<TABLE> <S> <C>

<ARTICLE>                     5
<LEGEND>
This schedule  contains  summary  financial  information  from the  Consolidated
Balance  Sheets at March 31, 1997,  June 30, 1997 and September 30, 1997 and the
related Statements of Consolidated Operations for the three, six and nine months
ended  March 31,  1997,  June 30, 1997 and  September  30,  1997,  respectively,
restated  to reflect  the April 30,  1998  pooling of  interests  with  Plutonic
Resources Limited.
</LEGEND>
<RESTATED>
<MULTIPLIER>                                   1,000

       
<S>                                                   <C>                           <C>                           <C>  
<PERIOD-TYPE>                                               3-MOS                         6-MOS                         9-MOS
<FISCAL-YEAR-END>                                     DEC-31-1997                   DEC-31-1997                   DEC-31-1997
<PERIOD-END>                                          MAR-31-1997                   JUN-30-1997                   SEP-30-1997
<CASH>                                                    178,929                        97,589                        78,366
<SECURITIES>                                              115,202                       163,788                       168,882
<RECEIVABLES>                                              52,624                        42,122                        37,897
<ALLOWANCES>                                                    0                             0                             0
<INVENTORY>                                               140,423                       128,118                       136,387
<CURRENT-ASSETS>                                          511,757                       454,144                       448,855
<PP&E>                                                  2,315,637                     2,311,166                     2,299,986
<DEPRECIATION>                                          1,040,457                     1,064,013                     1,192,567
<TOTAL-ASSETS>                                          1,977,937                     1,853,690                     1,709,692
<CURRENT-LIABILITIES>                                     232,028                       131,981                       132,975
<BONDS>                                                   253,714                       347,255                       344,294
<PREFERRED-MANDATORY>                                           0                             0                             0
<PREFERRED>                                                     0                             0                             0
<COMMON>                                                  210,475                       210,475                       210,491
<OTHER-SE>                                                821,961                       718,725                       568,287
<TOTAL-LIABILITY-AND-EQUITY>                            1,977,937                     1,853,690                     1,709,692
<SALES>                                                   234,777                       456,012                       666,340
<TOTAL-REVENUES>                                          317,338                       543,398                       761,135
<CGS>                                                     204,433  <F1>                 393,311  <F1>                 577,401  <F1>
<TOTAL-COSTS>                                             214,225  <F2>                 415,132  <F2>                 611,738  <F2>

<OTHER-EXPENSES>                                           12,577  <F3>                  98,615  <F3>                 303,896  <F3>
<LOSS-PROVISION>                                                0                             0                             0
<INTEREST-EXPENSE>                                          4,868                        10,281                        14,778
<INCOME-PRETAX>                                            85,668                        19,370                      (169,277)
<INCOME-TAX>                                               34,905                        31,047                        (3,343)
<INCOME-CONTINUING>                                        48,256                       (16,601)                     (172,162)
<DISCONTINUED>                                                  0                             0                             0
<EXTRAORDINARY>                                                 0                             0                             0
<CHANGES>                                                       0                             0                             0
<NET-INCOME>                                               48,256                       (16,601)                     (172,162)
<EPS-PRIMARY>                                                0.23                         (0.08)                        (0.82)
<EPS-DILUTED>                                                0.23                         (0.08)                        (0.82)
<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>
        


</TABLE>