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COMMITMENTS AND CONTINGENCIES: (Tables)

12 Months Ended

Dec. 31, 2017

COMMITMENTS AND CONTINGENCIES:

Schedule of environmental capital investments

        Environmental capital investments in years 2017, 2016 and 2015, were as follows (in millions):

		2017			2016			2015
Peruvian operations		$	93.7		$	110.3		$	98.8
Mexican operations			128.9			140.1			22.0
​	​	​	​	​	​	​	​	​	​	​
Total		$	222.6		$	250.4		$	120.8
​	​	​	​	​	​	​	​	​	​	​
​	​	​	​	​	​	​	​	​	​	​

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