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COMMITMENTS AND CONTINGENCIES: (Tables) | 6 Months Ended
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Jun. 30, 2016
COMMITMENTS AND CONTINGENCIES: |
Schedule of environmental capital investments | Environmental capital investments in the six months ended June 30, 2016 and 2015 were as follows ($ in millions):
|  | 2016 |  | 2015 |
Peruvian operations |  | $ | 36.2 |  | $ | 38.0 |
Mexican operations |  | 69.5 |  | 6.9 |
|  | $ | 105.7 |  | $ | 44.9 |

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