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INTANGIBLE ASSETS: Goodwill (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Intangible assets
Goodwill	$ 41.9	$ 41.4
Buenavista del Cobre, S.A. de C.V
Intangible assets
Goodwill	17.0
El Pilar
Intangible assets
Goodwill	$ 24.9

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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
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-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
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-URI http://asc.fasb.org/extlink&oid=64834752&loc=SL49117168-202975

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