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COMMITMENTS AND CONTINGENCIES: (Tables) | 12 Months Ended
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Dec. 31, 2015
COMMITMENTS AND CONTINGENCIES: |
Schedule of environmental capital investments | Environmental capital investments in years 2015, 2014 and 2013, were as follows (in millions):
|  | 2015 |  | 2014 |  | 2013 |
Peruvian operations |  | $ | 98.8 |  | $ | 127.8 |  | $ | 76.9 |
Mexican operations |  | 22.0 |  | 24.4 |  | 39.8 |
Total |  | $ | 120.8 |  | $ | 152.2 |  | $ | 116.7 |

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