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COMMITMENTS AND CONTINGENCIES: (Tables)

12 Months Ended

Dec. 31, 2016

COMMITMENTS AND CONTINGENCIES:

Schedule of environmental capital investments

        Environmental capital investments in years 2016, 2015 and 2014, were as follows (in millions):

		2016			2015			2014
Peruvian operations		$	110.3		$	98.8		$	127.8
Mexican operations			140.1			22.0			24.4
​	​	​	​	​	​	​	​	​	​	​
Total		$	250.4		$	120.8		$	152.2
​	​	​	​	​	​	​	​	​	​	​
​	​	​	​	​	​	​	​	​	​	​

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