<ARTICLE> 5 <LEGEND> This schedule contains summary financial information extracted from the Consolidated Balance Sheet at June 30, 1998 and the related Statement of Consolidated Operations for the six months ended June 30, 1998 and is qualified in its entirety by reference to such financial statements. </LEGEND> <MULTIPLIER> 1,000 <PERIOD-TYPE> 6-MOS <FISCAL-YEAR-END> DEC-31-1998 <PERIOD-END> JUN-30-1998 <CASH> 134,219 <SECURITIES> 149,699 <RECEIVABLES> 48,711 <ALLOWANCES> 0 <INVENTORY> 83,431 <CURRENT-ASSETS> 450,194 <PP&E> 2,204,344 <DEPRECIATION> 1,271,610 <TOTAL-ASSETS> 1,505,461 <CURRENT-LIABILITIES> 142,436 <BONDS> 356,069 <PREFERRED-MANDATORY> 0 <PREFERRED> 0 <COMMON> 211,162 <OTHER-SE> 393,586 <TOTAL-LIABILITY-AND-EQUITY> 1,505,461 <SALES> 416,824 <TOTAL-REVENUES> 411,502 <CGS> 351,798 <F1> <TOTAL-COSTS> 375,635 <F2> <OTHER-EXPENSES> 55,098 <F3> <LOSS-PROVISION> 0 <INTEREST-EXPENSE> 10,328 <INCOME-PRETAX> (29,559) <INCOME-TAX> 2,342 <INCOME-CONTINUING> (37,517) <DISCONTINUED> 0 <EXTRAORDINARY> 0 <CHANGES> 0 <NET-INCOME> (37,517) <EPS-PRIMARY> (0.18) <EPS-DILUTED> (0.18) <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 the Statement of Consolidated Operations. <F3> Includes Exploration expense, Write-downs and other unusual charges, Business combination and integration costs and Other expense from the Statement of Consolidated Operations. </FN>