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COMMITMENTS AND CONTINGENCIES: (Tables) | 6 Months Ended
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Jun. 30, 2013
COMMITMENTS AND CONTINGENCIES: |
Schedule of environmental capital expenditures | Environmental capital expenditures in the six months ended June 30, 2013 and 2012 were as follows (in millions):
|  | 2013 |  | 2012 |
Peruvian operations |  | $ | 2.1 |  | $ | 2.1 |
Mexican operations |  | 21.2 |  | 10.7 |
|  | $ | 23.3 |  | $ | 12.8 |

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