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COMMITMENTS AND CONTINGENCIES: (Tables) | 9 Months Ended
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Sep. 30, 2025
COMMITMENTS AND CONTINGENCIES: |
Schedule of environmental capital investments | Environmental capital investments in the nine-month periods ended September 30, 2025 and 2024 were as follows (in millions):
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2025 |  | 2024
Peruvian operations | ​ | $ | 16.0 | ​ | $ | 3.5
Mexican operations | ​ |  | 142.6 | ​ |  | 133.2
​ | ​ | $ | 158.6 | ​ | $ | 136.8

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