<ARTICLE> 5
<LEGEND>
This schedule contains summary financial information extracted from the
Consolidated Balance Sheet at December 31, 1996 and the related Statement of
Consolidated Income for the year ended December 31, 1996 and is qualified in its
entirety by reference to such financial statements.
</LEGEND>
<MULTIPLIER> 1,000
       
                             
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          DEC-31-1996
<PERIOD-END>                               DEC-31-1996
<CASH>                                          89,599
<SECURITIES>                                   130,158
<RECEIVABLES>                                   47,650
<ALLOWANCES>                                         0
<INVENTORY>                                     91,127
<CURRENT-ASSETS>                               379,348
<PP&E>                                       1,970,300
<DEPRECIATION>                                 963,270
<TOTAL-ASSETS>                               1,482,108
<CURRENT-LIABILITIES>                          116,731
<BONDS>                                        185,000
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                       146,672
<OTHER-SE>                                     621,880
<TOTAL-LIABILITY-AND-EQUITY>                 1,482,108
<SALES>                                        742,935
<TOTAL-REVENUES>                               766,936
<CGS>                                          587,686<F1>
<TOTAL-COSTS>                                  624,651<F2>
<OTHER-EXPENSES>                                59,957<F3>
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                              10,644
<INCOME-PRETAX>                                 71,684
<INCOME-TAX>                                    26,333
<INCOME-CONTINUING>                             30,281
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                    30,281
<EPS-PRIMARY>                                     0.21
<EPS-DILUTED>                                        0
<FN>
<F1>Includes Production costs and Depreciation, depletion and amortization from
Statement of Consolidated Income.
<F2>Includes Production costs and Depreciation, depletion and amortization and
Administrative and general expense from Statement of Consolidated Income.
<F3>Includes Exploration expense and Other expense from Statement of
Consolidated Income.
</FN>