Exhibit 99.1

                                Certification of
                             Chief Executive Officer
                        of Mission Resources Corporation

This certification is provided pursuant to Section 906 of the Sarbanes-Oxley Act
of 2002, 18 U.S.C. (S) 1350, and accompanies the annual report on Form 10-K (the
"Form 10-K") for the period ended December 31, 2002 of Mission Resources
Corporation (the "Issuer").

I, Robert L. Cavnar, the Chief Executive Officer of the Issuer, certify that:

     (i)  the Form 10-K fully complies with the requirements of section 13(a) or
          section 15(d) of the Securities Exchange Act of 1934 and

     (ii) the information contained in the Form 10-K fairly presents, in all
          material respects, the financial condition and results of operations
          of the Issuer.

Dated:  March 25, 2003

                                            /s/ Robert L. Cavnar
                                            ------------------------------------


Subscribed and sworn to before me
this 25th day of March 2003



/s/ Carmen M. Garcia
--------------------------------------


Notary Public in and for the
State of Texas

My commission expires:







A signed original of this written statement required by Section 906 has been
provided to Mission Resources Corporation and will be retained by Mission
Resources Corporation and furnished to the Securities and Exchange Commission or
its staff upon request.