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COMMITMENTS AND CONTINGENCIES: (Tables) | 12 Months Ended
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Dec. 31, 2012
COMMITMENTS AND CONTINGENCIES: |
Schedule of environmental capital expenditures | Environmental capital expenditures in years 2012, 2011 and 2010, were as follows (in millions):
|  | 2012 |  | 2011 |  | 2010 |
Peruvian operations |  | $ | 3.4 |  | $ | 2.5 |  | $ | 6.4 |
Mexican operations |  | 20.7 |  | 11.5 |  | 10.2 |
Total |  | $ | 24.1 |  | $ | 14.0 |  | $ | 16.6 |

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- Definition Tabular disclosure of environmental capital expenditures incurred during the period. + References No definition available. + Details
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