<ARTICLE> 5 <LEGEND> This schedule contains summary financial information extracted from the Consolidated Balance Sheet at December 31, 1997 and the related Statement of Consolidated Income for the year ended December 31, 1997 and is qualified in its entirety by reference to such financial statements. </LEGEND> <MULTIPLIER> 1,000 <PERIOD-TYPE> 12-MOS <FISCAL-YEAR-END> DEC-31-1997 <PERIOD-END> DEC-31-1997 <CASH> 94,725 <SECURITIES> 141,221 <RECEIVABLES> 40,366 <ALLOWANCES> 0 <INVENTORY> 69,258 <CURRENT-ASSETS> 357,970 <PP&E> 1,959,222 <DEPRECIATION> 1,147,176 <TOTAL-ASSETS> 1,304,729 <CURRENT-LIABILITIES> 108,906 <BONDS> 263,855 <PREFERRED-MANDATORY> 0 <PREFERRED> 0 <COMMON> 146,735 <OTHER-SE> 385,015 <TOTAL-LIABILITY-AND-EQUITY> 1,304,729 <SALES> 659,914 <TOTAL-REVENUES> 723,834 <CGS> 585,858 <F1> <TOTAL-COSTS> 626,421 <F2> <OTHER-EXPENSES> 254,003 <F3> <LOSS-PROVISION> 0 <INTEREST-EXPENSE> 11,259 <INCOME-PRETAX> (167,849) <INCOME-TAX> (9,211) <INCOME-CONTINUING> (168,879) <DISCONTINUED> 0 <EXTRAORDINARY> 0 <CHANGES> 0 <NET-INCOME> (168,879) <EPS-PRIMARY> (1.15) <EPS-DILUTED> (1.15) <FN> <F1> Includes Production costs and Depreciation, depletion and amortization from the Statement of Consolidated Operations. <F2> Includes Production costs, Depreciation, depletion and amortization, and Administrative and general expense from Statement of Consolidated Operations. <F3> Includes Exploration expense, Write-downs and other unusual charges, and Other expense from Statement of Consolidated Operations. </FN>