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COMMITMENTS AND CONTINGENCIES: (Tables) | 6 Months Ended
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Jun. 30, 2022
COMMITMENTS AND CONTINGENCIES: |
Schedule of environmental capital investments | ​ Environmental capital investments in the first six months of 2022 and 2021 were as follows (in millions): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2022 |  | 2021
Peruvian operations | ​ | $ | 2.9 | ​ | $ | 0.7
Mexican operations | ​ |  | 27.2 | ​ |  | 21.8
​ | ​ | $ | 30.1 | ​ | $ | 22.5
​

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