<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
CONSOLIDATED BALANCE SHEET AT MARCH 31, 2000 AND THE RELATED STATEMENT OF
CONSOLIDATED OPERATIONS FOR THE 3 MONTHS ENDED MARCH 31, 2000 AND IS QUALIFIED
IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000

                             
<PERIOD-TYPE>                   3-MOS
<FISCAL-YEAR-END>                          DEC-31-2000
<PERIOD-END>                               MAR-31-2000
<CASH>                                         264,064
<SECURITIES>                                    23,725
<RECEIVABLES>                                   41,218
<ALLOWANCES>                                         0
<INVENTORY>                                     64,155
<CURRENT-ASSETS>                               417,017
<PP&E>                                       2,676,938
<DEPRECIATION>                             (1,598,320)
<TOTAL-ASSETS>                               1,604,002
<CURRENT-LIABILITIES>                          144,925
<BONDS>                                        280,040
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                       253,761
<OTHER-SE>                                     477,006
<TOTAL-LIABILITY-AND-EQUITY>                 1,604,002
<SALES>                                        164,214
<TOTAL-REVENUES>                               156,064
<CGS>                                          144,530<F1>
<TOTAL-COSTS>                                  155,662<F2>
<OTHER-EXPENSES>                                10,178<F3>
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                               4,445
<INCOME-PRETAX>                               (14,221)
<INCOME-TAX>                                   (2,077)
<INCOME-CONTINUING>                           (16,143)
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                  (16,143)
<EPS-BASIC>                                     (0.06)
<EPS-DILUTED>                                   (0.06)
<FN>
<F1>INCLUDES PRODUCTION COSTS AND DEPRECIATION, DEPLETION AND AMORTIZATION FROM THE
STATEMENT OF CONSOLIDATED OPERATIONS.
<F2>INCLUDES PRODUCTION COSTS AND 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>