigned out of DPI prior to the
     sale of the DPI Stock to Purchaser. The value of these interests is
     therefore not included in the sale price of this transaction. This
     Agreement is not intended to abridge or limit Seller's existing rights to
     these interests in leases taken by non-parties to the AFPA, that were not
     subject to the working interest partners' interest in the AFPA and were
     outside of the working interest partners' interest in the AFPA, AMI at the
     time they were taken. All such rights are expressly reserved, without
     limitation, to Seller.

C.   The Parties will endeavor to conclude the Stock Purchase Agreement by
     February 15, 2001.

2.   CONSIDERATION FOR THE PURCHASE

The Purchase Agreement will provide that the consideration for the purchase of
the DPI Stock will be the following:

     A.    Seller shall receive Eight hundred thousand (800,000) duly authorized
           and issued shares of common stock of Ivanhoe Energy Inc. ("Ivanhoe
           Stock"); and

     B.    Seller shall receive an ORRI of twenty-five one-hundredths of one
           percent (0.25%) in areas below the MacDonald Shale in (i) areas under
           existing leases which have been taken by or assigned to the working
           interest partners in the Almond Flank AMI, (comprising approximately
           1,503 net acres as set forth on exhibit "A"), in which DPI is
           currently entitled to ORRI, and (ii) in the 592 net acres (set forth
           on exhibit "B"), in which Ivanhoe previously acquired ORRI in the
           purchase of Digital Petrophysics Resources, Inc., pursuant to the
           Stock Purchase Agreement, dated September 3, 1999.

     C.    Seller shall cause to be assigned, sold, or otherwise conveyed,
           granted or transferred out of DPI, to Seller or Seller's designee,
           prior to the sale of DPI Stock to Purchaser all assets currently
           owned by DPI with the exception of those interests identified in
           exhibit "A". The

                                       E-52
<PAGE>   2

           Parties agree that only those interests of DPI identified in exhibit
           "A" shall be the sole remaining assets of DPI at the time of the
           Closing of the stock sale transaction. Purchaser expressly agrees
           that the consideration paid under this purchase agreement is only for
           those interests identified in exhibit "A" and do not include any
           interests which are not otherwise identified in this Agreement or are
           expressly reserved or excluded from this transaction.

     D.    Nothing in this Agreement shall constitute a non-competition
           agreement governing or restricting either Seller's right to engage in
           any professional consulting services on behalf of any other entity.
           Seller shall be free to accept or decline any consulting engagement
           with any entity without notice or limitation to Purchaser.

     E.    Purchaser further agrees that in the event that an oil and gas lease
           with Texaco pertaining to rights above the base of the McDonald Shale
           covering the lands referenced in that Oil and Gas lease by and
           between Texaco and West Best Resources, Ltd. dated June 26th 1999 as
           recorded in the official records of the County of Kern document #
           0200057248, is taken by either Purchaser or Aera Energy LLC, in which
           Purchaser has any beneficial interest, then Purchaser shall assign to
           Seller an ORRI of the difference between the existing burdens at the
           time the lease is acquired and 23.5% as it pertains to the leased
           lands, but in any event not less than 2%. Should Purchaser or any
           other party negotiate a renewal lease covering the same land
           described in exhibit "A" or "B" in which Purchaser has any beneficial
           interest, then Purchaser shall assign to Seller the same ORRI as
           Seller would have been entitled to under the previous lease, as such
           lease pertains to the land from the surface down to the base of the
           MacDonald Shale, and as such lease pertains to the land below the
           base of the MacDonald Shale.

     F.    Purchaser further agrees to provide a copy of all logs, (including
           but not limited to mud logs, wireline logs and all measurements made
           while drilling), reports, (including well histories and daily
           drilling reports) and studies, if any, from the surface to the base
           of the MacDonald Shale, on any well drilled on acreage in the AFPA,
           AMI which Seller has received and enjoys ORRI interests.

3.  CLOSING OF PURCHASE

The Closing of the sale and purchase of the DPI stock ("Closing") will take
place within three (3) business days of the satisfaction of the conditions to
Closing specified in the Stock Purchase Agreement, including approval by the
Toronto Stock Exchange of the listing of the Ivanhoe Stock to be given as
consideration for the purchase. The specific terms and conditions of the Stock
Purchase Agreement shall be subject to the approval of Seller's tax consultants,
prior to Closing. The Parties agree that they shall mutually cooperate to ensure
that, to the highest extent practicable, this transaction meets the requirements
of IRC section 1031, for a tax deferred exchange treatment.

4.  DISPUTE WITH AERA

Pending conclusion of the Stock Purchase Agreement and the Closing, Seller will
not permit or cause DPI to continue demands upon Aera Energy LLC and/or Ivanhoe
in respect of the dispute concerning the AFPA, AMI arising out of the AFPA or
the rights to ORRI in leases in the AFPA, AMI. It will be a condition to the
Closing, that Seller releases Ivanhoe and Aera from any and all claims arising
and liabilities out of the AFPA and ORRI thereunder, except with respect to the
ORRI referred to in Paragraph 2.B. above.

5.  MISCELLANEOUS

This Letter of Intent shall be governed by the laws of the State of California,
excluding provisions of law that would refer the matter to the laws of another
jurisdiction.

                                       E-53
<PAGE>   3

IN WITNESS WHEREOF, Seller and Purchaser have caused this Agreement to be
executed as of the day and year first above written.

SELLER:

<TABLE>
<S>                                                <C>

          /s/ WILLIAM R. BERRY II                              /s/ DEBORAH M. OLSON
--------------------------------------------       --------------------------------------------
            William R. Berry II                                  Deborah M. Olson
</TABLE>

PURCHASER:
IVANHOE ENERGY (USA) INC.
d.b.a. USA Ivanhoe Energy Inc. in California

by: /s/ OSCAR A. BLAKE
    -------------------------------------------------------
    Oscar A. Blake, Vice President

                                       E-54
<PAGE>   4

                                   EXHIBIT A

                        RIGHTS TO ORRI'S FOR SALE BY DPI
            NOTE: ALL ROYALTIES LIMITED TO BELOW BASE McDONALD SHALE
<TABLE>
<CAPTION>

                  FOC                                                               INTEREST   GROSS      NET        DATE
TWP   RNG   SEC    #     DESCRIPTION            LESSOR              LESSEE             %       ACRES     ACRES      SIGNED
---   ---   ---   ----   -----------            ------              ------          --------   -----   ---------   --------
<C>   <C>   <C>   <C>    <S>                    <C>                 <C>             <C>        <C>     <C>         <C>
25    20    21           1 SE/4 of NE/4         Texaco              Ivanhoe            100       40       40.000    4/15/99
25    20    21           3 NE/4 of NE/4         Tuttle, Oliver D    Fuller/Ivanhoe      85     40.1       34.068    2/16/99
25    20    21           3 NE/4 of NE/4         Tuttle, Carmelo V   Fuller/Ivanhoe      10     40.1        4.008    2/16/99
25    20    21           3 NE/4 of NE/4         Tuttle, Steven M    Fuller/Ivanhoe       1     40.1        0.401    3/10/99
25    20    21           3 NE/4 of NE/4         Bailey, Suzanne M.  Fuller/Ivanhoe       1     40.1        0.401    6/28/99
25    20    21           3 NE/4 of NE/4         Luna, Laura Lee     Fuller/Ivanhoe       1     40.1        0.401    3/31/99
25    20    21           4 W/2 of NE/4          Cronin, John        Fuller/Ivanhoe    26.4       80       21.120    1/14/99
25    20    21           4 W/2 of NE/4          Denson TR           Fuller/Ivanhoe   19.42       80       15.536     4/8/99
25    20    21           4 W/2 of NE/4          Texaco              Ivanhoe             50       80       40.000    4/15/99
25    20    21           5 E/2 of SE/4          Enron               Aera               100       80       80.000   11/23/99
25    20    21           6 W/2 of SE/4          Texaco              Ivanhoe             10       80        8.000    4/15/99
25    20    22           9 SW/4 of SW/4         Enron               Aera               100       40       40.000   11/23/99
25    20    22     9a      S/2exclSW/4 SW/4     Enron               Aera               100      280      280.000   11/23/99
25    20    28           27 NW/4                Texaco (pri)        Ivanhoe            100      160       160.00     8/1/00
25    20    17           18 W 50 acres NE/4     Texaco              Ivanhoe            100       50       50.000    4/15/99
25    20    17           21 ptn SE/4 NE/4       Miller Cameron      Fuller/Ivanhoe     100       25       25.000    3/10/99
25    20    16           25 NW/4                Texaco              Ivanhoe            100      160      160.000    4/15/99
25    20    16           26 SE/4                Hogerheide          Fuller/Ivanhoe   16.67      160       26.672     1/5/99
25    20    16           26 SE/4                Heather, Thomas     Fuller/Ivanhoe   16.67      160       26.672    1/21/99
25    20    16           26 SE/4                Windbegler          Fuller/Ivanhoe      25      160       40.000    12/7/98
25    20    16           26 SE/4                Heather, Alice      Fuller/Ivanhoe   16.67      160       26.672    1/25/99
25    20    16           26 SE/4                Eads, William       Fuller/Ivanhoe    12.5      160       20.000    12/3/98
25    20    16           26 SE/4                Eads, John          Fuller/Ivanhoe    12.5      160       20.000    12/9/98
25    20    22           33 NW4                 Texaco(a)           Ivanhoe            100      160      160.000    4/15/99
25    20     5           34 N/2 of SW/4         Swenson etal        Fuller/Ivanhoe      50       80       40.000     1/1/99
25    20    17           19 PTN NE/4            Stoner, Wilma       Fuller/Ivanhoe   16.67       50        8.335    1/20/00
25    20    17           19 PTN NE/4            Howard, Susan       Fuller/Ivanhoe   33.33       50       16.665    2/10/00
25    19     1           77 NE/4                BLM CA40629         Fuller/Ivanhoe     100      159      159.200    7/20/99
                                                                                                       ---------
                         TOTAL                                                                         1,503.150
                                                                                                       =========

<CAPTION>
                                                                             ORRI    ORRI               AC%
                                                       OIRG ISE   ALM FLNK   2WRB    SOLD     AC%       2WRB
       DATE      BASE      DPI    ROYALTY     TOTAL     DEPTH       AMI        &      TO      SOLD       &
TWP  RECORDED   ROYALTY   ORRI    PERCENT    ROYALTY    LIMIT      STATUS     DMO     IE     TO IE      DMO
---  --------   -------   -----   --------   -------   --------   --------   -----   ----   --------   ------
<C>  <C>        <C>       <C>     <C>        <C>       <C>        <C>        <C>     <C>    <C>        <C>
25    6/9/99    20.000    3.500    140.00     23.50     NONE       Primary   0.25    3.25     130.00    10.00
25   4/20/99    16.667    6.833    232.79     23.50     NONE       Primary   0.25    6.58     224.27     8.52
25   4/20/99    16.667    6.833     27.39     23.50     NONE       Primary   0.25    6.58      26.38     1.00
25   4/20/99    16.667    6.833      2.74     23.50     NONE       Primary   0.25    6.58       2.64     0.10
25   7/30/99    16.667    6.833      2.74     23.50     NONE       Primary   0.25    6.58       2.64     0.10
25   4/20/99    16.667    6.833      2.74     23.50     NONE       Primary   0.25    6.58       2.64     0.10
25    2/5/99    16.670    6.830    144.25     23.50     NONE       Primary   0.25    6.58     138.97     5.28
25   7/30/99    16.670    6.830    106.11     23.50     NONE       Primary   0.25    6.58     102.23     3.88
25    6/9/99    20.000    3.500    140.00     23.50     NONE       Primary   0.25    3.25     130.00    10.00
25   12/29/99   21.500    2.000    160.00     23.50     NONE       Primary   0.25    1.75     140.00    20.00
25    6/9/99    20.000    3.500     28.00     23.50     NONE       Primary   0.25    3.25      26.00     2.00
25   12/29/99   21.500    2.000     80.00     23.50     NONE       Primary   0.25    1.75      70.00    10.00
25   12/29/99   21.500    2.000    560.00     23.50     NONE       Primary   0.25    1.75     490.00    70.00
25    6/9/99    20.000    3.500    560.00     23.50     basMcD     Primary   0.25    3.25     520.00    40.00
25    6/9/99    20.000    3.500    175.00     23.50     NONE       Primary   0.25    3.25     162.50    12.50
25   7/30/99    16.667    6.833    170.83     23.50     NONE       Primary   0.25    6.58     164.58     6.25
25    6/9/99    20.000    3.500    560.00     23.50     NONE       Primary   0.25    3.25     520.00    40.00
25   2/17/99    16.667    6.833    182.25     23.50     NONE       Primary   0.25    6.58     175.58     6.67
25    2/5/99    16.667    6.833    182.25     23.50     NONE       Primary   0.25    6.58     175.58     6.67
25    2/5/99    16.667    6.833    273.32     23.50     NONE       Primary   0.25    6.58     263.32    10.00
25   2/17/99    16.667    6.833    182.25     23.50     NONE       Primary   0.25    6.58     175.58     6.67
25    2/5/99    16.667    6.833    136.66     23.50     NONE       Primary   0.25    6.58     131.66     5.00
25    2/5/99    16.667    6.833    136.66     23.50     NONE       Primary   0.25    6.58     131.66     5.00
25    6/9/99    20.000    3.500    560.00     23.50     NONE       Primary   0.25    3.25     520.00    40.00
25    2/5/99    16.667    2.000     80.00     18.67     NONE       Second    0.25    1.75      70.00    10.00
25   9/11/00    16.667    6.833     56.95     23.50     NONE       Primary   0.25    6.58      54.87     2.08
25   9/11/00    16.667    6.833    113.87     23.50     NONE       Primary   0.25    6.58     109.71     4.17
25    8/1/99eff 12.500    2.000    318.40     14.50     NONE       Second    0.25    1.75     276.60    39.80
                                  --------                                                  --------   ------
                                  5,315.19                                                  4,939.40   375.79
                                  ========                                                  ========   ======
</TABLE>

                                       E-55
<PAGE>   5

                                   EXHIBIT B

                      ORRI PREVIOUSLY PURCHASED BY IVANHOE
<TABLE>
<CAPTION>

                  FOC                                                      INTEREST   GROSS    NET       DATE      BASE      DPR
TWP   RNG   SEC    #    DESCRIPTION                LESSOR                     %       ACRES   ACRES     SIGNED    ROYALTY    ORRI
---   ---   ---   ---   -----------                ------                  --------   -----   ------   --------   -------   ------
<C>   <C>   <C>   <C>   <S>                        <C>                     <C>        <C>     <C>      <C>        <C>       <C>
25    20     8    23    S/2, excluding W of        Union Bnk of Calif         100     250.8   250.76    9/10/96   16.667    6.8330
                        Aquaduct
25    20    16     7    SW/4, w of aquaduct        Buck, Robt. B.            4.17     124.6     5.19              16.667    6.8330
25    20    16     7    SW/4, w of aquaduct        Buck, C. B.               4.17     124.6     5.19              16.667    6.8330
25    20    16     7    SW/4, w of aquaduct        Lodato, Carol B.          4.17     124.6     5.19              16.667    6.8330
25    20    16     7    SW/4, w of aquaduct        Erdman, Christian P.      37.5     124.6    46.71    12/9/93   16.667    6.8330
25    20    16     7    SW/4, w of aquaduct        Buck, Leonard C. Z.       4.16     124.6     5.18              16.667    6.8330
25    20    16     8    SW/4, E of aquaduct        Buck, Robt. B.            4.17     35.45     1.48              16.667    6.8330
25    20    16     8    SW/4, E of aquaduct        Buck, C. B.               4.17     35.45     1.48              16.667    6.8330
25    20    16     8    SW/4, E of aquaduct        Lodato, Carol B.          4.17     35.45     1.48              16.667    6.8330
25    20    16     8    SW/4, E of aquaduct        Erdman, Christian P.      37.5     35.45    13.29    12/9/93   16.667    6.8330
25    20    16     8    SW/4, E of aquaduct        Buck, Leonard C. Z.       4.16     35.45     1.47              16.667    6.8330
25    20    17    17    N/2 of NW/4, SE/4 of NW/4  Reimers, Ann Burke          50      120     60.00    7/15/96   16.667    6.8330
25    20    17    17    N/2 of NW/4, SE/4 of NW/4  Booth, Franklin Otis        50      120     60.00    6/17/96   16.667    6.8330
25    20    17    17a   SW/4 of NW/4               Reimers, Ann Burke          50       40     20.00   12/17/97   16.667    6.8330
25    20    17    17a   SW/4 of NW/4               Booth, Franklin Otis        50       40     20.00    12/3/97   16.667    6.8330
25    20    17    20    Portion of SW/4 of NE/4    PRB Partnership          33.34     29.19     9.73   10/23/96   16.667    6.8330
25    20    17    20    Portion of SW/4 of NE/4    Arnold, Caroline A.      16.66     29.19     4.86   11/26/96   16.667    6.8330
25    20    17    20    Portion of SW/4 of NE/4    Phillips, Fred B.        16.66     29.19     4.86    11/1/96   16.667    6.8330
25    20    21     4    W/2 of NE/4                E. O. Miller Co.          4.18       80      3.34              16.667    6.8330
25    20    21     6    W/2 of SE/4                Waller, Rosalyn E        89.75       80     71.80   10/28/98   16.667    6.8330
                                                                                              ------
                                                                                              592.03
                                                                                              ======

<CAPTION>
                                                   AC%
     DPR AC%                RETAINED BY IVANHOE     TO
     BOT BY    ORRI BACK2   -------------------    WRB
TWP    IE      WRB & DMO    ROYALTY%   AC% KEPT   & DMO
---  -------   ----------   --------   --------   ------
<C>  <C>       <C>          <C>        <C>        <C>
25   1713.44      0.25       6.5830    1650.75     62.69
25    35.49       0.25       6.5830      34.19      1.30
25    35.49       0.25       6.5830      34.19      1.30
25    35.49       0.25       6.5830      34.19      1.30
25   319.14       0.25       6.5830     307.47     11.68
25    35.40       0.25       6.5830      34.11      1.30
25    10.10       0.25       6.5830       9.73      0.37
25    10.10       0.25       6.5830       9.73      0.37
25    10.10       0.25       6.5830       9.73      0.37
25    90.84       0.25       6.5830      87.51      3.32
25    10.08       0.25       6.5830       9.71      0.37
25   409.98       0.25       6.5830     394.98     15.00
25   409.98       0.25       6.5830     394.98     15.00
25   136.66       0.25       6.5830     131.66      5.00
25   136.66       0.25       6.5830     131.66      5.00
25    66.50       0.25       6.5830      64.07      2.43
25    33.23       0.25       6.5830      32.01      1.22
25    33.23       0.25       6.5830      32.01      1.22
25    22.85       0.25       6.5830      22.01      0.84
25   490.61       0.25       6.5830     472.66     17.95
     -------                           -------    ------
     4045.37                           3897.36    148.01
     =======                           =======    ======
</TABLE>

NOTE: DPI retained all royalty above base McDonald and assigned all rights below
base McD into DPR. Ivanhoe acquired DPR and all of its assets in exchange for
stock in Ivanhoe.

                                       E-56

Source: [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00021-of-00352.parquet"}, [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00021-of-00352.parquet"}]]