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COMMITMENTS AND CONTINGENCIES: (Tables) | 3 Months Ended
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Mar. 31, 2022
COMMITMENTS AND CONTINGENCIES: |
Schedule of environmental capital investments | ​ Environmental capital investments in the first quarter of 2022 and 2021 were as follows (in millions): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2022 |  | 2021
Peruvian operations | ​ | $ | 1.4 | ​ | $ | 0.1
Mexican operations | ​ |  | 12.6 | ​ |  | 5.4
​ | ​ | $ | 14.0 | ​ | $ | 5.5
​

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