EX-23 4 d15897exv23.txt CONSENT OF PRICEWATERHOUSECOOPERS LLP EXHIBIT 23 AUDITORS' CONSENT We hereby consent to the incorporation by reference in this Registration Statement on Form S-4 of the company, of our report dated January 29, 2004 relating to the financial statements, which appears in the company's Annual Report on Form 10-K for the year ended December 31, 2003. We also consent to the reference to us under the heading "Experts" in such Registration Statement. CHARTERED ACCOUNTANTS Calgary, Canada June 9, 2004