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COMMITMENTS AND CONTINGENCIES: (Tables)

6 Months Ended

Jun. 30, 2018

COMMITMENTS AND CONTINGENCIES:

Schedule of environmental capital investments

Environmental capital investments in the six months ended June 30, 2018 and 2017 were as follows (in millions):

		2018			2017
Peruvian operations		$	18.0		$	44.5
Mexican operations		26.5			35.8
		$	44.5		$	80.3

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Tabular disclosure of environmental capital expenditures incurred during the period.

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