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COMMITMENTS AND CONTINGENCIES: (Tables) | 6 Months Ended
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Jun. 30, 2024
COMMITMENTS AND CONTINGENCIES: |
Schedule of environmental capital investments | Environmental capital investments in the six-month period ended June 30, 2024 and 2023 were as follows (in millions):
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2024 |  | 2023
Peruvian operations | ​ | $ | 2.0 | ​ | $ | 3.5
Mexican operations | ​ |  | 92.8 | ​ |  | 43.9
​ | ​ | $ | 94.8 | ​ | $ | 47.4

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