CHIEFTAIN INTERNATIONAL INC
8-K, 1999-11-16
CRUDE PETROLEUM & NATURAL GAS
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                         SECURITIES AND EXCHANGE COMMISSION
                               WASHINGTON, D.C. 20549

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

                                      FORM 8-K

                                   CURRENT REPORT

                         PURSUANT TO SECTION 13 OR 15(d) OF
                         THE SECURITIES EXCHANGE ACT OF 1934

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

         Date of Report (Date of earliest event reported): November 10, 1999


                            CHIEFTAIN INTERNATIONAL, INC.
               (Exact name of registrant as specified in its charter)


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


      ALBERTA, CANADA                  1-10216                     NONE
(State or other jurisdiction    (Commission File Number)     (I.R.S. Employer
     of incorporation)                                    Identification Number)


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


                                    1201 TD TOWER
                                  10088-102 AVENUE
                              EDMONTON, ALBERTA T5J 2Z1
                                       CANADA
                 (Address of principal executive offices) (Zip code)


         Registrant's telephone number, including area code: (780) 425-1950

                             1201 TORONTO DOMINION TOWER
                                   EDMONTON CENTRE
                                  EDMONTON, ALBERTA
                                       CANADA

            (Former name or former address, if changed since last report)


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ITEM 5. OTHER EVENTS

On November 10, 1999, Chieftain International, Inc. (the "Company") entered into
an underwriting agreement (the "Underwriting Agreement") with CIBC World Markets
Corp., Dain Rauscher Incorporated and A.G. Edwards & Sons, Inc., as the
representatives of the several underwriters named in Schedule I thereto, in
connection with the sale (the "Offering") by the Company of an aggregate of
2,500,000 common shares, no par value (the "Common Shares") of the Company (the
"Offered Shares"). An additional 375,000 Common Shares are subject to an
over-allotment option granted to the underwriters in the Underwriting Agreement.
A copy of the Underwriting Agreement is attached hereto as Exhibit 1 and is
incorporated herein by reference. The Offering is scheduled to close on
November 16, 1999.

The Offering is made pursuant to the Company's registration statement on
Form S-3 (File No. 333-88661) (the "Registration Statement") under the
Securities Act of 1933. The Registration Statement provides that the Company
may from time to time offer various of its debt and equity securities with
an aggregate public offering price of up to $300 million.

A copy of the Prospectus Supplement dated November 10, 1999, relating to the
Offered Shares and the accompanying Prospectus dated October 20, 1999, filed
pursuant to Rule 424(b)(2) under the Securities Act of 1933, is incorporated
herein by reference.

ITEM 7. Financial Statements and Exhibits

(c)  Exhibits

     1        Underwriting Agreement, dated November 10, 1999, among Chieftain
              International, Inc. and CIBC World Markets Corp., Dain Rauscher
              Incorporated and A.G. Edwards & Sons, Inc., as the representatives
              of the several underwriters named in Schedule I thereto.

     23.1     Consent of PricewaterhouseCoopers LLP

     23.2     Consent of Independent Petroleum Engineers and Geologists

     23.3     Consent of Cravath, Swaine & Moore

     23.4     Consent of Bennett Jones

     99       Prospectus Supplement dated November 10, 1999, relating to the
              sale by Chieftain International, Inc. (the "Company") of an
              aggregate of 2,500,000 common shares, no par value, of the Company
              (exclusive of underwriters' over-allotment option), and
              accompanying Prospectus dated October 20, 1999, filed pursuant to
              Rule 424(b)(2) under the Securities Act of 1933.


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                                   SIGNATURES

         Pursuant to the requirements of the Securities Exchange Act of 1934,
the registrant has duly caused this report to be signed on its behalf by the
undersigned hereunto duly authorized.


                              CHIEFTAIN INTERNATIONAL, INC.
                              (Registrant)

Date:  November 16, 1999      By:  /s/ Edward L. Hahn
                                   ---------------------------------------------
                                   Edward L. Hahn
                                   Senior Vice President, Finance and Treasurer


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                                  EXHIBIT INDEX


EXHIBIT NO.  DESCRIPTION OF EXHIBIT

1            Underwriting Agreement, dated November 10, 1999, among the
             Chieftain International, Inc. and CIBC World Markets Corp.,
             Dain Rauscher Incorporated and A.G. Edwards & Sons, Inc., as
             the representatives of the several underwriters named in
             Schedule I thereto.

23.1         Consent of PricewaterhouseCoopers LLP

23.2         Consent of Independent Petroleum Engineers and Geologists

23.3         Consent of Cravath, Swaine & Moore

23.4         Consent of Bennett Jones

99           Prospectus Supplement dated November 10, 1999, relating to the
             sale by Chieftain International, Inc. (the "Company") of an
             aggregate of 2,500,000 common shares, no par value, of the
             Company (exclusive of underwriters' over-allotment option),
             and accompanying Prospectus dated October 20, 1999, filed
             pursuant to Rule 424(b)(2) under the Securities Act of 1933.


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                                                                    EXHIBIT 1

                                2,500,000 SHARES

                          CHIEFTAIN INTERNATIONAL, INC.

                                  COMMON SHARES

                             UNDERWRITING AGREEMENT



                                                            November 10, 1999



CIBC WORLD MARKETS CORP.
DAIN RAUSCHER INCORPORATED
A.G. EDWARDS & SONS, INC.
c/o CIBC World Markets Corp.
One World Financial Center
New York, New York  10281

On behalf of the Several
Underwriters named on
Schedule I attached hereto.

Ladies and Gentlemen:

          Chieftain International, Inc., a corporation organized under the laws
of the Province of Alberta, Canada (the "Company"), proposes, subject to the
terms and conditions contained herein, to sell to you and the other underwriters
named on Schedule I to this Agreement (the "Underwriters"), for whom you are
acting as Representatives (the "Representatives"), an aggregate of 2,500,000
common shares (the "Firm Shares"), no par value (the "Common Shares"), of the
Company. All of the Firm Shares are to be issued and sold by the Company. The
respective amounts of the Firm Shares to be purchased by each of the several
Underwriters are set forth opposite their names on Schedule I hereto. In
addition, the Company proposes to grant to the Underwriters an option to
purchase up to an additional 375,000 Common Shares (the "Option Shares") from it
solely for the purpose of covering over-allotments in connection with the sale
of the Firm Shares. The Firm Shares and the Option Shares are together called
the "Shares."

          1. SALE AND PURCHASE OF THE SHARES.

          On the basis of the representations, warranties and agreements
contained in, and subject to the terms and conditions of, this Agreement:

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          (a) The Company agrees to sell to each Underwriter, and each
     Underwriter agrees, severally and not jointly, to purchase from the
     Company, at a price of $17.50 per share (the "Initial Price"), the number
     of Firm Shares set forth opposite the name of such Underwriter under the
     column "Number of Firm Shares to be Purchased" on Schedule I to this
     Agreement, subject to adjustment in accordance with Section 10 hereof.

          (b) The Company grants to the several Underwriters an option to
     purchase, severally and not jointly, all or any part of the Option Shares
     at the Initial Price. The number of Option Shares to be purchased by each
     Underwriter shall be the same percentage (adjusted by the Representatives
     to eliminate fractions) of the total number of Option Shares to be
     purchased by the Underwriters as such Underwriter is purchasing of the Firm
     Shares. Such option may be exercised only to cover over-allotments in the
     sales of the Firm Shares by the Underwriters and may be exercised in whole
     or in part at any time on or before 12:00 noon, New York City time, on the
     business day before the Firm Shares Closing Date (as defined below), and
     from time to time thereafter within 30 days after the date of this
     Agreement, in each case upon written, facsimile or telegraphic notice, or
     verbal or telephonic notice confirmed by written, facsimile or telegraphic
     notice, by the Representatives to the Company no later than 12:00 noon, New
     York City time, on the business day before the Firm Shares Closing Date or
     at least two business days before the Option Shares Closing Date (as
     defined below), as the case may be, setting forth the number of Option
     Shares to be purchased and the time and date (if other than the Firm Shares
     Closing Date) of such purchase.

          (c) In consideration of the services to be rendered by the
     Underwriters in connection with the distribution of the Shares, the Company
     agrees to pay to the Underwriters a fee equal to $0.96 per Share (the
     "Underwriting Commission") on the Firm Shares Closing Date (as defined in
     Section 2) with respect to each Firm Share and on any Option Shares Closing
     Date (as defined in Section 2) with respect to each Option Share.

          2. DELIVERY AND PAYMENT. The Shares to be purchased by the
Underwriters pursuant to the terms of this Agreement will be represented by
one or more share certificates. Delivery by the Company of the Firm Shares to
the Representatives for the respective accounts of the Underwriters, and
payment of the purchase price therefor in United States dollars by wire
transfer of Federal Funds or similar same day funds to an account designated
in writing by the Company to CIBC World Markets Corp. at least one business
day prior to the Firm Shares Closing Date (as defined below) and payment of
the related Underwriting Commission in United States dollars by wire transfer
of Federal Funds or similar same day funds to an account designated in
writing by CIBC World Markets Corp. at least one business day prior to the
Firm Shares Closing Date to the Company, shall take place at the offices of
Cravath, Swaine & Moore, Worldwide Plaza, 825 Eighth Avenue, New York, New
York 10019, at 10:00 a.m., New York City time, on the third (fourth, if
pricing is after 4:30 p.m. Eastern time) trading day following the date of
this Agreement, or at such time on such other date, not later than 10
business days after the date of this Agreement, as shall be

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agreed upon by the Company and the Representatives (such time and date of
delivery and payment is called the "Firm Shares Closing Date").

          In the event the option with respect to the Option Shares is exercised
in whole or in part on one or more occasions, delivery by the Company of the
Option Shares to the Representatives for the respective accounts of the
Underwriters and payment of the purchase price therefor in United States dollars
by wire transfer of Federal Funds or similar same day funds to an account
designated in writing by the Company to CIBC World Markets Corp. at least one
business day prior to the Option Shares Closing Date (as defined below) and
payment of the related Underwriting Commission in United States dollars by wire
transfer of Federal Funds or similar same day funds to an account designated in
writing by CIBC World Markets Corp. to the Company at least one business day
prior to the Option Shares Closing Date shall take place at the offices of
Cravath, Swaine & Moore specified above at the time and on the date (which may
be the same date as, but in no event shall be earlier than, the Firm Shares
Closing Date) specified in the notice referred to in Section 1(b) (each such
time and date of delivery and payment is called an "Option Shares Closing
Date"). The Firm Shares Closing Date and any Option Shares Closing Date are
called, individually, a "Closing Date" and, together, the "Closing Dates."

          The certificates evidencing the Shares shall be registered in such
names and shall be in such denominations as the Representatives shall request at
least two full business days before the Firm Shares Closing Date or the Option
Shares Closing Date, as applicable, and shall be made available to the
Representatives for checking and packaging, at such place as is designated by
the Representatives, on the full business day before the Firm Shares Closing
Date (or the Option Shares Closing Date in the case of the Option Shares).

          3. REGISTRATION STATEMENT AND PROSPECTUS; PUBLIC OFFERING IN THE
UNITED STATES. The Company has prepared and filed in conformity with the
requirements of the Securities Act of 1933, as amended (the "Securities
Act"), and the published rules and regulations thereunder (the "Rules")
adopted by the Securities and Exchange Commission (the "Commission") a
Registration Statement (as hereinafter defined) on Form S-3 (No. 333-88661)
and pre-effective Amendment No. 1 thereto for the registration of certain of
the Company's securities including the Shares, and the offering thereof from
time to time in accordance with Rule 415 of the Rules, and the Company has
filed such post-effective amendments thereto as may be required to the date
of this Agreement in order to effect the registration and the offering of the
Shares. Such Registration Statement has been declared effective by the
Commission. Copies of such Registration Statement (including all amendments
thereof) have heretofore been delivered by the Company to you. Promptly after
execution and delivery of this Agreement, the Company will prepare and file a
prospectus supplement in accordance with paragraph (b) of Rule 424 ("Rule
424(b)") of the Rules. The information included in a prospectus supplement
filed in respect of such registration statement pursuant to Rule 424(b) is
referred to as "Rule 424(b) Information." The term "Preliminary Prospectus"
means any prospectus or prospectus supplement that omitted the Rule 424(b)
Information that was used after the Registration Statement became effective
and prior to the date of this Agreement. The term "Registration Statement" as
used in this Agreement means the registration

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statement (including all exhibits, financial schedules, information and
documents deemed to be a part of the Registration Statement through
incorporation by reference) as amended at the time and on the date it became
effective (the "Effective Date") including the Rule 424(b) Information. The
term "Prospectus" as used in this Agreement means the final prospectus and
the final prospectus supplement relating to the Shares (including the
information and documents deemed to be a part of the prospectus by
incorporation by reference or otherwise) in the form filed with the
Commission pursuant to Rule 424(b) of the Rules. For purposes of this
Agreement, all references to the Registration Statement, any Preliminary
Prospectus, the Prospectus or any amendment or supplement to any of the
foregoing shall be deemed to include the copy filed with the Commission
pursuant to its Electronic Data Gathering, Analysis and Retrieval system
("EDGAR").

          All references in this Agreement to financial statements and schedules
and other information that is "contained," "included" or "stated" in the
Registration Statement, any Preliminary Prospectus or the Prospectus or other
references of like import, shall be deemed to mean and include all such
financial statements, schedules and other information that is incorporated by
reference in the Registration Statement, any Preliminary Prospectus or the
Prospectus, as the case may be; and all references in this Agreement to
amendments or supplements to the Registration Statement, any Preliminary
Prospectus or the Prospectus shall be deemed to mean and include the filing of
any document under the Securities Exchange Act of 1934, as amended (the
"Exchange Act") that is incorporated by reference in the Registration Statement,
such Preliminary Prospectus or the Prospectus, as the case may be.

          The Company understands that the Underwriters propose to make a public
offering of the Shares in the United States, as set forth in and pursuant to the
Prospectus, as soon after the date of this Agreement as the Representatives deem
advisable. The Company hereby confirms that the Underwriters and dealers have
been authorized to distribute or cause to be distributed each Preliminary
Prospectus and are authorized to distribute the Prospectus (as from time to time
amended or supplemented if the Company furnishes amendments or supplements
thereto to the Underwriters).

          4. REPRESENTATIONS AND WARRANTIES.

          A. The Company hereby represents and warrants to each Underwriter as
follows:

          (a) The Company meets the requirements for use of Form S-3 under the
     Securities Act. The Registration Statement has become effective under the
     Securities Act and no stop order suspending the effectiveness of the
     Registration Statement has been issued under the Securities Act and no
     proceedings for that purpose have been instituted or are pending or, to the
     knowledge of the Company, are threatened by the Commission, and any request
     on the part of the Commission for additional information has been complied
     with. Each Preliminary Prospectus and Prospectus filed as part of the
     Registration Statement as originally filed or as part of any amendment
     thereto, or filed pursuant to Rule 424(b) of the Rules, complied or will
     comply when so filed in all material


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     respects with the Rules and each Preliminary Prospectus and the Prospectus
     delivered to the Underwriters for use in connection with the offering of
     the Shares will, at the time of such delivery, be identical to the
     electronically transmitted copies thereof filed with the Commission
     pursuant to EDGAR, except to the extent permitted by Regulation S-T of the
     Rules.

          (b) As of the Effective Date, as of the date of the Prospectus and as
     of each Closing Date, the Registration Statement complied or will comply in
     all material respects with the applicable provisions of the Securities Act
     and the Rules and did not and will not contain any untrue statement of a
     material fact or omit to state any material fact required to be stated
     therein or necessary in order to make the statements therein not
     misleading; and as of the date of the Prospectus and as of each Closing
     Date neither the Prospectus, nor any amendment thereof or supplement
     thereto, contained or will contain any untrue statement of a material fact
     or omitted or will omit to state any material fact necessary in order to
     make the statements therein, in light of the circumstances under which they
     were made, not misleading. When any related Preliminary Prospectus was
     first filed with the Commission and when any amendment thereof or
     supplement thereto was first filed with the Commission, such Preliminary
     Prospectus as amended or supplemented did not contain any untrue statement
     of a material fact or omit to state any material fact required to be stated
     therein or necessary in order to make the statements therein not
     misleading. Notwithstanding the foregoing, none of the representations and
     warranties in this paragraph 4A(b) shall apply to statements in, or
     omissions from, the Registration Statement, the Preliminary Prospectus or
     the Prospectus made in reliance upon, and in conformity with, information
     herein or otherwise furnished in writing by the Representatives on behalf
     of the several Underwriters for use in the Registration Statement, the
     Preliminary Prospectus or the Prospectus. With respect to the preceding
     sentence, the Company acknowledges that the only information furnished in
     writing by the Representatives on behalf of the several Underwriters for
     use in the Registration Statement, the Preliminary Prospectus and the
     Prospectus are (i) the paragraph regarding selling concessions and
     reallowances, except for the first sentence thereof, (ii) the information
     regarding stabilization, and (iii) the paragraph regarding transactions by
     the Company with affiliates of CIBC World Markets Corp., all of which are
     set forth in the sections captioned "Underwriting" that appear in each of
     the Registration Statement, the Preliminary Prospectus and the Prospectus.

          (c) The documents incorporated by reference in the Registration
     Statement and the Prospectus, at the time they became effective or were
     filed with the Commission, as the case may be, complied in all material
     respects with the requirements of the Securities Act or the Exchange Act,
     as applicable, and the rules and regulations thereunder, and when read
     together with the other information in the Registration Statement and the
     Prospectus, do not contain an untrue statement of a material fact or omit
     to state a material fact required to be stated therein or necessary in
     order to make the statements therein not misleading.


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          (d) The consolidated financial statements of the Company and its
     subsidiaries (including all notes and schedules thereto) included or
     incorporated by reference in the Registration Statement and Prospectus
     present fairly the financial position, the results of operations, the
     statements of cash flows and the statements of shareholders' equity and the
     other information purported to be shown therein of the Company and its
     subsidiaries at the respective dates and for the respective periods to
     which they apply; and, except as may otherwise be disclosed therein or in
     the Prospectus, such financial statements have been prepared in conformity
     with Canadian generally accepted accounting principles, consistently
     applied throughout the periods involved, and, with respect to the unaudited
     financial statements, all adjustments necessary for a fair presentation of
     the results for such periods have been made. The summary and selected
     financial data included in the Prospectus present fairly the information
     shown therein as at the respective dates and for the respective periods
     specified and the summary and selected financial data have been presented
     on a basis consistent with the consolidated financial statements so set
     forth in the Prospectus and other financial information. The
     reconciliations to United States generally accepted accounting principles
     contained in the notes to the financial statements of the Company included
     or incorporated by reference in the Registration Statement and Prospectus
     comply with the requirements of Item 18 of Form 20-F promulgated by the
     Commission.

          (e) PricewaterhouseCoopers LLP, whose reports are filed with the
     Commission as a part of the Registration Statement, are and, during the
     periods covered by their reports, were independent public accountants as
     required by the Securities Act and the Rules.

          (f) The Company is a corporation duly organized, validly subsisting
     and qualified to do business under the laws of the Province of Alberta,
     Canada. Each of the Subsidiaries (as hereinafter defined) is a corporation
     duly organized, validly existing and in good standing under the laws of its
     jurisdiction of incorporation. The Company and each subsidiary or other
     entity controlled directly or indirectly by the Company (collectively,
     "Subsidiaries") is duly qualified to do business and is in good standing as
     a foreign corporation in each jurisdiction in which the nature of the
     business conducted by it or location of the assets or properties owned,
     leased or licensed by it requires such qualification, except for such
     jurisdictions where the failure to so qualify would not have a material
     adverse effect on the assets or properties, business, prospects, results of
     operations or financial condition of the Company and the Subsidiaries taken
     as whole (a "Material Adverse Effect"). Each of the Company and its
     Subsidiaries has all requisite corporate power and capacity, and all
     necessary authorizations, approvals, consents, orders, licenses,
     certificates and permits of and from all governmental or regulatory bodies
     or any other person or entity (collectively, the "Permits"), to own, lease
     and license its assets and properties and conduct its business, all of
     which are valid and in full force and effect, as described in the
     Registration Statement and the Prospectus, except where the lack of such
     Permits, individually or in the aggregate, would not have a Material
     Adverse Effect. Each of the Company and its Subsidiaries has fulfilled and
     performed in all material respects all


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     of its material obligations with respect to such Permits and no event has
     occurred that allows, or after notice or lapse of time would allow,
     revocation or termination thereof or would result in any other material
     impairment of the rights of the Company thereunder. Except as may be
     required under the Securities Act and state and foreign securities laws
     (including Canadian provincial securities laws), no other Permits are
     required to enter into, deliver and perform this Agreement and to issue and
     sell the Shares.

          (g) Each of the Company and its Subsidiaries owns or possesses
     adequate and enforceable rights to use all trademarks, trademark
     applications, trade names, service marks, copyrights, copyright
     applications, licenses, know-how and other similar rights and proprietary
     knowledge (collectively, "Intangibles") described in the Prospectus as
     being owned by it necessary for the conduct of its business, except for
     those Intangibles which, if not so owned or possessed, would not have a
     Material Adverse Effect. Neither the Company nor any of the Subsidiaries
     has received any notice of, or is aware of, any infringement of or conflict
     with asserted rights of others with respect to any Intangibles, except for
     those infringements or conflicts that would not have a Material Adverse
     Effect.

          (h) Neither the Company nor any of its Subsidiaries owns any real
     property (other than oil and gas properties). Each of the Company and its
     Subsidiaries has good and marketable title to all personal property
     described in the Prospectus as being owned by it. Any real property and
     buildings described in the Prospectus as being held under lease by the
     Company or any Subsidiary are held by it or such Subsidiary under valid,
     existing and enforceable leases, free and clear of all liens, encumbrances,
     claims, security interests and defects, except such as are described in the
     Registration Statement and the Prospectus or would not have a Material
     Adverse Effect. Each of the Company and its Subsidiaries has good and
     defensible title to their oil and gas properties free and clear of all
     liens, encumbrances and defects, except (a) those described in the
     Registration Statement and the Prospectus, (b) liens securing taxes and
     other governmental charges, or claims of materialmen, mechanics and similar
     persons, not yet due and payable, (c) liens and encumbrances under
     operating agreements, unitization and pooling agreements, and gas sales
     contracts, securing payment of amounts not yet due and payable and of a
     scope and nature customary in the oil and gas industry and (d) liens,
     encumbrances and defects that do not in the aggregate materially affect the
     value of such oil and gas properties or materially interfere with the use
     made or proposed to be made of such properties by the Company and the
     Subsidiaries. The oil, gas and mineral leases, options to lease, drilling
     concessions or other property interests therein held by the Company and
     Subsidiaries are valid, subsisting and enforceable and reflect in all
     material respects the right of the Company and the Subsidiaries, as the
     case may be, to explore or receive production from the undeveloped
     properties described in the Registration Statement and the Prospectus,
     and the care taken by the Company and the Subsidiaries with respect to
     acquiring or otherwise procuring such leases, options to lease, drilling
     concessions and other property interests was generally consistent with
     standard industry practices for acquiring or procuring leases and interests
     therein to explore such for hydrocarbons. All other leases and subleases of
     the

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     Company and the Subsidiaries and under which the Company or any of the
     Subsidiaries holds properties described in the Registration Statement and
     the Prospectus are in full force and effect, except for such leases and
     subleases that, if not in full force and effect, would not have a Material
     Adverse Effect. Neither the Company nor any of the Subsidiaries has actual
     notice of any claim of any sort that has been asserted by anyone adverse to
     the rights of the Company or any Subsidiary under any of such leases or
     subleases, or affecting or questioning the rights of the Company or any
     such Subsidiary to the continued possession of the leased or subleased
     premises under any such lease or sublease, except for such claims that
     would not have a Material Adverse Effect.

          (i) There is no litigation or governmental proceeding to which the
     Company or the Subsidiaries is subject or which is pending or, to the
     knowledge of the Company, threatened, against the Company or any of the
     Subsidiaries, which, individually or in the aggregate, might have a
     Material Adverse Effect, affect the consummation of this Agreement or which
     is required to be disclosed in the Registration Statement and the
     Prospectus that is not so disclosed.

          (j) Subsequent to the respective dates as of which information is
     given in the Registration Statement and the Prospectus, except as described
     therein, (a) there has not been any material adverse change with regard to
     the assets or properties, business, results of operations or financial
     condition of the Company or the Subsidiaries; (b) neither the Company nor
     the Subsidiaries has sustained any loss or interference with its assets,
     businesses or properties (whether owned or leased) from fire, explosion,
     earthquake, flood or other calamity, whether or not covered by insurance,
     or from any labor dispute or any court or legislative or other governmental
     action, order or decree which would have a Material Adverse Effect; (c)
     since the date of the latest balance sheet included in the Registration
     Statement and the Prospectus, except as reflected therein, neither the
     Company nor any of the Subsidiaries has (i) issued any securities or
     incurred any liability or obligation, direct or contingent, for borrowed
     money, except such liabilities or obligations incurred in the ordinary
     course of business, or (ii) entered into any transaction not in the
     ordinary course of business; and (d) the Company has not declared or paid
     any dividend or made any distribution on any of its shares or redeemed,
     purchased or otherwise acquired or agreed to redeem, purchase or otherwise
     acquire any of its shares except pursuant to its share repurchase plan
     which expired on November 1, 1999.

          (k) There is no document, contract or other agreement of a character
     required to be described in the Registration Statement or Prospectus or to
     be filed as an exhibit to the Registration Statement which is not described
     or filed as required by the Securities Act or Rules. Each description of a
     contract, document or other agreement in the Registration Statement and the
     Prospectus accurately reflects in all material respects the terms of the
     underlying document, contract or agreement. Neither the Company nor any
     Subsidiary, if a Subsidiary is a party, nor, to the knowledge of the
     Company, any other party is in default in the observance or performance of
     any term or obligation to be performed by it under any


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     such agreement, and no event has occurred which with notice or lapse of
     time or both would constitute such a default, in any such case which
     default or event, individually or in the aggregate, would have a Material
     Adverse Effect. No default exists, and no event has occurred which with
     notice or lapse of time or both would constitute a default, in the due
     performance and observance of any term, covenant or condition, by the
     Company or any Subsidiary, if a Subsidiary is a party thereto, of any other
     agreement or instrument to which the Company or any Subsidiary is a party
     or by which it or any Subsidiary or their properties or business may be
     bound or affected which default or event, individually or in the aggregate,
     would have a Material Adverse Effect.

          (l) Neither the Company nor any of the Subsidiaries is in violation of
     any term or provision of its articles or by-laws or of any franchise,
     license, permit, judgment, decree, order, statute, rule or regulation,
     where the consequences of such violation, individually or in the aggregate,
     would have a Material Adverse Effect.

          (m) Neither the execution, delivery and performance of this Agreement
     by the Company nor the consummation of any of the transactions contemplated
     hereby (including, without limitation, the issuance and sale by the Company
     of the Shares) will give rise to a right to terminate or accelerate the due
     date of any payment due under, or conflict with or result in the breach of
     any term or provision of, or constitute a default (or an event which with
     notice or lapse of time or both would constitute a default) under, or
     require any consent or waiver under, or result in the execution or
     imposition of any lien, charge or encumbrance upon any properties or assets
     of the Company or the Subsidiaries pursuant to the terms of, any indenture,
     mortgage, deed of trust or other agreement or instrument to which the
     Company or any of the Subsidiaries is a party or by which the Company or
     any of the Subsidiaries or any of their properties or businesses is bound,
     or any franchise, license, permit, judgment, decree, order, statute, rule
     or regulation applicable to the Company or any of the Subsidiaries or
     violate any provision of the articles or by-laws of the Company or any of
     the Subsidiaries, except for such consents or waivers which have already
     been obtained and are in full force and effect.

          (n) The Company has authorized and outstanding share capital as set
     forth under the caption "Capitalization" in the Prospectus. The
     certificates evidencing the Shares are in proper legal form and have been
     duly authorized for issuance by the Company. All of the issued and
     outstanding Common Shares have been duly and validly issued and are fully
     paid and nonassessable. Except as disclosed in the Prospectus, there are no
     statutory preemptive or other similar rights to subscribe for or to
     purchase or acquire any Common Shares of the Company or the Subsidiaries or
     any such rights pursuant to its articles or by-laws or any agreement or
     instrument to or by which the Company or any of the Subsidiaries is a party
     or bound. The Shares, when issued and sold pursuant to this Agreement, (i)
     will be duly and validly issued, fully paid and nonassessable and none of
     them will be issued in violation of any preemptive or other similar right
     and (ii) will be issued with an associated common share purchase right
     under the Company's Shareholder Rights Plan


                                        9

<PAGE>


     described in the Prospectus. Except (1) as disclosed in the Registration
     Statement and the Prospectus and (2) for employee share options
     issued after September 30, 1999 pursuant to the share option plans
     of the Company described in the Registration Statement and the Prospectus,
     there is no outstanding option, warrant or other right calling for the
     issuance of, and there is no commitment, plan or arrangement to issue, any
     shares of the Company or the Subsidiaries or any security convertible into,
     or exercisable or exchangeable for, such shares. The Common Shares and the
     Shares conform in all material respects to the descriptions thereof
     contained in the Registration Statement and the Prospectus. All outstanding
     shares of each Subsidiary have been duly authorized and validly issued, and
     are fully paid and nonassessable and all common shares of each Subsidiary
     are owned directly by the Company or by another wholly-owned subsidiary of
     the Company free and clear of any security interests, liens, encumbrances,
     equities or claims, other than those described in the Prospectus.

          (o) No holder of any security of the Company has the right to have any
     security owned by such holder included in the Registration Statement or to
     demand registration of any security owned by such holder.

          (p) All necessary corporate action has been duly and validly taken by
     the Company to authorize the execution, delivery and performance of this
     Agreement and the issuance and sale of the Shares by the Company. This
     Agreement has been duly and validly authorized, executed and delivered by
     the Company.

          (q) Neither the Company nor any of the Subsidiaries is involved in any
     labor dispute nor, to the knowledge of the Company, is any such dispute
     threatened, which dispute would have a Material Adverse Effect. The Company
     is not aware of any existing or imminent labor disturbance by the employees
     of any of the principal suppliers or contractors of the Company or the
     Subsidiaries that would have a Material Adverse Effect.

          (r) No transaction has occurred between or among the Company and any
     of its officers or directors or five percent shareholders or any affiliate
     or affiliates of any such officer or director or five percent shareholders
     that is required to be described in and is not described in the
     Registration Statement and the Prospectus.

          (s) The Company has not taken, nor will it take, directly or
     indirectly, any action designed to or which might reasonably be expected to
     cause or result in, or which has constituted or which might reasonably be
     expected to constitute, the stabilization or manipulation of the price of
     the Common Shares to facilitate the sale or resale of any of the Shares.

          (t) The Company and the Subsidiaries have filed all federal, state,
     local and foreign tax returns which are required to be filed through the
     date hereof, or have received extensions thereof, and have paid all taxes
     shown on such returns and all assessments


                                       10

<PAGE>


     received by them to the extent that the same are material and have become
     due. There are no tax audits pending or, to the knowledge of the Company,
     any investigations pending, which if adversely determined would have a
     Material Adverse Effect. To the knowledge of the Company, there are no
     material proposed additional tax assessments against the Company or any of
     the Subsidiaries.

          (u) The Shares have been duly authorized for quotation on the American
     Stock Exchange, subject to official notice of issuance, and the Shares have
     been conditionally approved for listing on The Toronto Stock Exchange,
     subject to customary requirements. Registration statements have been filed
     with respect to the Common Shares and the associated common share purchase
     rights issued pursuant to the Company's Shareholder Rights Plan on Form 8-A
     pursuant to Section 12 of the Exchange Act, which registration statements
     comply in all material respects with the Exchange Act.

          (v) The books, records and accounts of the Company and the
     Subsidiaries accurately and fairly reflect, in reasonable detail, the
     transactions in, and dispositions of, the assets of, and the results of
     operations of, the Company and the Subsidiaries. The Company and each of
     the Subsidiaries maintain a system of internal accounting controls
     sufficient to provide reasonable assurances that (i) transactions are
     executed in accordance with management's general or specific
     authorizations, (ii) transactions are recorded as necessary to permit
     preparation of financial statements in accordance with generally accepted
     accounting principles and to maintain asset accountability, (iii) access to
     assets is permitted only in accordance with management's general or
     specific authorization and (iv) the recorded accountability for assets is
     compared with the existing assets at reasonable intervals and appropriate
     action is taken with respect to any differences.

          (w) The Company and the Subsidiaries are insured in accordance with
     industry standards against such losses and risks and in such amounts as are
     customary in the businesses in which they are engaged; all policies of
     insurance and fidelity or surety bonds insuring the Company or any of the
     Subsidiaries or the Company's or the Subsidiaries' respective businesses,
     assets, employees, officers and directors are in full force and effect; the
     Company and each of the Subsidiaries are in compliance with the terms of
     such policies and instruments in all material respects; and neither the
     Company nor any Subsidiary has reason to believe that it will not be able
     to renew its existing insurance coverage as and when such coverage expires
     or to obtain similar coverage from similar insurers as may be necessary to
     continue its business at a cost that would not have a Material Adverse
     Effect.

          (x) Each approval, consent, order, authorization, designation,
     declaration or filing of, by or with any regulatory, administrative or
     other governmental body necessary in connection with the execution and
     delivery by the Company of this Agreement and the consummation of the
     transactions herein contemplated required to be obtained or performed by
     the Company (except such additional steps as may be required by the
     National Association of Securities Dealers, Inc. (the "NASD") or may be
     necessary to


                                       11

<PAGE>


     qualify the Shares for public offering in the United States by the
     Underwriters under state or foreign securities laws, including Canadian
     provincial securities laws) has been obtained or made and is in full force
     and effect.

          (z) In the ordinary course of its business, the Company periodically
     reviews the effect of Environmental Laws (as hereinafter defined) on the
     business, operations and properties of the Company and its subsidiaries. In
     the course of this review, the Company identifies and evaluates associated
     costs and liabilities, including, without limitation, any capital or
     operating expenditures required for clean-up, closure of properties or
     compliance with Environmental Laws, or any permit, license or approval, any
     related constraints on operating activities and any potential liabilities
     to third parties). On the basis of such review, and except as described in
     the Registration Statement and Prospectus and except to the extent that
     would not have a Material Adverse Effect (i) each of the Company and its
     Subsidiaries is in compliance in all material respects with all rules, laws
     and regulation relating to the use, treatment, storage and disposal of
     toxic substances and protection of health or the environment
     ("Environmental Laws") that are applicable to its business; (ii) neither
     the Company nor any of the Subsidiaries has received any notice from any
     governmental authority or third party of an asserted claim under
     Environmental Laws; (iii) each of the Company and the Subsidiaries has
     received all permits, licenses or other approvals required of it under
     applicable Environmental Laws to conduct its business and is in compliance
     with all terms and conditions of any such permit, license or approval; (iv)
     to the knowledge of the Company, no facts currently exist that will require
     the Company or the Subsidiaries to make future material capital
     expenditures to comply with Environmental Laws; (v) no property that is or
     has been owned, leased or occupied by the Company or any of the
     Subsidiaries has been designated as a Superfund site pursuant to the
     Comprehensive Environmental Response, Compensation and Liability Act of
     1980, as amended (42 U.S.C. Section 9601, et. seq.) ("CERCLA 1980") or
     otherwise designated as a contaminated site under applicable state or local
     law; and (vi) the Company has reasonably concluded that there are no
     unanticipated associated costs and liabilities which would, singly or in
     the aggregate, have a Material Adverse Effect.. To the knowledge of the
     Company, neither the Company nor any of the Subsidiaries has been named as
     a "potentially responsible party" under CERCLA 1980.

          (aa) The Company is not and, after giving effect to the offering and
     sale of the Shares and the application of proceeds thereof as described in
     the Prospectus, will not be an "investment company" within the meaning of
     the Investment Company Act of 1940, as amended (the "Investment Company
     Act").

          (bb) Except to the extent that would not have a Material Adverse
     Effect, none of the Company, the Subsidiaries or any other person
     associated with or acting on behalf of the Company or the Subsidiaries
     including, without limitation, any director, officer, agent or employee of
     the Company or the Subsidiaries has, directly or indirectly, while acting
     on behalf of the Company or any of the Subsidiaries (i) used any corporate
     funds for unlawful


                                       12

<PAGE>


     contributions, gifts, entertainment or other unlawful expenses
     relating to political activity; (ii) made any unlawful payment to foreign
     or domestic government officials or employees or to foreign or domestic
     political parties or campaigns from corporate funds; (iii) violated any
     provision of the Foreign Corrupt Practices Act of 1977, as amended, to the
     extent such statute is applicable to the Company or any of its
     Subsidiaries; or (iv) made any other unlawful payment.

          (cc) The Company has reviewed its operations and those of the
     Subsidiaries to evaluate the extent to which the business or operations of
     the Company or any of its Subsidiaries will be affected by any significant
     risk that computer hardware or software applications used by the Company
     and its Subsidiaries will not, in the case of dates or time periods
     occurring after December 31, 1999, function at least as effectively as in
     the case of dates or time periods occurring prior to January 1, 2000 (the
     "Year 2000 Problem"); as a result of such review, the Company has no reason
     to believe, and does not believe, that (A) there are any issues related to
     the Company's preparedness to address the Year 2000 Problem that are of a
     character required to be described or referred to in the Registration
     Statement or Prospectus that have not been accurately described in the
     Registration Statement or Prospectus and (B) the Year 2000 Problem will
     have a Material Adverse Effect, or result in any material loss or
     interference with the business or operations of the Company and its
     subsidiaries, taken as a whole.

          (dd) Netherland, Sewell & Associates, Inc., who prepared estimates of
     the extent and value of the U.S. proved oil and natural gas reserves of the
     Company and the Subsidiaries, are independent with respect to the Company
     and the Subsidiaries. The information supplied by the Company to
     Netherland, Sewell & Associates, Inc. for purposes of preparing the reserve
     reports and estimates of such engineers included in the Registration
     Statement and the Prospectus, including, without limitation, production,
     costs of operation and development, current prices for production,
     agreements relating to current and future operations and sales of
     production, was true and correct in all material respects on the date
     supplied and was prepared by the Company in accordance with customary
     industry practices.

          B. Each of the Underwriters, severally and not jointly, hereby
     represents and warrants to the Company that such Underwriter understands
     and acknowledges that the Shares have not been and will not be qualified
     for public distribution under the securities laws of Canada or any province
     or territory of Canada and that the Shares may not be offered or sold,
     directly or indirectly, in Canada in violation of the securities laws of
     Canada or any province or territory of Canada.

          5. CONDITIONS OF THE UNDERWRITERS' OBLIGATIONS. The obligations of the
     Underwriters under this Agreement are several and not joint. The respective
     obligations of the Underwriters to purchase the Shares are subject to each
     of the following terms and conditions:


                                       13

<PAGE>


          (a) The Prospectus shall have been timely filed with the Commission in
     accordance with Section 6(a)(i) of this Agreement.

          (b) No order preventing or suspending the use of any Preliminary
     Prospectus or the Prospectus shall have been or shall be in effect and no
     order suspending the effectiveness of the Registration Statement shall be
     in effect and no proceedings for such purpose shall be pending before or
     threatened by the Commission; no order having the effect of ceasing or
     suspending the distribution of the Shares shall have been issued and no
     proceedings for such purpose shall have been initiated or threatened by the
     Commission or any securities regulatory authority in Canada; and any
     requests for additional information on the part of the Commission (to be
     included in the Registration Statement or the Prospectus or otherwise)
     shall have been complied with.

          (c) The representations and warranties of the Company contained in
     this Agreement and in the certificates delivered pursuant to Section 5(d)
     shall be true and correct when made and on and as of each Closing Date as
     if made on such date. The Company shall have performed all covenants and
     agreements and satisfied all the conditions contained in this Agreement
     required to be performed or satisfied by it on or before such Closing Date.

          (d) The Representatives shall have received on each Closing Date a
     certificate, addressed to the Representatives and dated such Closing Date,
     of the chief executive or chief operating officer and the chief financial
     officer or chief accounting officer of the Company to the effect that (i)
     the signers of such certificate have carefully examined the Registration
     Statement, the Prospectus and this Agreement, (ii) the representations and
     warranties of the Company in this Agreement are true and correct on and as
     of such Closing Date with the same effect as if made on such Closing Date
     and the Company has performed all covenants and agreements and satisfied
     all conditions contained in this Agreement required to be performed or
     satisfied by it at or prior to such Closing Date, (iii) no stop order
     suspending the effectiveness of the Registration Statement has been issued
     and to the best of their knowledge, no proceedings for that purpose have
     been instituted or are pending under the Securities Act, and (iv) no order
     having the effect of ceasing or suspending the distribution of the Shares
     has been issued by any securities regulatory authority in Canada and to the
     best of its knowledge, no proceedings for that purpose have been instituted
     or are pending.

          (e) The Representatives shall have received, at the time this
     Agreement is executed and on each Closing Date, a signed letter from
     PricewaterhouseCoopers LLP, addressed to the Representatives and dated,
     respectively, the date of this Agreement and each such Closing Date, in
     form and substance reasonably satisfactory to the Representatives.


                                       14

<PAGE>


          (f) The Representatives shall have received on each Closing Date from
     Cravath, Swaine & Moore, U.S. counsel for the Company, an opinion,
     addressed to the Representatives and dated such Closing Date, and stating
     in effect that:

               (i) No consent, approval, authorization or order of any court or
          governmental agency or regulatory body is required under United States
          federal or New York laws for the execution, delivery or performance of
          this Agreement by the Company or the consummation of the transactions
          contemplated hereby or thereby, except such as have been obtained
          under the Securities Act and such as may be required under state or
          foreign securities or Blue Sky laws in connection with the purchase
          and distribution of the Shares by the several Underwriters.

               (ii) Accurate copies of all contracts and other documents
          required to be filed as exhibits to, or described in, the Registration
          Statement have been so filed with the Commission or are fairly
          described in the Registration Statement, as the case may be.

               (iii) The Registration Statement is effective under the
          Securities Act, and no stop order suspending the effectiveness of the
          Registration Statement has been issued and no proceedings for that
          purpose have been instituted or, to the knowledge of such counsel, are
          threatened, pending or contemplated. Any required filing of the
          Prospectus and any supplement thereto pursuant to Rule 424(b) under
          the Securities Act has been made in the manner and within the time
          period required by such Rule 424(b).

               (iv) The Shares have been approved for listing on the American
          Stock Exchange.

               (v) The Company is not an "investment company" or an entity
          controlled by an "investment company" as such terms are defined in the
          Investment Company Act of 1940, as amended.

               (vi) The information set forth in the Prospectus under the
          caption "Certain Income Tax Considerations - United States Federal
          Income Tax Considerations" to the extent that it constitutes matters
          of law or legal conclusions has been reviewed by such counsel and is
          correct in all material respects and the opinion of such counsel set
          forth therein is confirmed.

          To the extent deemed advisable by such counsel, they may rely as to
matters of fact on certificates of responsible officers of the Company and
public officials.

          In addition, such counsel shall state that such counsel has
participated in conferences with certain officers of, and with the accountants
and Canadian counsel for,


                                       15

<PAGE>


the Company concerning the preparation of the Registration Statement and the
Prospectus and, although such counsel cannot and does not assume responsibility
for the accuracy or completeness of the statements made in the Registration
Statement and Prospectus, except insofar as such statements relate to such
counsel, on the basis of the foregoing, such counsel's work in connection with
the Registration Statement and the Prospectus did not disclose any information
that gave such counsel reason to believe that: (i) the Registration Statement,
at the time the Registration Statement became effective, or the Prospectus, as
of its issue date or as of the Closing Date (in each case except for the
financial statements and other information of an accounting or financial nature
included therein, or information relating to oil and gas reserves and future net
cash flows and other information derived therefrom, as to which such counsel
need not express any view), was not appropriately responsive in all material
respects to the requirements of the Securities Act and the Rules, (ii) the
documents incorporated by reference in the Registration Statement and the
Prospectus, as of the dates they became effective or were filed with the
Commission, as the case may be (in each case except for the financial statements
and other information of an accounting or financial nature included therein, or
information relating to oil and gas reserves and future net cash flows and other
information derived therefrom, as to which such counsel need not express any
view), were not appropriately responsive in all material respects to the
requirements of the Exchange Act and the rules promulgated thereunder, and (iii)
the Registration Statement, at the time the Registration Statement became
effective, contained an untrue statement of a material fact or omitted to state
a material fact required to be stated therein or necessary to make the
statements therein not misleading, or that the Prospectus, as of its issue date
and at the Closing Date, included or includes an untrue statement of a material
fact or omitted or omits to state a material fact necessary in order to make the
statements therein, in the light of the circumstances under which they were
made, not misleading (in each case except for the financial statements and other
information of an accounting or financial nature included therein, or
information relating to oil and gas reserves and future net cash flows and other
information derived therefrom, as to which such counsel need not express any
view).

          (g) The Representatives shall have received on each Closing Date from
Bennett Jones, Canadian counsel for the Company, an opinion, addressed to the
Representatives and dated such Closing Date, and stating in effect that:

               (i) The Company is a corporation duly organized, validly
          subsisting and qualified to do business under the laws of the Province
          of Alberta, Canada. Each of the Subsidiaries has been duly organized
          and is validly existing as a corporation in good standing under the
          laws of its jurisdiction of incorporation. The Company and each of the
          Subsidiaries is duly qualified and in good standing as a foreign
          corporation in each jurisdiction in which the character or location of
          its assets or properties (owned, leased or licensed) or the nature of
          its businesses makes such qualification necessary, except for such
          jurisdictions where the failure  to so qualify, individually or in
          the aggregate, would not have a Material Adverse Effect.



                                       16

<PAGE>


               (ii) Each of the Company and its Subsidiaries has all requisite
          corporate power and capacity to own, lease and license its assets and
          properties and conduct its business as now being conducted and as
          described in the Registration Statement and the Prospectus, and with
          respect to the Company, to enter into, deliver and perform this
          Agreement. The Company has all requisite corporate power and capacity
          to issue and sell the Shares.

               (iii) The Company has authorized and issued share capital as set
          forth in the Registration Statement and the Prospectus under the
          caption "Capitalization"; the certificates evidencing the Shares are
          in proper legal form and have been duly authorized for issuance by the
          Company; all of the outstanding Common Shares have been duly and
          validly authorized and issued and are fully paid and nonassessable and
          none of them was issued in violation of any preemptive or other
          similar right. The Shares when issued and sold pursuant to this
          Agreement will be duly and validly issued, outstanding, fully paid and
          nonassessable and none of them will have been issued in violation of
          any preemptive or other similar right. To the best of such counsel's
          knowledge, except as disclosed in the Registration Statement and the
          Prospectus, there are no preemptive or other rights to subscribe for
          or to purchase or any restriction upon the voting or transfer of any
          securities of the Company pursuant to the Company's Articles of
          Incorporation or by-laws or other governing documents or any
          agreements or other instruments to which the Company is a party or by
          which it is bound. To the best of such counsel's knowledge, except as
          disclosed in the Registration Statement and the Prospectus, there is
          no outstanding option, warrant or other right calling for the issuance
          of, and no commitment, plan or arrangement to issue, any shares of the
          Company or any security convertible into, exercisable for, or
          exchangeable for any Common Shares or preferred shares of the Company.
          The Common Shares and the Shares conform in all material respects to
          the descriptions thereof contained in the Registration Statement and
          the Prospectus. The issued and outstanding shares of capital stock of
          each of the Company's Subsidiaries have been duly authorized and
          validly issued, are fully paid and nonassessable and all common shares
          of each of the Subsidiaries are owned directly by the Company or by
          another wholly owned subsidiary of the Company, free and clear of any
          perfected security interest or, to the knowledge of such counsel, any
          other security interests, liens, encumbrances, equities or claims,
          other than those contained in the Registration Statement and the
          Prospectus.

               (iv) Each of the Lock-Up Agreements as set forth in Section 5(i)
          has been duly and validly executed by such persons and constitutes the
          legal, valid and binding obligation of each such person enforceable
          against each such person in accordance with its terms, except as the
          enforceability thereof may be limited by applicable bankruptcy,
          insolvency, reorganization, moratorium or other similar laws


                                       17

<PAGE>


         affecting the enforcement of creditors' rights generally and by
         general equitable principles.

               (v) All necessary corporate action has been duly and validly
          taken by the Company to authorize the execution, delivery and
          performance of this Agreement and the issuance and sale of the Shares.
          This Agreement has been duly and validly authorized, executed and
          delivered by the Company. This Agreement constitutes the legal, valid
          and binding obligation of the Company enforceable against the Company
          in accordance with its terms except as such enforceability may be
          limited by applicable bankruptcy, insolvency, fraudulent conveyance,
          reorganization, moratorium and other similar laws affecting the
          enforcement of creditors' rights generally and by general equitable
          principles and except to the extent that the rights to indemnity and
          contribution provided for in this Agreement may be limited by
          applicable law or the public policy underlying such law.

               (vi) Neither the execution, delivery or performance of this
          Agreement by the Company nor the consummation of any of the
          transactions contemplated hereby (including, without limitation, the
          issuance and sale by the Company of the Shares) will, to the best of
          such counsel's knowledge, give rise to a right to terminate or
          accelerate the due date of any payment due under, or conflict with or
          result in the breach of any term or provision of, or constitute a
          default (or any event which with notice or lapse of time, or both,
          would constitute a default) under, or require consent or waiver under,
          or result in the execution or imposition of any lien, charge, claim,
          security interest or encumbrance upon any properties or assets of the
          Company or any Subsidiary pursuant to the terms of any indenture,
          mortgage, deed trust, note or other agreement or instrument of which
          such counsel is aware and to which the Company or any Subsidiary is a
          party or by which either the Company or any Subsidiary or any of its
          properties or businesses is bound, or any franchise, license, permit,
          judgment, decree, order, statute, rule or regulation of which such
          counsel is aware or violate any provision of the articles or by-laws
          of the Company or any Subsidiary.

               (vii) To the best of such counsel's knowledge, no default exists,
          and no event has occurred which with notice or lapse of time, or both,
          would constitute a default, in the due performance and observance of
          any term, covenant or condition by the Company or any Subsidiary of
          any indenture, mortgage, deed of trust, note or any other agreement or
          instrument to which the Company or any Subsidiary is a party or by
          which it or any of its assets or properties or businesses may be bound
          or affected, where the consequences of such default, individually or
          in the aggregate, would have a Material Adverse Effect.

               (viii) To the best of such counsel's knowledge, neither the
          Company nor any of the Subsidiaries is in violation of any term or
          provision of its articles or
                                       18


<PAGE>


          by-laws or any franchise, license, permit, judgment, decree,
          order, statute, rule or regulation, where the consequences of such
          violation, individually or in the aggregate, would have a Material
          Adverse Effect.

               (ix) All necessary consents, approvals, authorizations and orders
          have been obtained under the securities laws of the Province of
          Alberta to permit the Shares to be issued, sold and delivered to the
          Underwriters and offered, sold and delivered by the Underwriters to
          purchasers in the United States pursuant to the Prospectus, and no
          other consent, approval, authorization, filing with or order of any
          Canadian federal or Province of Alberta court or governmental agency
          or body is required for the execution, delivery or performance of this
          Agreement by the Company or the issuance, sale or delivery of the
          Shares to the Underwriters or the offering, sale or delivery of the
          Shares by the Underwriters to purchasers in the United States pursuant
          to the Prospectus.

               (x) To the best of such counsel's knowledge, there is no
          litigation or governmental or other proceeding or investigation,
          before any court or before or by any public body or board pending or
          threatened against, or involving the assets, properties or businesses
          of, the Company or the Subsidiaries which would have a Material
          Adverse Effect.

               (xi) The statements in the Prospectus under the captions
          "Description of Share Capital," "Description of Debt Securities,"
          "Description of Warrants," "Enforcement of Civil Liabilities,"
          "Business and Properties - Litigation," "Risk Factors" and
          "Management's Discussion and Analysis of Financial Condition and
          Results of Operations," insofar as such statements constitute a
          summary of documents referred to therein or matters of law, are fair
          summaries in all material respects and accurately present the
          information called for with respect to such documents and matters.

               (xii) The common share purchase rights issuable under the
          Company's Shareholder Rights Plan to which holders of the Shares are
          entitled have been duly authorized and will be issued and attached to
          the Shares when such Shares are sold and issued in accordance with
          this Agreement without further action by the Company.

               (xiii) The Shares have been conditionally approved for listing on
          The Toronto Stock Exchange.

               (xiv) The share capital of the Company conforms in all material
          respects to the description thereof contained in the Prospectus under
          the caption "Description of Share Capital."

                                       19

<PAGE>



               (xv) The opinion of Bennett Jones set forth in the Prospectus
          under the caption "Certain Income Tax Considerations - Certain
          Canadian Federal Income Tax Considerations" has been reviewed by such
          counsel and is confirmed.

          The opinion of such counsel shall also contain such opinions relating
to conflicts of laws and enforceability of judgments in respect of the
Underwriting Agreement as the Representatives may reasonably request.

          To the extent deemed advisable by such counsel, they may rely as to
matters of fact on certificates of responsible officers of the Company and
public officials and on the opinions of other counsel satisfactory to the
Representatives as to matters which are governed by laws other than the laws of
Canada and the provinces of Alberta and Ontario; provided that such counsel
shall state that in their opinion the Underwriters and they are justified in
relying on such other opinions. Copies of such certificates and other opinions
shall be furnished to the Representatives and counsel for the Underwriters.

          In addition, such counsel shall state that such counsel has
participated in conferences with officers and other representatives of the
Company, U.S. counsel for the Company, representatives of the Representatives
and representatives of the independent public accountants of the Company, at
which conferences the contents of the Registration Statement and the Prospectus
and related matters were discussed and, although such counsel is not passing
upon and does not assume any responsibility for the accuracy, completeness or
fairness of the statements contained in the Registration Statement and the
Prospectus (except as specified in the foregoing opinion), on the basis of the
foregoing, no facts have come to the attention of such counsel which lead such
counsel to believe that the Registration Statement at the time it became
effective (except with respect to the financial statements and other information
of an accounting or financial nature included therein, or information relating
to oil and gas reserves and future net cash flows and other information derived
therefrom, as to which such counsel need express no belief) contained any untrue
statement of a material fact or omitted to state a material fact required to be
stated therein or necessary to make the statements therein not misleading, or
that the Prospectus as amended or supplemented (except with respect to the
financial statements and other information of an accounting or financial nature
included therein, or information relating to oil and gas reserves and future net
cash flows and other information derived therefrom, as to which such counsel
need make no statement) as of its date or as of the Closing Date contained or
contains any untrue statement of a material fact or omitted or omits to state a
material fact necessary in order to make the statements therein, in the light of
the circumstances under which they were made, not misleading.

          (h) All actions taken in connection with the sale of the Firm Shares
and the Option Shares as herein contemplated shall be reasonably satisfactory in
form and substance to the Representatives and their counsel and the Underwriters
shall have received from Andrews & Kurth L.L.P. a favorable opinion, addressed
to the Representatives and

                                       20

<PAGE>


dated such Closing Date, with respect to the Shares, the Registration
Statement and the Prospectus, and such other related matters, as the
Representatives may reasonably request, and the Company shall have furnished
to Andrews & Kurth L.L.P. such documents as they may reasonably request for
the purpose of enabling them to pass upon such matters.

          (i) The Representatives shall have received a copy of the lock-up
agreement in the form attached to this Agreement (the "Lock-Up Agreement"),
dated as of the date hereof, executed by each of David E. Mitchell, Stanley A.
Milner, Stephen C. Hurley, Edward L. Hahn, Esther S. Ondrack, James B. Lewis, S.
Jay Milner, Ronald J. Stefure, Hugh J. Kelly, John E. Maybin, Louis G. Munin and
Stuart T. Peeler.

          (j) The Representatives shall have received, at the time this
Agreement is executed and on each Closing Date, a signed letter from Netherland,
Sewell & Associates, Inc., addressed to the Representatives and dated,
respectively, the date of this Agreement and each such Closing Date, in form and
substance reasonably satisfactory to the Representatives.

          (k) The Company shall have furnished or caused to be furnished to the
Representatives such further certificates or documents as the Representatives
shall have reasonably requested.

          6. COVENANTS.

          (a) The Company covenants and agrees as follows:

               (i) The Company shall prepare the Prospectus in a form reasonably
          approved by the Representatives and file such Prospectus pursuant to
          Rule 424(b) under the Securities Act not later than the Commission's
          close of business on the second business day following the execution
          and delivery of this Agreement, or, if applicable, such earlier time
          as may be required under the Securities Act.

               (ii) The Company shall promptly advise the Representatives in
          writing (i) when any post-effective amendment to the Registration
          Statement shall have become effective, (ii) of any request by the
          Commission for any amendment to the Registration Statement or the
          Prospectus or for any additional information, (iii) of the prevention
          or suspension of the use of any Preliminary Prospectus or the
          Prospectus or of the issuance by the Commission of any stop order
          suspending the effectiveness of the Registration Statement or the
          institution or threatening of any proceeding known to the Company for
          that purpose, (iv) of the receipt by the Company of any notification
          with respect to the suspension of the qualification of the Shares for
          sale in any jurisdiction or the initiation or threatening of any
          proceeding known to the Company for such purpose, and (v) of the
          issuance by any securities regulatory authority in Canada or any
          stock exchange of any order having


                                       21

<PAGE>


          the effect of ceasing or suspending the trading in the Common Shares,
          or the initiation or threatening of any proceeding known to the
          Company for such purpose. The Company shall not file any amendment to
          the Registration Statement or supplement to the Prospectus unless the
          Company has furnished the Representatives with a copy for their review
          prior to filing and shall not file any such proposed amendment or
          supplement to which the Representatives reasonably object. The Company
          shall use its best efforts to prevent the issuance of any stop order
          and, if issued, to obtain as soon as possible the withdrawal thereof.

               (iii) If, at any time when a prospectus relating to the Shares is
          required to be delivered under the Securities Act and the Rules, any
          event occurs as a result of which the Prospectus as then amended or
          supplemented would include any untrue statement of a material fact or
          omit to state any material fact necessary to make the statements
          therein in the light of the circumstances under which they were made
          not misleading, or if it shall be necessary to amend or supplement the
          Prospectus to comply with the Securities Act or the Rules, the Company
          promptly shall prepare and file with the Commission, subject to the
          second sentence of paragraph (ii) of this Section 6(a), an amendment
          or supplement which shall correct such statement or omission or an
          amendment which shall effect such compliance.

               (iv) The Company shall make generally available to its security
          holders and to the Representatives as soon as practicable, but not
          later than 45 days after the end of the 12-month period beginning at
          the end of the fiscal quarter of the Company during which the
          Effective Date occurs (or 90 days if such 12-month period coincides
          with the Company's fiscal year), an earnings statement (which need not
          be audited) of the Company, covering such 12-month period, which shall
          satisfy the provisions of Section 11(a) of the Securities Act or Rule
          158 of the Rules.

               (v) The Company shall furnish to the Representatives and counsel
          for the Underwriters, without charge, conformed copies of the
          Registration Statement (including all exhibits thereto and amendments
          thereof) and to each other Underwriter a copy of the Registration
          Statement (without exhibits thereto) and all amendments thereof and,
          so long as delivery of a prospectus by an Underwriter or dealer may be
          required by the Securities Act or the Rules, as many copies of any
          Preliminary Prospectus and the Prospectus and any amendments thereof
          and supplements thereto as the Representatives may reasonably request.

               (vi) The Company shall cooperate with the Representatives and
          their counsel in endeavoring to qualify the Shares for offer and sale
          in connection with the offering under the laws of such jurisdictions
          in the United States as the Representatives may designate and shall
          maintain such qualifications in effect so long as required for the
          distribution of the Shares; provided, however, that the

                                       22

<PAGE>


          Company shall not be required in connection therewith, as a condition
          thereof, to qualify as a foreign corporation or to execute a general
          consent to service of process in any jurisdiction or subject itself
          to taxation as doing business in any jurisdiction.

               (vii) Without the prior written consent of CIBC World Markets
          Corp., for a period of 90 days after the date of this Agreement, the
          Company shall not issue, sell or register with the Commission (other
          than on Form S-8 or on any successor form), or otherwise dispose of,
          directly or indirectly, any equity securities of the Company (or any
          securities convertible into, exercisable for or exchangeable for
          equity securities of the Company), except for (1) the issuance of the
          Shares pursuant to the Registration Statement, (2) the granting of
          options pursuant to the Company's existing share option plan or bonus
          plan as described in the Registration Statement and the Prospectus
          (provided that such options shall not be exercisable within such
          90-day period), (3) the issuance of Common Shares pursuant to the
          exercise of existing options granted under the Company's share option
          plan and (4) the issuance of shares pursuant to the exercise of
          conversion rights attached to outstanding preferred shares issued by
          Chieftain International Funding Corp.

               (viii) On or before completion of this offering, the Company
          shall make all filings required under applicable securities laws and
          by the American Stock Exchange and The Toronto Stock Exchange.

               (ix) The Company will apply the net proceeds from the offering of
          the Shares in a manner consistent with the disclosure under "Use of
          Proceeds" in the Prospectus.

          (b) Each of the Underwriters covenants and agrees, severally and not
jointly, as follows:

               (i) It will not offer or sell the Shares, directly or
           indirectly, in Canada in violation of the securities laws of
           Canada or any province or territory of Canada.

               (ii) It will not offer or sell the Shares, directly or
          indirectly, within Canada except pursuant to prospectus exemptions
          under the applicable securities laws of Canada or any province or
          territory of Canada.

               (iii) It will obtain the agreement of any selling group members
          to comply with the foregoing provisions of this Section 6(b).

     Notwithstanding the foregoing provisions of this Section 6(b), no
     Underwriter shall be liable to the Company pursuant to this Section 6(b) as
     a result of the violation by another Underwriter or selling group member of
     this Section 6(b) if the former Underwriter is not itself in violation.

                                       23

<PAGE>



          (c) The Representatives will give prompt written notice to the Company
     when, in the opinion of the Representatives, the Underwriters have
     completed distribution of the Shares.

          (d) The Company agrees to pay, or reimburse if paid by the
     Representatives, whether or not the transactions contemplated hereby are
     consummated or this Agreement is terminated, all costs and expenses
     incident to the public offering in the United States and the previously
     proposed private placement of the Shares in Canada and the performance of
     the obligations of the Company under this Agreement including those
     relating to: (i) the preparation, printing, filing and distribution of the
     Registration Statement including all exhibits thereto, each Preliminary
     Prospectus, the Prospectus, the preliminary Canadian offering memorandum
     dated October 21, 1999 prepared in connection with the previously proposed
     private placement of the Shares in Canada (the "Preliminary Canadian
     Offering Memorandum"), amendments and supplements to the Registration
     Statement and the Prospectus; (ii) the preparation and delivery of
     certificates for the Shares to the Underwriters; (iii) the registration or
     qualification of the Shares for offer and sale under the state securities
     laws of the various jurisdictions referred to in Section 6(a)(vi); (iv) the
     furnishing (including costs of shipping and mailing) to the Representatives
     and to the Underwriters of copies of each Preliminary Prospectus, the
     Prospectus, the Preliminary Canadian Offering Memorandum and all amendments
     or supplements thereto, as may be reasonably requested for use in
     connection with the offering and sale of the Shares by the Underwriters or
     by dealers to whom Shares may be sold; (v) inclusion of the Shares for
     quotation or listing on the American Stock Exchange and The Toronto Stock
     Exchange; and (vi) all transfer taxes, if any, with respect to the sale and
     delivery of the Shares by the Company to the Underwriters. Subject to the
     provisions of Section 9, the Underwriters agree to pay, whether or not the
     transactions contemplated hereby are consummated or this Agreement is
     terminated, all costs and expenses incident to the performance of the
     obligations of the Underwriters under this Agreement not payable by the
     Company pursuant to the preceding sentence, including, without limitation,
     the fees and disbursements of counsel for the Underwriters.

          7. INDEMNIFICATION.

          (a) The Company agrees to indemnify and hold harmless each
     Underwriter, its affiliates and each person, if any, who controls any
     Underwriter within the meaning of Section 15 of the Securities Act or
     Section 20 of the Exchange Act against any and all losses, claims,
     damages and liabilities, joint or several (including any reasonable
     investigation, legal and other expenses incurred in connection with,
     and any amount paid in settlement of, any action, suit or proceeding or
     any claim asserted), to which they, or any of them, may become subject
     under the Securities Act, the Exchange Act or other federal or state law
     or regulation, under the Canadian securities laws, at common law or
     otherwise, insofar as such losses, claims, damages or liabilities
     arise out of or are based upon any untrue statement or alleged untrue
     statement of a material fact contained in any Preliminary


                                       24

<PAGE>


     Prospectus, the Registration Statement, the Prospectus or the Preliminary
     Canadian Offering Memorandum or any amendment thereof or supplement
     thereto, or arise out of or are based upon any omission or alleged
     omission to state therein a material fact required to be stated therein
     or necessary to make the statements therein not misleading; provided,
     however, that such indemnity shall not inure to the benefit of any
     Underwriter (or any person controlling such Underwriter) on account of any
     losses, claims, damages or liabilities arising from the sale of the Shares
     to any person by such Underwriter if such untrue statement or omission or
     alleged untrue statement or omission was made in such Preliminary
     Prospectus, the Registration Statement, the Preliminary Canadian Offering
     Memorandum or the Prospectus, or such amendment or supplement thereto in
     reliance upon and in conformity with information furnished in writing
     to the Company by the Representatives on behalf of any Underwriter
     specifically for use therein. This indemnity agreement will be in addition
     to any liability which the Company may otherwise have.

          (b) Each Underwriter agrees, severally and not jointly, to indemnify
     and hold harmless the Company, its affiliates and each person, if any, who
     controls the Company within the meaning of Section 15 of the Securities Act
     or Section 20 of the Exchange Act, each director of the Company, and each
     officer of the Company who signs the Registration Statement, to the same
     extent as the foregoing indemnity as set forth in Section 7(a) hereof from
     the Company to each Underwriter, but only insofar as such losses, claims,
     damages or liabilities arise out of or are based upon any untrue statement
     or omission or alleged untrue statement or omission which was made in any
     Preliminary Prospectus, the Registration Statement, the Preliminary
     Canadian Offering Memorandum or the Prospectus, or any amendment thereof or
     supplement thereto contained in (i) the paragraph regarding selling
     concessions and reallowances, except for the first sentence thereof, (ii)
     the stabilization information, and (iii) the paragraph regarding
     transactions by the Company with affiliates of CIBC World Markets Corp.,
     all of which are set forth under the sections captioned "Underwriting" that
     appear in each of the Registration Statement, the Preliminary Prospectus,
     the Prospectus and the Preliminary Canadian Offering Memorandum; provided,
     however, that the obligation of each Underwriter to indemnify the Company
     (including any controlling person, director or officer thereof) shall be
     limited to the net proceeds received by the Company from such Underwriter.

          (c) Any party that proposes to assert the right to be indemnified
     under this Section will, promptly after receipt of notice of commencement
     of any action, suit or proceeding against such party in respect of which a
     claim is to be made against an indemnifying party or parties under this
     Section, notify each such indemnifying party of the commencement of such
     action, suit or proceeding, enclosing a copy of all papers served. No
     indemnification provided for in Section 7(a) or 7(b) shall be available
     to any party who shall fail to give notice as provided in this Section
     7(c) if the party to whom notice was not given was unaware of the
     proceeding to which such notice would have related and was prejudiced by
     the failure to give such notice but the omission so to notify such
     indemnifying party of any such action, suit or proceeding shall not
     relieve it from any


                                       25

<PAGE>


     liability that it may have to any indemnified party for contribution or
     otherwise than under this Section. In case any such action, suit or
     proceeding shall be brought against any indemnified party and it shall
     notify the indemnifying party of the commencement thereof, the
     indemnifying party shall be entitled to participate in, and, to the extent
     that it shall wish, jointly with any other indemnifying party similarly
     notified, to assume the defense thereof, with counsel reasonably
     satisfactory to such indemnified party, and after notice from the
     indemnifying party to such indemnified party of its election so to assume
     the defense thereof and the approval by the indemnified party of such
     counsel, the indemnifying party shall not be liable to such indemnified
     party for any legal or other expenses, except as provided below and except
     for the reasonable costs of investigation subsequently incurred by such
     indemnified party in connection with the defense thereof. The indemnified
     party shall have the right to employ its counsel in any such action, but
     the fees and expenses of such counsel shall be at the expense of such
     indemnified party unless (i) the employment of counsel by such indemnified
     party has been authorized in writing by the indemnifying parties, (ii) the
     indemnified party shall have been advised by counsel that there may be one
     or more legal defenses available to it which are different from or in
     addition to those available to the indemnifying party (in which case the
     indemnifying parties shall not have the right to direct the defense of
     such action on behalf of the indemnified party) or (iii) the indemnifying
     parties shall not have employed counsel to assume the defense of such
     action within a reasonable time after notice of the commencement thereof,
     in each of which cases the fees and expenses of counsel shall be at the
     expense of the indemnifying parties. An indemnifying party shall not be
     liable for any settlement of any action, suit, proceeding or claim
     effected without its written consent, which consent shall not be
     unreasonably withheld or delayed.

          8. CONTRIBUTION. In order to provide for just and equitable
contribution in circumstances in which the indemnification provided for in
Section 7(a) or 7(b) is due in accordance with its terms but for any reason
is held to be unavailable to or insufficient to hold harmless an indemnified
party under Section 7(a) or 7(b), then each indemnifying party shall
contribute to the aggregate losses, claims, damages and liabilities
(including any investigation, legal and other expenses reasonably incurred in
connection with, and any amount paid in settlement of, any action, suit or
proceeding or any claims asserted, but after deducting any contribution
received by any person entitled hereunder to contribution from any person who
may be liable for contribution) to which the indemnified party may be subject
in such proportion as is appropriate to reflect the relative benefits
received by the Company on the one hand and the Underwriters on the other
from the offering of the Shares or, if such allocation is not permitted by
applicable law or indemnification is not available as a result of the
indemnifying party not having received notice as provided in Section 7
hereof, in such proportion as is appropriate to reflect not only the relative
benefits referred to above but also the relative fault of the Company on the
one hand and the Underwriters on the other in connection with the statements
or omissions that resulted in such losses, claims, damages, liabilities or
expenses, as well as any other relevant equitable considerations. The
relative benefits received by the Company and the Underwriters shall be
deemed to be in the same proportion as (x) the total proceeds from the
offering (net of underwriting discounts but before deducting expenses)
received by the Company, as

                                       26

<PAGE>


set forth in the table on the cover page of the Prospectus, bear to (y) the
Underwriting Commissions received by the Underwriters, as set forth in the
table on the cover page of the Prospectus. The relative fault of the Company
or the Underwriters shall be determined by reference to, among other things,
whether the untrue or alleged untrue statement of a material fact related to
information supplied by the Company or the Underwriters and the parties'
relative intent, knowledge, access to information and opportunity to correct
or prevent such statement or omission. The Company and the Underwriters agree
that it would not be just and equitable if contribution pursuant to this
Section 8 were determined by pro rata allocation (even if the Underwriters
were treated as one entity for such purpose) or by any other method of
allocation which does not take account of the equitable considerations
referred to above. Notwithstanding the provisions of this Section 8, (i) in
no case shall any Underwriter (except as may be provided in the Agreement
Among Underwriters) be liable or responsible for any amount in excess of the
Underwriting Commissions applicable to the Shares purchased by such
Underwriter hereunder; and (ii) the Company shall be liable and responsible
for any amount in excess of such Underwriting Commissions; provided, however,
that no person guilty of fraudulent misrepresentation (within the meaning of
Section 11(f) of the Securities Act) shall be entitled to contribution from
any person who was not guilty of such fraudulent misrepresentation. For
purposes of this Section 8, each affiliate of an Underwriter, each person, if
any, who controls an Underwriter within the meaning of Section 15 of the
Securities Act or Section 20(a) of the Exchange Act shall have the same
rights to contribution as such Underwriter, and each person, if any, who
controls the Company within the meaning of the Section 15 of the Securities
Act or Section 20(a) of the Exchange Act, each officer of the Company who
shall have signed the Registration Statement and each director of the Company
shall have the same rights to contribution as the Company, subject in each
case to clauses (i) and (ii) of the immediately preceding sentence of this
Section 8. Any party entitled to contribution will, promptly after receipt of
notice of commencement of any action, suit or proceeding against such party
in respect of which a claim for contribution may be made against another
party or parties under this Section, notify such party or parties from whom
contribution may be sought, but the omission so to notify such party or
parties from whom contribution may be sought shall not relieve the party or
parties from whom contribution may be sought from any other obligation it or
they may have hereunder or otherwise than under this Section. No party shall
be liable for contribution with respect to any action, suit, proceeding or
claim settled without its written consent, which consent shall not be
unreasonably withheld or delayed. The Underwriters' obligations to contribute
pursuant to this Section 8 are several in proportion to their respective
underwriting commitments and not joint.

          9. TERMINATION. This Agreement may be terminated with respect to the
Shares to be purchased on a Closing Date by the Representatives by notifying the
Company at any time:

          (a) in the absolute discretion of the Representatives at or before any
     Closing Date: (i) if on or prior to such date, any domestic or
     international event, act or occurrence has materially disrupted, or in the
     opinion of the Representatives will in the future materially disrupt, the
     securities markets and such event, act or occurrence makes it in the
     judgment of the Representatives, inadvisable to proceed with the offering;
     (ii) if there has occurred any new outbreak or material escalation of
     hostilities or other calamity or crisis

                                       27

<PAGE>


     the effect of which on the financial markets of the United States or
     Canada is such as to make it, in the judgment of the Representatives,
     inadvisable to proceed with the offering; (iii) if there shall be such
     a material adverse change in general financial, political or economic
     conditions or the effect of international conditions on the financial
     markets in the United States or Canada is such as to make it, in the
     judgment of the Representatives, inadvisable or impracticable to market
     the Shares; (iv) if trading in the Shares has been suspended by the
     Commission or any securities commission in Canada or trading generally
     on the New York Stock Exchange, Inc., The Toronto Stock Exchange, the
     American Stock Exchange, Inc. or the Nasdaq National Market has been
     suspended or limited, or minimum or maximum ranges for prices for
     securities shall have been fixed, or maximum ranges for prices for
     securities have been required, by said exchanges or by order of the
     Commission or any securities commission in Canada, the National Association
     of Securities Dealers, Inc., or any other governmental or regulatory
     authority; (v) if a banking moratorium has been declared by any state or
     Federal or Canadian authority; or (vi) if, in the judgment of the
     Representatives, there has occurred a Material Adverse Effect, or

          (b) at or before any Closing Date, that any of the conditions
     specified in Section 5 shall not have been fulfilled when and as required
     by this Agreement.

          If this Agreement is terminated pursuant to any of its provisions, the
Company shall not be under any liability to any Underwriter, and no Underwriter
shall be under any liability to the Company, except that (y) if this Agreement
is terminated by the Representatives or the Underwriters because of any failure,
refusal or inability on the part of the Company to comply with the terms or to
fulfill any of the conditions of this Agreement, the Company will reimburse the
Underwriters for all out-of-pocket expenses (including the reasonable fees and
disbursements of their counsel) incurred by them in connection with the proposed
purchase and sale of the Shares or in contemplation of performing their
obligations hereunder and (z) no Underwriter who shall have failed or refused to
purchase the Shares agreed to be purchased by it under this Agreement, without
some reason sufficient hereunder to justify cancellation or termination of its
obligations under this Agreement, shall be relieved of liability to the Company
or to the other Underwriters for damages occasioned by its failure or refusal.

          10. SUBSTITUTION OF UNDERWRITERS. If one or more of the
Underwriters shall fail (other than for a reason sufficient to justify the
cancellation or termination of this Agreement under Section 9) to purchase on
any Closing Date the Shares agreed to be purchased on such Closing Date by
such Underwriter or Underwriters, the Representatives may find one or more
substitute underwriters to purchase such Shares or make such other
arrangements as the Representatives may deem advisable or one or more of the
remaining Underwriters may agree to purchase such Shares in such proportions
as may be approved by the Representatives, in each case upon the terms set
forth in this Agreement. If no such arrangements have been made by the close
of business on the business day following such Closing Date,

                                       28

<PAGE>


          (a) if the number of Shares to be purchased by the defaulting
     Underwriters on such Closing Date shall not exceed 10% of the Shares that
     all the Underwriters are obligated to purchase on such Closing Date, then
     each of the nondefaulting Underwriters shall be obligated to purchase such
     Shares on the terms herein set forth in proportion to their respective
     obligations hereunder; provided, that in no event shall the maximum number
     of Shares that any Underwriter has agreed to purchase pursuant to Section 1
     be increased pursuant to this Section 10 by more than one-ninth of such
     number of Shares without the written consent of such Underwriter, or

          (b) if the number of Shares to be purchased by the defaulting
     Underwriters on such Closing Date shall exceed 10% of the Shares that all
     the Underwriters are obligated to purchase on such Closing Date, then the
     Company shall be entitled to one additional business day within which it
     may, but is not obligated to, find one or more substitute underwriters
     reasonably satisfactory to the Representatives to purchase such Shares upon
     the terms set forth in this Agreement.

          In any such case, either the Representatives or the Company shall have
the right to postpone the applicable Closing Date for a period of not more than
five business days in order that necessary changes and arrangements (including
any necessary amendments or supplements to the Registration Statement or
Prospectus) may be effected by the Representatives and the Company. If the
number of Shares to be purchased on such Closing Date by such defaulting
Underwriter or Underwriters shall exceed 10% of the Shares that all the
Underwriters are obligated to purchase on such Closing Date, and none of the
nondefaulting Underwriters or the Company shall make arrangements pursuant to
this Section within the period stated for the purchase of the Shares that the
defaulting Underwriters agreed to purchase, this Agreement shall terminate with
respect to the Shares to be purchased on such Closing Date without liability on
the part of any nondefaulting Underwriter to the Company and without liability
on the part of the Company, except in both cases as provided in Sections 6(d),
7, 8 and 9. The provisions of this Section 10 shall not in any way affect the
liability of any defaulting Underwriter to the Company or the nondefaulting
Underwriters arising out of such default. A substitute underwriter hereunder
shall become an Underwriter for all purposes of this Agreement.

          11. JUDGMENT CURRENCY. Unless otherwise specified, references to
dollar amounts in this Agreement are to United States dollars. The Company
agrees to indemnify each Underwriter, its affiliates and each person, if any,
who controls any Underwriter within the meaning of Section 15 of the
Securities Act or Section 20 of the Exchange Act (an "Underwriter
Indemnitee") against any loss incurred by an Underwriter Indemnitee as a
result of any judgment or order being given or made for liability hereunder
and such judgment or order being expressed and paid in a currency (the
"Judgment Currency") other than United States dollars and as a result of any
variation as between (i) the rate of exchange at which the United States
dollar amount is converted into the Judgment Currency for the purpose of such
judgment or order, and (ii) the rate of exchange at which the Underwriter
Indemnitee is able to purchase United States dollars with the amount of the
Judgment Currency actually received by the Underwriter Indemnitee. In
addition, the Underwriters, severally

                                       29

<PAGE>




and not jointly, agree to indemnify the Company, its affiliates and each person,
if any, who controls the Company within the meaning Section 15 of the Securities
Act or Section 20 of the Exchange Act (a "Company Indemnitee") against any loss
incurred by the Company Indemnitee as a result of any judgment or order being
given or made for liability hereunder and such judgment or order being expressed
and paid in a Judgment Currency other than United States dollars and as a result
of any variation as between (i) the rate of exchange at which the United States
dollar amount is converted into the Judgment Currency for the purpose of such
judgment or order, and (ii) the rate of exchange at which the Company Indemnitee
is able to purchase United States dollars with the amount of the Judgment
Currency actually received by the Company Indemnitee. The foregoing indemnities
of each of the Company and the Underwriters shall respectively constitute
separate and independent obligations of the Company and the Underwriters and
shall continue in full force and effect notwithstanding any such judgment or
order as aforesaid. The term "rate of exchange" shall include any premiums and
costs of exchange payable in connection with the purchase of, or conversion
into, the relevant currency.

          12. MISCELLANEOUS. The respective agreements, representations,
warranties, indemnities and other statements of the Company or its officers and
of the Underwriters set forth in or made pursuant to this Agreement shall remain
in full force and effect, regardless of any investigation made by or on behalf
of any Underwriter or the Company or any of the officers, directors or
controlling persons referred to in Sections 7 and 8 hereof, and shall survive
delivery of and payment for the Shares. The provisions of Sections 6(d), 7, 8, 9
and 11 shall survive the termination or cancellation of this Agreement.

          This Agreement has been and is made for the benefit of the
Underwriters and the Company, their respective successors and assigns, and, to
the extent expressed herein, for the benefit of affiliates of and persons
controlling any of the Underwriters, or the Company, and directors and officers
of the Company, and their respective successors and assigns, and no other person
shall acquire or have any right under or by virtue of this Agreement. The term
"successors and assigns" shall not include any purchaser of Shares from any
Underwriter merely because of such purchase.

          Unless otherwise specified, all notices and communications
hereunder shall be in writing and mailed or delivered or by telephone,
facsimile or telegraph if subsequently confirmed in writing, (a) if to the
Representatives, c/o CIBC World Markets Corp.,1600 Smith Street, Suite 3100,
Houston, Texas 77002, facsimile no: (713) 650-7670, Attention: Ron Ormond,
with a copy to Andrews & Kurth L.L.P., 600 Travis, Suite 4200, Houston, Texas
77002, facsimile no: (713) 220-4285, Attention: James M. Prince, Esq. and (b)
if to the Company, to Chieftain International, Inc. 1201 T D Tower 10088-102
Avenue, Edmonton, Alberta T5J 2Z1 Canada, facsimile no: (780) 429- 4681, with
copies to John L. Roach, Inc., 4150 Lincoln Plaza, 500 North Akard, Dallas,
Texas 75201, facsimile no: (214) 953-1968, and Cravath, Swaine & Moore,
Worldwide Plaza, 825 Eighth Avenue, New York, New York 10019, facsimile no:
(212) 474-3700, Attention: Thomas R. Brome, Esq., and to Bennett Jones, 4500
Bankers Hall East, 855-2nd Street S.W., Calgary, Alberta T2P 4K7 Canada,
facsimile no: (403) 298-3418, Attention: John S. Burns, Q.C.

                                       30
<PAGE>


          This Agreement shall be governed by and construed in accordance with
the laws of the State of New York without regard to principles of conflict of
laws.

          Each party hereto irrevocably submits to the non-exclusive
jurisdiction of any New York state or United States federal court sitting in the
Borough of Manhattan, New York City, New York, U.S.A., and any appellate court
from any thereof (the "Specified Courts"), over any suit, action or proceeding
brought arising out of or based upon this Agreement (a "Related Proceeding").
Each party hereto waives, to the fullest extent permitted by law, any objection
to Related Proceedings in such courts whether on the grounds of venue, residence
or domicile or on the ground that the Related Proceedings have been brought in
an inconvenient forum. The Company consents to process being served in any such
suit, action or proceeding by mailing, certified mail, return receipt requested,
a copy thereof to such party at the address in effect for notices hereunder, and
agrees that such services shall constitute good and sufficient service of
process and notice thereof. Nothing in this paragraph shall affect or limit any
right to serve process in any other manner permitted by law. Notwithstanding the
foregoing, any action based on this Agreement may be instituted by the
Underwriters or by any person who controls the Underwriters in any competent
court in Canada.

          This Agreement may be signed in any number of counterparts, each of
which shall be an original, with the same effect as if the signatures thereto
and hereto were upon the same instrument.


                                       31

<PAGE>


          Please confirm that the foregoing correctly sets forth the agreement
among us.

                                Very truly yours,

                                CHIEFTAIN INTERNATIONAL, INC.

                                By: /s/ S.A. Milner
                                   --------------------------------------------
                                Name:  S.A. Milner
                                     ------------------------------------------
                                Title: Pres & C.E.O.
                                      -----------------------------------------

Confirmed:

CIBC WORLD MARKETS CORP.
DAIN RAUSCHER INCORPORATED
A. G. EDWARDS & SONS, INC.

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

Acting on behalf of themselves and as
representatives of the several Underwriters
named in Schedule I annexed hereto.

By: CIBC WORLD MARKETS CORP.

By: /s/ Ronald D. Ormand
   --------------------------------
Name:  Ronald D. Ormand
     ------------------------------
Title: Managing Director
      -----------------------------


                                       32
<PAGE>

<TABLE>
<CAPTION>

                                   SCHEDULE I

                                                                                                         Number of Firm
                                                                                                              Shares
                                                                                                               To Be
Name                                                                                                         Purchased
- ----                                                                                                        ----------
<S>                                                                                                          <C>
CIBC World Markets Corp.......................................................................               1,062,500
Dain Rauscher Incorporated....................................................................                 531,250
A.G. Edwards & Sons, Inc......................................................................                 531,250
Howard, Weil, Labouisse, Friedrichs Incorporated..............................................                  50,000
Lehman Brothers Inc...........................................................................                  50,000
Prudential Securities Incorporated............................................................                  50,000
Petrie Parkman & Co...........................................................................                  50,000
J.C. Bradford & Co............................................................................                  25,000
Josephthal & Co. Inc..........................................................................                  25,000
Ladenburg Thalmann & Co. Inc..................................................................                  25,000
McDonald Investments Inc., a KeyCorp Company..................................................                  25,000
ScotiaMcLeod Inc..............................................................................                  25,000
Southcoast Capital L.L.C......................................................................                  25,000
Southwest Securities, Inc.....................................................................                  25,000
                                                                                                         -------------
                                                                                         Total               2,500,000
                                                                                                         -------------
                                                                                                         -------------

</TABLE>



<PAGE>

                                                                    Exhibit 23.1


                        [Letterhead of PricewaterhouseCoopers]



CONSENT OF INDEPENDENT ACCOUNTANTS




November 15, 1999


We hereby consent to the inclusion of our report dated February 4, 1999
on the consolidated financial statements of Chieftain International, Inc.
(the "Company") for the year ended December 31, 1998, included or
incorporated by reference, in each of (i) the Prospectus Supplement dated
November 10, 1999 relating to the sale by the Company of 2,500,000 of its
common shares (exclusive of over-allotment option) and (ii) the Prospectus
dated October 20, 1999 relating to the sale by the Company, from time to time,
of up to $300,000,000 of its common shares, preferred shares, debt securities
and warrants (the "Prospectus"). We also consent to the references to us under
the headings "Experts" in each of the Prospectus Supplement and the
Prospectus.






/s/ PricewaterhouseCoopers LLP

Chartered Accountants


<PAGE>

                                                                    Exhibit 23.2


              [Letterhead of Netherland, Sewell & Associates, Inc.]




           CONSENT OF INDEPENDENT PETROLEUM ENGINEERS AND GEOLOGISTS


     We hereby consent to the references to our firm, to the references to
our reports to Chieftain International Inc. (the "Company") and to the use
of our reports to the Company, included or incorporated by reference, in each
of (i) the Prospectus Supplement dated November 10, 1999 relating to the sale
by the Company of 2,500,000 of its common shares (exclusive of over-allotment
option) and (ii) the Prospectus dated October 20, 1999 relating to the sale
by the Company, from time to time, of up to $300,000,000 of its common
shares, preferred shares, debt securities and warrants.




                                       NETHERLAND, SEWELL & ASSOCIATES, INC.



                                       By: /s/ Frederic D. Sewell
                                          ----------------------------------
                                          Frederic D. Sewell
                                          President



Dallas, Texas
November 15, 1999

<PAGE>

                                                                   Exhibit 23.3

                                [Letterhead of]

                            CRAVATH, SWAINE & MOORE
                               [New York Office]






                                                               November 15, 1999


                         Chieftain International, Inc.
                         -----------------------------


Ladies & Gentlemen:

          We have acted as U.S. counsel to Chieftain International, Inc. (the
"Company") in connection with the preparation of each of (i) the Prospectus
Supplement dated November 10, 1999, relating to the sale by the Company of
2,500,000 of its common shares (exclusive of over-allotment option) and (ii)
the Prospectus dated October 20, 1999, relating to the sale by the Company,
from time to time, of up to $300,000,000 of its common shares, preferred
shares, debt securities and warrants (the "Prospectus").

          We hereby consent to the use of our name under the caption "Certain
Income Tax Considerations - United States Federal Income Tax Considerations"
contained in the Prospectus Supplement. We also consent to the references to
us under the headings "Legal Matters" that appear in each of the Prospectus
Supplement and the Prospectus.

                                                  Very truly yours,

                                                  /s/ Cravath, Swaine & Moore


Chieftain International, Inc.
    1201 TD Tower
        10088-102 Avenue
           Edmonton, Alberta T5J 2Z1
              CANADA

208A


<PAGE>

                                                                   Exhibit 23.4

                                [Letterhead of]

                                 BENNETT JONES




                                                               November 15, 1999


                         Chieftain International, Inc.
                         -----------------------------


Ladies and Gentlemen:

          We have acted as Canadian counsel to Chieftain International, Inc.
(the "Company") in connection with the preparation of each of (i) the
Prospectus Supplement dated November 10, 1999, relating to the sale by the
Company of 2,500,000 of its common shares (exclusive of over-allotment
option) and (ii) the Prospectus dated October 20, 1999, relating to the sale
by the Company, from time to time, of up to $300,000,000 of its common
shares, preferred shares, debt securities and warrants (the "Prospectus").

          We hereby consent to the use of our name under the caption "Canadian
Federal Income Tax Considerations for United States Residents" contained in
the Prospectus Supplement. We also consent to the use of our name under the
caption "Enforcement of Civil Liabilities" contained in the Prospectus.
Additionally, we consent to the references to us under the headings "Legal
Matters" that appear in each of the Prospectus Supplement and the Prospectus.

                                                  Very truly yours,

                                                  BENNETT JONES


                                                  By: /s/ John S. Burns
                                                      --------------------
                                                      John S. Burns, Q.C.


Chieftain International, Inc.
    1201 TD Tower
        10088-102 Avenue
           Edmonton, Alberta T5J 2Z1
              CANADA




<PAGE>

                                                                      Exhibit 99
                             PROSPECTUS SUPPLEMENT
                      TO PROSPECTUS DATED OCTOBER 20, 1999

                                2,500,000 SHARES

                                     [LOGO]

                         CHIEFTAIN INTERNATIONAL, INC.

                                 COMMON SHARES
                                $17.50 PER SHARE

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

Chieftain International, Inc. is offering 2,500,000 common shares. This is a
firm commitment underwriting.

Our common shares are listed on the American Stock Exchange and The Toronto
Stock Exchange under the symbol "CID." On November 10, 1999, the last reported
sales price of our common shares on the American Stock Exchange was U.S. $17.81
per share and on The Toronto Stock Exchange was Cdn. $26.50 per share.

INVESTING IN OUR COMMON SHARES INVOLVES RISKS. SEE "RISK FACTORS" ON PAGE S-14
OF THIS PROSPECTUS SUPPLEMENT AND ON PAGE 6 OF THE ACCOMPANYING PROSPECTUS.

<TABLE>
<CAPTION>
                                                PER SHARE             TOTAL
                                              --------------      --------------
<S>                                           <C>                 <C>
Price to the public.....................          $17.50           $43,750,000
Underwriting discount...................            0.96             2,400,000
Proceeds to Chieftain...................           16.54            41,350,000
</TABLE>

We have granted an over-allotment option to the underwriters. Under this option,
the underwriters may elect to purchase a maximum of 375,000 additional common
shares from us within 30 days following the date of this prospectus supplement
to cover over-allotments.

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

NEITHER THE SECURITIES AND EXCHANGE COMMISSION NOR ANY STATE SECURITIES
COMMISSION HAS APPROVED OR DISAPPROVED OF THESE SECURITIES OR DETERMINED IF THIS
PROSPECTUS SUPPLEMENT OR THE ACCOMPANYING PROSPECTUS IS TRUTHFUL OR COMPLETE.
ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.

CIBC WORLD MARKETS

               DAIN RAUSCHER WESSELS

                                A.G. EDWARDS & SONS, INC.

          The date of this prospectus supplement is November 10, 1999.
<PAGE>
                               TABLE OF CONTENTS

<TABLE>
<CAPTION>
                                                                PAGE
                                                              --------
<S>                                                           <C>
PROSPECTUS SUPPLEMENT
Prospectus Supplement Summary...............................     S-5
Risk Factors................................................    S-14
Use of Proceeds.............................................    S-16
Capitalization..............................................    S-17
Common Share Price Range and Dividend Policy................    S-18
Selected Consolidated Financial Data........................    S-19
Management's Discussion and Analysis of Financial Condition
  and Results of Operations.................................    S-21
Business and Properties.....................................    S-27
Management..................................................    S-36
Certain Income Tax Considerations...........................    S-39
Underwriting................................................    S-42
Legal Matters...............................................    S-44
Experts.....................................................    S-45
Transfer Agents and Registrars..............................    S-45
Index to Consolidated Financial Statements..................     F-1
</TABLE>

<TABLE>
<CAPTION>
                                                                PAGE
                                                              --------
<S>                                                           <C>
PROSPECTUS
About This Prospectus.......................................       3
Enforcement of Civil Liabilities............................       3
Where You Can Find More Information.........................       3
Forward-Looking Statements..................................       4
Chieftain...................................................       5
Risk Factors................................................       6
Ratios of Earnings to Fixed Charges.........................       8
Use of Proceeds.............................................       9
Description of Share Capital................................       9
Description of Debt Securities..............................      14
Description of Warrants.....................................      19
Plan of Distribution........................................      21
Legal Matters...............................................      22
Experts.....................................................      22
</TABLE>

                                      S-3
<PAGE>
                        ABOUT THIS PROSPECTUS SUPPLEMENT

This document is in two parts. The first part is the prospectus supplement,
which describes our business and the specific terms of this offering. The second
part, the base prospectus, gives more general information, some of which may not
apply to this offering. Generally, when we refer only to the "prospectus," we
are referring to both parts combined.

IF THE DESCRIPTION OF THE OFFERING VARIES BETWEEN THE PROSPECTUS SUPPLEMENT AND
THE BASE PROSPECTUS, YOU SHOULD RELY ON THE INFORMATION IN THE PROSPECTUS
SUPPLEMENT.

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

                   CERTAIN DEFINITIONS AND OTHER INFORMATION

As used in this prospectus supplement and the accompanying prospectus, the terms
"Chieftain," "we," "us" and "our" refer to Chieftain International, Inc., a
company organized under the laws of the Province of Alberta, Canada, and its
subsidiaries (unless the context indicates a different meaning), and the term
"common shares" and "shares" means Chieftain's common shares, no par value.
Unless otherwise stated, all information contained in this prospectus supplement
and the accompanying prospectus assumes no exercise of the over-allotment option
granted to the underwriters.

As used in this prospectus supplement, "Bcf" means 1,000,000,000 cubic feet of
natural gas, "Bcfe" means 1,000,000,000 cubic feet of natural gas equivalent,
"MBbls" means 1,000 barrels of crude oil, condensate and natural gas liquids,
"Mcf" means 1,000 cubic feet of natural gas, "Mcfe" means 1,000 cubic feet of
natural gas equivalent using a ratio of 1 barrel = 6,000 cubic feet of natural
gas, "MMcf" means 1,000,000 cubic feet and "MMcfe" means 1,000,000 cubic feet of
natural gas equivalent.

All production numbers set forth in this prospectus supplement, whether amounts,
costs, revenues or otherwise, are reported net of royalties, unless otherwise
indicated.

UNLESS OTHERWISE SPECIFIED OR THE CONTEXT OTHERWISE REQUIRES, ALL DOLLAR AMOUNTS
IN THIS PROSPECTUS SUPPLEMENT AND THE PROSPECTUS ARE EXPRESSED IN U.S. DOLLARS.

Our principal executive offices are located at 1201 TD Tower, 10088-102 Avenue,
Edmonton, Alberta, Canada T5J 2Z1 and our telephone number is (780) 425-1950.

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

THE COMMON SHARES HAVE NOT BEEN AND WILL NOT BE QUALIFIED FOR PUBLIC
DISTRIBUTION UNDER THE SECURITIES LAWS OF CANADA OR ANY PROVINCE OR TERRITORY IN
CANADA. THE COMMON SHARES ARE NOT BEING AND MAY NOT BE, OFFERED OR SOLD,
DIRECTLY OR INDIRECTLY, IN CANADA IN VIOLATION OF THE SECURITIES LAWS OF CANADA
OR ANY PROVINCE OR TERRITORY OF CANADA.

                                      S-4
<PAGE>
                         PROSPECTUS SUPPLEMENT SUMMARY

THIS PROSPECTUS SUPPLEMENT SUMMARY HIGHLIGHTS SELECTED INFORMATION FROM THIS
PROSPECTUS SUPPLEMENT BUT MAY NOT CONTAIN ALL OF THE INFORMATION THAT IS
IMPORTANT TO YOU. THIS PROSPECTUS SUPPLEMENT INCLUDES SPECIFIC TERMS OF THE
OFFERING OF OUR COMMON SHARES, INFORMATION ABOUT OUR BUSINESS AND FINANCIAL
DATA. WE ENCOURAGE YOU TO READ THIS PROSPECTUS SUPPLEMENT AND THE ACCOMPANYING
PROSPECTUS, INCLUDING THE "RISK FACTORS" SECTIONS IN BOTH OF THESE DOCUMENTS,
AND THE DOCUMENTS WE INCORPORATE BY REFERENCE, BEFORE MAKING AN INVESTMENT
DECISION.

                                  THE COMPANY

Chieftain International, Inc. is an independent energy company engaged in the
exploration, development and production of natural gas and oil. Our producing
properties and exploration acreage are primarily located in the shallow waters
of the U.S. Gulf of Mexico. We also have properties located onshore in
Louisiana, in the Four Corners area of southeast Utah and in the U.K. sector of
the North Sea.

We have assembled a large natural gas and oil lease acreage position in the Gulf
of Mexico. Our lease interests in the Gulf of Mexico include a balanced
portfolio of exploration and development drilling prospects. These prospects
range from high-impact prospects with relatively greater risks, which we believe
have the potential to add substantially to our reserves, to relatively lower
risk development and exploitation projects with lower reserve potential. Our
exploration efforts are supported by an extensive 3-D seismic database covering
most of our leases. We believe that our seismic database and related
technological expertise have contributed to our successful exploration and
development track record. We believe our conservative capital structure provides
us with the financial flexibility to take advantage of our prospects and other
opportunities, including acquisitons of leasehold acreage and producing
properties.

We hold interests in 133 lease blocks located on the continental shelf of the
Gulf of Mexico. We also have interests in ten deep-water blocks. Of these lease
blocks, 94 are held as exploratory acreage and 49 are held by production. We
operate 38 of these blocks. Our average working interest in our Gulf of Mexico
leases is approximately 40%. In the third quarter of 1999, we had net production
of 75.9 MMcfe per day in the Gulf of Mexico, which represented approximately 77%
of our total production.

In addition to our Gulf of Mexico properties, we own various interests in two
large light oil producing units in the Four Corners area of southeast Utah where
we had net production of 1,774 barrels per day in the third quarter of 1999. We
own an interest in approximately 9,600 net acres in the U.K sector of the North
Sea where we had net production of 10.5 MMcfe per day in the third quarter of
1999. We are also active in exploratory activities onshore in Louisiana.

At December 31, 1998, we had estimated proved reserves of 207.9 Bcfe. These
reserves had a present value of net cash flows before income taxes, discounted
at 10%, of $152.5 million using constant natural gas and oil prices in effect on
December 31, 1998, which averaged $2.12 per Mcf for natural gas and $9.72 per
barrel for oil. If our realized natural gas and oil prices in effect at
September 30, 1999 were used in this determination, assuming no other changes,
our estimated proved reserves at December 31, 1998, would have increased to
222.7 Bcfe and the present value of net cash flows before income taxes,
discounted at 10%, would have increased to $279.0 million. Our average realized
prices for our production at September 30, 1999 were $2.58 per Mcf for natural
gas and $20.16 per barrel for oil. At December 31, 1998, approximately 62% of
our proved reserves were natural gas and approximately 70% of our proved
reserves were developed. Our total proved reserves at December 31, 1998 had a
reserves-to-production ratio of approximately 6.8 years.

                                      S-5
<PAGE>
We have experienced substantial growth in proved reserves, production, revenue
and cash flow as demonstrated by the following:

 - Since 1994, our overall drilling success rate has been 74% and our drilling
   success rate for exploratory wells has been 40%. For the nine months ended
   September 30, 1999, our overall drilling success rate was 73% and our
   drilling success rate for exploratory wells was 62%.

 - Since 1994, we have added proved reserves of 235 Bcfe, of which 127 Bcfe has
   been from drilling, 72 Bcfe has been from acquisitions and 36 Bcfe has been
   from upward revisions of previous estimates.

 - Since 1994, we have replaced 208% of our production.

 - We have increased our average daily production 157% to 98.3 MMcfe per day in
   the third quarter of 1999 from 38.2 MMcfe per day in 1994.

 - We have increased our net production revenue 18% to $53.0 million for the
   first nine months of 1999 from $44.9 million for the first nine months of
   1998.

 - We have increased our EBITDA 24% to $39.2 million for the first nine months
   of 1999 from $31.6 million for the first nine months of 1998.

                                 OUR STRENGTHS

We believe that our historical success and future performance are directly
related to the following combination of strengths:

 - SUBSTANTIAL INVENTORY OF DRILLING PROJECTS IN THE GULF OF MEXICO.  In the
   Gulf of Mexico, we have generated an inventory of over 45 drilling locations,
   of which 36 are exploratory. Substantially all of these locations have been
   evaluated and defined using 3-D seismic data. Our large inventory permits us
   to be flexible in project selection and in the timing of drilling. By
   identifying new exploration targets and acquiring additional acreage, we
   continually add to our drilling inventory.

 - PROVEN EXPLORATORY EXPERTISE.  Our ability to define and participate in
   successful exploratory prospects in the Gulf of Mexico is demonstrated by our
   exploratory drilling success rate in the Gulf of Mexico of 83% over the nine
   months ended September 30, 1999.

 - EXPERIENCED TECHNICAL TEAM.  Our technical team is comprised of highly
   respected industry professionals with an average of 22 years of industry
   experience. We believe our exploration success is a direct result of this
   team's engineering and technical analyses.

 - FINANCIAL FLEXIBILITY.  With the net proceeds of this offering, we will have
   the ability to repay substantially all of our outstanding indebtedness,
   resulting in approximately $95 million of availability under our revolving
   credit facility. We seek to maintain low levels of debt in order to respond
   quickly to drilling or acquisition opportunities.

                                  OUR STRATEGY

Our strategy is to increase our reserves, production, revenue and cash flow
through exploration and development drilling and through the acquisition of
leasehold acreage and producing properties. The elements of our strategy include
the following:

 - FOCUS ON THE GULF OF MEXICO.  We focus our operations on the Gulf of Mexico
   where we have acquired a significant exploration acreage position and
   assembled a substantial 3-D seismic database. We believe this region combines
   significant geological potential, reservoir size, quality

                                      S-6
<PAGE>
   and deliverability with favorable commodity pricing and attractive finding,
   development and operating costs.

 - GROW THROUGH EXPLORATION.  We are pursuing an active technology-driven
   exploration program that is designed to balance projects with lower risk and
   moderate potential with drilling prospects which have higher risk and
   substantial potential. We generate exploration prospects through geological
   and geophysical analysis of 3-D seismic and other data and also review
   prospects generated by others. Currently, we have budgeted approximately
   $18.6 million for exploration and development capital expenditures for the
   fourth quarter of 1999 and we expect to use $14.9 million of this amount for
   exploration activities. We are currently drilling or plan to drill
   approximately 15 exploratory and development wells in the Gulf of Mexico and
   in the Gulf Coast area during the fourth quarter of 1999. We have budgeted
   approximately $86.2 million for exploration and development capital
   expenditures for 2000, $50.0 million of which we expect to use for
   exploration activities.

 - MANAGE DRILLING RISKS THROUGH JOINT VENTURES AND THE USE OF ADVANCED
   TECHNOLOGIES.  We seek to limit our financial and operating risks in selected
   projects by participating in drilling with industry partners and operators.
   We believe this strategy limits our risk exposure in high potential
   prospects. Additionally, we have increasingly relied on advanced
   technologies, including 3-D seismic analysis, to define geologic risks,
   thereby enhancing the results of our drilling efforts. We also seek to
   operate our projects in order to better control drilling costs and the timing
   of drilling.

 - EVALUATE AND PURSUE STRATEGIC ACQUISITIONS.  We continually review
   opportunities to acquire leasehold acreage and producing properties. We seek
   to acquire properties that we believe have significant exploration potential
   and to increase our working interest in producing lease blocks when available
   to us on economically favorable terms.

                           RECENT DRILLING ACTIVITIES

HIGH ISLAND.  In August 1999, we announced that our exploratory well on High
Island Blocks A-510/A-531, located offshore Texas in the Gulf of Mexico,
resulted in an oil and natural gas discovery. This well was drilled to a total
depth of 11,107 feet and encountered more than approximately 260 net feet of
hydrocarbon-bearing pay in multiple zones. We are now drilling an additional
well on Block A-510 and will then design and install production facilities. We
operate, and have a 50% working interest in, this project.

NORTHEAST WRIGHT FIELD.  The Broussard No. 1 well located onshore in south
Louisiana in Vermilion Parish was drilled to a measured depth of 18,340 feet in
early October 1999 and production liner has been run to total depth. This well
encountered a significant accumulation of natural gas-bearing high quality
reservoir rock. It was drilled as a delineation well to confirm and extend
natural gas reserves discovered in the D. W. Guidry No. 1 well located
approximately one mile to the north. Completion procedures are in progress and
we expect production from the Broussard No. 1 well to commence during the fourth
quarter of 1999. Production facilities and flow lines in the field are being
expanded to accommodate increased production volumes and additional drilling is
planned to fully develop the field. We own a 50% interest in the Broussard
No. 1 well and approximately 3,100 acres in the Northeast Wright Field.

VERMILION 267.  We have a 60% working interest in the Vermilion 267 No. 1
natural gas discovery well located offshore Louisiana in the Gulf of Mexico.
This well reached a total depth of 13,370 feet in early October 1999 and
encountered approximately 52 feet of high quality net effective hydrocarbon-
bearing reservoir rock. This well has been cased for production and the design
of production facilities is in progress. Additional exploratory and development
drilling is planned to fully develop the block.

                                      S-7
<PAGE>
                            RECENT OPERATING RESULTS

Operating results for the three months ended September 30, 1999 reflect
increases in production volumes and prices for both natural gas and oil compared
with the third quarter of 1998. Our average daily production of natural gas and
oil increased 29% to 98 MMcfe (118 MMcfe before royalties) for the third quarter
of 1999 from 76 MMcfe (94 MMcfe before royalties) for the third quarter of 1998.
Average natural gas prices that we received increased 15% to $2.26 per Mcf for
the third quarter of 1999 from $1.96 per Mcf for the third quarter of 1998.
Average oil prices that we received increased 63% to $19.31 per barrel for the
third quarter of 1999 from $11.86 per barrel for the third quarter of 1998.
Total revenue increased 63% to $22.8 million for the third quarter of 1999 from
$13.9 million for the third quarter of 1998. Higher production, coupled with
higher natural gas and oil prices, resulted in cash flow from operations of
$16.3 million for the third quarter of 1999, compared to $7.3 million for the
third quarter of 1998, and net income of $1.3 million for the third quarter of
1999 compared to a loss of $2.5 million for the third quarter of 1998.

                                      S-8
<PAGE>
                                  THE OFFERING

<TABLE>
<S>                                            <C>
Common shares offered........................  2,500,000 shares

Common shares to be outstanding after the
  offering...................................  15,849,059 shares

Use of proceeds..............................  To fund the development of our existing
                                               reserves, to increase our exploration program
                                               and possibly to acquire oil and natural gas
                                               properties. Until funds are required for such
                                               purposes, the proceeds may be used to repay
                                               bank indebtedness or may be invested in
                                               short-term money market instruments. See "Use
                                               of Proceeds."

American Stock Exchange and The Toronto Stock
  Exchange symbol............................  CID
</TABLE>

The number of outstanding shares shown above is based on 13,349,059 outstanding
shares at September 30, 1999 and excludes:

 - up to 375,000 shares that may be sold to the underwriters upon exercise of
   their over-allotment option;

 - 1,123,189 shares that may be issued pursuant to share options outstanding as
   of September 30, 1999; and

 - up to 3,408,375 shares reserved for issuance upon conversion of our
   subsidiary's $1.8125 cumulative redeemable preferred shares.

                                      S-9
<PAGE>
                   SUMMARY CONSOLIDATED FINANCIAL INFORMATION

The summary consolidated financial information below has been derived from our
audited consolidated financial statements for annual and year-end data, and from
our unaudited consolidated condensed financial statements for interim-period
data. Our financial statements are prepared using Canadian generally accepted
accounting principles. Our reporting currency is U.S. dollars. For a discussion
of the effect of the differences between Canadian and U.S. generally accepted
accounting principles, see footnote 2 to the table below, Note 11 to the audited
consolidated financial statements and Note 7 to the unaudited consolidated
condensed financial statements which are included elsewhere in this prospectus
supplement. The results of operations for the nine months ended September 30,
1999 should not be regarded as indicative of results for the full year.

<TABLE>
<CAPTION>
                                                      NINE MONTHS
                                                         ENDED
                                                     SEPTEMBER 30,                        YEAR ENDED DECEMBER 31,
                                                 ----------------------    ------------------------------------------------------
                                                   1999         1998          1998        1997       1996       1995       1994
                                                 --------    ----------    ----------   --------   --------   --------   --------
                                                      (UNAUDITED)
                                                            (U.S. $ IN THOUSANDS, EXCEPT SHARES AND PER SHARE AMOUNTS)
    <S>                                          <C>         <C>           <C>          <C>        <C>        <C>        <C>
    INCOME STATEMENT DATA:
      Revenues:
        Production revenue.....................  $ 64,236     $ 54,489      $ 74,861    $ 84,219   $ 72,838   $ 31,733   $ 35,960
          Less: royalties......................    11,282        9,637        13,246      14,592     12,226      5,058      5,841
                                                 --------     --------      --------    --------   --------   --------   --------
        Production revenue, net of royalties...    52,954       44,852        61,615      69,627     60,612     26,675     30,119
        Interest income and other..............       570        2,613(1)      2,776(1)    2,428      2,487      4,396      4,757
                                                 --------     --------      --------    --------   --------   --------   --------
          Total................................    53,524       47,465        64,391      72,055     63,099     31,071     34,876
      Costs and expenses:
        Production costs.......................    10,985       12,219        16,355      13,325     12,220      9,563      8,839
        General and administrative expenses....     3,354        3,668         4,796       4,308      3,972      3,346      3,402
        Interest...............................     1,867          285           437          --         --         --         --
        Depletion and amortization(2)..........    38,711       30,096        42,081      36,951     30,920     18,779     21,527
        Additional depletion(2)(3).............    11,393           --         6,244          --         --         --     15,434
                                                 --------     --------      --------    --------   --------   --------   --------
          Total................................    66,310       46,268        69,913      54,584     47,112     31,688     49,202
                                                 --------     --------      --------    --------   --------   --------   --------
      Income (loss) before income taxes and
        dividends on preferred shares of a
        subsidiary(4)..........................   (12,786)       1,197        (5,522)     17,471     15,987       (617)   (14,326)
      Provision (benefit) for income taxes
        Current................................         8           27            14           7        124         34         46
        Deferred...............................    (5,416)       1,114        (1,423)      7,304      6,079        124     (4,844)
                                                 --------     --------      --------    --------   --------   --------   --------
          Total................................    (5,408)       1,141        (1,409)      7,311      6,203        158     (4,798)
                                                 --------     --------      --------    --------   --------   --------   --------
      Income (loss) before dividends on
        preferred shares of a subsidiary.......    (7,378)          56        (4,113)     10,160      9,784       (775)    (9,528)
      Dividends on preferred shares of a
        subsidiary(4)..........................     3,707        3,707         4,942       4,942      4,942      4,942      4,942
                                                 --------     --------      --------    --------   --------   --------   --------
      Income (loss) applicable to common
        shares(2)..............................  $(11,085)    $ (3,651)     $ (9,055)   $  5,218   $  4,842   $ (5,717)  $(14,470)
                                                 ========     ========      ========    ========   ========   ========   ========
      Earnings (loss) per common share basic
        and fully diluted(2)...................  $  (0.83)    $  (0.27)     $  (0.67)   $   0.38   $   0.37   $  (0.54)  $  (1.32)
                                                 ========     ========      ========    ========   ========   ========   ========
      Weighted average number of common shares
        outstanding (000's)....................    13,350       13,521        13,480      13,621     13,065     10,633     10,986
                                                 ========     ========      ========    ========   ========   ========   ========
    OTHER FINANCIAL DATA:
      EBITDA(5)................................  $ 39,185     $ 31,578      $ 43,240    $ 54,422   $ 46,907   $ 18,162   $ 22,635
      Cash flow from operations................    33,603       27,559        37,847      49,473     41,841     13,186     17,647
      Net natural gas and oil capital
        expenditures...........................    36,187       66,198        92,573      69,453     57,673    100,502     28,059
    BALANCE SHEET DATA (AT END OF PERIOD):
      Working capital..........................  $  4,709     $  4,032      $  2,392    $ 22,676   $ 42,854   $ 11,216   $103,225
      Total assets(2)..........................   307,863      300,281       318,584     285,125    267,442    204,555    211,032
      Long-term debt...........................    45,000       25,000        40,000          --         --         --         --
      Shareholders' equity(2)..................   223,789      240,898       234,946     249,466    244,122    190,534    200,754
</TABLE>

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

(1) Includes a $1.6 million court awarded claim for recovery of past years'
    excess transportation charges.

                                      S-10
<PAGE>
(2) The use of U.S. generally accepted accounting principles results in the
    following:

<TABLE>
<CAPTION>
                                                 NINE MONTHS
                                                    ENDED
                                                SEPTEMBER 30,                    YEAR ENDED DECEMBER 31,
                                             -------------------   ----------------------------------------------------
                                               1999       1998       1998       1997       1996       1995       1994
                                             --------   --------   --------   --------   --------   --------   --------
                                                 (UNAUDITED)
                                                          (U.S. $ IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)
<S>                                          <C>        <C>        <C>        <C>        <C>        <C>        <C>
Depletion and amortization.................  $ 25,589   $ 27,465   $ 37,846   $ 33,774   $ 28,539   $ 16,004   $ 17,691
Additional depletion*......................    18,497     24,725     95,397         --         --      6,740     18,245
Net income (loss) applicable to
  common shares............................    (6,723)   (18,296)   (63,963)     7,510      6,202     (7,862)   (13,710)
Net income (loss) per common share:
  Basic....................................     (0.50)     (1.35)     (4.75)      0.55       0.47      (0.74)     (1.25)
  Fully diluted............................     (0.50)     (1.35)     (4.75)      0.54       0.46      (0.74)     (1.25)
Total assets...............................   232,022    261,500    238,675    269,178    245,763    186,682    195,136
Shareholders' equity.......................    98,523    151,533    105,318    174,746    167,110    112,162    124,527
</TABLE>

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

  * These amounts reflect non-cash write-downs in accordance with full cost
    accounting rules under U.S. generally accepted accounting principles.

(3) These amounts reflect non-cash write-downs of the carrying value of natural
    gas and oil properties in accordance with full cost accounting rules under
    Canadian generally accepted accounting principles. A write-down of U.S.
    property carrying costs, at December 31, 1998, of $16.5 million would have
    been required had December 31, 1998 prices ($2.15 per Mcf and $9.72 per
    barrel) been used. A write-down of U.S. property carrying costs at
    December 31, 1994 of $16.8 million would have been required had
    December 31, 1994 prices ($1.62 per Mcf for natural gas and $16.50 per
    barrel for oil and natural gas liquids) been used.

(4) In 1992, our subsidiary, Chieftain International Funding Corp., sold
    2,726,700 of its $1.8125 cumulative convertible redeemable preferred shares
    at $25.00 per share. The preferred shares are redeemable, at the option of
    the subsidiary, and are convertible at any time into 1.25 common shares of
    Chieftain at the option of the holder.

(5) EBITDA represents income before interest expense, income taxes, depletion
    and amortization (including all amounts for additional depletion) and
    dividends paid on preferred shares of a subsidiary. We have reported EBITDA
    because we believe EBITDA is a measure commonly reported and widely used by
    investors as an indicator of a company's operating performance and ability
    to incur and service debt. We believe EBITDA assists investors in comparing
    a company's performance on a consistent basis without regard to depletion
    and amortization, which can vary significantly depending upon accounting
    methods or nonoperating factors such as historical cost. EBITDA is not a
    calculation based on Canadian or U.S. generally accepted accounting
    principles and should not be considered an alternative to net income in
    measuring our performance or used as an exclusive measure of cash flow
    because it does not consider the impact of working capital growth, capital
    expenditures, debt principal reductions and other sources and uses of cash
    which are disclosed in our Consolidated Statement of Changes in Financial
    Position and Consolidated Condensed Statement of Cash Flows. Investors
    should carefully consider the specific items included in our computation of
    EBITDA. While EBITDA has been disclosed herein to permit a more complete
    comparative analysis of our operating performance and debt servicing ability
    relative to other companies, investors should be cautioned that EBITDA as
    reported by us may not be comparable in all instances to EBITDA as reported
    by other companies. EBITDA amounts may not be fully available for
    management's discretionary use, due to certain requirements to conserve
    funds for capital expenditures, debt service and other commitments.

                                      S-11
<PAGE>
                      SUMMARY RESERVES AND PRODUCTION DATA

The following tables set forth certain summary information with respect to
estimates of our oil and natural gas reserves and data about production and
sales of oil and natural gas for the periods indicated. Our estimates of U.S.
oil and natural gas reserves, the future net revenues therefrom and their
discounted present value at a rate of 10%, or PV-10 Value, have been prepared by
Netherland, Sewell & Associates, Inc., independent petroleum engineers. Such
information regarding U.K. reserves has been prepared by our personnel. U.K.
reserves comprise 5% of our total reserves on a Bcfe basis. See "Risk Factors"
in this prospectus supplement and in the accompanying prospectus and "Business
and Properties."

<TABLE>
<CAPTION>
                                                                                 AS AT DECEMBER 31,
                                                              --------------------------------------------------------
    <S>                                                       <C>            <C>        <C>        <C>        <C>
                                                                1998           1997       1996       1995      1994
                                                              --------       --------   --------   --------   -------
    ESTIMATED PROVED OIL AND NATURAL GAS RESERVES(1):
      Net natural gas reserves (MMcf):
        Proved developed....................................    99,432         89,139     86,997     85,705    33,581
        Proved undeveloped..................................    29,641         35,958     39,804     40,986    25,155
                                                              --------       --------   --------   --------   -------
          Total.............................................   129,073        125,097    126,801    126,691    58,736
                                                              ========       ========   ========   ========   =======
      Net oil reserves (MBbls):
        Proved developed....................................     7,534          8,397      8,397      7,509     5,588
        Proved undeveloped..................................     5,600          2,916        907        943       797
                                                              --------       --------   --------   --------   -------
          Total.............................................    13,134         11,313      9,304      8,452     6,385
                                                              ========       ========   ========   ========   =======
      Total proved oil and natural gas reserves
        (MMcfe)(2)..........................................   207,877        192,975    182,625    177,403    97,046
                                                              ========       ========   ========   ========   =======
    ESTIMATED PRESENT VALUE OF PROVED RESERVES (U.S. $ IN
      THOUSANDS):
      Proved developed......................................  $135,867       $187,697   $218,961   $111,608   $43,595
      Proved undeveloped....................................    16,641         50,615     85,335     40,096    19,333
                                                              --------       --------   --------   --------   -------
        Total PV-10 Value (before income taxes).............  $152,508(3)    $238,312   $304,296   $151,704   $62,928
                                                              ========       ========   ========   ========   =======
        Standardized measure of discounted estimated future
          net cash flows after income taxes(4)..............  $152,508       $199,573   $239,023   $137,494   $60,374
                                                              ========       ========   ========   ========   =======
    PRICES USED IN CALCULATING END OF YEAR PROVED RESERVES:
      U.S. natural gas reserves (per Mcf)...................  $   2.15       $   2.74   $   3.43   $   2.06   $  1.62
      U.K. natural gas reserves (per Mcf)...................      1.74           1.76       2.04       0.86      2.25
      Oil (per barrel)......................................      9.72          16.69      24.03      18.48     16.50

    OTHER RESERVE DATA(1):
      Reserve replacement rate(5)...........................       136%           240%       278%       260%       83%
      Natural gas as a percent of total proved
        reserves(2).........................................        62%            65%        69%        71%       61%
      Proved developed reserves as a percent of total proved
        reserves(2).........................................        70%            72%        75%        74%       69%
</TABLE>

                                      S-12
<PAGE>

<TABLE>
<CAPTION>
                                                                 NINE
                                                                MONTHS
                                                                ENDED                      YEAR ENDED DECEMBER 31,
                                                            SEPTEMBER 30,    ----------------------------------------------------
                                                                 1999          1998       1997       1996       1995       1994
                                                            --------------   --------   --------   --------   --------   --------
    <S>                                                     <C>              <C>        <C>        <C>        <C>        <C>
    NET AVERAGE DAILY SALES VOLUME:
      Natural gas (MMcf per day)..........................        70.0          67.1       64.2       59.8       29.5       28.4
      Oil and natural gas liquids (barrels per day).......       3,995         3,012      2,261      2,005      1,643      1,631
        Total production (MMcfe per day)(2)...............        93.9          85.2       77.8       71.8       39.3       38.2

    WEIGHTED AVERAGE SALES PRICES:
      Natural gas (per Mcf)...............................      $ 1.89        $ 1.99     $ 2.33     $ 2.09     $ 1.54     $ 1.97
      Oil and natural gas liquids (per barrel)............       15.62         11.74      18.94      20.99      16.94      15.86

    SELECTED DATA PER MCFE:
      Production costs....................................      $ 0.43        $ 0.53     $ 0.47     $ 0.46     $ 0.67     $ 0.63
      General and administrative expenses.................        0.13          0.15       0.15       0.15       0.23       0.24
</TABLE>

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

(1) All reserve quantities are shown net of royalties.

(2) Oil is converted into natural gas equivalents using a conversion ratio of 6
    Mcf of natural gas to 1 barrel of oil.

(3) If our realized prices in effect at September 30, 1999, were used in this
    determination, proved reserves would have increased to 222.7 Bcfe and PV-10
    Value would have increased to $279.0 million.

(4) At December 31, 1998, no income taxes would be payable at these natural gas
    and oil price levels.

(5) Calculated for a three-year period ending with the year presented by
    dividing the increase in net reserves, including any revisions of those
    reserves, by the production quantities for such period.

                                      S-13
<PAGE>
                                  RISK FACTORS

An investment in our common shares involves significant risks. You should
carefully consider the following risk factors and the information included under
"Risk Factors" in the accompanying prospectus before you decide to buy our
common shares. You should also carefully read and consider all of the
information we have included, or incorporated by reference, in this prospectus
supplement and the accompanying prospectus before you decide to buy our common
shares.

LOW OIL AND NATURAL GAS PRICES ADVERSELY AFFECT OUR FINANCIAL RESULTS AND
CONDITION.

Prices for oil and natural gas are volatile and declined significantly during
the second half of 1998 and early 1999. Natural gas prices affect us more than
oil prices as natural gas was 79% of our 1998 production and 74% of our
production in the first nine months of 1999. In 1998, natural gas prices we
received were 17% lower than in 1997 and oil prices were 38% lower. Primarily
because of lower prices, we recorded ceiling test write-downs in 1994 and in
1998. If prices declined from current levels, we would be negatively affected in
several ways:

 - our cash flows would be reduced, decreasing funds available for capital
   expenditures to replace reserves or increase production;

 - certain reserves could no longer be economic to produce, which would lead to
   lower reserves and cash flow;

 - our lenders could elect not to extend our credit facility, limiting our
   liquidity and possibly requiring mandatory loan repayments; and

 - access to other sources of capital, such as equity or long-term debt markets,
   could be severely limited or unavailable.

Consequently, our revenues and profitability would suffer. Most of the factors
which affect gas and oil prices are beyond our control, such as demand,
worldwide economic conditions, weather conditions, supply levels, import prices,
political conditions in major oil producing regions, especially the Middle East,
and actions taken by OPEC.

WE MAY INCUR ADDITIONAL WRITE-DOWNS OF THE CARRYING VALUES OF OUR PROPERTIES.

Accounting rules require that we review the carrying value of our oil and
natural gas properties on a periodic basis for possible write-down or
impairment. Under these rules, capitalized costs of proved reserves may not
exceed the value of estimated future net revenues from those proved reserves.
Primarily because of weak oil and natural gas prices, we recorded a
$1.1 million pre-tax ceiling limitation write-down for our U.K. properties in
1998 and we recorded a $9.8 million pre-tax ceiling limitation write-down for
our U.S. properties in 1994. Similarly, the failure to find economic reserves in
Libya and Peru led to a $5.1 million pre-tax impairment of our foreign
investments in Libya in 1998 and a further impairment of $11.4 million in 1999
and an impairment of $5.6 million in Peru in 1994. For a description of the
effect of the differences in ceiling limitation write-downs in the U.S. and
Canada, see Note 11 to the audited consolidated financial statements for the
year ended December 31, 1998 and Note 7 to the unaudited consolidated condensed
financial statements for the period ended September 30, 1999, included elsewhere
in this prospectus supplement.

We may be required to write-down the carrying value of our oil and natural gas
properties in the future if oil and natural gas prices are depressed for even a
short period of time, are unusually volatile or if we have substantial downward
revisions to our proved reserve quantities. Any such ceiling test write-down
would result in a charge to earnings and a reduction of shareholders' equity,
but would not

                                      S-14
<PAGE>
impact our cash flow from operating activities. Once incurred, these write-downs
cannot be reversed at a later date.

Given that full cost accounting rules are applied on a country-by-country basis,
we are currently exposed to the risk of a possible write-down or impairment of
our properties in the U.K. At September 30, 1999, our investment in the U.K.
totaled $7.9 million. Natural gas prices in the U.K. have declined substantially
during the past two years and, barring substantial improvement in U.K. natural
gas prices, we could be required to make a further ceiling limitation write-down
in 1999.

WE RELY ON OUR SENIOR OFFICERS AND OTHER KEY EMPLOYEES.

We rely on key employees and their expertise. If we were to lose several of our
key technical employees or executive officers, our operations could suffer
during their successors' transition periods.

WE AND OUR SUPPLIERS OR PARTNERS MAY NOT BE YEAR 2000 COMPLIANT, WHICH COULD
RESULT IN DISRUPTION OF OUR OPERATIONS.

Actual effects of the Year 2000 issue are subject to uncertainties. Our Year
2000 program may not completely identify every potential problem that may arise.
Our inability to completely solve all potential problems or address all
potentially affected systems could materially hurt our business. Likewise, our
business suppliers and partners may experience unanticipated Year 2000 problems
which could in turn affect our operations. In addition, we have relied on
representations from third parties that our systems and the systems of third
parties with whom we conduct business are Year 2000 compliant. However, because
of the difficulty in anticipating all effects of the Year 2000 issue, these
representations are not guarantees. If there are Year 2000 related failures in
our critical systems or our business suppliers' and partners' critical systems
that create substantial or prolonged disruptions to our business, the adverse
impact on us could materially affect our financial condition or results of
operations. For a description of our Year 2000 program, see "Management's
Discussion and Analysis of Financial Condition and Results of Operations--Year
2000 Disclosure."

INCREASED VOLATILITY OF OIL AND NATURAL GAS PRICES CAN CAUSE SUDDEN CHANGES IN
THE MARKET FOR OUR COMMON SHARES.

Our quarterly results of operations may fluctuate significantly as a result of
variations in oil and natural gas prices and production performance. In recent
years, oil and natural gas price volatility has become increasingly severe. You
can expect the market price of our common shares to decline when our quarterly
results decline or when announcements of adverse events regarding us or the
industry are made. Our common share price may decline to a price below the price
you paid to purchase your common shares in this offering.

                                      S-15
<PAGE>
                                USE OF PROCEEDS

We estimate that the net proceeds from the sale of the common shares will be
approximately $40.4 million, after deducting underwriting discounts and
expenses, or approximately $46.6 million if the underwriters fully exercise
their over-allotment option.

The net proceeds will be used to fund the development of our existing reserves,
to increase our exploration program and may be used to acquire oil and natural
gas properties. Until funds are required for such purposes, the proceeds may be
used to repay bank indebtedness or may be invested in short-term money market
instruments. As of September 30, 1999, our revolving credit facility had an
outstanding balance of $45.0 million and its weighted average interest rate was
6.24%. Our credit facility matures June 29, 2000. If we apply the net proceeds
of this offering to reduce our bank debt, we will have repaid substantially all
of the outstanding balance under our credit facility, resulting in a borrowing
base of approximately $95 million.

                                      S-16
<PAGE>
                                 CAPITALIZATION

The following table sets forth as of September 30, 1999:

 - our historical capitalization; and

 - our capitalization as adjusted to show the receipt of the estimated net
   proceeds from the sale of our common shares being sold in this offering and
   the use of a portion of such proceeds to pay down bank borrowings.

This table should be read in conjunction with the consolidated financial
statements and the related notes thereto included elsewhere in this prospectus
supplement.

<TABLE>
<CAPTION>
                                                              AS OF SEPTEMBER 30, 1999
                                                              ------------------------
                                                                           AS ADJUSTED
                                                                            FOR THIS
                                                              HISTORICAL    OFFERING
                                                              ----------   -----------
                                                               (U.S. $ IN THOUSANDS)
<S>                                                           <C>          <C>
Cash and cash equivalents...................................   $    597     $     997
                                                               ========     =========
Long term debt:
  Bank borrowings...........................................   $ 45,000     $   5,000
                                                               --------     ---------
Shareholders' equity:
  Preferred shares of subsidiary, $1.00 par value,
    10,000,000 shares authorized, 2,726,700
    outstanding(1)..........................................     63,403        63,403
  Common shares, no par value, unlimited shares authorized,
    13,349,059 shares and 15,849,059 shares issued and
    outstanding, respectively, as adjusted for the common
    share offering..........................................    189,010       229,410
  Contributed surplus.......................................         26            26
  Deficit...................................................    (28,650)      (28,650)
                                                               --------     ---------
    Total shareholders' equity..............................    223,789       264,189
                                                               --------     ---------
    Total capitalization....................................   $268,789     $ 269,189
                                                               ========     =========
</TABLE>

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

(1) In 1992, our subsidiary, Chieftain International Funding Corp., sold
    2,726,700 of its $1.8125 cumulative convertible redeemable preferred shares
    at $25.00 per share. The preferred shares are redeemable, at the option of
    the subsidiary, and each preferred share is convertible at any time into
    1.25 shares of our common shares at the option of the holder.

This table does not reflect:

  - up to 375,000 shares that may be sold to the underwriters upon exercise of
    their over-allotment option;

  - 1,123,189 shares that may be issued pursuant to share options outstanding as
    of September 30, 1999; and

  - up to 3,408,375 shares reserved for issuance upon conversion of the $1.8125
    cumulative redeemable preferred shares issued by our subsidiary, Chieftain
    International Funding Corp.

                                      S-17
<PAGE>
                  COMMON SHARE PRICE RANGE AND DIVIDEND POLICY

Our common shares are traded on the American Stock Exchange and The Toronto
Stock Exchange under the symbol "CID." The following table sets forth the range
of high and low sale prices per share of our common shares as reported by the
American Stock Exchange and The Toronto Stock Exchange for the periods
indicated.

<TABLE>
<CAPTION>
                                             AMERICAN STOCK EXCHANGE         THE TORONTO STOCK EXCHANGE
                                         -------------------------------   -------------------------------
                                                                TRADING                           TRADING
                                           HIGH       LOW       VOLUME       HIGH       LOW       VOLUME
                                         --------   --------   ---------   --------   --------   ---------
                                               (U.S.$)                           (CDN.$)
    <S>                                  <C>        <C>        <C>         <C>        <C>        <C>
    1997
      First Quarter....................   $25.88     $18.63    3,286,000    $35.40     $26.00      581,442
      Second Quarter...................    23.13      18.00    2,921,200     32.00      25.00      395,424
      Third Quarter....................    27.37      20.50    2,375,100     37.65      28.35      722,436
      Fourth Quarter...................    28.13      20.13    2,492,900     38.50      29.00      302,748

    1998
      First Quarter....................    24.75      17.94    2,383,200     30.35      25.60      524,607
      Second Quarter...................    24.75      20.25    1,896,700     35.35      30.10      265,873
      Third Quarter....................    23.75      13.94    3,297,200     34.45      21.60    1,158,000
      Fourth Quarter...................    20.25      14.38    2,212,500     30.70      22.75    1,065,825

    1999
      First Quarter....................    15.50       9.56    3,702,800     23.00      14.50      911,056
      Second Quarter...................    18.63      12.25    2,959,100     26.95      19.25      719,569
      Third Quarter....................    22.75      17.44    1,872,300     34.00      25.90      412,641
      Fourth Quarter...................    20.38      17.00    1,234,200     30.25      24.80      163,699
        (through November 10th)
</TABLE>

On November 10, 1999, the last sale price of our common shares was U.S. $17.81
per share as reported by the American Stock Exchange and Cdn. $26.50 per share
as reported by The Toronto Stock Exchange.

We have not paid cash dividends on our common shares in the past. Our current
policy, which is to pay no dividends on our common shares, is subject to
periodic review and may change depending on our earnings, financial condition
and capital requirements. Dividends may be paid on our common shares provided
that all dividends on the preferred shares of Chieftain International Funding
Corp. and on any preferred shares that we may issue have been paid. See
"Description of Share Capital" in the prospectus for more information.

                                      S-18
<PAGE>
                      SELECTED CONSOLIDATED FINANCIAL DATA

The selected consolidated financial data as of and for each of the five years
ended December 31, 1998 has been derived from our audited consolidated financial
statements. The selected consolidated financial data as of and for each of the
nine month periods ended September 30, 1999 and 1998 has been derived from our
unaudited consolidated condensed financial statements. In the opinion of our
management, the selected consolidated financial data as of and for each of the
nine month periods ended September 30, 1999 and 1998 include all normal
recurring adjustments necessary to present this information fairly. Our
financial statements are prepared using Canadian generally accepted accounting
principles. Our reporting currency is U.S. dollars. For a discussion of the
effect of the differences between Canadian and U.S. generally accepted
accounting principles, see Note 11 to the audited consolidated financial
statements and Note 7 to the unaudited consolidated condensed financial
statements which are included elsewhere in this prospectus supplement, and
footnote 2 below. The results of operations for the nine month periods ended
September 30, 1999 should not be regarded as indicative of results for the full
year.

<TABLE>
<CAPTION>
                                        NINE MONTHS
                                           ENDED
                                       SEPTEMBER 30,                          YEAR ENDED DECEMBER 31,
                                   ---------------------     ---------------------------------------------------------
                                     1999        1998           1998          1997       1996        1995       1994
                                   --------   ----------     ----------     --------   ---------   --------   --------
                                        (UNAUDITED)
                                               (U.S. $ IN THOUSANDS, EXCEPT SHARES AND PER SHARE AMOUNTS)
<S>                                <C>        <C>            <C>            <C>        <C>         <C>        <C>
INCOME STATEMENT DATA:
  Revenues:
    Production revenue...........  $ 64,236   $   54,489     $   74,861     $ 84,219   $  72,838   $ 31,733   $ 35,960
      Less: royalties............    11,282        9,637         13,246       14,592      12,226      5,058      5,841
                                   --------   ----------     ----------     --------   ---------   --------   --------
    Production revenue, net of
      royalties..................    52,954       44,852         61,615       69,627      60,612     26,675     30,119
    Interest income and other....       570        2,613 (1)      2,776 (1)    2,428       2,487      4,396      4,757
                                   --------   ----------     ----------     --------   ---------   --------   --------
      Total......................    53,524       47,465         64,391       72,055      63,099     31,071     34,876
  Costs and expenses:
    Production costs.............    10,985       12,219         16,355       13,325      12,220      9,563      8,839
    General and administrative
      expenses...................     3,354        3,668          4,796        4,308       3,972      3,346      3,402
    Interest.....................     1,867          285            437           --          --         --         --
    Depletion and
      amortization(2)............    38,711       30,096         42,081       36,951      30,920     18,779     21,527
    Additional depletion(2)(3)...    11,393           --          6,244           --          --         --     15,434
                                   --------   ----------     ----------     --------   ---------   --------   --------
      Total......................    66,310       46,268         69,913       54,584      47,112     31,688     49,202
                                   --------   ----------     ----------     --------   ---------   --------   --------
  Income (loss) before income
    taxes and dividends on
    preferred shares of a
    subsidiary(4)................   (12,786)       1,197         (5,522)      17,471      15,987       (617)   (14,326)
  Provision (benefit) for income
    taxes
    Current......................         8           27             14            7         124         34         46
    Deferred.....................    (5,416)       1,114         (1,423)       7,304       6,079        124     (4,844)
                                   --------   ----------     ----------     --------   ---------   --------   --------
      Total......................    (5,408)       1,141         (1,409)       7,311       6,203        158     (4,798)
                                   --------   ----------     ----------     --------   ---------   --------   --------
  Income (loss) before dividends
    on preferred shares of a
    subsidiary...................    (7,378)          56         (4,113)      10,160       9,784       (775)    (9,528)
  Dividends on preferred shares
    of a subsidiary(4)...........     3,707        3,707          4,942        4,942       4,942      4,942      4,942
                                   --------   ----------     ----------     --------   ---------   --------   --------
  Income (loss) applicable to
    common shares(2).............  $(11,085)  $   (3,651)    $   (9,055)    $  5,218   $   4,842   $ (5,717)  $(14,470)
                                   ========   ==========     ==========     ========   =========   ========   ========
  Earnings (loss) per common
    share:
    Basic and fully diluted(2)...  $  (0.83)  $    (0.27)    $    (0.67)    $   0.38   $    0.37   $  (0.54)  $  (1.32)
                                   ========   ==========     ==========     ========   =========   ========   ========
  Weighted average number of
    common shares
    outstanding (000's)..........    13,350       13,521         13,480       13,621      13,065     10,633     10,986
                                   ========   ==========     ==========     ========   =========   ========   ========
</TABLE>

                                      S-19
<PAGE>

<TABLE>
<CAPTION>
                                        NINE MONTHS
                                           ENDED
                                       SEPTEMBER 30,                          YEAR ENDED DECEMBER 31,
                                   ---------------------     ---------------------------------------------------------
                                     1999        1998           1998          1997       1996        1995       1994
                                   --------   ----------     ----------     --------   ---------   --------   --------
                                        (UNAUDITED)
                                                                  (U.S. $ IN THOUSANDS)
<S>                                <C>        <C>            <C>            <C>        <C>         <C>        <C>
OTHER FINANCIAL DATA:
  EBITDA(5)......................  $ 39,185   $   31,578     $   43,240     $ 54,422   $  46,907   $ 18,162   $ 22,635
  Cash flow from operations......    33,603       27,559         37,847       49,473      41,841     13,186     17,647
  Net natural gas and oil
    capital expenditures.........    36,187       66,198         92,573       69,453      57,673    100,502     28,059

BALANCE SHEET DATA (AT END OF
  PERIOD):
  Working capital................  $  4,709   $    4,032     $    2,392     $ 22,676   $  42,854   $ 11,216   $103,225
  Total assets(2)................   307,863      300,281        318,584      285,125     267,442    204,555    211,032
  Long-term debt.................    45,000       25,000         40,000           --          --         --         --
  Shareholders' equity(2)........   223,789      240,898        234,946      249,466     244,122    190,534    200,754
</TABLE>

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

(1) Includes a $1.6 million court awarded claim for recovery of past years'
    excess transportation charges.

(2) The use of U.S. generally accepted accounting principles results in the
    following:

<TABLE>
<CAPTION>
                                       NINE MONTHS
                                          ENDED
                                      SEPTEMBER 30,                    YEAR ENDED DECEMBER 31,
                                   -------------------   ----------------------------------------------------
                                     1999       1998       1998       1997       1996       1995       1994
                                   --------   --------   --------   --------   --------   --------   --------
                                       (UNAUDITED)
                                                (U.S. $ IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)
<S>                                <C>        <C>        <C>        <C>        <C>        <C>        <C>
Depletion and amortization.......  $ 25,589   $ 27,465   $ 37,846   $ 33,774   $ 28,539   $ 16,004   $ 17,691
Additional depletion*............    18,497     24,725     95,397         --         --      6,740     18,245
Net income (loss) applicable to
  common shares..................    (6,723)   (18,296)   (63,963)     7,510      6,202     (7,862)   (13,710)
Net income (loss) per common
  share:
  Basic..........................     (0.50)     (1.35)     (4.75)      0.55       0.47      (0.74)     (1.25)
  Fully diluted..................     (0.50)     (1.35)     (4.75)      0.54       0.46      (0.74)     (1.25)
Total assets.....................   232,022    261,500    238,675    269,178    245,763    186,682    195,136
Shareholders' equity.............    98,523    151,533    105,318    174,746    167,110    112,162    124,527
</TABLE>

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

 *  These amounts reflect non-cash write-downs in accordance with full cost
    accounting rules under U.S. generally accepted accounting principles.

(3) These amounts reflect non-cash write-downs of the carrying value of natural
    gas and oil properties in accordance with full cost accounting rules under
    Canadian generally accepted accounting principles. A write-down of U.S.
    property carrying costs, at December 31, 1998, of $16.5 million would have
    been required had December 31, 1998 prices, $2.15 per Mcf and $9.72 per
    barrel, been used. A write-down of U.S. property carrying costs at
    December 31, 1994, of $16.8 million would have been required had
    December 31, 1994 prices, $1.62 per Mcf for natural gas and $16.50 per
    barrel for oil and natural gas liquids, been used.

(4) In 1992, our subsidiary, Chieftain International Funding Corp., sold
    2,726,700 of its $1.8125 cumulative convertible redeemable preferred shares
    at $25.00 per share. The preferred shares are redeemable, at the option of
    the subsidiary, and are convertible at any time into 1.25 common shares of
    Chieftain at the option of the holder.

(5) EBITDA represents income before interest expense, income taxes, depletion
    and amortization (including all amounts for additional depletion) and
    dividends paid on preferred shares of a subsidiary. We have reported EBITDA
    because we believe EBITDA is a measure commonly reported and widely used by
    investors as an indicator of a company's operating performance and ability
    to incur and service debt. We believe EBITDA assists investors in comparing
    a company's performance on a consistent basis without regard to depletion
    and amortization, which can vary significantly depending upon accounting
    methods or nonoperating factors such as historical cost. EBITDA is not a
    calculation based on Canadian or U.S. generally accepted accounting
    principles and should not be considered an alternative to net income in
    measuring our performance or used as an exclusive measure of cash flow
    because it does not consider the impact of working capital growth, capital
    expenditures, debt principal reductions and other sources and uses of cash
    which are disclosed in our Consolidated Statement of Changes in Financial
    Position and Consolidated Condensed Statement of Cash Flows. Investors
    should carefully consider the specific items included in our computation of
    EBITDA. While EBITDA has been disclosed herein to permit a more complete
    comparative analysis of our operating performance and debt servicing ability
    relative to other companies, investors should be cautioned that EBITDA as
    reported by us may not be comparable in all instances to EBITDA as reported
    by other companies. EBITDA amounts may not be fully available for
    management's discretionary use, due to certain requirements to conserve
    funds for capital expenditures, debt service and other commitments.

                                      S-20
<PAGE>
               MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL
                      CONDITION AND RESULTS OF OPERATIONS

You should read the following discussion and analysis in conjunction with our
audited consolidated financial statements and our unaudited consolidated
condensed financial statements included in this prospectus supplement. The
following information contains forward-looking statements. See "Forward-Looking
Statements" in the accompanying prospectus.

We produce and sell natural gas and oil acquired through exploration and
development or through the purchase of producing properties. Our properties are
located offshore in the United States Gulf of Mexico, onshore in Utah and
Louisiana and also in the U.K. sector of the North Sea. The majority of our
attention and resources is focused on the U.S. Gulf of Mexico area where we hold
interests in 143 offshore lease blocks.

Our financial statements and information are reported in U.S. dollars.
Substantially all of our revenues and a significant portion of our operating
expenses are realized or incurred in U.S. dollars.

Our financial statements are prepared based upon Canadian generally accepted
accounting principles. For a discussion of the effect of differences in
generally accepted accounting principles in Canada and the United States on our
financial statements, see Note 11 to our audited consolidated financial
statements and Note 7 to our unaudited consolidated condensed financial
statements which are included elsewhere in this prospectus supplement.

OPERATING RESULTS

    FIRST NINE MONTHS 1999 COMPARED TO FIRST NINE MONTHS 1998

PRODUCTION AND PRICING.  Our average daily combined natural gas and oil
production increased 15% to 93.9 MMcfe (113.7 MMcfe before royalties) for the
first nine months of 1999 from 81.4 MMcfe (98.6 MMcfe before royalties) for the
corresponding period in 1998. Natural gas comprised 74% of our production for
the first nine months of 1999 and 79% of our production for the corresponding
period in 1998. For the first nine months of 1999, our natural gas production
increased 9% to 19.1 Bcf (23.3 Bcf before royalties) compared to 17.5 Bcf (21.4
Bcf before royalties) for the corresponding period in 1998. For the first nine
months of 1999, our oil and natural gas liquids production increased 38% to
1,091 MBbls (1,285 MBbls before royalties) compared to 792 MBbls (912 MBbls
before royalties) for the corresponding period in 1998. Natural gas prices
averaged $1.89 per Mcf for the first nine months of 1999 compared to $2.02 per
Mcf for the corresponding period in 1998. Oil and natural gas liquids prices
averaged $15.62 per barrel for the first nine months of 1999 compared to $12.39
per barrel for the corresponding period in 1998.

PRODUCTION REVENUES.  For the first nine months of 1999, our combined natural
gas and oil production volumes increased 15% from the corresponding period in
1998. A 26% recovery in oil prices was partially offset by a 6% decrease in
natural gas prices. As a result, our production revenues for the first nine
months of 1999 increased 18% ($8.1 million) to $53.0 million from the
corresponding period in 1998.

Eighty-four percent of our natural gas production for the first nine months of
1999 resulted from our interests in 92 wells in the Gulf of Mexico. Our natural
gas production increased 9% in the first nine months of 1999 over the
corresponding period in 1998. This increase in production resulted primarily
from the commencement of production from South Marsh Island 39 at the end of the
first quarter of 1999 and from the commencement of initial natural gas
production from Main Pass 250 B during the latter half of the second quarter of
1999. We expect to add production in the fourth quarter of 1999

                                      S-21
<PAGE>
from a discovery made at South Marsh Island 39 during the third quarter of 1999
and from Main Pass 225 D.

At September 30, 1999, we were producing 68.6 MMcf per day of natural gas (82.9
MMcf per day before royalties), of which 57.9 MMcf per day (72.2 MMcf per day
before royalties) was from the U.S. and 10.7 MMcf per day (before and after
royalties) was from the North Sea. At September 30, 1999, oil production was
4,301 barrels per day (5,089 barrels per day before royalties) of which 1,770
barrels per day (2,027 barrels per day before royalties) was from the Aneth and
Ratherford Units in Utah and 2,493 barrels per day (3,022 barrels per day before
royalties) was from the Gulf of Mexico.

PRODUCTION COSTS.  Our production costs for the first nine months of 1999
decreased 10% from the corresponding period in 1998. This decrease primarily
reflects significant pipeline repair costs in the South Pass area during the
first quarter of 1998 and a succession of weather induced evacuations of manned
facilities in the Gulf of Mexico in the third quarter of 1998. Production costs
on a per unit basis decreased to $0.43 per Mcfe ($0.35 per Mcfe before
royalties), down 22% from the first nine months' average for 1998 of $0.55 per
Mcfe ($0.45 per Mcfe before royalties).

For the first nine months of 1999, production costs were $0.30 per Mcfe ($0.24
per Mcfe before royalties) for Gulf of Mexico area properties, $1.36 per Mcfe
($1.19 per Mcfe before royalties) for the Utah oil producing properties where
secondary and tertiary recovery methods are being used, and $0.08 per Mcfe
(before and after royalties) for the United Kingdom properties.

GENERAL AND ADMINISTRATIVE EXPENSES.  Our general and administrative expenses
for the first nine months of 1999 decreased 9% from the corresponding period in
1998. This decrease reflects higher performance-based compensation payments made
during the first quarter of 1998 than during the corresponding period in 1999.
General and administrative costs for the first nine months of 1999, on a per
unit basis, decreased 21% to $0.13 per Mcfe ($0.11 per Mcfe before royalties)
compared to $0.17 per Mcfe ($0.14 per Mcfe before royalties) for the
corresponding period of 1998.

INTEREST EXPENSE.  Our interest expense for the first nine months of 1999
increased compared to the corresponding period in 1998 due to greater credit
facility utilization. Our weighted average debt outstanding for the nine months
ended September 30, 1999 was $43.3 million compared to $6.1 million for the
corresponding period in 1998. The effective interest rate on our outstanding
debt for the nine months ended September 30, 1999 was 5.76% compared to 6.19%
for the corresponding period in 1998. The weighted average interest rate on our
debt at September 30, 1999 was 6.24%.

DEPLETION AND AMORTIZATION.  Our depletion and amortization expense for the
first nine months of 1999 increased 29% from the corresponding period in 1998 as
a result of a 15% increase in our production and an 11% increase in our average
depletion rate to $1.51 per Mcfe ($1.25 per Mcfe before royalties). The
significant downward revision in our proved reserves at December 31, 1998 that
resulted from the low oil prices on that date is primarily responsible for the
increase in our effective depletion rate in the first nine months of 1999
compared to the corresponding period in 1998.

In Libya, Chieftain and its partners concluded that a multi-year exploration
program and production test is not commercial under the terms of the concession
and will therefore terminate the program. As a result, additional depletion of
$11.4 million was recorded in the second quarter of 1999 to eliminate this
investment, resulting in a charge to operations, net of income taxes, of
$6.3 million.

    1998 COMPARED TO 1997

PRODUCTION AND PRICING.  Our average daily production increased 10% to 85.2
MMcfe (103.2 MMcfe before royalties) in 1998 from 77.8 MMcfe (93.4 MMcfe before
royalties) in 1997. Natural gas comprised 79% of our production in 1998 and 83%
in 1997. In 1998, our natural gas production increased 5% to 24.5 Bcf (30.0 Bcf
before royalties) compared to 23.4 Bcf (28.3 Bcf before royalties) in

                                      S-22
<PAGE>
1997. In 1998, our oil and natural gas liquids production increased 33% to 1,100
MBbls (1,271 MBbls before royalties) compared to 825 MBbls (962 MBbls before
royalties) in 1997. We received an average price of $1.99 per Mcf in 1998
compared to $2.33 per Mcf in 1997 and we received an average price of $11.74 per
barrel in 1998 compared to $18.94 per barrel in 1997.

The combination of economic problems in Asia, the mild North American winter and
aggressive international competition for market share caused crude oil prices to
fall sharply during 1998, bringing the average price that we received for oil
and natural gas liquids to $11.74 per barrel, down 38% from the 1997 average.

The mild North American winter of 1997-98 had a significant downward effect on
natural gas prices. Prices during the fourth quarter of 1998 were down 33% from
the corresponding quarter in 1997. The average price received for our 1998 U.S.
natural gas production declined by 17% to an average of $2.06 per Mcf. In 1998,
natural gas production contributed 79% of our revenue.

PRODUCTION REVENUES.  In 1998, growth in our combined natural gas and oil
production volumes was more than offset by decreases in natural gas and oil
prices. As a result, 1998 production revenues decreased 12% to $61.6 million
($74.9 million before royalties).

Eighty-six percent of our 1998 natural gas production came from our interests in
105 wells in the Gulf of Mexico. Our natural gas production in the Gulf of
Mexico was up 6% in 1998 from 1997, with increases coming from the Main Pass,
Mustang Island, Eugene Island, East Cameron, High Island and Vermilion areas.

Comparing 1998 and 1997, the primary contributors to growth in our production
volumes were the East Cameron and Main Pass areas in the Gulf of Mexico and the
Aneth and Ratherford Units in southeast Utah. During 1998, 64% of our oil
production came from our interests in 269 wells in the Aneth and Ratherford
Units and 26% of our oil production came from the Gulf of Mexico.

At year-end 1998, we were producing 78.2 MMcf per day of natural gas (95.5 MMcf
per day before royalties), of which 67.9 MMcf per day (85.2 MMcf per day before
royalties) was from the U.S. and 10.3 MMcf per day (before and after royalties)
was from the North Sea. Our year-end 1998 oil production was 3,453 barrels per
day (4,030 barrels per day before royalties) of which 1,893 barrels per day
(2,170 barrels per day before royalties) was from the Aneth and Ratherford Units
in Utah and 1,280 barrels per day (1,550 barrels per day before royalties) was
from the Gulf of Mexico. An additional 220 barrels per day (before and after
royalties) was contributed by our interests in two wells in Libya's Sirte Basin.

OTHER REVENUE.  Interest and other revenue received by us in 1998 included a
non-recurring court award of $1.6 million pursuant to a successful claim for
recovery of excess transportation charges incurred from 1990 through 1997.

PRODUCTION COSTS.  Our production costs in 1998 increased 23% from 1997
primarily as a result of several weather-induced evacuations of manned
facilities in the Gulf of Mexico during the third quarter of 1998, the
commencement of production at East Cameron 349 and significant pipeline repair
costs in the South Pass area. Our production costs in 1998 increased to $0.53
per Mcfe ($0.43 per Mcfe before royalties), up 12% from the 1997 rate of $0.47
per Mcfe ($0.39 per Mcfe before royalties). Our higher level of oil production,
compared to our gas production, was also responsible for our higher 1998
production costs. Higher lifting costs are associated with oil production and
oil production comprised 21% of our production volumes in 1998 compared to 17%
in 1997.

GENERAL AND ADMINISTRATIVE EXPENSES.  Our general and administrative expenses
increased 11% for 1998 compared to 1997. This increase reflects
performance-based compensation payments, made during the first quarter, which
were higher in 1998 than in 1997. Our general and administrative costs remained
constant at $0.15 per Mcfe ($0.13 per Mcfe before royalties) in both 1998 and
1997.

                                      S-23
<PAGE>
INTEREST EXPENSE.  Our interest expense in 1998 increased compared to 1997 due
to initial credit facility utilization. Our weighted average debt outstanding
for 1998 was $12.3 million and the effective interest rate on our outstanding
debt for 1998 was 6.19%. The weighted average interest rate on our debt at
December 31, 1998 was 5.65%.

DEPLETION AND AMORTIZATION.  Our depletion and amortization expense in 1998
increased 14% compared to 1997 as a result of a 10% increase in production and a
4% increase in the average depletion rate to $1.35 per Mcfe ($1.12 per Mcfe
before royalties).

    1997 COMPARED TO 1996

PRODUCTION AND PRICING.  Our average daily production increased 8% to 77.8 MMcfe
(93.4 MMcfe before royalties) in 1997 from 71.8 MMcfe (85.8 MMcfe before
royalties) in 1996. Natural gas comprised 83% of our production in 1997 and
1996. In 1997, our natural gas production increased 7% to 23.4 Bcf (28.3 Bcf
before royalties) compared to 21.9 Bcf (26.3 Bcf before royalties) in 1996. In
1997, our oil and natural gas liquids production increased 12% to 825 MBbls (962
MBbls before royalties) compared to 734 MBbls (857 MBbls before royalties) in
1996. The natural gas prices we received in 1997 averaged $2.33 per Mcf compared
to $2.09 per Mcf in 1996. The oil prices we received in 1997 averaged $18.94 per
barrel compared to $20.99 per barrel in 1996.

Exceptionally strong prices for natural gas in North America prevailed during
the winter months at the start of 1997 and also during the period from August to
November of 1997. Natural gas prices weakened at year-end due to warm weather
and higher than normal deliveries from storage which reduced demand for natural
gas.

PRODUCTION REVENUES.  Despite the fall in oil prices in 1997, growth in both our
natural gas and oil production volumes, combined with a rise in natural gas
prices, increased our production revenues 15% ($9 million) to $69.6 million
compared to 1996.

Our natural gas production was up 7% in 1997 over 1996, with increases in
production coming from the Matagorda Island, East Cameron and Main Pass areas.
Eighty-two percent of our 1997 natural gas production came from our interests in
99 natural gas wells in the Gulf of Mexico.

Our production of oil and natural gas liquids increased by 12% in 1997 over
1996. During 1997, 73% of our oil production was from interests in 268 wells in
the Aneth and Ratherford Units and 23% was from the Gulf of Mexico.

At 1997 year-end, we were producing 64.1 MMcf per day of natural gas (76.5 MMcf
per day before royalties). 50.3 MMcf per day (62.7 MMcf per day before
royalties) of this production came from our interests in the U.S. and 13.8 MMcf
per day (before and after royalties) came from our interests in the North Sea.
Our 1997 year-end oil production was 2,779 barrels per day (3,196 barrels per
day before royalties) of which 1,738 barrels per day (2,000 barrels per day
before royalties) was from the Aneth and Ratherford Units in Utah and 650
barrels per day (800 barrels per day before royalties) was from the Gulf of
Mexico.

PRODUCTION COSTS.  Our production costs in 1997 increased 9% from 1996 primarily
as a result of the 8% increase in our production volumes. Our production costs
were $0.47 per Mcfe ($0.39 per Mcfe before royalties), compared to the 1996 rate
of $0.46 per Mcfe ($0.39 per Mcfe before royalties).

GENERAL AND ADMINISTRATIVE EXPENSES.  Our general and administrative expenses
increased 8% in 1997 compared to 1996. Our general and administrative costs were
$0.15 per Mcfe ($0.13 per Mcfe before royalties) in 1997, unchanged from $0.15
per Mcfe ($0.13 per Mcfe before royalties) in 1996.

                                      S-24
<PAGE>
DEPLETION AND AMORTIZATION.  Our depletion and amortization expense in 1997
increased 20% as a result of an 8% increase in our production and an 11%
increase in our average depletion rate to $1.30 per Mcfe ($1.08 per Mcfe before
royalties).

CAPITAL RESOURCES AND LIQUIDITY

Our primary sources of cash are funds generated from our operations and
financing activities. Our primary cash outflows are for exploration and
development activities.

Discretionary cash flow, a frequently used measure of performance for
exploration and production companies, is derived by adjusting net income (loss)
attributable to common shares to eliminate the effects of depletion and
amortization, additional depletion and deferred income taxes. We generated
discretionary cash flow of $33.6 million during the first nine months of 1999
compared to $27.5 million for the corresponding period in 1998. This 22%
increase is primarily a result of our higher operating revenues.

Our financing activities in the first nine months of 1999 provided $4.9 million
of cash, the net result of the drawdown of $5 million of our revolving credit
facility, the exercise of employee stock options and the purchase for
cancellation of 7,500 common shares under our share repurchase program, which
expired on November 1, 1999. Financing activities during the corresponding
period in 1998 provided $20.1 million of cash, which was the net result of:

 - the drawdown of $25 million of our revolving credit facility;

 - the exercise of employee share options for $0.4 million; and

 - the purchase for cancellation of 264,600 common shares at the cost of
   $5.3 million under our share repurchase program.

Cash used in investing activities decreased 38% to $42.2 million for the first
nine months of 1999 from $67.8 million for the corresponding period in 1998. Our
capital expenditures during the first nine months of 1999 totaled
$36.2 million. Of this amount, $1.8 million was expended on development
drilling, $23.0 million on exploratory drilling, $4.7 million on capital field
development and the balance was expended on leasehold, seismic and geological
costs. Of the 15 wells in which we participated in 1999, ten were in the Gulf of
Mexico (four of which were still being drilled at September 30, 1999), three
were onshore in the U.S. and two were in Libya. Five additional wells were
drilled on our Gulf of Mexico acreage at no cost to us, one of which resulted in
a natural gas well and four of which were unsuccessful. We are currently
drilling or plan to drill approximately 15 exploratory and development wells in
the Gulf of Mexico and the Gulf Coast area during the fourth quarter of 1999.

Our September 30, 1999 cash balance of $0.6 million was down $5.5 million from
the balance at September 30, 1998. We had outstanding borrowings of $45 million
on our $100 million revolving credit facility at September 30, 1999. The
weighted average interest rate on our borrowings for the first nine months of
1999 was 5.76%. If we apply the net proceeds of this offering to reduce our bank
debt, we will have repaid substantially all of the outstanding balance under our
revolving credit facility, resulting in a borrowing base of approximately
$95 million.

OUTLOOK

Currently, we have budgeted approximately $18.6 million for exploration and
development capital expenditures for the fourth quarter of 1999. Our preliminary
2000 capital expenditure budget is estimated at $86 million. We expect to fund
most of these expenditures from our operational cash flow. These capital
expenditures can vary significantly as a result of exploration success,
availability of equipment and services and opportunities. We will monitor
capital spending and adjust investment

                                      S-25
<PAGE>
levels based on cash flow projections. We will continue to focus on natural gas
production in the Gulf of Mexico.

YEAR 2000 DISCLOSURE

We have completed our assessment of our internal Year 2000 issues and have made
the changes and employed the testing procedures that we deemed necessary. At
this time, we are confident that no internal issues remain that could have a
material effect on our financial condition or results of operations. We
substantially completed our assessment of the readiness of third parties by the
end of the second quarter of 1999. We continue to monitor the readiness of
significant third parties in order to obtain assurances that interruptions, if
any, will be held to a minimum. We do not consider the costs that we have
incurred to date and which we expect to incur in the future to be material.

We have interests in a substantial number of offshore oil and natural gas
production facilities that are operated by others. We are required to rely on
assessments by others as to Year 2000 readiness of such facilities. Production
volumes are transported through pipelines and processed through facilities that
are also operated by others. Computers are used extensively to control and
operate such pipelines and facilities in the oil and natural gas industry and it
is reasonably likely that one or more of these facilities will experience a
computer related event which could result in the shutdown of production,
transportation or processing facilities for such time as is required to effect
alternative controls. We cannot reasonably quantify the estimated lost revenue,
if any, which would result from such an interruption. To mitigate the effect of
any interruptions, we intend to continue our review of contingency plans
prepared by our various operating partners. See "Risk Factors--We and our
suppliers or partners may not be Year 2000 compliant, which could result in
disruption of our operations."

                                      S-26
<PAGE>
                            BUSINESS AND PROPERTIES

Chieftain is an independent energy company engaged in the exploration,
development and production of natural gas and oil. Our producing properties and
exploration acreage are primarily located in the shallow waters of the U.S. Gulf
of Mexico. We also have properties located onshore in Louisiana, in the Four
Corners area of southeast Utah and in the U.K. sector of the North Sea. We were
incorporated under the Business Corporations Act (Alberta) in 1988 and commenced
operations upon the closing of our initial public offering on April 20, 1989.

We have assembled a large natural gas and oil lease acreage position in the Gulf
of Mexico. Our lease interests in the Gulf of Mexico include a balanced
portfolio of exploration and development drilling prospects. These prospects
range from high-impact prospects with relatively greater risks, which we believe
have the potential to add substantially to our reserves, to relatively lower
risk development and exploitation projects with lower reserve potential. Our
exploration efforts are supported by an extensive 3-D seismic database covering
most of our leases. We believe that our seismic database and related
technological expertise have contributed to our successful exploration and
development track record. We believe our conservative capital structure provides
us with the financial flexibility to take advantage of our prospects and other
opportunities, including acquisitions of leasehold acreage and producing
properties.

We hold interests in 133 lease blocks located on the continental shelf of the
Gulf of Mexico. We also have interests in ten deep-water blocks. Of these lease
blocks, 94 are held as exploratory acreage and 49 are held by production. We
operate 38 of these blocks. Our average working interest in our Gulf of Mexico
leases is approximately 40%. In the third quarter of 1999, we had net production
of 75.9 MMcfe per day in the Gulf of Mexico, which represented approximately 77%
of our total production.

In addition to our Gulf of Mexico properties, we own various interests in two
large light oil producing units in the Four Corners area of southeast Utah where
we had net production of 1,774 barrels per day in the third quarter of 1999. We
own an interest in approximately 9,600 net acres in the U.K. sector of the North
Sea where we had net production of 10.5 MMcfe per day in the third quarter of
1999. We are also active in exploratory activities onshore in Louisiana.

At December 31, 1998, we had estimated proved reserves of 207.9 Bcfe. These
reserves had a present value of net cash flows before income taxes, discounted
at 10%, of $152.5 million using constant natural gas and oil prices in effect on
December 31, 1998, which averaged $2.12 per Mcf for natural gas and $9.72 per
barrel for oil. If our realized natural gas and oil prices in effect at
September 30, 1999 were used in this determination, assuming no other changes,
our estimated proved reserves at December 31, 1998, would have increased to
222.7 Bcfe and the present value of net cash flows before income taxes,
discounted at 10%, would have increased to $279.0 million. Our average realized
prices for our production at September 30, 1999 were $2.58 per Mcf for natural
gas and $20.16 per barrel for oil. At December 31, 1998, approximately 62% of
our proved reserves were natural gas and approximately 70% of our proved
reserves were developed. Our total proved reserves at December 31, 1998 had a
reserves-to-production ratio of approximately 6.8 years.

We have experienced substantial growth in proved reserves, production, revenue
and cash flow as demonstrated by the following:

 - Since 1994, our overall drilling success rate has been 74% and our drilling
   success rate for exploratory wells has been 40%. For the nine months ended
   September 30, 1999, our overall drilling success rate was 73% and our
   drilling success rate for exploratory wells was 62%.

                                      S-27
<PAGE>
 - Since 1994, we have added proved reserves of 235 Bcfe, of which 127 Bcfe has
   been from drilling, 72 Bcfe has been from acquisitions and 36 Bcfe has been
   from upward revisions of previous estimates.

 - Since 1994, we have replaced 208% of our production.

 - We have increased our average daily production 157% to 98.3 MMcfe per day in
   the third quarter of 1999 from 38.2 MMcfe per day in 1994.

 - We have increased our net production revenues 18% to $53.0 million for the
   first nine months of 1999 from $44.9 million for the first nine months of
   1998.

 - We have increased our EBITDA 24% to $39.2 million for the first nine months
   of 1999 from $31.6 million for the first nine months of 1998.

OUR STRENGTHS

We believe that our historical success and future performance are directly
related to the following combination of strengths:

 - SUBSTANTIAL INVENTORY OF DRILLING PROJECTS IN THE GULF OF MEXICO.  In the
   Gulf of Mexico, we have generated an inventory of over 45 drilling locations,
   of which 36 are exploratory. Substantially all of these locations have been
   evaluated and defined using 3-D seismic data. Our large inventory permits us
   to be flexible in project selection and in the timing of drilling. By
   identifying new exploration targets and acquiring additional acreage, we
   continually add to our drilling inventory.

 - PROVEN EXPLORATORY EXPERTISE.  Our ability to define and participate in
   successful exploratory prospects in the Gulf of Mexico is demonstrated by our
   exploratory drilling success rate in the Gulf of Mexico of 88% over the nine
   months ended September 30, 1999.

 - EXPERIENCED TECHNICAL TEAM.  Our technical team is comprised of highly
   respected industry professionals with an average of 22 years of industry
   experience. We believe our exploration success is a direct result of this
   team's engineering and technical analyses.

 - FINANCIAL FLEXIBILITY.  With the net proceeds of this offering, we will have
   the ability to repay substantially all of our outstanding indebtedness,
   resulting in approximately $95 million of availability under our revolving
   credit facility. We seek to maintain low levels of debt in order to respond
   quickly to drilling or acquisition opportunities.

BUSINESS STRATEGY

Our strategy is to increase our reserves, production, revenue and cash flow
through exploration and development drilling and through the acquisition of
leasehold acreage and producing properties. The elements of our strategy include
the following:

 - FOCUS ON THE GULF OF MEXICO.  We focus our operations on the Gulf of Mexico
   where we have acquired a significant exploration acreage position and
   assembled a substantial 3-D seismic database. We believe this region combines
   significant geological potential, reservoir size, quality and deliverability
   with favorable commodity pricing and attractive finding, development and
   operating costs.

 - GROW THROUGH EXPLORATION.  We are pursuing an active technology-driven
   exploration program that is designed to balance projects with lower risk and
   moderate potential with drilling prospects which have higher risk and
   substantial potential. We generate exploration prospects through geological
   and geophysical analysis of 3-D seismic and other data and also review
   prospects generated by others. Currently, we have budgeted approximately
   $18.6 million for exploration and

                                      S-28
<PAGE>
   development capital expenditures for the fourth quarter of 1999 and we expect
   to use $14.9 million of this amount for exploration activities. We are
   currently drilling or plan to drill approximately 15 exploratory and
   development wells in the Gulf of Mexico and in the Gulf Coast area during the
   fourth quarter of 1999. We have budgeted approximately $86.2 million for
   exploration and development capital expenditures for 2000, $50.0 million of
   which we expect to use for exploration activities.

 - MANAGE DRILLING RISKS THROUGH JOINT VENTURES AND THE USE OF ADVANCED
   TECHNOLOGIES.  We seek to limit our financial and operating risks in selected
   projects by participating in drilling with industry partners and operators.
   We believe this strategy limits our risk exposure in high potential
   prospects. Additionally, we have increasingly relied on advanced
   technologies, including 3-D seismic analysis, to define geologic risks,
   thereby enhancing the results of our drilling efforts. We also seek to
   operate our projects in order to better control drilling costs and the timing
   of drilling.

 - EVALUATE AND PURSUE STRATEGIC ACQUISITIONS.  We continually review
   opportunities to acquire leasehold acreage and producing properties. We seek
   to acquire properties that we believe have significant exploration potential
   and to increase our working interest in producing lease blocks when available
   to us on economically favorable terms.

PROPERTIES

Our principal natural gas and oil properties are concentrated in the U.S. Gulf
of Mexico and, to a lesser extent, onshore Louisiana, Utah and other parts of
the U.S. and in the U.K. sector of the North Sea.

The following table summarizes our estimated proved reserves by major operating
area and the estimated present value of net cash flows before income taxes,
discounted at 10%, of these reserves at December 31, 1998:

<TABLE>
<CAPTION>
                                                   PROVED RESERVES
                                            ------------------------------   ESTIMATED PRESENT
                                                       OIL AND                 VALUE BEFORE
                                                       NATURAL                INCOME TAXES OF
                                            NATURAL      GAS                  PROVED RESERVES
                                              GAS      LIQUIDS     TOTAL         (U.S.$ IN
                                             (MMCF)    (MBBLS)    (MMCFE)       THOUSANDS)
                                            --------   --------   --------   -----------------
<S>                                         <C>        <C>        <C>        <C>
Gulf of Mexico............................   96,774      3,865    119,965    $         121,090
Onshore Louisiana.........................   20,672         79     21,145               19,422
Utah and Other Onshore....................    1,517      9,163     56,496                2,991
                                            -------     ------    -------    -----------------
    Total U.S.............................  118,963     13,107    197,606              143,503
U.K. (North Sea)..........................   10,110         27     10,271                9,005
                                            -------     ------    -------    -----------------
    Total(1)..............................  129,073     13,134    207,877    $         152,508
                                            =======     ======    =======    =================
</TABLE>

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

(1) If our realized prices in effect at September 30, 1999 were used in this
    determination, assuming no other changes, proved reserves would have
    increased to 222.7 Bcfe and PV-10 Value would have increased to
    $279.0 million.

 GULF OF MEXICO

We concentrate our exploration and development activities in, and devote
substantial managerial and financial resources to, the offshore U.S. Gulf of
Mexico. The Gulf of Mexico contains a prolific oil and natural gas basin. This
area is more than 600 miles long and 100 miles wide and extends from the State
of Texas to the State of Florida. We primarily focus our exploration and
development activities in the

                                      S-29
<PAGE>
shallow waters (less than 600 feet deep) of the Gulf of Mexico continental
shelf. The continental shelf is a low cost operating environment for which
technical and analytical data, including 3-D seismic data, are readily
available. The vast network of gathering systems and pipelines in the shallow
waters of the basin provides excellent access to markets. The Gulf of Mexico's
geology is generally characterized by multiple productive horizons and good
permeability which is conducive to high initial production and relatively rapid
capital payback.

We maintain a large acreage position in the Gulf of Mexico. With an average
interest of 40% in 143 blocks, we rank as the sixteenth largest leaseholder and
the ninth largest independent producer on the continental shelf. Of these lease
blocks, 133 are shallow water blocks and ten are deep-water blocks. We acquired
three blocks covering 15,000 acres at the March 1999 Central Gulf of Mexico
lease sale. We participated in high bids for three blocks, covering
approximately 17,000 acres, at the Western Gulf of Mexico lease sale in late
August 1999. Our acreage in the Gulf of Mexico covered 684,495 gross (268,386
net) acres at September 30, 1999. We operate 38 blocks in the Gulf of Mexico.

Described below are the areas of our current exploration and development
activity in the Gulf of Mexico. Of these properties, we operate High Island
Blocks A-510, A-530 and A-531 and West Cameron Blocks 300 and 386.

HIGH ISLAND.  In August 1999, we announced that our exploratory well on High
Island Blocks A-510/A-531, located offshore Texas, resulted in an oil and
natural gas discovery. This well was drilled to a total depth of 11,107 feet and
encountered more than 260 net feet of hydrocarbon-bearing pay in multiple zones.
We are now drilling an additional well on Block A-510 and will then design and
install production facilities. We operate, and have a 50% working interest in,
this project.

VERMILION 267.  We have a 60% working interest in the Vermilion 267 No. 1
natural gas discovery well located offshore Louisiana. This well reached a total
depth of 13,370 feet in early October 1999 and encountered 52 feet of high
quality net effective hydrocarbon-bearing reservoir rock. This well has been
cased for production and the design of production facilities is in progress.
Additional exploratory and development drilling is planned to fully develop the
block.

SOUTH MARSH ISLAND.  In March 1999, we commenced production of oil and natural
gas from two wells on South Marsh Island Block 39 in which we have a 50% working
interest. We commenced additional production in the third quarter of 1999 from
two successful exploratory wells drilled into separate fault blocks during the
first quarter of 1999. In the third quarter of 1999, we drilled a successful
well to test geological zones below then-productive formations which commenced
production in late August 1999. A total of six successful wells have been
drilled on the block. Our share of production from this block averaged 7.6 MMcf
per day of natural gas and 1,500 barrels per day of light oil in the third
quarter of 1999 and was the principal contributor to our increased production
during this period.

MAIN PASS.  Our share of natural gas and natural gas liquids production from
Main Pass averaged 14.0 MMcfe per day during the third quarter of 1999. We are
continuing drilling and development activity on this property. Production from a
new platform is scheduled to commence in the fourth quarter of 1999.

EUGENE ISLAND.  Design of production facilities is under way for Eugene Island
Block 189 where two successful oil and natural gas discoveries were drilled on
separate fault blocks in 1997. A third well is planned after the production
platform has been installed. New production is anticipated in early 2000.

OTHER OFFSHORE AREAS.  At South Timbalier Block 196, production from a 1999
first-quarter multiple zone oil and natural gas discovery, in which we have a
50% working interest, is expected to commence in early 2000.

                                      S-30
<PAGE>
Exploratory drilling is under way, or is planned to commence prior to the
1999 year-end, on High Island Block A-530, in which we have a 75% interest, West
Cameron Block 300, in which we have a 35% interest, West Cameron Block 386, in
which we have an 80% interest, Grand Isle Block 103, in which we have a 20%
interest, West Cameron Block 613, in which we have a 25% interest, Matagorda
Island Block 704, in which we have a 25% interest, and High Island Block A-510,
in which we have a 50% interest.

 ONSHORE LOUISIANA

Currently, we are actively exploring three onshore prospects in Louisiana. These
prospects are described below.

VERMILION PARISH--NORTHEAST WRIGHT FIELD.  In the second quarter of 1999,
drilling commenced to follow up a 1998 discovery well, D.W. Guidry No. 1. The
Guidry well discovered 150-feet of net natural gas pay below 17,000 feet. Our
interest in this well is subject to a recovery penalty on a portion of well
costs. The follow-up well, Broussard No. 1, was drilled as a delineation well to
confirm and extend natural gas reserves discovered in the Guidry well. The
Broussard No. 1 well was drilled to a measured depth of 18,340 feet in early
October 1999 and production liner has been run to total depth. This well
encountered a significant accumulation of natural gas-bearing high quality
reservoir rock. Completion procedures are in progress and we expect production
from the Broussard No. 1 well to commence during the fourth quarter of 1999.
Production facilities and flow lines in the field are being expanded to
accommodate increased production volumes and additional drilling is planned to
fully develop the field. We own a 50% interest in the Broussard No. 1 well and
approximately 3,100 acres in the Northeast Wright Field.

LAFOURCHE PARISH--NORTHEAST CHACAHOULA PROSPECT.  We are participating, with a
50% interest, in a 17,280-foot exploratory well, Levert No. 1, on the 850-acre
Northeast Chacahoula Prospect, which is prospective for both natural gas and
oil.

IBERIA PARISH--BAYOU PIGEON PROSPECT.  In September 1999, we commenced drilling
of a 15,500-foot exploratory well, Williams Land Co. No. 1. We have a 50%
interest in the 1,973-acre Bayou Pigeon Prospect.

 UTAH AND OTHER ONSHORE

In the Four Corners area of Utah, we have a 13.4% interest in the Aneth Unit and
a 21.4% interest in the Ratherford Unit, both of which produce light oil. During
1998, we drilled 30 multi-lateral horizontal development wells in these fields.
We currently have a carbon dioxide tertiary recovery pilot project at the Aneth
Unit and we are planning a field-wide tertiary recovery project at the
Ratherford Unit. Due to higher operating costs, economic recovery of the
reserves in these units is more sensitive to low oil prices than our other
properties. For the nine months ended September 30, 1999, our share of
production from these fields averaged 1,794 barrels per day. In addition, we
also have onshore interests in Montana, North Dakota, Pennsylvania and Texas.
Production from these interests during the nine months ended September 30, 1999
was minimal.

 UNITED KINGDOM (NORTH SEA)

In the North Sea, we produce natural gas from two fields in the southern basin
of the U.K. sector in which we have a 17% average interest. Our production
averaged 9.7 MMcf per day in the nine months ended September 30, 1999 and
amounted to 14% of our total natural gas production and 7% of our total natural
gas revenue for this period. We plan to participate in a 3-D seismic program on
a portion of our North Sea acreage.

                                      S-31
<PAGE>
RESERVES

The following table sets forth certain summary information with respect to
estimates of our oil and natural gas reserves for the periods indicated.
Estimates of our U.S. oil and natural gas reserves, the future net revenues
therefrom and their discounted present value at a rate of 10%, or PV-10 Value,
have been prepared by Netherland, Sewell & Associates, Inc., independent
petroleum engineers. Estimates of our U.K. reserves and related information have
been prepared by our personnel. U.K. reserves comprise 5% of our total reserves
on a Bcfe basis.

<TABLE>
<CAPTION>
                                                                                 AS AT DECEMBER 31,
                                                         -------------------------------------------------------------------
                                                            1998            1997          1996          1995          1994
                                                         -----------      --------      --------      --------      --------
    <S>                                                  <C>              <C>           <C>           <C>           <C>
    ESTIMATED PROVED OIL AND NATURAL GAS RESERVES:
      Natural gas reserves--before royalties (MMcf):
        Proved developed...............................      122,164       105,990       102,017        99,709        40,624
        Proved undeveloped.............................       36,900        43,453        48,597        50,225        26,107
                                                         -----------      --------      --------      --------      --------
          Total........................................      159,064       149,443       150,614       149,934        66,731
                                                         ===========      ========      ========      ========      ========
      Natural gas reserves--net of royalties (MMcf):
        Proved developed...............................       99,432        89,139        86,997        85,705        33,581
        Proved undeveloped.............................       29,641        35,958        39,804        40,986        25,155
                                                         -----------      --------      --------      --------      --------
          Total........................................      129,073       125,097       126,801       126,691        58,736
                                                         ===========      ========      ========      ========      ========
      Oil reserves--before royalties (MBbls):
        Proved developed...............................        8,786         9,591         9,482         8,501         6,317
        Proved undeveloped.............................        6,441         3,415         1,087         1,101           956
                                                         -----------      --------      --------      --------      --------
          Total........................................       15,227        13,006        10,569         9,602         7,273
                                                         ===========      ========      ========      ========      ========
      Oil reserves--net of royalties (MBbls):
        Proved developed...............................        7,534         8,397         8,397         7,509         5,588
        Proved undeveloped.............................        5,600         2,916           907           943           797
                                                         -----------      --------      --------      --------      --------
          Total........................................       13,134        11,313         9,304         8,452         6,385
                                                         ===========      ========      ========      ========      ========
        Total proved oil and natural gas
          reserves--before royalties (MMcfe)(1)........      250,426       227,479       214,028       207,546       110,370
                                                         ===========      ========      ========      ========      ========
        Total proved oil and natural gas reserves--net
          of royalties (MMcfe)(1)......................      207,877       192,975       182,625       177,403        97,046
                                                         ===========      ========      ========      ========      ========
    ESTIMATED PRESENT VALUE OF PROVED RESERVES (U.S. $
      IN THOUSANDS):
        Proved developed...............................  $   135,867      $187,697      $218,961      $111,608      $ 43,595
        Proved undeveloped.............................       16,641        50,615        85,335        40,096        19,333
                                                         -----------      --------      --------      --------      --------
        Total PV-10 Value (before income taxes)........  $   152,508(2)   $238,312      $304,296      $151,704      $ 62,928
                                                         ===========      ========      ========      ========      ========
        Standardized measure of discounted estimated
          future net cash flows after income
          taxes(3).....................................  $   152,508      $199,573      $239,023      $137,494      $ 60,374
                                                         ===========      ========      ========      ========      ========
    PRICES USED IN CALCULATING END OF YEAR PROVED
      RESERVES:
      U.S. natural gas reserves (per Mcf)..............  $      2.15      $   2.74      $   3.43      $   2.06      $   1.62
      U.K. natural gas reserves (per Mcf)..............         1.74          1.76          2.04          0.86          2.25
      Oil (per barrel).................................         9.72         16.69         24.03         18.48         16.50
</TABLE>

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

(1) Oil is converted into natural gas equivalents using a conversion ratio of 6
    Mcf of natural gas to 1 barrel of oil.

(2) If our realized prices in effect at September 30, 1999 were used in this
    determination, proved reserves would have increased to 222.7 Bcfe and their
    PV-10 Value would have increased to $279.0 million.

(3) At December 31, 1998, no income taxes would be payable at these natural gas
    and oil price levels.

                                      S-32
<PAGE>
ACREAGE

The following table summarizes our acreage held as at September 30, 1999. Where
applicable, interests that are not working interests (none of which is material)
have been converted to working interest equivalents.

<TABLE>
<CAPTION>
                                                              GROSS ACRES   NET ACRES
                                                              -----------   ---------
<S>                                                           <C>           <C>
United States
  Offshore Gulf of Mexico
    Louisiana...............................................      315,414     110,119
    Texas...................................................      369,081     158,267
                                                              -----------   ---------
      Total Offshore Gulf of Mexico.........................      684,495     268,386
                                                              -----------   ---------

  Onshore
    Louisiana...............................................        6,478       3,025
    Montana.................................................        3,240       3,240
    North Dakota............................................        2,277         415
    Pennsylvania............................................          324          36
    Utah....................................................       30,980       5,626
                                                              -----------   ---------
      Total Onshore.........................................       43,299      12,342
                                                              -----------   ---------

Total United States.........................................      727,794     280,728
                                                              -----------   ---------

United Kingdom
  North Sea.................................................       60,273       9,644
                                                              -----------   ---------

      Total, all areas......................................      788,067     290,372
                                                              ===========   =========
</TABLE>

DRILLING ACTIVITY

During the nine months ended September 30, 1999, we participated in drilling
nine wells in the Gulf of Mexico area, of which eight were successful for an 89%
success rate. We accelerated our drilling activity in the Gulf of Mexico region
during the third quarter in response to higher natural gas and oil prices. We
are currently drilling or plan to drill approximately 15 exploratory and
development wells in the Gulf of Mexico and the Gulf Coast area during the
fourth quarter of 1999.

The following table summarizes the results of our drilling activities during
each of the three years ended December 31, 1998 and the nine months ended
September 30, 1999.

<TABLE>
<CAPTION>
                                                        GROSS WELLS                         NET WELLS
                                             ---------------------------------   --------------------------------
       PERIOD             TYPE OF WELL          DRY      SUCCESSFUL    TOTAL       DRY      SUCCESSFUL    TOTAL
- --------------------  --------------------   ---------   ----------   --------   --------   ----------   --------
<S>                   <C>                    <C>         <C>          <C>        <C>        <C>          <C>
Nine months ended     Exploratory.........      3          5            8         0.45         2.50        2.95
  September 30, 1999  Development.........      --         3            3          --          1.04        1.04

Year ended            Exploratory.........      8          7           15         3.45         2.24        5.69
  December 31, 1998   Development.........      --         35          35          --          6.58        6.58

Year ended            Exploratory.........      9          8           17         2.99         3.32        6.31
  December 31, 1997   Development.........      1          43          44         0.50         7.92        8.42

Year ended            Exploratory.........      8          7           15         2.26         1.72        3.98
  December 31, 1996   Development.........      2          28          30         0.67         5.00        5.67
</TABLE>

                                      S-33
<PAGE>
WELLS

Our productive natural gas and oil wells as at December 31, 1996, 1997 and 1998
and as at September 30, 1999 are listed in the following table.

<TABLE>
<CAPTION>
                                                               NATURAL
                                                              GAS WELLS   OIL WELLS   TOTAL WELLS
                                                              ---------   ---------   -----------
<S>                                                           <C>         <C>         <C>
September 30, 1999
  Gross.....................................................    100         290         390
  Net.......................................................   20.85       51.29       72.14
December 31, 1998
  Gross.....................................................    100         287         387
  Net.......................................................   20.44       49.86       70.30
December 31, 1997
  Gross.....................................................    118         287         405
  Net.......................................................   29.06       49.66       78.72
December 31, 1996
  Gross.....................................................    93          295         388
  Net.......................................................   21.28       50.79       72.07
</TABLE>

PRODUCTION

The commencement of production from South Marsh Island Block 39 and new
production from Main Pass Block 250 were the principal contributors to our
increased production in the first nine months of 1999. During the third quarter
of 1999, we increased our production of oil and natural gas liquids by 56% from
the third quarter of 1998 to a record level of 4,394 barrels per day. The
average price that we received for oil and natural gas liquids in the third
quarter of 1999 was $19.31 per barrel, an increase of 63% from the third quarter
of 1998. Our natural gas production increased by 21% from the third quarter of
1998 to 72 MMcf per day. The average price that we received for U.S. natural gas
production in the third quarter was $2.46 per Mcf, an increase of 25% from the
third quarter of 1998. The average price that we received for North Sea natural
gas production was $0.81 per Mcf, a decrease of 32% from the third quarter of
1998.

The following table summarizes our production volume and weighted average sales
prices for the periods indicated.

<TABLE>
<CAPTION>
                                                        NINE MONTHS
                                                           ENDED
                                                       SEPTEMBER 30,                    YEAR ENDED DECEMBER 31,
                                                    -------------------   ----------------------------------------------------
                                                      1999       1998       1998       1997       1996       1995       1994
                                                    --------   --------   --------   --------   --------   --------   --------
<S>                                                 <C>        <C>        <C>        <C>        <C>        <C>        <C>
NET SALES VOLUME:
  Natural gas--before royalties (MMcf)............   23,327     21,433     30,048     28,316     26,277     12,954     12,604
  Oil and natural gas liquids--before
    royalties (MBbls).............................    1,285        912      1,271        962        857        693        691
  Total production--before royalties
    (MMcfe)(1)....................................   31,035     26,906     37,674     34,088     31,416     17,111     16,753
  Natural gas--net of royalties (MMcf)............   19,098     17,470     24,504     23,431     21,894     10,754     10,382
  Oil and natural gas liquids--net of
    royalties (MBbls).............................    1,091        792      1,100        825        734        600        595
  Total production--net of royalties
    (MMcfe)(2)....................................   25,642     22,223     31,102     28,383     26,296     14,351     13,953

WEIGHTED AVERAGE SALES PRICES:
  Natural gas (per Mcf)...........................  $  1.89    $  2.02    $  1.99    $  2.33    $  2.09    $  1.54    $  1.97
  Oil and natural gas liquids (per barrel)........    15.62      12.39      11.74      18.94      20.99      16.94      15.86
</TABLE>

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

(1) Oil is converted into natural gas equivalents using a conversion ratio of
    6 Mcf of natural gas to 1 barrel of oil.

                                      S-34
<PAGE>
MARKETING

Most of our natural gas reserves are located in the U.S. Gulf of Mexico area
where ready deliverability of natural gas through numerous large capacity
pipelines and auxiliary feeder pipelines provides flexibility in marketing our
natural gas production in the U.S. spot market. Natural gas prices in the U.S.
and in the British North Sea are largely determined by competitive market
forces.

Most of the natural gas we have produced has been marketed since 1989 by
Highland Energy Company, an aggregator for several U.S. natural gas producers,
at prices based on spot market prices. Highland Energy Company also assists us
in arranging for the marketing of our U.K. natural gas production.

We have sold our oil production from the Aneth and Ratherford Units in the Four
Corners area of Utah under successive term contracts to a regional refiner since
1989. Due to the quantity and quality of this oil, we have obtained premiums
over locally posted prices for this production. Most of our Gulf of Mexico oil
and natural gas liquids production is marketed by Highland Energy Company.

We believe that alternative marketing arrangements would be readily available
for our natural gas, oil and natural gas liquids production although any
alternative arrangement could be less advantageous to us.

PRICE RISK MANAGEMENT

Market prices of oil and natural gas fluctuate and can adversely affect our
operating results. To mitigate some of this risk, from time to time, we may
enter into forward contracts for a portion of our production so as to lock in a
firm natural gas price for a specific volume and delivery period. We sell most
of our gas under short term contractual arrangements and do not engage in
speculative forward selling of volumes that cannot be physically delivered.

LITIGATION

We are, in the ordinary course of business, party to various legal proceedings.
In the opinion of our management, none of these proceedings, either individually
or in the aggregate, is material.

EMPLOYEES

At September 30, 1999, we employed 40 persons. None of our employees is
represented by a union. We consider relations with our employees to be
excellent.

                                      S-35
<PAGE>
                                   MANAGEMENT

DIRECTORS AND EXECUTIVE OFFICERS

Our directors and executive officers and their ages as of the date of this
prospectus supplement are as follows:

<TABLE>
<CAPTION>
NAME                                     AGE                        POSITION
- ----                                   --------                     --------
<S>                                    <C>             <C>
David E. Mitchell, O.C. .............     73           Director and Chairman of the Board
                                                       of Directors

Stanley A. Milner....................     70           Director, President and Chief
                                                       Executive Officer

Stephen C. Hurley....................     49           Director, Senior Vice President and
                                                       Chief Operating Officer

Edward L. Hahn.......................     62           Senior Vice President, Finance and
                                                       Treasurer

Esther S. Ondrack....................     59           Director, Senior Vice President and
                                                       Secretary

James B. Lewis.......................     49           Senior Vice President, Operations

S. Jay Milner........................     41           Vice President, Drilling and
                                                       Production

Ronald J. Stefure....................     52           Vice President and Controller

Hugh J. Kelly........................     74           Director

John E. Maybin.......................     74           Director

Louis G. Munin.......................     65           Director

Stuart T. Peeler.....................     70           Director
</TABLE>

Our Board of Directors consists of eight members. Each member of the Board is
elected for a term of three years and their terms are staggered. At our last
annual meeting of shareholders, held in May 1999, Messrs. Kelly, Munin and
Peeler were re-elected to serve until 2002. The terms of Messrs. Hurley and
Maybin and of Mrs. Ondrack expire in 2000. The terms of Messrs. Milner and
Mitchell expire in 2001. All of our Directors are also Directors of our
subsidiary, Chieftain International Funding Corp.

DAVID E. MITCHELL, O.C., who is Chairman Emeritus of Alberta Energy
Company Ltd., has been Chairman of the Board of Directors of Chieftain since
February 1989. A graduate in engineering of the University of Oklahoma, he was
President and Chief Executive Officer and a director of Alberta Energy from 1974
until 1993 and chairman of its Board of Directors from 1993 to 1999.
Mr. Mitchell is also a former director of Air Canada, The Bank of Nova Scotia,
Hudson's Bay Company, Lafarge Corporation, Noranda Mines Ltd. and Pan-Alberta
Gas Ltd. He has been awarded the Order of Canada and he is a former president of
the Independent Petroleum Association of Canada. Mr. Mitchell is Stanley A.
Milner's first cousin.

STANLEY A. MILNER has been President and Chief Executive Officer and a Director
of Chieftain since Chieftain's incorporation in 1988. Mr. Milner served in the
same capacities with Chieftain Development Co. Ltd., which he founded in
June 1964. A graduate of the University of Alberta and a member of the

                                      S-36
<PAGE>
Engineering Institute of Canada, he is chairman of the Board of Directors of
Alberta Energy Company Ltd. and a former director of Canadian Imperial Bank of
Commerce and Canadian Pacific Limited. He is a former president of the
Independent Petroleum Association of Canada, a former alderman of the City of
Edmonton and a former chairman of the Board of Governors of the University of
Alberta. Mr. Milner is S. J. Milner's father and David E. Mitchell's first
cousin.

STEPHEN C. HURLEY has been Senior Vice President, Chief Operating Officer and a
Director of Chieftain since 1997. He joined Chieftain in 1995 as Senior Vice
President, Exploration and Chief Operating Officer. From 1991 to 1995, he was
employed by Murphy Exploration and Production Company as Vice President,
Exploration and Production responsible for worldwide exploration. Mr. Hurley was
employed by Ocean Drilling & Exploration Company, a subsidiary of Murphy
Exploration and Production, as Vice President, Exploration from 1987 to 1991,
General Manager, Exploration from 1984 to 1987 and Senior Geologist from 1980 to
1984. From 1975 to 1980 he was employed by Exxon Company USA. Mr. Hurley
graduated in 1975 from the University of Arkansas with a Master of Science
degree in geology. He is a member of the American Association of Petroleum
Geologists, the New Orleans Geological Society, the Society of Exploration
Geophysicists and the American Petroleum Institute.

EDWARD L. HAHN has been Senior Vice President, Finance and Treasurer of
Chieftain since 1995. From the time of Chieftain's incorporation in 1988 to
1995, he was Vice President, Finance and Treasurer. Prior to 1988, Mr. Hahn was
Senior Vice President, Finance and Treasurer of Chieftain Development Co. Ltd. A
chartered accountant, Mr. Hahn joined Chieftain Development as Controller in
1976 with 15 years experience in public accounting and seven years of experience
in oil field manufacturing.

ESTHER S. ONDRACK has been Senior Vice President, Secretary and a Director of
Chieftain since 1995. From the time of Chieftain's incorporation in 1988 to
1995, she was Vice President, Secretary and a Director. Prior to 1988,
Mrs. Ondrack was Senior Vice President, Administration, Corporate Secretary and
a director of Chieftain Development Co. Ltd. A graduate of the University of
Alberta, Mrs. Ondrack joined Chieftain Development in 1964. Mrs. Ondrack is a
former director of TELUS Corporation and has also served as a public governor of
the Canadian Institute of Chartered Accountants.

JAMES B. LEWIS was appointed Senior Vice President, Operations of Chieftain on
October 1, 1999. Mr. Lewis was a consultant to Chieftain from May 1998 until
September 1999. He was employed by Enron Oil & Gas Company as Vice President and
General Manager, Offshore Division from 1992 to April 1998 and Offshore
Operations Manager from 1984 to 1992. Prior to joining Enron, he was Vice
President, Acquisitions for Conquest Petroleum for two years and, prior to his
employment with Conquest, he was employed by Tenneco Oil Company in various
engineering capacities. Mr. Lewis holds a degree from Louisiana State University
in petroleum engineering. He is a registered engineer in Texas and Louisiana and
is a member of the Society of Petroleum Engineers.

S. JAY MILNER has been Vice President, Drilling and Production of Chieftain
since 1995. From the time of Chieftain's incorporation in 1988 to 1995, he held
the position of Manager, Drilling and Production. Prior to 1988, Mr. Milner was
Manager, Drilling and Production of Chieftain Development Co. Ltd. Before
joining Chieftain Development, he was employed by Dome Petroleum Limited as a
drilling engineer. Mr. Milner holds a degree in engineering from the University
of Alberta. Mr. Milner is Stanley A. Milner's son.

RONALD J. STEFURE has been Vice President and Controller of Chieftain since
1995. From October 1989 to 1995, he was Chieftain's Controller. Prior to that
date, Mr. Stefure was Accounting Manager with Chieftain Development Co. Ltd.

HUGH J. KELLY, an energy consultant, has been a Director of Chieftain since
July 1989. Mr. Kelly joined Ocean Drilling & Exploration Company ("ODECO") in
1958. He became President and a Director of ODECO in 1974 and, in addition, was
Chief Executive Officer from 1977 until 1989. He was associated

                                      S-37
<PAGE>
with Chevron Oil Company for seven years before joining Ocean Drilling.
Mr. Kelly is a director of Tidewater Inc. and Gulf Island Fabrication Inc. and a
former director of Baroid Corporation, Central Louisiana Electric Co., and
Hibernia National Bank. He is also a former chairman of Mid-Continent Oil and
Gas Association and the National Ocean Industries Association. Mr. Kelly is a
graduate of Louisiana State University Law School.

JOHN E. MAYBIN, who is a consultant, has been a Director of Chieftain since
June 1991. He has held executive positions with various companies, including
Canadian Utilities Limited and petroleum-related organizations. Mr. Maybin is a
director of Colmac Energy, Inc. and is a former director of Alberta Energy
Company Ltd., International Mill Services Limited and Majestic Contractors
Limited. He is also a former chairman of the Canadian Gas Association.
Mr. Maybin is a graduate of the University of Alberta and Princeton University.

LOUIS G. MUNIN, a financial consultant, has been a Director of Chieftain since
February 1989. A graduate of DePaul University and a certified public
accountant, Mr. Munin was engaged in public accounting with the firm of Arthur
Andersen from 1955 until 1966. After leaving Arthur Andersen, he held various
executive positions with General Portland Cement Company and its successor,
Lafarge Corporation, through 1988. He is a director of Lafarge Canada Inc. and
Walden Residential Properties, Inc. and also serves as a member of the Finance
Committee of the Board of Directors of Lafarge Corporation.

STUART T. PEELER, a petroleum industry consultant, has been a Director of
Chieftain since February 1989. A graduate of Stanford University Law,
Mr. Peeler practiced law with the firm of Musick, Peeler & Garrett from 1953
until 1973 and held senior executive positions with independent energy
companies. He was Vice Chairman of Supron Energy Corporation from 1978 to 1982,
Senior Vice President and a director of Santa Fe International Corporation from
1975 to 1981 and Chairman and Chief Executive Officer of Statex Petroleum, Inc.
from 1982 to 1989. Mr. Peeler is a director of Homestake Mining Company and a
former director of CalMat Co. (formerly California Portland Cement Company) and
Homestake Gold of Australia, Ltd. He is a trustee of the Grand Canyon National
Park Foundation and Trustee Emeritus of The J. Paul Getty Trust.

                                      S-38
<PAGE>
                         CHIEFTAIN INTERNATIONAL, INC.
                            AND SUBSIDIARY COMPANIES

                   INDEX TO CONSOLIDATED FINANCIAL STATEMENTS

<TABLE>
<CAPTION>
                                                                PAGE
                                                              --------
<S>                                                           <C>
Audited Consolidated Financial Statements

  Auditors' Report..........................................     F-2

  Consolidated Balance Sheet................................     F-3

  Consolidated Statement of Income (Loss) and Deficit.......     F-4

  Consolidated Statement of Changes in Financial Position...     F-5

  Notes to Consolidated Financial Statements................     F-6

Unaudited Consolidated Condensed Financial Statements

  Consolidated Condensed Balance Sheet......................    F-24

  Consolidated Condensed Statement of Income (Loss).........    F-25

  Consolidated Condensed Statement of Cash Flows............    F-26

  Notes to Consolidated Condensed Financial Statements......    F-27
</TABLE>

                                      F-1
<PAGE>
                                AUDITORS' REPORT

We have audited the consolidated balance sheets of Chieftain
International, Inc. as at December 31, 1998 and 1997 and the consolidated
statements of income (loss) and deficit and changes in financial position for
each of the years in the three-year period ended December 31, 1998. These
financial statements are the responsibility of the Company's management. Our
responsibility is to express an opinion on these financial statements based on
our audits.

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

In our opinion, these consolidated financial statements present fairly, in all
material respects, the financial position of the Company as at December 31, 1998
and 1997 and the results of its operations and the changes in its financial
position for each of the years in the three-year period ended December 31, 1998
in accordance with generally accepted accounting principles in Canada.

PricewaterhouseCoopers LLP
Chartered Accountants
Edmonton, Alberta

February 4, 1999

                                      F-2
<PAGE>
             CHIEFTAIN INTERNATIONAL, INC. AND SUBSIDIARY COMPANIES

                           CONSOLIDATED BALANCE SHEET

                    (U.S. $ IN THOUSANDS EXCEPT SHARE DATA)

(Full Cost Method of Accounting)

<TABLE>
<CAPTION>
                                                               AS AT DECEMBER 31,
                                                              ---------------------
                                                                1998        1997
                                                              ---------   ---------
<S>                                                           <C>         <C>
ASSETS
Current assets:
  Cash and short-term deposits..............................  $  10,613   $  26,925
  Accounts receivable.......................................     14,030      10,862
  Other.....................................................        282         606
                                                              ---------   ---------
                                                                 24,925      38,393
                                                              ---------   ---------
Capital assets, at cost:
  Natural resource properties including exploration and
    development thereon (Note(1)(e))........................    552,380     459,807
  Other capital assets......................................      2,119       2,047
                                                              ---------   ---------
                                                                554,499     461,854
  Less: Accumulated depletion and amortization..............    266,022     218,564
                                                              ---------   ---------
                                                                288,477     243,290
                                                              ---------   ---------
Deferred income taxes.......................................      5,182       3,442
                                                              ---------   ---------
                                                              $ 318,584   $ 285,125
                                                              =========   =========
LIABILITIES AND SHAREHOLDERS' EQUITY
Current liabilities:
  Accounts payable and accrued..............................  $  22,533   $  15,717

Long-term debt (Note 2).....................................     40,000          --

Abandonment cost accrual....................................      7,421       6,575

Deferred income taxes.......................................     13,684      13,367

Shareholders' equity:
  Preferred shares of a subsidiary (Note 3).................     63,403      63,403
  Share capital (Note 4)--
    Authorized--an unlimited number of--
      First preferred shares
      Second preferred shares
      Common shares
    Issued--
      13,355,891 common shares (1997--13,622,375)...........    189,108     192,845
  Contributed surplus.......................................         --         307
  Deficit...................................................    (17,565)     (7,089)
                                                              ---------   ---------
                                                                234,946     249,466
                                                              ---------   ---------
                                                              $ 318,584   $ 285,125
                                                              =========   =========
</TABLE>

Approved by the Board

<TABLE>
<S>                                            <C>
/s/ S. A. Milner                               /s/ L. G. Munin
- --------------------------------------------   --------------------------------------------
S. A. Milner, Director                         L. G. Munin, Director
</TABLE>

                See Notes to Consolidated Financial Statements.

                                      F-3
<PAGE>
             CHIEFTAIN INTERNATIONAL, INC. AND SUBSIDIARY COMPANIES

                        CONSOLIDATED STATEMENT OF INCOME
                               (LOSS) AND DEFICIT

           (U.S. $ IN THOUSANDS EXCEPT SHARES AND PER SHARE AMOUNTS)

<TABLE>
<CAPTION>
                                                                 YEAR ENDED DECEMBER 31,
                                                           ------------------------------------
                                                              1998         1997         1996
                                                           ----------   ----------   ----------
<S>                                                        <C>          <C>          <C>
Production revenue.......................................  $   74,861   $   84,219   $   72,838
  Less: Royalties........................................      13,246       14,592       12,226
                                                           ----------   ----------   ----------
Production revenue, net of royalties.....................      61,615       69,627       60,612
Interest and other revenue (Note 5)......................       2,776        2,428        2,487
                                                           ----------   ----------   ----------
                                                               64,391       72,055       63,099
                                                           ----------   ----------   ----------

Production costs.........................................      16,355       13,325       12,220
General and administrative expenses......................       4,796        4,308        3,972
Interest.................................................         437           --           --
Depletion and amortization...............................      42,081       36,951       30,920
Additional depletion:  Libyan properties.................       5,144           --           --
                      UK properties......................       1,100           --           --
                                                           ----------   ----------   ----------
                                                               69,913       54,584       47,112
                                                           ----------   ----------   ----------

Income (loss) before income taxes and dividends on
  preferred shares of a subsidiary.......................      (5,522)      17,471       15,987

Income taxes (Note 6):
  Current................................................          14            7          124
  Deferred...............................................      (1,423)       7,304        6,079
                                                           ----------   ----------   ----------
                                                               (1,409)       7,311        6,203
                                                           ----------   ----------   ----------
Income (loss) before dividends on preferred shares of a
  subsidiary.............................................      (4,113)      10,160        9,784
Dividends paid on preferred shares of a subsidiary.......       4,942        4,942        4,942
                                                           ----------   ----------   ----------
Net income (loss) applicable to common shares............      (9,055)       5,218        4,842
Deficit, beginning of year...............................      (7,089)     (12,307)     (17,149)
Cost of purchase of common shares in excess of stated
  capital (Note 4).......................................      (1,421)          --           --
                                                           ----------   ----------   ----------
Deficit, end of year.....................................  $  (17,565)  $   (7,089)  $  (12,307)
                                                           ==========   ==========   ==========
Net income (loss) per common share (Note 7)..............  $    (0.67)  $     0.38   $     0.37
                                                           ==========   ==========   ==========
Weighted average number of common shares outstanding.....  13,480,067   13,620,728   13,065,414
                                                           ==========   ==========   ==========
</TABLE>

                See Notes to Consolidated Financial Statements.

                                      F-4
<PAGE>
             CHIEFTAIN INTERNATIONAL, INC. AND SUBSIDIARY COMPANIES

                           CONSOLIDATED STATEMENT OF
                         CHANGES IN FINANCIAL POSITION

                             (U.S. $ IN THOUSANDS)

<TABLE>
<CAPTION>
                                                                 YEAR ENDED DECEMBER 31,
                                                              ------------------------------
                                                                1998       1997       1996
                                                              --------   --------   --------
<S>                                                           <C>        <C>        <C>
Operating activities:
  Net income (loss) applicable to common shares.............  $ (9,055)  $  5,218   $  4,842
  Items not requiring a current cash outlay:
    Depletion and amortization..............................    48,325     36,951     30,920
    Deferred income taxes...................................    (1,423)     7,304      6,079
                                                              --------   --------   --------
  Cash flow from operations.................................    37,847     49,473     41,841
  Change in non-cash operating working capital:
    Accounts receivable.....................................    (3,168)       337     (2,936)
    Other current assets....................................       324       (313)       199
    Accounts payable and accrued............................       164        992       (901)
    Dividend payable........................................        --         --     (1,236)
                                                              --------   --------   --------
                                                                35,167     50,489     36,967
                                                              --------   --------   --------
  Financing activities:
    Issue of common shares..................................       437        975     50,097
    Purchase of common shares for cancellation..............    (5,902)      (849)        --
    Increase in long-term debt..............................    40,000         --         --
    Financing costs.........................................        --         --     (2,440)
                                                              --------   --------   --------
                                                                34,535        126     47,657
                                                              --------   --------   --------
  Investing activities:
    Lease acquisition, exploration and development costs....   (91,690)   (69,453)   (56,636)
    Purchase of producing natural gas and oil properties....      (883)        --     (2,077)
    Sale of producing properties............................        --         --      1,040
                                                              --------   --------   --------
                                                               (92,573)   (69,453)   (57,673)
    Purchase of other capital assets........................       (93)      (324)      (187)
    Change in investing accounts payable and accrued........     6,652      3,638      5,110
                                                              --------   --------   --------
                                                               (86,014)   (66,139)   (52,750)
                                                              --------   --------   --------
  Change in cash and short-term deposits....................   (16,312)   (15,524)    31,874
  Cash and short-term deposits, beginning of year...........    26,925     42,449     10,575
                                                              --------   --------   --------
  Cash and short-term deposits, end of year.................  $ 10,613   $ 26,925   $ 42,449
                                                              ========   ========   ========
</TABLE>

                See Notes to Consolidated Financial Statements.

                                      F-5
<PAGE>
             CHIEFTAIN INTERNATIONAL, INC. AND SUBSIDIARY COMPANIES

                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

                        DECEMBER 31, 1998, 1997 AND 1996

The Company is engaged in natural gas and oil exploration, development and
production primarily in the United States and also in the UK sector of the North
Sea and in Libya. The Consolidated Financial Statements are expressed in United
States currency as most of the Company's assets and operations are denominated
in US dollars.

1.  SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

    (A) ACCOUNTING PRINCIPLES

    The Company's financial statements are prepared in conformity with Canadian
generally accepted accounting principles. The preparation of financial
statements in conformity with generally accepted accounting principles requires
management to make informed judgements and estimates. Actual results may differ
from those estimates. Material differences between Canadian and US accounting
principles that affect the Company are referred to in Note 11, which provides
the effects of the differences on earnings and balance sheet accounts.

    (B) PRINCIPLES OF CONSOLIDATION

    The Consolidated Financial Statements include the accounts of the Company
and its subsidiary companies, all of which are wholly-owned except for Chieftain
International Funding Corp., a US subsidiary which in 1992 issued 2,726,700
preferred shares to the public. These preferred shares are convertible into
common shares of Chieftain International, Inc. See Note 3.

Acquisitions of subsidiaries and businesses have been accounted for by the
purchase method and accordingly only income or losses since date of acquisition
are included in the Consolidated Statement of Income.

    (C) FOREIGN CURRENCY TRANSLATION

    Canadian and other foreign currency amounts have been translated into US
currency on the following bases: monetary assets and liabilities at the year-end
rates of exchange; non-monetary assets and liabilities at historical exchange
rates; and revenue and expenses at monthly average exchange rates during the
year. Translation gains or losses are reflected in the Consolidated Statement of
Income.

    (D) FINANCIAL ASSETS AND LIABILITIES

    The Company's financial instruments that are included in the Consolidated
Balance Sheet are comprised of cash and short-term deposits, accounts
receivable, all current liabilities and long-term debt, the fair values of which
approximate their carrying amounts due to their short-term or current rate
nature. Cash and short-term deposits include minimum risk certificates
guaranteed by a major Canadian bank and are purchased three months or less from
maturity. Accounts receivable are subject to normal oil and natural gas industry
credit risks. Long-term debt is subject to normal floating interest rate risk.

    (E) NATURAL RESOURCE PROPERTIES

    The Company accounts for natural gas and oil properties in accordance with
Canadian guidelines on full cost accounting.

                                      F-6
<PAGE>
             CHIEFTAIN INTERNATIONAL, INC. AND SUBSIDIARY COMPANIES

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

                        DECEMBER 31, 1998, 1997 AND 1996

1.  SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)

Under this method, all costs associated with the acquisition, exploration and
development of natural gas and oil properties are capitalized in cost centers on
a country-by-country basis. Depletion is calculated using the unit-of-production
method based on gross proved reserves before royalties and combining oil and
natural gas on an energy equivalent basis. Future well abandonment and site
restoration costs are included in the calculation of depletion expense and are
based on current engineering estimates in accordance with current regulations
and industry practices. Actual costs, when incurred, are charged against the
abandonment cost accrual.

A ceiling test is applied to ensure that capitalized costs do not exceed
estimated future net revenues less certain applicable costs. There is
uncertainty as to the prices at which natural gas and oil produced by the
Company may be sold. The application of such ceiling test to US property
carrying costs at December 31, 1998, using the $12.27 average oil and natural
gas liquids ("ngls") price received by the Company during the year and the $2.15
December 31, 1998 natural gas price, required no write-down. A write-down of
$10,614,000, after providing for tax recoveries of $5,842,000, would have been
required had December 31, 1998 prices, $2.15 for natural gas and $9.72 for oil
and ngls, been used. An impairment provision of $2,849,000, after providing for
tax recoveries of $2,295,000, was recorded in respect of one of the Libyan
concessions; and a write-down of $609,000, after providing for tax recoveries of
$491,000, was recorded in respect of the UK properties.

The following weighted average field prices were used in the determination of
the Company's US future net revenues for purposes of the ceiling test:

<TABLE>
<CAPTION>
                                                            AS AT DECEMBER 31,
                                                      ------------------------------
                                                        1998       1997       1996
                                                      --------   --------   --------
<S>                                                   <C>        <C>        <C>
Oil--per barrel.....................................   $12.35     $16.92     $24.29
                                                       ======     ======     ======
Ngls--per barrel....................................   $10.19     $15.14     $21.66
                                                       ======     ======     ======
Oil & ngls--per barrel..............................   $12.27     $16.69     $24.03
                                                       ======     ======     ======
Natural gas--per thousand cubic feet ("Mcf")........   $ 2.15     $ 2.74     $ 3.43
                                                       ======     ======     ======
</TABLE>

A field price of $1.74 (1997--$1.76; 1996--$2.04) per thousand cubic feet was
used in the determination of the Company's UK future net revenues for purposes
of the ceiling test.

Depletion rates per physical unit of US production are as follows:

<TABLE>
<CAPTION>
                                                    NATURAL GAS   CRUDE OIL & NGLS
                                                     (PER MCF)      (PER BARREL)
                                                    -----------   ----------------
<S>                                                 <C>           <C>
Year ended December 31, 1996......................     $1.03           $6.16
                                                       =====           =====
Year ended December 31, 1997......................     $1.11           $6.68
                                                       =====           =====
Year ended December 31, 1998......................     $1.16           $6.97
                                                       =====           =====
</TABLE>

The depletion rate per physical unit of UK natural gas production was $0.81 per
Mcf for the year ended December 31, 1998 (1997--$0.81; 1996--$0.56).

                                      F-7
<PAGE>
             CHIEFTAIN INTERNATIONAL, INC. AND SUBSIDIARY COMPANIES

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

                        DECEMBER 31, 1998, 1997 AND 1996

1.  SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)

General and administrative costs relating directly to lease acquisition,
exploration and development activities have been capitalized as follows:

<TABLE>
<CAPTION>
                                                         AS AT DECEMBER 31,
                                                   ------------------------------
                                                     1998       1997       1996
                                                   --------   --------   --------
                                                       (U.S. $ IN THOUSANDS)
<S>                                                <C>        <C>        <C>
Lease acquisition................................  $   857    $   694    $   837
Exploration......................................    1,740      1,470      1,547
Development......................................    1,715      1,387      1,254
                                                   -------    -------    -------
                                                   $ 4,312    $ 3,551    $ 3,638
                                                   =======    =======    =======
</TABLE>

At December 31, 1998, Libyan property carrying costs of $9.9 million
(1997--$14.6 million) were excluded from depletion calculations pending
evaluation.

    (F) LAND, BUILDINGS AND OTHER EQUIPMENT

    Amortization is provided as follows:

<TABLE>
<CAPTION>
                                                        RATE PER
                                                         ANNUM        METHOD
                                                        --------   -------------
<S>                                                     <C>        <C>
Buildings.............................................       5%    Straight-line
Furniture, office equipment and leasehold
  improvements........................................   10-20%    Straight-line
</TABLE>

Expenditures for renewals and betterments which materially increase the
estimated useful life of buildings and equipment are capitalized; expenditures
for repairs and maintenance are charged to income. Costs and accumulated
amortization of assets retired or sold are removed from the asset and related
accumulated amortization accounts; losses and gains thereon are included in the
Consolidated Statement of Income as depletion and amortization.

    (G) INCOME TAXES

    The Company follows the tax allocation method of accounting for the tax
effect of all timing differences between taxable income and accounting income.
Thus, provision is made currently for taxes deferred as a result of claiming for
tax purposes deductions in excess of amounts charged to income in the books,
principally natural resource lease acquisition costs, intangible exploration,
development and drilling costs and costs of tangible capital assets.

    (H) COMPARATIVE FIGURES

    Certain 1997 information has been reclassified to conform to the 1998
presentation.

2.  REVOLVING CREDIT AND TERM LOAN ARRANGEMENTS

    In 1997 the Company arranged an unsecured revolving credit facility with a
syndicate of banks. The facility, in the amount of $100 million or the Canadian
dollar equivalent, is fully revolving for 364 day periods with extensions at the
option of the lenders upon notice from the Company. If not

                                      F-8
<PAGE>
             CHIEFTAIN INTERNATIONAL, INC. AND SUBSIDIARY COMPANIES

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

                        DECEMBER 31, 1998, 1997 AND 1996

2.  REVOLVING CREDIT AND TERM LOAN ARRANGEMENTS (CONTINUED)

extended, the facility converts to term loans repayable over a period not
exceeding four years. Advances under the facility bear interest at Canadian
prime or US base rate, or at bankers' acceptance rates or LIBOR plus applicable
margins. Certain financial tests are required to be met quarterly. Under this
facility, $40 million was utilized at December 31, 1998, carrying a weighted
average interest rate of 5.65%.

3.  PREFERRED SHARES OF A SUBSIDIARY

    Chieftain International Funding Corp. ("Funding"), a subsidiary of Chieftain
International (U.S.) Inc., sold 2,726,700 shares of $1.8125 cumulative
convertible redeemable preferred shares at $25.00 per share in a 1992 public
offering in the United States. The preferred shares are redeemable, at the
option of Funding, at $25.6042 per share during 1999, declining to $25.00 per
share after December 31, 2001, plus accumulated and unpaid dividends. Each
preferred share has a liquidation preference of $25.00 and is convertible at any
time into 1.25 Common Shares of Chieftain International, Inc. at the option of
the holder.

4.  SHARE CAPITAL

    (A) COMMON SHARES

<TABLE>
<CAPTION>
                                                          YEAR ENDED DECEMBER 31,
                                  ------------------------------------------------------------------------
                                           1998                     1997                     1996
                                  ----------------------   ----------------------   ----------------------
                                    NUMBER       SHARE       NUMBER       SHARE       NUMBER       SHARE
                                      OF        CAPITAL        OF        CAPITAL        OF        CAPITAL
                                    SHARES      ACCOUNT      SHARES      ACCOUNT      SHARES      ACCOUNT
                                  ----------   ---------   ----------   ---------   ----------   ---------
                                                           (U.S. $ IN THOUSANDS)
<S>                               <C>          <C>         <C>          <C>         <C>          <C>
Balance, beginning of year......  13,622,375   $ 192,845   13,591,763   $ 192,381   10,546,100   $ 143,635
Share options exercised.........      28,216         437       66,912         975       75,663       1,092
Shares purchased and
  cancelled*....................    (294,700)     (4,174)     (36,300)       (511)          --          --
Shares issued for cash**........          --          --           --          --    2,970,000      47,654
                                  ----------   ---------   ----------   ---------   ----------   ---------
Balance, end of year............  13,355,891   $ 189,108   13,622,375   $ 192,845   13,591,763   $ 192,381
                                  ==========   =========   ==========   =========   ==========   =========
</TABLE>

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

  * Pursuant to normal course issuer bid.

 ** Reduced by costs of issue of $2,440, less related deferred taxes of $1,089.

In the first quarter of 1996, the Company sold 2,970,000 common shares, by way
of a public offering in the United States and Canada, at $16.50 per share
(C$22.75).

    (B) COMMON SHARES RESERVED

    At December 31, 1998, 1,130,875 (1997--1,159,091; 1996--1,226,003) of the
authorized but unissued common shares of the Company were reserved for issuance
under the Share Option Plan. See Note 4(d).

The Company has reserved 3,408,375 common shares for issuance pursuant to the
conversion provisions of the preferred shares of a subsidiary. See Note 3.

                                      F-9
<PAGE>
             CHIEFTAIN INTERNATIONAL, INC. AND SUBSIDIARY COMPANIES

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

                        DECEMBER 31, 1998, 1997 AND 1996

4.  SHARE CAPITAL (CONTINUED)

    (C) CONTRIBUTED SURPLUS

    Contributed surplus represented the excess of original net issue price over
purchase price of shares purchased and cancelled pursuant to issuer bids in
1995, 1997 and 1998.

    (D) SHARE OPTION PLAN (THE "PLAN")

    The Plan provides for the granting of options to employees, directors and
consultants to purchase common shares of the Company. Each option expires not
later than ten years from the date it was granted. Options are exercisable as to
one-third of the granted amount on or after each of the first three
anniversaries of the date of grant or over such longer period as may be
determined by the directors. The option price for shares in respect of which an
option is granted under the Plan is not less than the market price on the date
of grant. At December 31, 1998, options were outstanding to 47 participants in
the Plan.

The following is a summary of activity related to the Plan for the years ended
December 31, 1998, 1997 and 1996.

<TABLE>
<CAPTION>
                                                           YEAR ENDED DECEMBER 31,
                                      -----------------------------------------------------------------
                                              1998                   1997                  1996
                                      --------------------   --------------------   -------------------
                                                  WEIGHTED               WEIGHTED              WEIGHTED
                                       NUMBER     AVERAGE     NUMBER     AVERAGE     NUMBER    AVERAGE
                                         OF        OPTION       OF        OPTION       OF       OPTION
                                       SHARES      PRICE      SHARES      PRICE      SHARES     PRICE
                                      ---------   --------   ---------   --------   --------   --------
<S>                                   <C>         <C>        <C>         <C>        <C>        <C>
Outstanding at beginning of year....  1,057,673    $16.47      909,253    $15.10    980,250     $14.90
Granted.............................     65,000     21.08      228,000     21.35     15,000      23.75
Exercised...........................    (28,216)    15.49      (66,912)    14.47    (75,663)     14.22
Forfeited...........................    (10,600)    20.07      (12,668)    16.06    (10,334)     15.39
                                      ---------              ---------              -------
Outstanding at end of year..........  1,083,857     16.74    1,057,673     16.47    909,253      15.10
                                      =========              =========              =======

Options exercisable at year end.....    869,858                707,738              558,319
                                      =========              =========              =======
</TABLE>

                                      F-10
<PAGE>
             CHIEFTAIN INTERNATIONAL, INC. AND SUBSIDIARY COMPANIES

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

                        DECEMBER 31, 1998, 1997 AND 1996

4.  SHARE CAPITAL (CONTINUED)

The following table summarizes information about options outstanding at
December 31, 1998.

<TABLE>
<CAPTION>
                   OPTIONS OUTSTANDING                       OPTIONS EXERCISABLE
- ----------------------------------------------------------   -------------------
                                     WEIGHTED
                                      AVERAGE     WEIGHTED              WEIGHTED
                         NUMBER      REMAINING    AVERAGE     NUMBER    AVERAGE
      RANGE OF             OF       CONTRACTUAL    OPTION       OF       OPTION
    OPTION PRICES        SHARES        LIFE        PRICE      SHARES     PRICE
- ---------------------   ---------   -----------   --------   --------   --------
<S>                     <C>         <C>           <C>        <C>        <C>
  $13.50 to $15.63        694,523    4.9 years     $14.37    694,523     $14.37
   18.00 to  20.87        118,334    4.6 years      19.16     93,334      19.47
   21.23 to  23.75        271,000    8.5 years      21.75     82,001      21.67
                        ---------                            -------
                        1,083,857                            869,858
                        =========                            =======
</TABLE>

5.  INTEREST AND OTHER REVENUE

    Interest and other revenue for the first quarter of 1998 included
$1.6 million awarded by the courts pursuant to a successful claim for recovery
of excess transportation charges incurred from 1990 through 1997. The award
comprises transportation charges, legal fees and judgment interest in the
amounts of $1,129,000, $282,000 and $189,000, respectively.

6.  INCOME TAXES

    Income tax expense is made up of the following components:

<TABLE>
<CAPTION>
                                           YEAR ENDED DECEMBER 31,
                       ---------------------------------------------------------------
                              1998                  1997                  1996
                       -------------------   -------------------   -------------------
                        CANADA       US       CANADA       US       CANADA       US
                       --------   --------   --------   --------   --------   --------
                                            (U.S. $ IN THOUSANDS)
<S>                    <C>        <C>        <C>        <C>        <C>        <C>
Income (loss) before
  income taxes and
  dividends on
  preferred shares of
  a subsidiary.......  $ (6,829)  $ 1,307    $  2,072   $ 15,399   $  1,461   $ 14,526
                       ========   =======    ========   ========   ========   ========
Income taxes
  (recovery)
  Current............  $     14   $    --    $      7   $     --   $    124   $     --
  Deferred...........    (1,740)      317       2,007      5,297        912      5,167
                       --------   -------    --------   --------   --------   --------
                       $ (1,726)  $   317    $  2,014   $  5,297   $  1,036   $  5,167
                       ========   =======    ========   ========   ========   ========
</TABLE>

                                      F-11
<PAGE>
             CHIEFTAIN INTERNATIONAL, INC. AND SUBSIDIARY COMPANIES

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

                        DECEMBER 31, 1998, 1997 AND 1996

6.  INCOME TAXES (CONTINUED)

Deferred income tax expense results from timing differences between the
recognition of expenses for tax and financial statement purposes as explained in
Note 1(g). The sources of these differences are as follows:

<TABLE>
<CAPTION>
                              1998                  1997                  1996
                       -------------------   -------------------   -------------------
                        CANADA       US       CANADA       US       CANADA       US
                       --------   --------   --------   --------   --------   --------
                                            (U.S. $ IN THOUSANDS)
<S>                    <C>        <C>        <C>        <C>        <C>        <C>
Amortization of
  buildings and
  equipment..........  $    (27)  $     18   $  (112)   $  (275)    $    3    $    340
Depletion of natural
  resource
  properties.........    (2,073)     6,104       (68)     6,011        805       5,898
Financing costs......       243         --       338         --        348          --
Tax loss carry
  forward............       154     (5,839)    1,846       (430)      (230)     (1,143)
Other................       (37)        34         3         (9)       (14)         72
                       --------   --------   -------    -------     ------    --------
                       $ (1,740)  $    317   $ 2,007    $ 5,297     $  912    $  5,167
                       ========   ========   =======    =======     ======    ========
</TABLE>

The actual tax rate differs from the expected tax rate for the following
reasons:

<TABLE>
<CAPTION>
                                                    YEAR ENDED DECEMBER 31,
                                                 ------------------------------
                                                   1998       1997       1996
                                                 --------   --------   --------
                                                     (U.S. $ IN THOUSANDS)
<S>                                              <C>        <C>        <C>
Tax at statutory rate of 44.62%
  (Combined Canadian federal and provincial
    rate)......................................  $ (2,465)  $  7,796   $  7,133
Add (deduct) the effect of:
  Lower income tax rate on earnings of US
    subsidiaries...............................       (81)    (1,373)    (1,263)
  Canadian income tax on exchange loss (gain)
    which is eliminated upon consolidation.....       511        362        (56)
  Other........................................       626        526        389
                                                 --------   --------   --------
Tax at effective rate..........................  $ (1,409)  $  7,311   $  6,203
                                                 ========   ========   ========
Effective tax rate.............................      25.5%      41.8%      38.8%
                                                 ========   ========   ========
</TABLE>

7.  PER SHARE AMOUNTS

    Net income (loss) per common share is computed by dividing net income (loss)
applicable to common shares by the weighted average number of common shares
outstanding during the year.

In the calculation of fully diluted earnings per share, shares outstanding are
adjusted for share options and shares issuable on conversion of preferred
shares. Earnings are adjusted by the amount of imputed interest on share option
proceeds and preferred share dividends. Earnings were not diluted during the
periods shown.

                                      F-12
<PAGE>
             CHIEFTAIN INTERNATIONAL, INC. AND SUBSIDIARY COMPANIES

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

                        DECEMBER 31, 1998, 1997 AND 1996

8.  PENSION COSTS AND OBLIGATIONS

    The Company contributed $145,300, $144,254 and $103,455 for 1998, 1997 and
1996, respectively, to defined contribution plans. Under a supplementary defined
contribution plan established in 1991, costs of $198,294, $162,384 and $127,358
for 1998, 1997 and 1996, respectively, and the related liability are recorded in
the accounts.

The Company has established no other retirement benefit plans.

9.  DISAGGREGATED INFORMATION

    The Company has only a single reportable segment with activities as
explained in the preamble to the Notes. Production revenue, net of royalties,
all of which arises from external customers, is attributed to the country in
which the underlying production occurred. Most of the US natural gas, oil and
ngls produced by the Company are marketed by a single aggregator. Production
revenues, net of royalties, associated with the aggregator were $46,340,000
(1997--$50,250,000; 1996--$43,611,000). The Company's oil production from the
Aneth and Ratherford Units in the Four Corners area of Utah is sold under
successive term contracts to a regional refiner. Production revenues, net of
royalties, associated with sales to the regional refiner were $8,207,000
(1997--$10,880,000; 1996--$10,641,000). The Company believes that alternative
marketing arrangements would be readily available for its natural gas, oil and
liquids.

<TABLE>
<CAPTION>
                                                  YEAR ENDED DECEMBER 31,
                                             ---------------------------------
                                               1998        1997        1996
                                             ---------   ---------   ---------
                                                   (U.S. $ IN THOUSANDS)
<S>                                          <C>         <C>         <C>
Production revenue, net of royalties
  United States............................  $  56,199   $  63,227   $  56,457
  United Kingdom...........................      4,411       6,231       4,155
  Libya....................................      1,005         169          --
                                             ---------   ---------   ---------
Total production revenues, net of
  royalties................................     61,615      69,627      60,612
Interest and other revenue.................      2,776       2,428       2,487
                                             ---------   ---------   ---------
                                             $  64,391   $  72,055   $  63,099
                                             =========   =========   =========

Net capital assets
  United States............................  $ 267,020   $ 213,856   $ 176,672
  United Kingdom...........................     11,337      14,733      17,778
  Libya....................................      9,835      14,373      13,297
  Canada and other.........................        285         328         305
                                             ---------   ---------   ---------
                                             $ 288,477   $ 243,290   $ 208,052
                                             =========   =========   =========
</TABLE>

10.  UNCERTAINTY DUE TO THE YEAR 2000

    During the past three years the Company has made changes to its computer
systems in order that date related information can be processed correctly after
December 31, 1999 and the Company believes that such capability will be attained
with respect to its internal systems.

                                      F-13
<PAGE>
             CHIEFTAIN INTERNATIONAL, INC. AND SUBSIDIARY COMPANIES

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

                        DECEMBER 31, 1998, 1997 AND 1996

10.  UNCERTAINTY DUE TO THE YEAR 2000 (CONTINUED)

Despite these efforts, it is not possible to be certain that all aspects of the
year 2000 issue affecting the Company, including those related to the provision
of goods and services by third parties, will be fully resolved before the year
2000.

11. UNITED STATES ACCOUNTING PRINCIPLES

    (A) FULL COST ACCOUNTING

    US full cost accounting rules differ materially from the Canadian full cost
accounting guidelines followed by the Company. In determining the limitation on
carrying values, US rules require the discounting of future net revenues at 10%,
and Canadian guidelines require the use of undiscounted future net revenues and
the deduction of estimated future administrative and financing costs. During
1998 an impairment adjustment would have been required under US accounting
rules. The quarterly test required by US accounting rules, using December 31 US
natural gas and oil prices of $2.15 per Mcf and $9.72 per barrel, and June 30 US
natural gas and oil prices of $2.09 per Mcf and $12.40 per barrel to determine
future net revenues, would have resulted in a write-down of US property carrying
costs of $42.6 million, after providing for tax recoveries of $22.9 million, at
December 31; and $16.1 million, after providing for tax recoveries of
$8.6 million, at June 30. Under Canadian guidelines the test resulted in a
write-down of UK property carrying costs of $0.6 million, after providing for
tax recoveries of $0.5 million; no corresponding write-down was required under
US accounting rules. Such write-downs will result in reduced depletion expense,
under US rules, for subsequent periods.

    (B) INCOME TAXES

    US accounting principles require corporations to account for deferred income
taxes by the liability method. The effect on the Company of the application of
such method is not material.

    (C) EARNINGS PER SHARE

    US accounting principles require share options to be included in fully
diluted earnings (loss) per common share, where dilutive, assuming that the
share options are exercised using the treasury stock method.

                                      F-14
<PAGE>
             CHIEFTAIN INTERNATIONAL, INC. AND SUBSIDIARY COMPANIES

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

                        DECEMBER 31, 1998, 1997 AND 1996

11. UNITED STATES ACCOUNTING PRINCIPLES (CONTINUED)

    (D) EFFECT ON EARNINGS

    The effect on consolidated earnings of the differences between Canadian and
US accounting principles is summarized as follows:

<TABLE>
<CAPTION>
                                              YEAR ENDED DECEMBER 31,
                                     ------------------------------------------
                                         1998           1997           1996
                                     ------------   ------------   ------------
                                                (U.S. $ IN THOUSANDS
                                        EXCEPT SHARES AND PER SHARE AMOUNTS)
<S>                                  <C>            <C>            <C>
Net income (loss) applicable to
  common shares, as reported.......  $     (9,055)  $      5,218   $      4,842
Additional depletion...............       (89,153)            --             --
                                     ------------   ------------   ------------
                                          (98,208)         5,218          4,842
Reduction in depletion expense.....         4,235          3,177          2,381
Reduction (increase) in deferred
  tax provision....................        30,010           (885)        (1,021)
                                     ------------   ------------   ------------
Net income (loss) applicable to
  common shares under US accounting
  principles.......................  $    (63,963)  $      7,510   $      6,202
                                     ============   ============   ============
Net income (loss) per common share
  under US accounting principles:
  Basic............................  $      (4.75)  $       0.55   $       0.47
                                     ============   ============   ============
  Fully diluted....................  $      (4.75)  $       0.54   $       0.46
                                     ============   ============   ============
Fully diluted number of common
  shares outstanding...............    13,480,067     13,858,593     13,446,684
                                     ============   ============   ============
</TABLE>

    (E) EFFECT ON BALANCE SHEET

    The effect on the Consolidated Balance Sheet of the differences between
Canadian and US accounting principles is as follows:

<TABLE>
<CAPTION>
                                                   AS AT DECEMBER 31,
                                      ---------------------------------------------
                                              1998                    1997
                                      ---------------------   ---------------------
                                                  UNDER US                UNDER US
                                         AS      ACCOUNTING      AS      ACCOUNTING
                                      REPORTED   PRINCIPLES   REPORTED   PRINCIPLES
                                      --------   ----------   --------   ----------
                                                  (U.S. $ IN THOUSANDS)
<S>                                   <C>        <C>          <C>        <C>
Net capital assets..................  $288,477    $185,517    $243,290    $225,248
Deferred tax--asset.................  $  5,182    $ 28,233    $  3,442    $  5,537
Deferred tax--liability.............  $ 13,684    $     --    $ 13,367    $  8,737
Deficit.............................  $(17,565)   $(83,790)   $ (7,089)   $(18,406)
</TABLE>

Additionally for US reporting purposes, the preferred shares shown as
shareholders' equity in these consolidated financial statements would be shown
outside the equity section.

                                      F-15
<PAGE>
             CHIEFTAIN INTERNATIONAL, INC. AND SUBSIDIARY COMPANIES

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

                        DECEMBER 31, 1998, 1997 AND 1996

11. UNITED STATES ACCOUNTING PRINCIPLES (CONTINUED)

    (F) INCOME TAX DISCLOSURES

    Deferred tax assets (liabilities) are comprised of the following:

<TABLE>
<CAPTION>
                                                             AS AT DECEMBER 31,
                                                          ------------------------
                                                            1998           1997
                                                          ---------      ---------
                                                           (U.S. $ IN THOUSANDS)
<S>                                                       <C>            <C>
Deferred tax assets
  Depletion and amortization........................      $   6,971      $   3,413
  Financing costs...................................            390            633
  Loss carry forwards...............................         20,593         14,908
  Other.............................................            382            346
                                                          ---------      ---------
                                                             28,336         19,300

Deferred tax liabilities
  Depletion and amortization........................             --        (22,431)
  Other.............................................           (103)           (69)
                                                          ---------      ---------
                                                               (103)       (22,500)
                                                          ---------      ---------
Net deferred tax assets (liabilities)...............      $  28,233      $  (3,200)
                                                          =========      =========
</TABLE>

At December 31, 1998, the Company's US net operating tax losses carried forward
amounted to $55,218,000 of which $6,119,000, $2,835,000, $6,139,000,
$18,007,000, $3,773,000, $2,090,000 and $16,255,000 expire in the years 2005,
2007, 2009, 2010, 2011, 2012 and 2018, respectively. Canadian net operating tax
losses carried forward amounted to $2,231,000 of which $1,998,000 and $233,000
expire in the years 2003 and 2005, respectively. The Company is of the opinion
that the tax benefit of these tax losses will be realized.

Provisions for deferred income taxes are as follows:

<TABLE>
<CAPTION>
                                                      YEAR ENDED DECEMBER 31,
                                 -----------------------------------------------------------------
                                         1998                   1997                  1996
                                 ---------------------   -------------------   -------------------
                                  CANADA        US        CANADA       US       CANADA       US
                                 ---------   ---------   --------   --------   --------   --------
                                                       (U.S. $ IN THOUSANDS)
<S>                              <C>         <C>         <C>        <C>        <C>        <C>
Income (loss) before income
  taxes and dividends on
  preferred shares of a
  subsidiary...................  $  (5,002)  $ (85,440)  $  3,019   $ 17,629   $  1,962   $ 16,406
                                 =========   =========   ========   ========   ========   ========
Provision for deferred income
  taxes........................  $    (921)  $ (30,512)  $  2,122   $  6,067   $  1,239   $  5,861
                                 =========   =========   ========   ========   ========   ========
</TABLE>

                                      F-16
<PAGE>
             CHIEFTAIN INTERNATIONAL, INC. AND SUBSIDIARY COMPANIES

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

                        DECEMBER 31, 1998, 1997 AND 1996

11. UNITED STATES ACCOUNTING PRINCIPLES (CONTINUED)

The provision for income taxes differs from the amount of income tax determined
by applying the Canadian statutory rate to pre-tax income before dividends paid
on preferred shares of a subsidiary, as a result of the following:

<TABLE>
<CAPTION>
                                                   YEAR ENDED DECEMBER 31,
                                              ---------------------------------
                                                1998        1997        1996
                                              ---------   ---------   ---------
                                                    (U.S. $ IN THOUSANDS)
<S>                                           <C>         <C>         <C>
Tax at statutory Canadian rate of 44.6%.....  $ (40,355)  $   9,213   $   8,196
Lower income tax rate on earnings of
  US subsidiaries...........................      7,830      (1,617)     (1,428)
Canadian income tax on exchange loss (gain)
  which is eliminated upon consolidation....        511         362         (56)
Other.......................................        595         238         512
                                              ---------   ---------   ---------
Tax at effective rate.......................  $ (31,419)  $   8,196   $   7,224
                                              =========   =========   =========
Effective tax rate..........................       34.7%       39.7%       39.3%
                                              =========   =========   =========
</TABLE>

    (G) STOCK-BASED COMPENSATION

    The Company applies the intrinsic value method prescribed by APB Opinion 25
and related interpretations in accounting for share option transactions.
Accordingly, no compensation cost is recognized in the accounts. US accounting
principles require disclosure of the impact on earnings and earnings per share
of the value of options granted after 1994, calculated in accordance with
FAS 123. Such impact, calculated using the Black-Scholes option pricing model
and resulting in option fair values of $10.61, $11.49 and $12.54, applying
risk-free interest rates of 5.64%, 6.85% and 6.51% for options granted in 1998,
1997 and 1996, respectively, and assuming ten year expected option lives, no
dividend yields and expected volatilities of 25%, 24% and 24% on a weighted
average basis, would amount to a net of tax charge to income (loss) of
$1,502,000 (1997--$1,348,000; 1996--$872,000). After reflecting this charge, pro
forma net income (loss) applicable to common shares under US accounting
principles would be $(65,465,000), (1997--$6,162,000; 1996--$5,330,000); pro
forma net income (loss) per common share under US accounting principles would be
$(4.86) (1997--$0.45; 1996--$0.41); and pro forma fully diluted earnings (loss)
per common share under US accounting principles would be $(4.86) (1997--$0.45;
1996--$0.40). These effects are not necessarily indicative of those to be
expected in future years.

    (H) SUPPLEMENTAL CASH FLOW INFORMATION

    Net cash outflows for income taxes for the years 1998, 1997 and 1996 were
$14,000, $141,000 and $26,000, respectively. Cash outflows for long-term debt
interest were $628,000 in 1998.

                                      F-17
<PAGE>
             CHIEFTAIN INTERNATIONAL, INC. AND SUBSIDIARY COMPANIES

                      SUPPLEMENTARY FINANCIAL INFORMATION

                                  (UNAUDITED)

RESERVE INFORMATION

    Reports prepared by Netherland, Sewell & Associates, Inc., as to the
Company's US reserves, and by the Company, as to the UK reserves, estimate the
total proved and proved developed producing reserves owned by the Company,
before and after royalty deductions, as follows:

TOTAL PROVED RESERVES BEFORE ROYALTY DEDUCTIONS:

<TABLE>
<CAPTION>
                                                                                           CRUDE OIL &
                                                            NATURAL GAS--MMCF                NGLS--
                                                   ------------------------------------     BARRELS*
                                                   UNITED STATES   NORTH SEA    TOTAL     UNITED STATES
                                                   -------------   ---------   --------   -------------
<S>                                                <C>             <C>         <C>        <C>
December 31, 1996................................     127,250       23,364     150,614      10,518,800
    Purchase of producing properties.............          --           --          --              --
    Revision of previous estimates...............       7,029       (1,037)      5,992       1,317,800
    Extensions, discoveries and other
      additions..................................      21,153           --      21,153       2,046,400
    Sale of proved properties....................          --           --          --              --
    Production...................................     (24,306)      (4,010)    (28,316)       (936,300)
                                                      -------       ------     -------     -----------
December 31, 1997................................     131,126       18,317     149,443      12,946,700
    Purchase of producing properties.............       4,745           --       4,745          18,600
    Revision of previous estimates...............      10,683       (5,119)      5,564      (1,478,900)
    Extensions, discoveries and other
      additions..................................      29,360           --      29,360       4,871,800
    Sale of proved properties....................          --           --          --              --
    Production...................................     (26,960)      (3,088)    (30,048)     (1,158,100)
                                                      -------       ------     -------     -----------
December 31, 1998................................     148,954       10,110     159,064      15,200,100
                                                      =======       ======     =======     ===========
</TABLE>

TOTAL PROVED RESERVES AFTER ROYALTY DEDUCTIONS:

<TABLE>
<CAPTION>
                                                                                           CRUDE OIL &
                                                            NATURAL GAS--MMCF                NGLS--
                                                   ------------------------------------     BARRELS*
                                                   UNITED STATES   NORTH SEA    TOTAL     UNITED STATES
                                                   -------------   ---------   --------   -------------
<S>                                                <C>             <C>         <C>        <C>
December 31, 1996................................     103,437       23,364     126,801       9,252,900
    Purchase of producing properties.............          --           --          --              --
    Revision of previous estimates...............       5,136       (1,037)      4,099       1,102,800
    Extensions, discoveries and other
      additions..................................      17,628           --      17,628       1,697,600
    Sale of proved properties....................          --           --          --              --
    Production...................................     (19,421)      (4,010)    (23,431)       (799,500)
                                                      -------       ------     -------     -----------
December 31, 1997................................     106,780       18,317     125,097      11,253,800
    Purchase of producing properties.............       3,512           --       3,512          13,800
    Revision of previous estimates...............       7,819       (5,119)      2,700      (1,316,000)
    Extensions, discoveries and other
      additions..................................      22,268           --      22,268       4,142,300
    Sale of proved properties....................          --           --          --              --
    Production...................................     (21,416)      (3,088)    (24,504)       (986,800)
                                                      -------       ------     -------     -----------
December 31, 1998................................     118,963       10,110     129,073      13,107,100
                                                      =======       ======     =======     ===========
</TABLE>

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

*   26,800 (1997--58,900) barrels of natural gas liquids, before and after
    royalty deductions, associated with the UK natural gas reserves are not
    included in this table.

                                      F-18
<PAGE>
             CHIEFTAIN INTERNATIONAL, INC. AND SUBSIDIARY COMPANIES

                      SUPPLEMENTARY FINANCIAL INFORMATION

                                  (UNAUDITED)

PROVED DEVELOPED PRODUCING RESERVES BEFORE ROYALTY DEDUCTIONS:

<TABLE>
<CAPTION>
                                                      NATURAL GAS--MMCF
                                                ------------------------------   CRUDE OIL & NGLS--BARRELS
                                                 UNITED     UNITED                        UNITED
                                                 STATES    KINGDOM     TOTAL              STATES
                                                --------   --------   --------   -------------------------
<S>                                             <C>        <C>        <C>        <C>
December 31, 1996.............................   53,400     23,364     76,764             9,175,900
                                                 ======     ======     ======             =========
December 31, 1997.............................   55,013     18,317     73,330             8,209,000
                                                 ======     ======     ======             =========
December 31, 1998.............................   70,082     10,108     80,190             5,430,000
                                                 ======     ======     ======             =========
</TABLE>

PROVED DEVELOPED PRODUCING RESERVES AFTER ROYALTY DEDUCTIONS:

<TABLE>
<CAPTION>
                                                      NATURAL GAS--MMCF
                                                ------------------------------   CRUDE OIL & NGLS--BARRELS
                                                 UNITED     UNITED                        UNITED
                                                 STATES    KINGDOM     TOTAL              STATES
                                                --------   --------   --------   -------------------------
<S>                                             <C>        <C>        <C>        <C>
December 31, 1996.............................   43,000     23,364     66,364             8,138,000
                                                 ======     ======     ======             =========
December 31, 1997.............................   43,979     18,317     62,296             7,241,300
                                                 ======     ======     ======             =========
December 31, 1998.............................   55,418     10,108     65,526             4,739,000
                                                 ======     ======     ======             =========
</TABLE>

RESULTS OF OPERATIONS FOR NATURAL GAS AND OIL PRODUCING ACTIVITIES

<TABLE>
<CAPTION>
                                                                  YEAR ENDED DECEMBER 31
                                                              ------------------------------
                                                                1998       1997       1996
                                                              --------   --------   --------
                                                                   (U.S.$ IN THOUSANDS)
<S>                                                           <C>        <C>        <C>
United States
    Revenue--net of royalties...............................  $ 56,199   $ 63,227   $ 56,457
    Production costs........................................   (15,675)   (14,901)   (13,291)
    Depletion and amortization..............................   (39,460)   (33,414)   (28,976)
                                                              --------   --------   --------
    Results of operations from producing activities before
      income taxes..........................................     1,064     14,912     14,190
    Income tax expense......................................      (333)    (5,223)    (5,146)
                                                              --------   --------   --------
      Results of operations from producing activities after
        income taxes........................................  $    731   $  9,689   $  9,044
                                                              ========   ========   ========
United Kingdom
    Revenue--net of royalties...............................  $  4,411   $  6,231   $  4,155
    Production costs........................................      (964)    (1,064)      (904)
    Depletion and amortization..............................    (3,646)    (3,319)    (1,861)
                                                              --------   --------   --------
    Results of operations from producing activities before
      income taxes..........................................      (199)     1,848      1,390
    Income tax expense......................................       117       (787)      (600)
                                                              --------   --------   --------
    Results of operations from producing activities after
      income taxes..........................................  $    (82)  $  1,061   $    790
                                                              ========   ========   ========
</TABLE>

                                      F-19
<PAGE>
             CHIEFTAIN INTERNATIONAL, INC. AND SUBSIDIARY COMPANIES

                      SUPPLEMENTARY FINANCIAL INFORMATION

                                  (UNAUDITED)

<TABLE>
<CAPTION>
                                                                  YEAR ENDED DECEMBER 31
                                                              ------------------------------
                                                                1998       1997       1996
                                                              --------   --------   --------
                                                                   (U.S.$ IN THOUSANDS)
<S>                                                           <C>        <C>        <C>
Libya
    Revenue--net of royalties...............................  $  1,005   $    169   $     --
    Production costs........................................    (1,041)       (38)
    Depletion and amortization..............................    (5,144)      (131)        --
                                                              --------   --------   --------
    Results of operations from producing activities before
      income taxes..........................................    (5,180)        --         --
    Income tax expense......................................     2,312         --         --
                                                              --------   --------   --------
    Results of operations from producing activities after
      income taxes..........................................  $ (2,868)  $     --   $     --
                                                              ========   ========   ========
Total
    Revenue--net of royalties...............................  $ 61,615   $ 69,627   $ 60,612
    Production costs........................................   (17,680)   (16,003)   (14,195)
    Depletion and amortization..............................   (48,250)   (36,864)   (30,837)
                                                              --------   --------   --------
    Results of operations from producing activities before
      income taxes..........................................    (4,315)    16,760     15,580
    Income tax expense......................................     2,096     (6,010)    (5,746)
                                                              --------   --------   --------
    Results of operations from producing activities after
      income taxes..........................................  $ (2,219)  $ 10,750   $  9,834
                                                              ========   ========   ========
</TABLE>

CAPITALIZED COSTS RELATING TO NATURAL GAS AND OIL EXPLORATION AND PRODUCTION
  ACTIVITIES

<TABLE>
<CAPTION>
                                                                    AS AT DECEMBER 31,
                                                             ---------------------------------
                                                               1998        1997        1996
                                                             ---------   ---------   ---------
                                                                   (U.S.$ IN THOUSANDS)
<S>                                                          <C>         <C>         <C>
    Proved natural gas and oil properties..................  $ 475,902   $ 402,885   $ 337,538
    Unproved natural gas and oil properties................     76,478      56,922      52,816
                                                             ---------   ---------   ---------
                                                               552,380     459,807     390,354
    Accumulated depletion..................................    266,066     224,154     187,403
                                                             ---------   ---------   ---------
    Net capitalized costs..................................  $ 286,314   $ 235,653   $ 202,951
                                                             =========   =========   =========
</TABLE>

                                      F-20
<PAGE>
             CHIEFTAIN INTERNATIONAL, INC. AND SUBSIDIARY COMPANIES

                      SUPPLEMENTARY FINANCIAL INFORMATION

                                  (UNAUDITED)

COSTS INCURRED IN NATURAL GAS AND OIL PROPERTY ACQUISITION, EXPLORATION AND
  DEVELOPMENT ACTIVITIES

<TABLE>
<CAPTION>
                                                                 YEAR ENDED DECEMBER 31,
                                                              ------------------------------
                                                                1998       1997       1996
                                                              --------   --------   --------
                                                                   (U.S.$ IN THOUSANDS)
<S>                                                           <C>        <C>        <C>
Property acquisition costs:
    United States...........................................  $  7,903   $  9,164   $ 13,954
    United Kingdom..........................................       115        137        722
    Other Foreign...........................................        --         --         68
                                                              --------   --------   --------
                                                                 8,018      9,301     14,744
                                                              --------   --------   --------
Purchase of producing properties:
    United States...........................................       883         --      2,077
                                                              --------   --------   --------
Sale of producing properties:
    United States...........................................        --         --     (1,040)
                                                              --------   --------   --------
Exploration costs:
    United States...........................................    43,317     35,540     17,453
    United Kingdom..........................................        72        115         --
    Other Foreign...........................................       606      1,207        434
                                                              --------   --------   --------
                                                                43,995     36,862     17,887
                                                              --------   --------   --------
Development costs:
    United States...........................................    39,606     23,260     22,131
    United Kingdom..........................................        71         30      1,874
                                                              --------   --------   --------
                                                                39,677     23,290     24,005
                                                              --------   --------   --------
                                                              $ 92,573   $ 69,453   $ 57,673
                                                              ========   ========   ========
</TABLE>

                                      F-21
<PAGE>
             CHIEFTAIN INTERNATIONAL, INC. AND SUBSIDIARY COMPANIES

                                  (Unaudited)

STANDARDIZED MEASURE OF DISCOUNTED FUTURE NET CASH FLOWS AND CHANGES THEREIN
  RELATING TO PROVED OIL, NATURAL GAS LIQUIDS AND NATURAL GAS RESERVES

    The following standardized measure of discounted future net cash flow was
computed in accordance with Financial Accounting Standards Board Statement #69
using year-end prices and costs, and year-end statutory tax rates. Royalty
deductions were based on laws, regulations and contracts existing at the end of
each period. No values are given to unproved properties or to probable reserves
that may be recovered from proved properties.

The inexactness associated with estimating reserve quantities, future production
streams and future development and production expenditures, together with the
assumptions applied in valuing future production, substantially diminish the
reliability of this data. The values so derived are not considered to be
estimates of fair market value. THE COMPANY THEREFORE CAUTIONS AGAINST
SIMPLISTIC USE OF THIS INFORMATION.

<TABLE>
<CAPTION>
                                                                   YEAR ENDED DECEMBER 31,
                                                              ---------------------------------
                                                                1998        1997        1996
                                                              ---------   ---------   ---------
                                                                    (U.S. $ IN THOUSANDS)
<S>                                                           <C>         <C>         <C>
United States
  Future cash inflows.......................................  $ 382,771   $ 480,669   $ 577,313
  Future production costs...................................   (116,976)   (121,380)   (148,061)
  Future development costs..................................    (60,203)    (57,208)    (39,375)
  Future income tax expense.................................         --     (46,742)    (85,464)
                                                              ---------   ---------   ---------
  Future net cash flows.....................................    205,592     255,339     304,413
  Ten percent annual discount for estimated timing of cash
    flows...................................................    (62,089)    (70,844)    (89,292)
                                                              ---------   ---------   ---------
  Standardized measure of discounted future net cash
    flows...................................................    143,503     184,495     215,121
                                                              ---------   ---------   ---------
United Kingdom
  Future cash inflows.......................................     19,349      32,774      48,392
  Future production costs...................................     (7,483)     (5,734)     (8,045)
  Future development costs..................................     (1,457)     (1,450)     (1,603)
  Future income tax expense.................................         --      (6,340)     (6,601)
                                                              ---------   ---------   ---------
  Future net cash flows.....................................     10,409      19,250      32,143
  Ten percent annual discount for estimated timing of cash
    flows...................................................     (1,404)     (4,172)     (8,241)
                                                              ---------   ---------   ---------
  Standardized measure of discounted future net cash
    flows...................................................      9,005      15,078      23,902
                                                              ---------   ---------   ---------
Total
  Future cash inflows.......................................    402,120     513,443     625,705
  Future production costs...................................   (124,459)   (127,114)   (156,106)
  Future development costs..................................    (61,660)    (58,658)    (40,978)
  Future income tax expense.................................         --     (53,082)    (92,065)
                                                              ---------   ---------   ---------
  Future net cash flows.....................................    216,001     274,589     336,556
  Ten percent annual discount for estimated timing of cash
    flows...................................................    (63,493)    (75,016)    (97,533)
                                                              ---------   ---------   ---------
  Standardized measure of discounted future net cash
    flows...................................................  $ 152,508   $ 199,573   $ 239,023
                                                              =========   =========   =========
</TABLE>

                                      F-22
<PAGE>
       CHIEFTAIN INTERNATIONAL, INC. AND SUBSIDIARY COMPANIES (CONTINUED)

                                  (UNAUDITED)

The following table sets out principal sources of change in the standardized
measure of discounted future net cash flows during the respective periods.

<TABLE>
<CAPTION>
                                                                   YEAR ENDED DECEMBER 31,
                                                              ---------------------------------
                                                                1998        1997        1996
                                                              ---------   ---------   ---------
                                                                    (U.S. $ IN THOUSANDS)
<S>                                                           <C>         <C>         <C>
Sales of oil, ngls and natural gas produced, net of
  production costs..........................................  $ (45,231)  $ (56,061)  $ (48,233)
Net change in prices and production costs...................    (79,471)    (73,047)    120,858
Extensions and discoveries, less related costs..............     30,159      28,219      50,995
Purchase of producing properties............................      2,793          --      10,638
Sales of producing properties...............................         --          --        (436)
Development costs incurred during the period................     23,131      10,096      15,026
Revisions of previous quantity estimates....................    (17,191)     22,388      (4,462)
Accretion of discount.......................................     19,958      23,902      15,457
Net change in income taxes..................................     38,739      26,534     (51,064)
Changes in estimated future development costs...............    (16,421)    (12,551)    (13,950)
Other.......................................................     (3,531)     (8,930)      6,700
                                                              ---------   ---------   ---------
Net increase (decrease).....................................    (47,065)    (39,450)    101,529
Beginning of year...........................................    199,573     239,023     137,494
                                                              ---------   ---------   ---------
End of year.................................................  $ 152,508   $ 199,573   $ 239,023
                                                              =========   =========   =========
</TABLE>

QUARTERLY FINANCIAL INFORMATION

<TABLE>
<CAPTION>
                                                                   GROSS         INCOME       PER COMMON
QUARTER ENDED                                       REVENUE        PROFIT        (LOSS)         SHARE
- -------------                                       --------      --------      --------      ----------
                                                      (U.S. $ IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)
<S>                                                 <C>           <C>           <C>           <C>
March 31, 1998................................      $ 18,718      $  2,884      $    556       $  0.04
June 30, 1998.................................        14,804          (342)       (1,735)        (0.13)
September 30, 1998............................        13,943        (1,345)       (2,472)        (0.18)
December 31, 1998.............................        16,926        (6,719)       (5,404)        (0.40)

March 31, 1997................................      $ 22,563      $  8,444      $  3,924       $  0.29
June 30, 1997.................................        14,807         1,271          (470)        (0.04)
September 30, 1997............................        14,891         1,949            36          0.01
December 31, 1997.............................        19,794         5,807         1,728          0.12
</TABLE>

                                      F-23
<PAGE>
             CHIEFTAIN INTERNATIONAL, INC. AND SUBSIDIARY COMPANIES

                      CONSOLIDATED CONDENSED BALANCE SHEET

                             (U.S. $ IN THOUSANDS)

(Full Cost Method of Accounting)

<TABLE>
<CAPTION>
                                                              SEPTEMBER 30,   DECEMBER 31,
                                                                  1999            1998
                                                              -------------   ------------
                                                               (UNAUDITED)
<S>                                                           <C>             <C>
ASSETS

Current assets:
  Cash and short-term deposits..............................    $     597       $  10,613
  Accounts receivable.......................................       20,111          14,030
  Other.....................................................          792             282
                                                                ---------       ---------
                                                                   21,500          24,925

Capital assets--net.........................................      275,471         288,477

Deferred income taxes.......................................       10,892           5,182
                                                                ---------       ---------
                                                                $ 307,863       $ 318,584
                                                                =========       =========

LIABILITIES AND SHAREHOLDERS' EQUITY

Current liabilities:
  Accounts payable and accrued..............................    $  16,791       $  22,533

Long-term debt..............................................       45,000          40,000

Abandonment cost accrual....................................        8,305           7,421

Deferred income taxes.......................................       13,978          13,684

Shareholders' equity:
  Preferred shares of a subsidiary..........................       63,403          63,403
  Common shares.............................................      189,010         189,108
  Contributed surplus.......................................           26              --
  Deficit...................................................      (28,650)        (17,565)
                                                                ---------       ---------
                                                                  223,789         234,946
                                                                ---------       ---------
                                                                $ 307,863       $ 318,584
                                                                =========       =========
</TABLE>

         See Notes to the Consolidated Condensed Financial Statements.

                                      F-24
<PAGE>
             CHIEFTAIN INTERNATIONAL, INC. AND SUBSIDIARY COMPANIES

               CONSOLIDATED CONDENSED STATEMENT OF INCOME (LOSS)

           (U.S. $ IN THOUSANDS EXCEPT SHARES AND PER SHARE AMOUNTS)

                                  (UNAUDITED)

<TABLE>
<CAPTION>
                                                         PERIOD ENDED SEPTEMBER 30,
                                            -----------------------------------------------------
                                                   NINE MONTHS                THREE MONTHS
                                            -------------------------   -------------------------
                                               1999          1998          1999          1998
                                            -----------   -----------   -----------   -----------
<S>                                         <C>           <C>           <C>           <C>
Production revenue, net of royalties......  $    52,954   $    44,852   $    22,569   $    13,822
Interest and other revenue (Note 2).......          570         2,613           194           121
                                            -----------   -----------   -----------   -----------
                                                 53,524        47,465        22,763        13,943

Production costs..........................       10,985        12,219         3,623         4,206
General and administrative expenses.......        3,354         3,668           981           917
Interest..................................        1,867           285           666           260
Depletion and amortization................       38,711        30,096        13,619         9,905
Additional depletion: Libyan properties
  (Note 3)................................       11,393            --            --            --
                                            -----------   -----------   -----------   -----------
                                                 66,310        46,268        18,889        15,288
                                            -----------   -----------   -----------   -----------
Income (loss) before income taxes and
  dividends on a preferred shares of a
  subsidiary..............................      (12,786)        1,197         3,874        (1,345)
Income taxes (Note 4).....................       (5,408)        1,141         1,356          (109)
                                            -----------   -----------   -----------   -----------
Income (loss) before dividends on
  preferred shares of a subsidiary........       (7,378)           56         2,518        (1,236)
Dividends on preferred shares of
  a subsidiary............................        3,707         3,707         1,236         1,236
                                            -----------   -----------   -----------   -----------
Net income (loss) applicable to
  common shares...........................  $   (11,085)  $    (3,651)  $     1,282   $    (2,472)
                                            ===========   ===========   ===========   ===========
Net income (loss) per common share
  (Note 5):
    --Basic...............................  $     (0.83)  $     (0.27)  $      0.10   $     (0.18)
                                            ===========   ===========   ===========   ===========
    --Fully diluted.......................  $     (0.83)  $     (0.27)  $      0.10   $     (0.18)
                                            ===========   ===========   ===========   ===========
Weighted average number of common shares
  outstanding:
    --Basic...............................   13,350,383    13,520,786    13,348,645    13,438,005
                                            ===========   ===========   ===========   ===========
    --Fully diluted.......................   13,350,383    13,520,786    13,348,645    13,438,005
                                            ===========   ===========   ===========   ===========
</TABLE>

           See Notes to Consolidated Condensed Financial Statements.

                                      F-25
<PAGE>
             CHIEFTAIN INTERNATIONAL, INC. AND SUBSIDIARY COMPANIES

                      CONSOLIDATED CONDENSED STATEMENT OF
                                   CASH FLOWS

                             (U.S. $ IN THOUSANDS)

                                  (UNAUDITED)

<TABLE>
<CAPTION>
                                                              NINE MONTHS ENDED SEPTEMBER 30,
                                                              -------------------------------
                                                                   1999             1998
                                                              --------------   --------------
<S>                                                           <C>              <C>
Operating activities:
  Net income (loss) applicable to common shares.............    $ (11,085)       $  (3,651)
  Items not requiring a current cash outlay.................       44,688           31,210
                                                                ---------        ---------
                                                                   33,603           27,559
  Net change in non-cash operating working capital (Note
    6)......................................................       (6,358)            (713)
                                                                ---------        ---------
                                                                   27,245           26,846
Financing activities:
  Increase in long-term debt................................        5,000           25,000
  Purchase of common shares for cancellation................          (80)          (5,355)
  Issue of common shares....................................            9              437
                                                                ---------        ---------
                                                                    4,929           20,082
Investing activities:
  Lease acquisition, exploration and drilling costs.........      (30,270)         (55,847)
  Pipelines and production equipment acquired...............       (6,072)         (10,351)
  Sale of producing properties..............................          155               --
                                                                ---------        ---------
                                                                  (36,187)         (66,198)
  Purchase of other capital assets..........................          (28)             (87)
  Change in investing accounts payable and accrued..........       (5,975)          (1,465)
                                                                ---------        ---------
                                                                  (42,190)         (67,750)
                                                                ---------        ---------
  Change in cash and short-term deposits....................      (10,016)         (20,822)
  Beginning cash and short-term deposits....................       10,613           26,925
                                                                ---------        ---------
  Ending cash and short-term deposits.......................    $     597        $   6,103
                                                                =========        =========
</TABLE>

           See Notes to Consolidated Condensed Financial Statements.

                                      F-26
<PAGE>
             CHIEFTAIN INTERNATIONAL, INC. AND SUBSIDIARY COMPANIES

              NOTES TO CONSOLIDATED CONDENSED FINANCIAL STATEMENTS

                          SEPTEMBER 30, 1998 AND 1999

                                  (UNAUDITED)

1.  BASIS OF PRESENTATION

    In the opinion of Chieftain International, Inc. (the "Company" and together
with its subsidiaries "Chieftain"), the accompanying unaudited consolidated
condensed financial statements contain all adjustments (consisting of only
normal recurring accruals) necessary to present fairly the financial position as
at September 30, 1999 and December 31, 1998 and the results of operations and
cash flows for the nine month periods ended September 30, 1999 and 1998. Certain
information and notes normally included in Chieftain's financial statements
prepared in conformity with Canadian generally accepted accounting principles
have been condensed or omitted pursuant to the rules and regulations of the
Securities and Exchange Commission. These consolidated condensed financial
statements should be read in conjunction with the audited consolidated financial
statements and the notes thereto included in Chieftain's Annual Report on
Form 10-K for the year ended December 31, 1998.

Preparation of financial statements in conformity with generally accepted
accounting principles requires management to make informed judgements and
estimates. Actual results may differ from those estimates.

The results of operations and cash flows for the nine month period ended
September 30, 1999 are not necessarily indicative of the results to be expected
for the full year.

Material differences between Canadian and US accounting principles that affect
Chieftain are referred to in Note 7, which provides the effects of such
differences on earnings and balance sheet accounts.

2.  INTEREST AND OTHER REVENUE

    Interest and other revenue for the first quarter of 1998 included
$1.6 million awarded by the courts pursuant to a successful claim for recovery
of excess transportation charges incurred from 1990 through 1997. The award
comprises transportation charges, legal fees and judgment interest in the
amounts of $1,129,000, $282,000 and $189,000, respectively.

3.  ADDITIONAL DEPLETION

    Additional depletion of $11.4 million arises from the termination of an
exploration program and production test in Libya.

                                      F-27
<PAGE>
             CHIEFTAIN INTERNATIONAL, INC. AND SUBSIDIARY COMPANIES

        NOTES TO CONSOLIDATED CONDENSED FINANCIAL STATEMENTS (CONTINUED)

                          SEPTEMBER 30, 1998 AND 1999

                                  (UNAUDITED)

4.  INCOME TAXES

    The provision for income taxes differs from the amount of income tax
determined by applying the Canadian statutory rate to pre-tax income (loss)
before dividends paid on preferred shares of a subsidiary as a result of the
following:

<TABLE>
<CAPTION>
                                        NINE MONTHS ENDED    THREE MONTHS ENDED
                                          SEPTEMBER 30,         SEPTEMBER 30,
                                       -------------------   -------------------
                                         1999       1998       1999       1998
                                       --------   --------   --------   --------
                                                 (U.S.$ IN THOUSANDS)
<S>                                    <C>        <C>        <C>        <C>
Tax at statutory Canadian rate
  44.62%.............................  $ (5,705)  $    534   $  1,729   $   (603)
Lower income tax rate on earnings of
  US subsidiaries....................       (76)      (144)      (407)        95
Canadian income tax on exchange loss
  (gain) which is eliminated upon
  consolidation......................       634        220         41         47
Prior years' tax reassessments.......        --        208         --        208
Exchange revaluation of Canadian
  deferred tax assets................      (289)       222         (9)       105
Other................................        28        101          2         39
                                       --------   --------   --------   --------
Tax at effective rate................  $ (5,408)  $  1,141   $  1,356   $   (109)
                                       ========   ========   ========   ========
Effective tax rate...................      42.3%      95.3%      35.0%       8.1%
                                       ========   ========   ========   ========
</TABLE>

5.  PER SHARE AMOUNTS

    Net income (loss) per common share is computed by dividing net income (loss)
applicable to common shares by the weighted average number of common shares
outstanding during the period.

In the calculation of fully diluted earnings per share, shares outstanding are
adjusted for share options and shares issuable on conversion of preferred shares
were dilutive. Earnings are adjusted by the amount of imputed interest on share
option proceeds and preferred share dividends.

6.  SUPPLEMENTAL CASH FLOW INFORMATION

    Cash outflows for (inflows from) income taxes during the 1999 third quarter
were $(29,000) (year-to-date--$(12,000)) (1998--third quarter--$14,000;
year-to-date--$41,000). Cash outflows for long-term debt interest during the
1999 third quarter were $653,000 (year-to-date--$1,804,000) (1988--
third-quarter--$156,000; year-to-date--$156,000).

                                      F-28
<PAGE>
             CHIEFTAIN INTERNATIONAL, INC. AND SUBSIDIARY COMPANIES

        NOTES TO CONSOLIDATED CONDENSED FINANCIAL STATEMENTS (CONTINUED)

                          SEPTEMBER 30, 1998 AND 1999

                                  (UNAUDITED)

7.  UNITED STATES ACCOUNTING PRINCIPLES

    (A) FULL COST ACCOUNTING

US full cost accounting rules differ materially from the Canadian full cost
accounting guidelines followed by Chieftain. The US rules require an impairment
test to be conducted quarterly whereas the Canadian guidelines require this test
only at year-end. In determining the limitation on carrying values, US rules
require the discounting of future net revenues at 10%, and Canadian guidelines
require the use of undiscounted future net revenues and the deduction of
estimated future administrative and financing costs. The quarterly test required
by US accounting rules, using a March 31, 1999 UK natural gas price of $0.84 per
mcf to determine future net revenues, would have resulted in a write-down of UK
property carrying costs at March 31, 1999 of $7.1 million and, after providing
for tax recoveries of $3.1 million, a net charge to operations of $4.0 million.
Using June 30, 1998 US gas and oil prices of $2.09 per mcf and $12.40 per barrel
to determine future net revenues would have resulted in a write-down of US
property carrying costs at June 30, 1998 of $24.7 million and, after providing
for tax recoveries of $8.6 million, a net charge to operations of
$16.1 million.

    (B) EFFECT ON EARNINGS

The effect on consolidated earnings of these differences is summarized as
follows:

<TABLE>
<CAPTION>
                                                           NINE MONTHS ENDED
                                                             SEPTEMBER 30,
                                                  -----------------------------------
                                                       1999                 1998
                                                  --------------       --------------
                                                  (U.S. $ IN THOUSANDS, EXCEPT SHARES
                                                        AND PER SHARE AMOUNTS)
<S>                                               <C>                  <C>
Net income (loss) applicable to common shares as
  reported......................................   $   (11,085)         $    (3,651)
Additional depletion............................        (7,104)             (24,725)
                                                   -----------          -----------
                                                       (18,189)             (28,376)
Add reduction in depletion expense..............        13,122                2,631
Decrease (increase) in deferred tax provision...        (1,656)               7,449
                                                   -----------          -----------
Net income (loss) applicable to common shares
  under US accounting principles................   $    (6,723)         $   (18,296)
                                                   ===========          ===========
Net income (loss) per common share under
  US accounting principles:
      --Basic...................................   $     (0.50)         $     (1.35)
                                                   ===========          ===========
      --Fully diluted...........................   $     (0.50)         $     (1.35)
                                                   ===========          ===========
Fully diluted number of common shares
  outstanding...................................    13,350,383           13,520,786
                                                   ===========          ===========
</TABLE>

                                      F-29
<PAGE>
             CHIEFTAIN INTERNATIONAL, INC. AND SUBSIDIARY COMPANIES

        NOTES TO CONSOLIDATED CONDENSED FINANCIAL STATEMENTS (CONTINUED)

                          SEPTEMBER 30, 1998 AND 1999

                                  (UNAUDITED)

<TABLE>
<CAPTION>
                                                          THREE MONTHS ENDED
                                                             SEPTEMBER 30
                                                  -----------------------------------
                                                       1999                 1998
                                                  --------------       --------------
                                                  (U.S. $ IN THOUSANDS, EXCEPT SHARES
                                                        AND PER SHARE AMOUNTS)
<S>                                               <C>                  <C>
Net income (loss) applicable to common shares as
  reported......................................   $     1,282          $    (2,472)
                                                   -----------          -----------
Add reduction in depletion expense..............         4,926                1,212
Decrease (increase) in deferred tax provision...        (1,830)                (708)
                                                   -----------          -----------
Net income (loss) applicable to common shares
  under US accounting principles................   $     4,378          $    (1,968)
                                                   ===========          ===========
Net income (loss) per common share under
  US accounting principles:
      --Basic...................................   $      0.33          $     (0.15)
                                                   ===========          ===========
      --Fully diluted...........................   $      0.32          $     (0.15)
                                                   ===========          ===========
Fully diluted number of common shares
  outstanding...................................    13,493,458           13,438,005
                                                   ===========          ===========
</TABLE>

    (C) EFFECT ON BALANCE SHEET

The effect on the Consolidated Condensed Balance Sheet of the differences
between Canadian and US accounting principles is as follows:

<TABLE>
<CAPTION>
                                         AS AT                     AS AT
                                  SEPTEMBER 30, 1999         DECEMBER 31, 1998
                                -----------------------   -----------------------
                                              UNDER US                  UNDER US
                                    AS       ACCOUNTING       AS       ACCOUNTING
                                 REPORTED    PRINCIPLES    REPORTED    PRINCIPLES
                                ----------   ----------   ----------   ----------
                                              (U.S.$ IN THOUSANDS)
<S>                             <C>          <C>          <C>          <C>
Net capital assets............  $  275,471   $  178,529   $  288,477   $  185,517
Deferred tax--asset...........  $   10,892   $   31,993   $    5,182   $   28,233
Deferred tax--liability.......  $   13,978   $       --   $   13,684   $       --
Deficit.......................  $  (28,650)  $  (90,513)  $  (17,565)  $  (83,790)
</TABLE>

Additionally for U.S. reporting purposes, the preferred shares shown as
shareholders' equity in these consolidated condensed financial statements would
be shown outside the equity section.

                                      F-30
<PAGE>
             CHIEFTAIN INTERNATIONAL, INC. AND SUBSIDIARY COMPANIES

        NOTES TO CONSOLIDATED CONDENSED FINANCIAL STATEMENTS (CONTINUED)

                          SEPTEMBER 30, 1998 AND 1999

                                  (UNAUDITED)

    (D) STOCK-BASED COMPENSATION

The Company applies the intrinsic value method prescribed by APB Opinion 25 and
related interpretations in accounting for share option transactions.
Accordingly, no compensation cost is recognized in the accounts. US accounting
principles require disclosure of the impact on earnings and earnings per share
of the value of options granted after 1994, calculated in accordance with
FAS 123. For the nine months ended September 30, 1999 such impact would amount
to a net of tax charge to income (loss) of $946,000 (1998--$1,270,000) and for
the three months ended September 30, such impact would amount to a net of tax
charge to income (loss) of $355,000 (1998--$397,000). Under US accounting
principles after reflecting this charge, for the nine months ended
September 30, pro forma net income (loss) applicable to common shares would be
$(7,669,000) (1998--($19,566,000)); net income (loss) per common share would be
$(0.57) (1998--$(1.45)); and pro forma fully diluted earnings (loss) per common
share would be $(0.57) (1998--$(1.45)). For the three months ended
September 30, pro forma net income (loss) applicable to common shares under US
accounting principles would be $4,023,000 (1998--$(2,365,000)); pro forma net
income (loss) per common share would be $0.30 (1998--$(0.18)); and pro forma
fully diluted earnings (loss) per common share would be $0.30 (1998--$(0.18)).
These effects are not necessarily indicative of those to be expected in future
periods.

                                      F-31
<PAGE>
PROSPECTUS

                                  $300,000,000

                                     [LOGO]

                         CHIEFTAIN INTERNATIONAL, INC.

                        COMMON SHARES, PREFERRED SHARES,
                          DEBT SECURITIES AND WARRANTS

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

We will offer and sell from time to time Chieftain common shares, preferred
shares, debt securities, or warrants. We will provide specific terms of these
securities in supplements to this prospectus. The terms of the securities will
include the initial offering price, aggregate amount of the offering, listing on
any securities exchange or quotation system, risk factors and the agents,
dealers or underwriters, if any, to be used in connection with the sale of these
securities. You should read this prospectus and any supplement together with any
and all documents incorporated by reference herein and in any supplement
carefully before you invest.

Our common shares are listed on the American Stock Exchange and The Toronto
Stock Exchange under the symbol "CID."

INVESTING IN OUR SECURITIES INVOLVES RISKS. SEE "RISK FACTORS" ON PAGE 6.

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

NEITHER THE SECURITIES AND EXCHANGE COMMISSION NOR ANY STATE SECURITIES
COMMISSION HAS APPROVED OR DISAPPROVED OF THESE SECURITIES, OR DETERMINED IF
THIS PROSPECTUS IS TRUTHFUL OR COMPLETE. ANY REPRESENTATION TO THE CONTRARY IS A
CRIMINAL OFFENSE.

                THE DATE OF THIS PROSPECTUS IS OCTOBER 20, 1999.
<PAGE>
                               TABLE OF CONTENTS

<TABLE>
<CAPTION>
                                                                PAGE
                                                              ---------
<S>                                                           <C>
About This Prospectus.......................................      3

Enforcement of Civil Liabilities............................      3

Where You Can Find More Information.........................      3

Forward-Looking Statements..................................      4

Chieftain...................................................      5

Risk Factors................................................      6

Ratios of Earnings to Fixed Charges.........................      8

Use of Proceeds.............................................      9

Description of Share Capital................................      9

Description of Debt Securities..............................     14

Description of Warrants.....................................     19

Plan of Distribution........................................     21

Legal Matters...............................................     22

Experts.....................................................     22
</TABLE>

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

YOU SHOULD RELY ONLY ON THE INFORMATION WE HAVE INCLUDED OR INCORPORATED BY
REFERENCE IN THIS PROSPECTUS. WE HAVE NOT AUTHORIZED ANYONE TO PROVIDE YOU WITH
ADDITIONAL OR DIFFERENT INFORMATION. IF YOU RECEIVE ANY UNAUTHORIZED
INFORMATION, YOU MUST NOT RELY ON IT. WE ARE OFFERING TO SELL THE SECURITIES
ONLY IN JURISDICTIONS WHERE SALES ARE PERMITTED. YOU SHOULD NOT ASSUME THAT THE
INFORMATION WE HAVE INCLUDED IN THIS PROSPECTUS IS ACCURATE AS OF ANY DATE OTHER
THAN THE DATE OF THIS PROSPECTUS OR THAT ANY INFORMATION WE HAVE INCORPORATED BY
REFERENCE IS ACCURATE AS OF ANY DATE OTHER THAN THE DATE OF THE DOCUMENT
INCORPORATED BY REFERENCE.

                                       2
<PAGE>
                             ABOUT THIS PROSPECTUS

This prospectus is part of a registration statement that we filed with the SEC
using a "shelf" registration process. Under the shelf registration process, we
may sell any combination of the securities described in this prospectus in one
or more offerings up to a total dollar amount of $300,000,000. This prospectus
provides you with a general description of the securities we may offer. Each
time we sell securities, we will provide a prospectus supplement that will
contain specific information about the terms of that offering. The prospectus
supplement may also add, update or change information contained in this
prospectus. You should read both this prospectus and any prospectus supplement,
together with additional information described under the heading "Where You Can
Find More Information."

As used in this prospectus, "Chieftain," "we," "us" and "our" refer to Chieftain
International, Inc., a company organized under the laws of the Province of
Alberta, Canada, and its subsidiaries.

                        ENFORCEMENT OF CIVIL LIABILITIES

We are a corporation organized in Canada under the Business Corporations Act
(Alberta). Most of our directors and officers are not residents of the United
States, and all or a substantial portion of the assets of our directors and
officers are located outside of the United States. As a result, it may be
difficult for holders of our securities to effect service of process within the
United States upon those directors and officers who do not reside in the U.S. or
to enforce against them in the U.S. courts judgments obtained in U.S. courts
predicated upon the civil liability provisions under U.S. federal securities
laws. We have been advised by our Canadian counsel, Bennett Jones, that there is
doubt as to whether, in original actions or actions for enforcement of judgments
of U.S. courts, liabilities predicated solely upon U.S. federal securities laws
are enforceable in Canada against us or any of our directors or officers or the
experts named herein, who are not residents of the United States.

                      WHERE YOU CAN FIND MORE INFORMATION

We are subject to the informational requirements of the Securities Exchange Act
of 1934, which requires us to file annual, quarterly and special reports, proxy
statements and other information with the SEC. You may read and copy any
document that we file at the Public Reference Room of the SEC at 450 Fifth
Street, N.W., Washington, D.C. 20549. Please call the SEC at 1-800-SEC-0330 for
further information on the operation of its public reference room. You may also
inspect our filings at the regional offices of the SEC located at Citicorp
Center, 500 West Madison Street, Suite 1400, Chicago, Illinois 60661 and 7 World
Trade Center, New York, New York 10048 or over the Internet at the SEC's web
site at http://www.sec.gov.

This prospectus constitutes part of a registration statement on Form S-3 filed
with the SEC under the Securities Act of 1933. It omits some of the information
contained in the registration statement, and reference is made to the
registration statement for further information with respect to us and the
securities we are offering. Any statement contained in this prospectus
concerning the provisions of any document filed as an exhibit to the
registration statement or otherwise filed with the SEC is not necessarily
complete, and in each instance reference is made to the copy of the filed
document.

The SEC allows us to "incorporate by reference" the information we file with
them, which means that we can disclose important information to you by referring
you to those documents. The information incorporated by reference is considered
to be part of this prospectus, and later information that we file with the SEC
will automatically update and supersede this information and the information in
the

                                       3
<PAGE>
prospectus. We incorporate by reference the documents listed below and any
future filings made with the SEC under Sections 13(a), 13(c), 14 or 15(d) of the
Securities Act of 1934:

1.  Our Annual Report on Form 10-K for the year ended December 31, 1998.

2.  Our Proxy Statement dated March 11, 1999 filed with the SEC on April 7,
    1999.

3.  Our Quarterly Reports on Form 10-Q for the fiscal quarters ended March 31,
    June 30 and September 30, 1999.

4.  The description of our common shares contained in our registration statement
    on Form 8-A, dated April 7, 1989, as amended on April 12, 1989, and any
    subsequent amendment or report filed before or after the date of this
    prospectus for the purpose of updating the description.

5.  The description of our Shareholder Rights Plan Agreement contained in our
    registration statement on Form 8-A, dated October 20, 1999, and any
    subsequent amendment or report filed on or after the date of this prospectus
    for the purpose of updating the description.

You may request a copy of these filings at no cost, by writing or telephoning
Esther S. Ondrack, Senior Vice President and Secretary, Chieftain
International, Inc., 1201 TD Tower, 10088 - 102 Avenue, Edmonton, Alberta,
Canada T5J 2Z1, telephone number (780) 425-1950.

                           FORWARD-LOOKING STATEMENTS

Some of the information included in this prospectus and in the documents we have
incorporated by reference contains, and any prospectus supplement may contain,
forward-looking statements. Forward-looking statements use forward-looking terms
such as "believe," "may," "intend," "will," "project," "budget," "should" or
"anticipate" or other similar words. These statements discuss "forward-looking"
information such as:

 - anticipated capital expenditures and budgets;

 - future cash flows and borrowings; and

 - pursuit of potential future acquisition or drilling opportunities.

These forward-looking statements are based on assumptions that we believe are
reasonable, but they are open to a wide range of uncertainties and business
risks, including the following:

 - fluctuations of the prices received or demand for oil and natural gas;

 - uncertainty of drilling results, reserve estimates and reserve replacement;

 - operating hazards;

 - acquisition risks;

 - unexpected substantial variances in capital requirements;

 - environmental matters;

 - Year 2000 computer-related interruptions; and

 - general economic conditions.

Other factors that could cause actual results to differ materially from those
anticipated are discussed in our periodic filings with the SEC.

When considering these forward-looking statements, you should keep in mind the
risk factors and other cautionary statements in this prospectus, in any
prospectus supplement and in the documents we have

                                       4
<PAGE>
incorporated by reference. We will not update these forward-looking statements
unless the securities laws require us to do so.

                                   CHIEFTAIN

Chieftain International, Inc. is an independent energy company engaged in the
exploration, development and production of natural gas and oil. Our producing
properties and exploration acreage are primarily located in the shallow waters
of the U.S. Gulf of Mexico. We also have properties located onshore in
Louisiana, in the Four Corners area of southeast Utah and the U.K. sector of the
North Sea.

We have assembled a large natural gas and oil lease acreage position in the Gulf
of Mexico. Our lease interests in the Gulf of Mexico include a balanced
portfolio of exploration and development drilling prospects. These prospects
range from high-impact prospects with relatively greater risks, which we believe
have the potential to add substantially to our reserves, to relatively lower
risk development and exploitation projects with lower reserve potential. Our
exploration efforts are supported by an extensive 3-D seismic database covering
most of our leases. We believe that our seismic database and related
technological expertise have contributed to our successful exploration and
development track record. We believe our conservative capital structure provides
us with the financial flexibility to take advantage of our prospects and other
opportunities, including acquisitions of leasehold acreage and producing
properties.

                                       5
<PAGE>
                                  RISK FACTORS

An investment in our securities involves significant risks. You should carefully
consider the following risk factors before you decide to buy any of our
securities. You should also carefully read and consider all of the information
we have included, or incorporated by reference, in this prospectus before you
decide to buy any of our securities.

IF WE CANNOT REPLACE OUR RESERVES, OUR PRODUCTION AND FINANCIAL CONDITION WILL
SUFFER.

Unless we successfully replace our reserves, our production will decline,
resulting in lower revenues and cash flow. Replacing our reserves is
particularly important because most of our reserves are in the Gulf of Mexico
where wells normally have steeper rates of decline than onshore wells. Reduced
reserves may also make borrowing and raising equity more difficult. In response
to lower oil and natural gas prices, our capital expenditures in 1999 are
expected to be $55 million, compared to $92.6 million in 1998. At this level of
capital expenditures, it is more difficult to replace our reserves. Furthermore,
for the reasons discussed below, even if capital is spent on drilling or to make
acquisitions, such efforts have a risk of being unsuccessful.

DRILLING WELLS IS SPECULATIVE AND CAPITAL INTENSIVE.

Exploring for oil and natural gas and developing oil and natural gas properties
require significant capital expenditures and involve a high degree of financial
risk. The budgeted costs of drilling, completing and operating wells are often
exceeded and can increase significantly when drilling costs rise and supply
tightens. Drilling may be unsuccessful for many reasons, including weather, cost
overruns, equipment shortages and mechanical difficulties. Moreover, the
successful drilling of an oil or gas well does not ensure a profit on
investment. Exploratory wells bear a much greater risk of loss than development
wells. A variety of factors, both geological and market-related, can cause a
well to become uneconomic or only marginally economic. In addition to their
costs, unsuccessful wells can hurt our efforts to replace reserves.

RESERVES ON PROPERTIES WE BUY MAY NOT MEET OUR EXPECTATIONS AND COULD CHANGE THE
NATURE OF OUR BUSINESS.

Property acquisition decisions are based on various assumptions and subjective
judgments that are speculative. Although available geological and geophysical
information can provide information about the potential of a property, it is
impossible to predict accurately a property's production and profitability.

In addition, we may have difficulty integrating future acquisitions into our
operations, and they may not achieve our desired profitability objectives.
Likewise, as is customary in the industry, we generally acquire oil and gas
acreage without any warranty of title except through the transferor. In some
instances, title opinions are not obtained if, in our judgment, it would be
uneconomical or impractical to do so. Losses may result from title defects or
from defects in the assignment of leasehold rights. While our current operations
are primarily in shallow waters of the U.S. Gulf of Mexico (offshore Texas and
Louisiana), we may pursue acquisitions or properties located in other geographic
areas, which would decrease our geographical concentration.

ESTIMATES OF OUR PROVED RESERVES ARE UNCERTAIN AND OUR REVENUES FROM PRODUCTION
MAY VARY SIGNIFICANTLY FROM ESTIMATED AMOUNTS.

The quantities and values of our proved reserves included in this prospectus are
only estimates and are subject to numerous uncertainties. Estimates by other
engineers might differ materially. The accuracy of any reserve estimate is a
function of the quality of available data and of engineering and geological

                                       6
<PAGE>
interpretation. These estimates depend on assumptions regarding quantities and
production rates of recoverable oil and natural gas reserves, future prices for
oil and natural gas, timing and amounts of development expenditures and
operating expenses, all of which will vary from those assumed in our estimates.
These variances may be significant.

Any significant variance from the assumptions used could result in the actual
amounts of oil and natural gas ultimately recovered and future net cash flows
being materially different from the estimates in our reserve reports. In
addition, results of drilling, testing, production and changes in prices after
the date of the estimate may result in substantial downward revisions. These
estimates may not accurately predict the present value of net cash flows from
oil and natural gas reserves.

At December 31, 1998, approximately 30% of our estimated proved reserves were
undeveloped. Recovery of undeveloped reserves generally requires additional
capital expenditures and successful drilling operations. The reserve data
assumes that we can and will make these expenditures and conduct these
operations successfully, which may not occur.

WE DO NOT INSURE AGAINST ALL POTENTIAL LOSSES AND COULD BE SERIOUSLY HARMED BY
UNEXPECTED LIABILITIES.

Exploration for and production of oil and natural gas can be hazardous,
involving natural disasters and other unforeseen occurrences such as blowouts,
cratering, fires and loss of well control, which can damage or destroy wells or
production facilities, injure or kill people, and damage property and the
environment. Because third party drilling contractors are used to drill our
wells, we may not realize the full benefit of worker's compensation laws in
dealing with their employees. We maintain insurance against many potential
losses and liabilities arising from our operations. However, in accordance with
customary industry practice, we may not be fully insured against these risks,
nor may all such risks be insurable.

GOVERNMENTAL REGULATIONS ARE COSTLY AND COMPLEX, ESPECIALLY REGULATIONS RELATING
TO ENVIRONMENTAL PROTECTION.

Our U.S. exploration, production and marketing operations are regulated
extensively at the federal, state and local levels. These regulations affect the
costs, manner and feasibility of our operations. As an owner and operator of oil
and gas properties, we are subject to federal, state and local regulation of
discharge of materials into, and protection of, the environment. We have made
and will continue to make significant expenditures in our efforts to comply with
the requirements of these environmental regulations, which may impose liability
on us for the cost of pollution clean-up resulting from operations, subject us
to liability for pollution damage and require suspension or cessation of
operations in affected areas. Changes in, or additions to, regulations regarding
the protection of the environment could increase our compliance costs and may
negatively impact our business.

We are subject to state and local regulations that impose permitting,
reclamation, land use, conservation and other restrictions on our ability to
drill and produce. These laws and regulations can require well and facility
sites to be closed and reclaimed. We buy and sell interests in properties that
have been operated in the past, and, as a result of these transactions, we may
retain or assume clean-up or reclamation obligations for our own operations or
those of third parties.

U.S. offshore oil and gas operations are subject to regulations of the United
States Department of the Interior, which currently impose absolute liability
upon the lessee under a federal lease for the cost of pollution clean-up
resulting from the lessee's operations, and could subject the lessee to possible
liability for pollution damage. In the event of a serious incident of pollution,
a lessee under a federal lease may be required to suspend or cease operations in
the affected area.

In the U.K., deposits of substances or articles at sea from offshore oil and gas
operations are subject to the licensing control of the Ministry of Agriculture,
Fisheries and Food. The breach of a license will

                                       7
<PAGE>
result in criminal liability and possible civil liability for the cost of any
resulting pollution clean-up. In the event of a serious incident of pollution,
the Ministry may vary or revoke a license.

WE MAY HAVE DIFFICULTY COMPETING FOR OIL AND GAS PROPERTIES OR SUPPLIES.

We operate in a highly competitive environment, competing with major integrated
and independent energy companies for desirable oil and gas properties, as well
as for the equipment, labor and materials required to develop and operate those
properties. Many of these competitors have financial resources substantially
greater than ours. We may incur higher costs or be unable to acquire and develop
desirable properties at costs we consider reasonable because of this
competition.

OUR SHAREHOLDER RIGHTS PLAN AND BY-LAWS DISCOURAGE UNSOLICITED TAKEOVER
PROPOSALS AND COULD PREVENT YOU FROM REALIZING A PREMIUM FOR YOUR COMMON SHARES.

We have a shareholder rights plan that may have the effect of discouraging
unsolicited takeover proposals. The rights issued under the shareholder rights
plan would cause substantial dilution to a person or group that attempts to
acquire us on terms not approved in advance by our board of directors. In
addition, our articles of incorporation and by-laws contain provisions that may
discourage unsolicited takeover proposals that shareholders may consider to be
in their best interests which include:

 - provisions that members of the board of directors are elected and retire in
   rotation; and

 - the ability of the board of directors to designate the terms of, and to issue
   new series of, preferred shares.

Together, these provisions and our shareholder rights plan may discourage
transactions that otherwise could involve payment to you of a premium over
prevailing market prices for your common shares.

                      RATIOS OF EARNINGS TO FIXED CHARGES

The following table sets forth our consolidated ratio of earnings to fixed
charges or the deficiency of our consolidated earnings to cover fixed charges
for each period indicated.

<TABLE>
<CAPTION>
                                                  SIX MONTHS                  YEAR ENDED DECEMBER 31,
                                                     ENDED       --------------------------------------------------
                                                 JUNE 30, 1999     1998      1997      1996       1995       1994
                                                 -------------   --------   -------   -------   --------   --------
                                                                (U.S. $ IN THOUSANDS, EXCEPT RATIOS)
      <S>                                        <C>             <C>        <C>       <C>       <C>        <C>
      CANADIAN GENERALLY ACCEPTED ACCOUNTING
        PRINCIPLES:
       Ratio of Earnings to Fixed Charges......      --            --         2.1       2.0       --         --
       Deficiency of Earnings to Cover Fixed
         Charges...............................     $20,820      $12,157     --        --       $ 4,551    $21,757

      U.S. GENERALLY ACCEPTED ACCOUNTING
        PRINCIPLES (1):
       Ratio of Earnings to Fixed Charges......      --            --         2.5       2.3       --         --
       Deficiency of Earnings to Cover Fixed
         Charges...............................     $20,026      $98,013     --        --       $12,337    $20,798
</TABLE>

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

(1) See Note 11 to the audited consolidated financial statements for the year
    ended December 31, 1998 that appear in our Annual Report on Form 10-K for
    the year ended December 31, 1998 and Note 7 to the unaudited consolidated
    condensed financial statements for the period ended June 30, 1999 that
    appear in our Quarterly Report on Form 10-Q for the fiscal quarter ended
    June 30, 1999.

For purposes of computing the ratios of earnings to fixed charges, earnings
represent income (loss) before income taxes and fixed charges. Fixed charges
consist of interest expense and preferred share dividend requirements of our
consolidated subsidiary, Chieftain International Funding Corp.

                                       8
<PAGE>
                                USE OF PROCEEDS

Unless otherwise indicated in the applicable prospectus supplement, we will use
the net proceeds from the sale of the securities for our general corporate
purposes, which may include repaying indebtedness and funding capital
expenditures, acquisitions and working capital.

                          DESCRIPTION OF SHARE CAPITAL

The following description of our share capital is based upon our articles of
incorporation, our by-laws and applicable provisions of law. The following
description is qualified in its entirety by reference to such articles of
incorporation and by-laws, which have been filed as exhibits to earlier
registration statements filed by us with the SEC. See "Where You Can Find More
Information."

Certain provisions of our articles of incorporation and by-laws summarized in
the following paragraphs may be deemed to have an anti-takeover effect and may
delay, defer or prevent a tender offer or takeover attempt that a shareholder
might consider in its best interests, including those attempts that might result
in a premium over the market price for shares held.

AUTHORIZED AND OUTSTANDING SHARE CAPITAL

Our authorized share capital consists of an unlimited number of common shares,
an unlimited number of First Preferred shares and an unlimited number of Second
Preferred shares. As of September 30, 1999 there were 13,349,059 common shares
outstanding and no First Preferred shares or Second Preferred shares
outstanding.

COMMON SHARES

 VOTING RIGHTS

Pursuant to our articles of incorporation and by-laws, the holders of our common
shares are entitled to one vote for each common share held at all meetings of
shareholders other than meetings of another class or series of shares. However,
pursuant to the subordinated guarantee agreement that we entered into in 1992
when our subsidiary, Chieftain International Funding Corp., issued its $1.8125
Convertible Redeemable Preferred shares, we have agreed to use our best efforts,
subject to applicable law, to nominate and cause to be elected to our board of
directors two persons designated by the holders of a majority of the outstanding
Chieftain International Funding Corp. $1.8125 Convertible Redeemable Preferred
shares if Chieftain International Funding Corp. shall have failed to declare and
pay dividends on its $1.8125 Convertible Redeemable Preferred shares in the
manner required for any six or more quarterly dividend payments and until all
such accumulated and unpaid dividends are paid in full.

 DIVIDENDS AND LIQUIDATION RIGHTS

The holders of our common shares are entitled to any dividends as may be
declared by the board of directors, subject to the preferential rights attaching
to the First Preferred shares and the Second Preferred shares and any other of
our shares ranking in priority to the common shares. In addition, pursuant to
the subordinated guarantee agreement that we entered into in 1992 when our
subsidiary, Chieftain International Funding Corp., issued its $1.8125
Convertible Redeemable Preferred shares, we have agreed that we will not declare
or pay or set apart for payment any dividend on any of our share capital and
that no other distribution shall be paid or declared and set apart for payment
and no other distribution shall be made upon any of our share capital unless
(a) the full cumulative dividends on all outstanding $1.8125 Convertible
Redeemable Preferred shares have been paid, (b) sufficient funds have been set
apart for the payment of dividends for the then current period on the $1.8125
Convertible

                                       9
<PAGE>
Redeemable Preferred shares and (c) the full redemption price for the $1.8125
Convertible Redeemable Preferred shares which have been called for redemption
has been paid or set apart for payment in accordance with the certificate of
designation for the $1.8125 Convertible Redeemable Preferred shares.

In the event of our liquidation, dissolution or winding up, the holders of our
common shares are entitled, subject to the rights of the holders of our shares
ranking in priority to the common shares, to participate ratably among
themselves, and ratably with the holders of any shares ranking on a parity with
the common shares, in any distribution of our assets remaining after the payment
of all our liabilities.

 OTHER PROVISIONS

There are no preemptive rights to subscribe for any additional securities which
we may issue and there are no redemption provisions or sinking fund provisions
applicable to the common shares. All outstanding common shares are legally
issued, fully paid and nonassessable.

 TRANSFER AGENTS AND REGISTRARS

The transfer agent and registrar for our common shares in Canada is the CIBC
Mellon Trust Company at its principal office located in each of the cities of
Calgary and Toronto. The transfer agent and registrar for our common shares in
the United States is ChaseMellon Shareholder Services of New York at its
principal office located in the City of New York.

PREFERRED SHARES

Pursuant to our articles of incorporation and by-laws, we are authorized to
issue one or more series of First Preferred shares and Second Preferred shares.
The First Preferred shares and the Second Preferred shares are alike in all
respects except that any First Preferred shares have a preference over the
Second Preferred shares upon our liquidation, dissolution or winding up or in
respect of payment of any dividends thereon.

Either the First Preferred shares or the Second Preferred shares may be issued
in one or more series. Each series may consist of the number of shares as may be
determined by our board of directors. Our board of directors may, by resolution,
fix the designation, rights, privileges, restrictions and conditions attaching
to the preferred shares of each series including:

 - the rate of preferential dividends;

 - the dates of payment of dividends;

 - the terms and conditions of redemption, purchase or conversion, if any; and

 - any sinking fund or other provisions.

The holders of preferred shares are not entitled, as such, to receive notice of
or to vote at any meeting of our common shareholders except as may be required
by law.

The preferred shares of each series will rank on a parity with the preferred
shares of every other series of the same class. They will be entitled to
preference over our common shares and any other shares ranking junior to them
with respect to priority in payment of dividends and to the distribution of
assets or return of capital in the event of our liquidation, dissolution or
winding up, or any other distribution of the assets or return of capital among
our shareholders for the purpose of winding up our affairs. However, pursuant to
the subordinated guarantee agreement that we entered into in 1992 when our
subsidiary, Chieftain International Funding Corp., issued its $1.8125
Convertible Redeemable Preferred shares, we may not pay dividends on our
preferred shares until the payment of dividends on the

                                       10
<PAGE>
$1.8125 Convertible Redeemable Preferred shares has been provided for. See
"Common Shares--Dividends and Liquidation Rights" for more information. In the
event of our liquidation, dissolution, winding up or other distribution of our
assets or return of capital, the holders of the preferred shares will be
entitled to receive, in priority to the holders of our common shares and any
other shares ranking junior to the preferred shares, the amount paid up on the
preferred shares and all accrued and unpaid dividends. The holders of the
preferred shares will not be entitled to share in any further distribution of
our property or assets.

The applicable prospectus supplement will describe the terms of any series of
preferred shares being offered, including:

 - the number of shares and designation or title of the shares;

 - any liquidation preference per share;

 - any redemption, repayment or sinking fund provisions;

 - any dividend rate or rates and the dates of payment (or the method for
   determining the dividend rates or dates of payment);

 - any voting rights;

 - the currency or currencies, including composite currencies in which the
   preferred shares are denominated and/or in which payments will or may be
   payable;

 - the method by which amounts in respect of the preferred shares may be
   calculated and any commodities, currencies or indices, or value, rate or
   price, relevant to such calculation;

 - whether the preferred shares are convertible or exchangeable and, if so, the
   securities or rights into which the preferred shares are convertible or
   exchangeable, and the terms and conditions of conversion or exchange;

 - the place or places where dividends and other payments on the preferred
   shares will be payable;

 - any conditions or restrictions on the creation and the issuance of any
   additional shares; and

 - any additional voting, dividend, liquidation, redemption and other rights,
   preferences, privileges, limitations and restrictions.

The transfer agent for each series of preferred shares will be described in the
applicable prospectus supplement.

ANTI-TAKEOVER EFFECTS OF PROVISIONS OF OUR ARTICLES OF INCORPORATION AND BY-LAWS

Our articles of incorporation and by-laws provide that our directors shall be
elected and retire in rotation. Directors are elected to three year terms and
only one-third of the directors stands for election in a given year. In
addition, our board of directors has the ability to designate the terms of, and
to issue new series of, preferred shares. These provisions may have the effect
of discouraging unsolicited takeover proposals that our common shareholders
might consider to be in their best interests and that otherwise could involve
payment to our common shareholders of a premium over prevailing market prices
for their common shares.

OUR RIGHTS PLAN

Pursuant to our shareholder rights plan, one right to purchase additional common
shares attaches to each of our common shares. In addition, one convertible right
attaches to each $1.8125 Convertible Redeemable Preferred share of Chieftain
International Funding Corp. Each convertible right entitles its

                                       11
<PAGE>
holder to receive one right to purchase additional common shares for each whole
common share issued upon conversion of such convertible preferred share into our
common shares. The rights and the convertible rights trade automatically with
their respective shares and become exercisable under the circumstances described
below. Until a right is exercised, the holder of the right, as such, will have
no rights as a shareholder, including the right to vote or receive dividends.

 CERTAIN EFFECTS OF OUR RIGHTS PLAN

Our rights plan is designed to protect our shareholders in the event of
unsolicited offers to acquire us and other coercive takeover tactics. The
primary purpose of our rights plan is to ensure that any bid for our common
shares, in the context of a takeover, will be made for all our common shares, at
the same price, and with sufficient time for our common shareholders to fully
consider the bid. The provisions of our rights plan may render an unsolicited
takeover of us more difficult or less likely to occur or might prevent such a
takeover, even though such a takeover may offer our common shareholders the
opportunity to sell their common shares at a price above the prevailing market
rate and may be favored by a majority of our common shareholders. See "Risk
Factors--Our shareholder rights plan and by-laws discourage unsolicited takeover
proposals and could prevent you from realizing a premium for your common
shares."

 SUMMARY OF PRINCIPAL ATTRIBUTES OF OUR RIGHTS PLAN

The following is a general summary of the terms of our rights plan, which is
qualified in its entirety by reference to the text of the rights plan agreement.

(a) One right to purchase common shares on the terms and conditions set forth in
    the rights plan agreement is issued at no cost and attaches to each
    outstanding common share.

(b) One convertible right entitling the holder to receive one right for each
    whole common share issued on conversion of a $1.8125 Convertible Redeemable
    Preferred share of Chieftain International Funding Corp., which is
    convertible into our common shares, is issued at no cost and attaches to
    each such outstanding convertible preferred share.

(c) Until the "separation time" (the eighth trading day following the earlier of
    (1) the date on which a person or group of people acquire beneficial
    ownership (as defined in the rights plan) of 25% or more of our common
    shares (an "acquiring person") and (2) the commencement date of a takeover
    bid which is not a Permitted Bid (as defined below)), rights trade with the
    common shares to which they are attached, have no value and may not be
    exercised.

(d) At the separation time, rights separate and trade separately from the common
    shares and, promptly following the separation time, separate certificates
    evidencing the rights are mailed to holders of record of our common shares
    and, as applicable, to the holders of record of the $1.8125 Convertible
    Redeemable Preferred shares of Chieftain International Funding Corp. as of
    the separation time. In addition, after the separation time, each right
    (other than any rights held by the acquiring person) may be exercised to
    acquire, on payment of the exercise price, common shares having an aggregate
    market value equal to twice the exercise price. The initial exercise price
    of a right is Cdn. $80 or the U.S.$ equivalent thereof (the "exercise
    price") and is subject to certain adjustments. Where a takeover bid that is
    not a Permitted Bid or a Competing Permitted Bid (as defined below) is
    withdrawn after the separation time, our board of directors may elect to
    redeem all the outstanding rights at a price of Cdn. $0.001 each. Upon such
    redemption, the rights plan will continue in effect as if the separation
    time had never occurred.

(e) A Permitted Bid is an offer:

       - that is open for a minimum of 75 days;

                                       12
<PAGE>
       - that is made to acquire all of our outstanding common shares;

       - that is made by an offeror holding not more than 10% of our common
         shares;

       - pursuant to which the offeror agrees not to acquire any additional
         common shares unless 50% or more of the shares not held by the offeror
         are tendered, failing which the offer will cease to be a Permitted Bid;
         and

       - which, if successful, allows shareholders who have not already tendered
         their shares a further 15 business days in which to do so.

(f) A Competing Permitted Bid has the same requirements as a Permitted Bid
    except that a Competing Permitted Bid must remain open for the greater of
    21 days and the time then remaining under the outstanding Permitted Bid. The
    reduction in the acceptance time for a Competing Permitted Bid is intended
    to allow, to the extent possible, all takeover bids to be considered by our
    common shareholders within the same time period.

(g) The shareholder rights plan has a term of 10 years from February 23, 1994.

 GENERAL IMPACT OF OUR RIGHTS PLAN

Our rights plan should not deter a person from acquiring control of us if that
person is prepared to make a takeover bid pursuant to the Permitted Bid or
Competing Permitted Bid requirements. However, if an acquiring person makes a
bid to acquire 25% or more of our common shares, other than by a Permitted Bid
or Competing Permitted Bid, holders of rights, other than the acquiring person,
may acquire additional common shares at a 50% discount to the then prevailing
market price. As a result, it is unlikely that any person will acquire 25% or
more of our outstanding common shares other than by way of a Permitted Bid or a
Competing Permitted Bid.

The proxy mechanism of the Business Corporations Act (Alberta) is not affected
by our rights plan, and a shareholder may use his statutory rights thereunder to
promote a change in our management or direction. Under the Business Corporations
Act (Alberta), shareholders holding not less than 5% of a company's outstanding
shares that carry the right to vote at a meeting may requisition the board of
directors of that company to call a meeting of shareholders.

                                       13
<PAGE>
                         DESCRIPTION OF DEBT SECURITIES

This section describes the general terms and provisions of the debt securities
that we may issue under the shelf registration statement. The prospectus
supplement will describe the specific terms of the debt securities offered by
that prospectus supplement.

We may issue debt securities either separately or together with, or upon the
conversion of, or in exchange for, other securities. The debt securities are to
be either our senior obligations, issued in one or more series and referred to
herein as the "senior debt securities," or subordinated obligations issued in
one or more series and referred to herein as the "subordinated debt securities."
The senior debt securities and the subordinated debt securities are collectively
referred to as the "debt securities." We will issue each series of debt
securities under an "indenture" to be entered into by us and a "trustee,"
qualified under the Trust Indenture Act of 1939. The name of the trustee will be
set forth in the applicable prospectus supplement.

The indenture will be subject to and governed by the Trust Indenture Act of
1939.

SPECIFIC TERMS OF EACH SERIES OF DEBT SECURITIES IN THE PROSPECTUS SUPPLEMENT

The applicable prospectus supplement will describe the terms of any debt
securities being offered, including:

 - the designation, aggregate principal amount and authorized denominations;

 - whether the debt securities are senior debt securities or subordinated debt
   securities;

 - the maturity date;

 - the interest rate, if any, and the method for calculating the interest rate;

 - the interest payment dates and the record dates for the interest payments;

 - any mandatory or optional redemption terms or prepayment, conversion, sinking
   fund or exchangeability or convertibility provisions;

 - the places where the principal and interest will be payable;

 - if other than denominations of $1,000 or multiples of $1,000, the
   denominations the debt securities will be issued in;

 - whether the debt securities will be issued in the form of global securities
   or certificates;

 - additional provisions, if any, relating to the defeasance and covenant
   defeasance of the debt securities;

 - whether the debt securities will be issuable in registered form or bearer
   form or both and, if bearer securities are issuable, any restrictions
   applicable to the exchange of one form for another and the offer, sale and
   delivery of bearer securities;

 - any applicable material federal tax consequences;

 - the dates on which a premium, if any, will be payable;

 - our right, if any, to defer payment of interest and the maximum length of
   such deferral period;

 - any listing on a securities exchange;

 - if convertible into common shares or preferred shares, the terms on which
   such debt securities are convertible;

                                       14
<PAGE>
 - the terms, if any, of any guarantee of the payment of principal of, and
   premium, if any, and interest on debt securities of the series and any
   corresponding changes to the provisions of the indenture as currently in
   effect;

 - the terms, if any, of the transfer, mortgage, pledge, or assignment as
   security for the debt securities of the series of any properties, assets,
   moneys, proceeds, securities or other collateral, including whether certain
   provisions of the Trust Indenture Act are applicable, and any corresponding
   changes to provisions of the indenture as currently in effect;

 - if the purchase price of any debt securities is payable in a currency other
   than U.S. dollars or if principal of, or premium, if any, or interest on any
   of the debt securities is payable in any currency other than U.S. dollars,
   the specific terms and other information with respect to such debt securities
   and such foreign currency;

 - the initial public offering price; and

 - other specific terms, including covenants and the events of default provided
   for with respect to the debt securities.

Debt securities may be issued with original issue discount to be sold at a
substantial discount below their principal amount. They may include "zero
coupon" securities that do not pay any cash interest for the entire term of the
securities. In the event of an acceleration of the maturity of any original
issue discount security, the amount payable to the holder thereof upon such
acceleration will be determined in the manner described in the applicable
prospectus supplement. Conditions pursuant to which payment of the principal of
the subordinated debt securities may be accelerated will be set forth in the
applicable prospectus supplement. Material federal income tax and other
considerations applicable to original issue discount securities will be
described in the applicable prospectus supplement.

COVENANTS

Under the indenture, we will be required to:

 - pay the principal, interest and any premium on the debt securities when due;

 - maintain a place of payment;

 - deliver a report to the trustee at the end of each fiscal year reviewing our
   obligations under the indenture; and

 - deposit sufficient funds with any paying agent on or before the due date for
   any principal, interest or any premium.

Any particular series of debt securities may contain covenants limiting:

 - the incurrence of additional debt (including guarantees) by us and our
   subsidiaries;

 - the making of certain payments by us and our subsidiaries;

 - our business activities and those of our subsidiaries;

 - the issuance of other securities by our subsidiaries;

 - asset dispositions;

 - transactions with our subsidiaries and other affiliates;

 - a change of control;

 - the incurrence of liens; and

                                       15
<PAGE>
 - certain mergers and consolidations involving us and our subsidiaries.

Any additional covenants will be described in the applicable prospectus
supplement.

REGISTRATION, TRANSFER, PAYMENT AND PAYING AGENT

Unless otherwise indicated in a prospectus supplement, each series of debt
securities will be issued in registered form only, without coupons. The
indenture, however, will provide that we may also issue debt securities in
bearer form only, or in both registered and bearer form. Bearer securities will
not be offered, sold, resold or delivered in connection with their original
issuance in the United States or to any United States person other than offices
located outside the United States of certain United States financial
institutions.

Principal, interest and any premium on fully registered securities will be paid
at the office of the paying agent that we may designate. We will make payment by
check mailed to persons in whose names the debt securities are registered on
days specified in the indenture or any prospectus supplement. Debt security
payments in other forms will be paid at a place designated by us and specified
in a prospectus supplement.

Fully registered securities may be transferred or exchanged at the corporate
trust office of the trustee or at any other office or agency maintained by us
for these purposes, without payment of any service charge, except for any tax or
governmental charge.

RANKING OF DEBT SECURITIES

The senior debt securities will be our unsubordinated obligations and will rank
equally in right of payment with all of our other unsubordinated indebtedness.
The subordinated debt securities will be subordinated in right of payment to all
existing and future senior indebtedness as set forth in the applicable
prospectus supplement.

GLOBAL SECURITIES

The debt securities of a series may be issued in whole or in part in the form of
one or more global securities that will be deposited with, or on behalf of, a
"depositary" identified in the prospectus supplement relating to such series.
Unless and until it is exchanged in whole or in part for individual certificates
evidencing debt securities, a global debt security may not be transferred except
as a whole (1) by the depositary to a nominee of such depositary, (2) by a
nominee of such depositary to such depositary or another nominee of such
depositary or (3) by such depositary or any such nominee to a successor of such
depositary or a nominee of such successor. See "Book-Entry, Delivery and Form"
below for additional information.

To the extent not described in this prospectus, the terms of the depositary
arrangement with respect to a series of global debt securities and certain
limitations and restrictions relating to a series of global bearer securities
will be described in the prospectus supplement.

DISCHARGING OUR OBLIGATIONS

Except as may otherwise be set forth in any prospectus supplement, we may choose
to either discharge our obligations on the debt securities of any series in a
legal defeasance or release ourselves from our covenant restrictions on the debt
securities of any series in a covenant defeasance. We may do so at

                                       16
<PAGE>
any time prior to the stated maturity or redemption of the debt securities of
the series if, among other conditions:

 - we deposit with the trustee sufficient cash or U.S. government securities to
   pay the principal, interest, any premium and any other sums due to the stated
   maturity date or redemption date of the debt securities of the series; and

 - we provide an opinion of our counsel that holders of the debt securities will
   not be affected for U.S. federal income tax purposes by the defeasance.

If we choose the legal defeasance option, holders of the debt securities of that
series will not be entitled to the benefits of the indenture except for
registration of transfer and exchange of debt securities, replacement of lost,
stolen or mutilated debt securities, any required conversion or exchange of debt
securities, any required sinking fund payments and receipt of principal and
interest on the original stated due dates or specified redemption dates.

BOOK-ENTRY, DELIVERY AND FORM

Unless otherwise stated in any prospectus supplement, The Depository Trust
Company, New York, New York ("DTC") will act as depositary. Book-entry debt
securities of a series will be issued in the form of a global debt security that
will be deposited with DTC. This means that we will not issue certificates to
each holder. One global debt security will be issued to DTC who will keep a
computerized record of its participants (for example, your broker) whose clients
have purchased the debt securities. The participant will then keep a record of
its clients who purchased the debt securities. Unless it is exchanged in whole
or in part for a certificated debt security, a global debt security may not be
transferred; except that DTC, its nominees and their successors may transfer a
global debt security as a whole to one another.

Beneficial interests in global debt securities will be shown on, and transfers
of global debt securities will be made only through, records maintained by DTC
and its participants.

DTC has provided us with the following information: DTC is a limited-purpose
trust company organized under the New York Banking Law, a "banking organization"
within the meaning of the New York Banking Law, a member of the United States
Federal Reserve System, a "clearing corporation" within the meaning of the New
York Uniform Commercial Code and a "clearing agency" registered under the
provisions of Section 17A of the Securities Exchange Act of 1934. DTC holds
securities that its participants ("Direct Participants") deposit with DTC. DTC
also records the settlement among Direct Participants of securities
transactions, such as transfers and pledges, in deposited securities through
computerized records for Direct Participant's accounts. This eliminates the need
to exchange certificates. Direct Participants include securities brokers and
dealers, banks, trust companies, clearing corporations and some other
organizations.

DTC's book-entry system is also used by other organizations such as securities
brokers and dealers, banks and trust companies that work through a Direct
Participant. The rules that apply to DTC and its participants are on file with
the SEC.

DTC is owned by a number of its Direct Participants and by the New York Stock
Exchange, Inc., The American Stock Exchange, Inc. and the National Association
of Securities Dealers, Inc.

We will wire principal and interest payments to DTC's nominee. We and the
trustee will treat DTC's nominee as the owner of the global debt securities for
all purposes. Accordingly, we, the trustee and any paying agent will have no
direct responsibility or liability to pay amounts due on the global debt
securities to owners of beneficial interests in the global debt securities.

                                       17
<PAGE>
It is DTC's current practice, upon receipt of any payment of principal or
interest, to credit Direct Participants' accounts on the payment date according
to their respective holdings of beneficial interests in the global debt
securities as shown on DTC's records. In addition, it is DTC's current practice
to assign any consenting or voting rights to Direct Participants whose accounts
are credited with debt securities on a record date, by using an omnibus proxy.
Payments by participants to owners of beneficial interests in the global debt
securities, and voting by participants, will be governed by the customary
practices between the participants and owners of beneficial interests, as is the
case with debt securities held for the account of customers registered in
"street name." However, payments will be the responsibility of the participants
and not of DTC, the trustee or us.

Debt securities represented by a global debt security will be exchangeable for
certificated debt securities with the same terms in authorized denominations
only if:

 - DTC notifies us that it is unwilling or unable to continue as depositary or
   if DTC ceases to be a clearing agency registered under applicable law and a
   successor depositary is not appointed by us within 90 days; or

 - We determine not to require all of the debt securities of a series to be
   represented by a global debt security and notify the trustee of our decision.

MODIFICATION OF INDENTURE

Under the indenture, generally we and the trustee will be able to modify our
rights and obligations and the rights of the holders with the consent of the
holders of a specified percentage of the outstanding holders of each series of
debt affected by the modification. No modification of the principal or interest
payment terms, and no modification reducing the percentage required for
modifications, will be effective against any holder without its consent. In
addition, we and the trustee will be able to amend the indenture without the
consent of any holder of the debt securities to make technical changes.

THE TRUSTEES

The Trust Indenture Act contains limitations on the rights of a trustee, should
it become a creditor of ours, to obtain payment of claims in certain cases or to
realize on certain property received by it in respect of any such claims, as
security or otherwise. Each trustee will be permitted to engage in other
transactions with us and our subsidiaries from time to time, provided that if
such Trustee should acquire any conflicting interest it must eliminate such
conflict upon the occurrence of an event of default under the relevant
indenture, or else resign.

                                       18
<PAGE>
                            DESCRIPTION OF WARRANTS

We may issue warrants for the purchase of debt securities, preferred shares or
common shares. Warrants may be issued independently or together with debt
securities, preferred shares or common shares offered by any prospectus
supplement and may be attached to or separate from any such offered securities.
Each series of warrants will be issued under a separate warrant agreement to be
entered into between us and a bank or trust company, as warrant agent. The
warrant agent will act solely as our agent in connection with the warrants and
will not assume any obligation or relationship of agency or trust for or with
any holders or beneficial owners of warrants. The following summary of certain
provisions of the warrants does not purport to be complete and is subject to,
and qualified in its entirety by reference to, the provisions of the warrant
agreement that will be filed with the SEC in connection with the offering of
such warrants.

DEBT WARRANTS

The prospectus supplement relating to a particular issue of debt warrants will
describe the terms of such debt warrants, including the following:

 - the title of such debt warrants;

 - the offering price for such debt warrants, if any;

 - the aggregate number of such debt warrants;

 - the designation and terms of the debt securities that may be purchased upon
   exercise of such debt warrants;

 - if applicable, the designation and terms of the debt securities with which
   such debt warrants are issued and the number of such debt warrants issued
   with each such debt security;

 - if applicable, the date from and after which such debt warrants and any debt
   securities issued therewith will be separately transferable;

 - the principal amount of debt securities that may be purchased upon exercise
   of a debt warrant and the price at which such principal amount of debt
   securities may be purchased upon exercise (which price may be payable in
   cash, securities, or other property);

 - the date on which the right to exercise such debt warrants shall commence and
   the date on which such right shall expire;

 - if applicable, the minimum or maximum amount of such debt warrants that may
   be exercised at any one time;

 - whether the debt warrants represented by the debt warrant certificates or
   debt securities that may be issued upon exercise of the debt warrants will be
   issued in registered or bearer form;

 - information with respect to book-entry procedures, if any;

 - the currency or currency units in which the offering price, if any, and the
   exercise price are payable;

 - if applicable, a discussion of material United States federal income tax
   considerations;

 - the antidilution provisions of such debt warrants, if any;

 - the redemption or call provisions, if any, applicable to such debt warrants;
   and

 - any additional terms of such debt warrants, including terms, procedures, and
   limitations relating to the exchange and exercise of such debt warrants.

                                       19
<PAGE>
SHARE WARRANTS

The prospectus supplement relating to any particular issue of preferred share
warrants or common share warrants will describe the terms of such warrants,
including the following:

 - the title of such warrants;

 - the offering price for such warrants, if any;

 - the aggregate number of such warrants;

 - the designation and terms of the common shares or preferred shares that may
   be purchased upon exercise of such warrants;

 - if applicable, the designation and terms of the offered securities with which
   such warrants are issued and the number of such warrants issued with each
   such offered security;

 - if applicable, the date from and after which such warrants and any offered
   securities issued therewith will be separately transferable;

 - the number of common shares or preferred shares that may be purchased upon
   exercise of a warrant and the price at which such shares may be purchased
   upon exercise;

 - the date on which the right to exercise such warrants shall commence and the
   date on which such right shall expire;

 - if applicable, the minimum or maximum amount of such warrants that may be
   exercised at any one time;

 - the currency or currency units in which the offering price, if any, and the
   exercise price are payable;

 - if applicable, a discussion of material United States federal income tax
   considerations;

 - the antidilution provisions of such warrants, if any;

 - the redemption or call provisions, if any, applicable to such warrants; and

 - any additional terms of such warrants, including terms, procedures and
   limitations relating to the exchange and exercise of such warrants.

                                       20
<PAGE>
                              PLAN OF DISTRIBUTION

The distribution of the securities may be effected from time to time in one or
more transactions at a fixed price or prices (which may be changed from time to
time), at market prices prevailing at the time of sale, at prices related to
such prevailing market prices or at negotiated prices. Each prospectus
supplement will describe the method of distribution of the securities offered
therein.

Chieftain may sell securities directly, through agents designated from time to
time, through underwriting syndicates led by one or more managing underwriters
or through one or more underwriters acting alone. Each prospectus supplement
will describe the terms of the securities to which such prospectus supplement
relates, the name or names of any underwriters or agents with whom we have
entered into arrangements with respect to the sale of such securities, the
public offering or purchase price of such securities and the net proceeds we
will receive from such sale. In addition, each prospectus supplement will
describe any underwriting discounts and other items constituting underwriters'
compensation, any discounts and commissions allowed or paid to dealers, if any,
any commissions allowed or paid to agents, and the securities exchange or
exchanges, if any, on which such securities will be listed. Dealer trading may
take place in certain of the securities, including securities not listed on any
securities exchange.

If so indicated in the applicable prospectus supplement, we will authorize
underwriters or agents to solicit offers from certain institutions to purchase
securities from us pursuant to delayed delivery contracts providing for payment
and delivery at a future date. Institutions with which such contracts may be
made include, among others:

 - commercial and savings banks;

 - insurance companies;

 - pension funds;

 - investment companies; and

 - educational and charitable institutions.

In all cases, such institutions must be approved by us. Unless otherwise set
forth in the applicable prospectus supplement, the obligations of any purchaser
under any such contract will not be subject to any conditions except that
(a) the purchase of the securities will not at the time of delivery be
prohibited under the laws of the jurisdiction to which such purchaser is subject
and (b) if the securities are also being sold to underwriters acting as
principals for their own account, the underwriters will have purchased such
securities not sold for delayed delivery. The underwriters and such other
persons will not have any responsibility in respect of the validity or
performance of such contracts.

Any underwriter or agent participating in the distribution of the securities may
be deemed to be an underwriter, as that term is defined in the Securities Act,
of the securities so offered and sold and any discounts or commission received
by them, and any profit realized by them on the sale or resale of the securities
may be deemed to be underwriting discounts and commissions under the Securities
Act.

Certain of any such underwriters and agents, including their associates, may
engage in transactions with and perform services for us and our subsidiaries in
the ordinary course of business. One or more of our affiliates may from time to
time act as an agent or underwriter in connection with the sale of the
securities to the extent permitted by applicable law. The participation of any
such affiliate in the offer and sale of the securities will comply with
Rule 2720 of the Conduct Rules of the National Association of Securities
Dealers, Inc. regarding the offer and sale of securities of an affiliate.

Except as indicated in the applicable prospectus supplement, the securities are
not expected to be listed on a securities exchange, except for the common
shares, which are listed on the American Stock

                                       21
<PAGE>
Exchange and The Toronto Stock Exchange, and any underwriters or dealers will
not be obligated to make a market in securities. We cannot predict the activity
or liquidity of any trading in the securities.

                                 LEGAL MATTERS

The validity of the securities in respect of which this prospectus is being
delivered will be passed on for us by Bennett Jones, Calgary, Alberta. Certain
other legal matters in connection with the securities will be passed on for us
by Cravath, Swaine & Moore, New York, New York.

                                    EXPERTS

The audited financial statements incorporated by reference in this prospectus
have been audited by PricewaterhouseCoopers LLP, as indicated in their report
with respect to such audited financial statements, and are incorporated by
reference in reliance upon the authority of such firm as experts in giving such
reports. PricewaterhouseCoopers LLP is located at 1501 TD Tower, 10088 - 102
Avenue, Edmonton, Alberta, Canada, T5J 2Z1. The reserve estimates relating to
our U.S. reserves, of Netherland, Sewell & Associates, Inc. incorporated by
reference in this prospectus, have been incorporated by reference in reliance
upon the authority of such firm as experts in petroleum engineering.

                                       22

<PAGE>

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                       [LOGO]

           CHIEFTAIN INTERNATIONAL, INC.
                                                         CIBC WORLD MARKETS
                  2,500,000 SHARES
                   COMMON SHARES

           ------------------------------              DAIN RAUSCHER WESSELS
               PROSPECTUS SUPPLEMENT
           ------------------------------

                 November 10, 1999                    A.G. EDWARDS & SONS, INC.





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

YOU SHOULD RELY ONLY ON THE INFORMATION WE HAVE INCLUDED OR INCORPORATED BY
REFERENCE IN THIS PROSPECTUS SUPPLEMENT AND THE ACCOMPANYING PROSPECTUS. WE HAVE
NOT AUTHORIZED ANYONE TO PROVIDE YOU WITH ADDITIONAL OR DIFFERENT INFORMATION.
IF YOU RECEIVE ANY UNAUTHORIZED INFORMATION, YOU MUST NOT RELY ON IT. WE ARE
OFFERING TO SELL THE SECURITIES ONLY IN JURISDICTIONS WHERE SALES ARE PERMITTED.
YOU SHOULD NOT ASSUME THAT THE INFORMATION WE HAVE INCLUDED IN THIS PROSPECTUS
SUPPLEMENT AND THE ACCOMPANYING PROSPECTUS IS ACCURATE AS OF ANY DATE OTHER THAN
THE DATE OF THIS PROSPECTUS SUPPLEMENT OR THAT ANY INFORMATION WE HAVE
INCORPORATED BY REFERENCE IS ACCURATE AS OF ANY DATE OTHER THAN THE DATE OF THE
DOCUMENT INCORPORATED BY REFERENCE.




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