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INTANGIBLE ASSETS: (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 1997
Intangible assets
Intangible assets excluding goodwill, gross	$ 171.8	$ 157.6
Accumulated amortization	(58.1)	(51.0)
Goodwill	41.4	17.0
Intangible assets, net	155.1	123.6
Amortization expense:
Amortization expense	7.1	4.9	$ 2.4
Estimated amortization expense:
2016-2020	26.4
Average annual	5.3
Mining concessions
Intangible assets
Intangible assets excluding goodwill, gross	121.2	121.2
Accumulated amortization	(34.8)	(33.9)
Mine engineering and development studies
Intangible assets
Intangible assets excluding goodwill, gross	6.0	6.0
Accumulated amortization	(5.6)	(5.2)
Software
Intangible assets
Intangible assets excluding goodwill, gross	44.6	30.4
Accumulated amortization	(17.7)	$ (11.9)
El Pilar
Intangible assets
Goodwill	$ 24.4
Buenavista del Cobre, S.A. de C.V
Intangible assets
Goodwill				$ 17.0

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Represents the average annual estimated amortization expense for the five succeeding fiscal years for intangible assets subject to amortization.

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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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