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COMMITMENTS AND CONTINGENCIES: (Tables) | 3 Months Ended
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Mar. 31, 2019
COMMITMENTS AND CONTINGENCIES: |
Schedule of environmental capital investments | Environmental capital investments in the three months ended March 31, 2019 and 2018 were as follows (in millions):
|  | 2019 |  | 2018
Peruvian operations |  | $ | 10.2 |  | $ | 6.5
Mexican operations |  |  | 9.0 |  |  | 19.9
|  | $ | 19.2 |  | $ | 26.4

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