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COMMITMENTS AND CONTINGENCIES: (Tables) | 6 Months Ended
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Jun. 30, 2026
COMMITMENTS AND CONTINGENCIES: |
Schedule of environmental capital investments | Environmental capital investments in the six-month periods ended June 30, 2026 and 2025 were as follows (in millions):
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ ​ ​ | 2026 | ​ ​ ​ | 2025
Peruvian operations | ​ | $ | 4.6 | ​ | $ | 6.9
Mexican operations | ​ |  | 133.5 | ​ |  | 84.2
​ | ​ | $ | 138.1 | ​ | $ | 91.1

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