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COMMITMENTS AND CONTINGENCIES: (Tables) | 9 Months Ended
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Sep. 30, 2022
COMMITMENTS AND CONTINGENCIES: |
Schedule of environmental capital investments | ​ Environmental capital investments in the nine-month periods ended September 30, 2022 and 2021 were as follows (in millions):
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2022 |  | 2021
Peruvian operations | ​ | $ | 7.1 | ​ | $ | 2.9
Mexican operations | ​ |  | 35.4 | ​ |  | 57.7
​ | ​ | $ | 42.5 | ​ | $ | 60.6
​

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