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COMMITMENTS AND CONTINGENCIES: (Tables) | 3 Months Ended
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Mar. 31, 2024
COMMITMENTS AND CONTINGENCIES: |
Schedule of environmental capital investments | Environmental capital investments in the three-month period ended March 31, 2024 and 2023 were as follows (in millions):
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2024 |  | 2023
Peruvian operations | ​ | $ | 1.6 | ​ | $ | 2.7
Mexican operations | ​ |  | 42.1 | ​ |  | 23.2
​ | ​ | $ | 43.7 | ​ | $ | 25.9

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