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INTANGIBLE ASSETS: (Tables)

12 Months Ended

Dec. 31, 2016

INTANGIBLE ASSETS:

Schedule of major classes of intangible assets and goodwill

		At December 31,
(in millions)		2016			2015
Mining concessions		$	121.2		$	121.2
Mine engineering and development studies			19.8			6.0
Software			44.8			44.6
​	​	​	​	​	​	​	​
			185.8			171.8
Accumulated amortization:
Mining concessions			(35.6	)		(34.8	)
Mine engineering and development studies			(14.8	)		(5.6	)
Software			(23.1	)		(17.7	)
​	​	​	​	​	​	​	​
			(73.5	)		(58.1	)
Goodwill			41.9			41.4
​	​	​	​	​	​	​	​
Intangible assets, net		$	154.2		$	155.1
​	​	​	​	​	​	​	​
​	​	​	​	​	​	​	​

Schedule of estimated amortization of intangible assets for future periods

Estimated amortization expense (in millions):
2017		$	6.2
2018			5.9
2019			5.7
2020			5.9
2021			4.3
​	​	​	​	​
Total 2017 - 2021		$	28.0
​	​	​	​	​
Average annual		$	5.6
​	​	​	​	​

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Tabular disclosure of goodwill and intangible assets, which may be broken down by segment or major class.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
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-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

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Tabular disclosure of the amount of amortization expense expected to be recorded in succeeding fiscal years for finite-lived intangible assets.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

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