<ARTICLE>                     5
<LEGEND>
This  schedule  contains  summary  financial   information  extracted  from  the
Consolidated  Balance  Sheet at March  31,  1999 and the  related  Statement  of
Consolidated  Operations  for the  three  months  ended  March  31,  1999 and is
qualified in its entirety by reference to such financial statements.

</LEGEND>
<MULTIPLIER>                                   1,000
       
                             
<PERIOD-TYPE>                   3-MOS
<FISCAL-YEAR-END>                                DEC-31-1999      
<PERIOD-END>                                     MAR-31-1999
<CASH>                                               141,000
<SECURITIES>                                         126,275
<RECEIVABLES>                                         34,787
<ALLOWANCES>                                               0
<INVENTORY>                                           85,835
<CURRENT-ASSETS>                                     413,550
<PP&E>                                             2,565,569
<DEPRECIATION>                                     1,464,178
<TOTAL-ASSETS>                                     1,597,858
<CURRENT-LIABILITIES>                                142,666
<BONDS>                                              303,955
<PREFERRED-MANDATORY>                                      0
<PREFERRED>                                                0
<COMMON>                                             231,121
<OTHER-SE>                                           506,722
<TOTAL-LIABILITY-AND-EQUITY>                       1,597,858
<SALES>                                              163,078
<TOTAL-REVENUES>                                     178,533
<CGS>                                                140,449 <F1>
<TOTAL-COSTS>                                        151,430 <F2>
<OTHER-EXPENSES>                                       8,323 <F3>
<LOSS-PROVISION>                                           0
<INTEREST-EXPENSE>                                     4,545
<INCOME-PRETAX>                                       14,235 
<INCOME-TAX>                                          12,472
<INCOME-CONTINUING>                                    2,198
<DISCONTINUED>                                             0
<EXTRAORDINARY>                                            0
<CHANGES>                                                  0
<NET-INCOME>                                           2,198
<EPS-PRIMARY>                                           0.01
<EPS-DILUTED>                                           0.01

<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  and Other  expense  from the  Statement  of
     Consolidated Operations.


</FN>