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INTANGIBLE ASSETS: (Tables)

12 Months Ended

Dec. 31, 2017

INTANGIBLE ASSETS:

Schedule of major classes of intangible assets and goodwill

		At December 31,
(in millions)		2017			2016
Mining concessions		$	121.2		$	121.2
Mine engineering and development studies			19.8			19.8
Software			49.0			44.8
​	​	​	​	​	​	​	​
			190.0			185.8
Accumulated amortization:
Mining concessions			(36.6	)		(35.6	)
Mine engineering and development studies			(15.3	)		(14.8	)
Software			(27.5	)		(23.1	)
​	​	​	​	​	​	​	​
			(79.4	)		(73.5	)
Goodwill			41.9			41.9
​	​	​	​	​	​	​	​
Intangible assets, net		$	152.5		$	154.2
​	​	​	​	​	​	​	​
​	​	​	​	​	​	​	​

Schedule of estimated amortization of intangible assets for future periods

Estimated amortization expense (in millions):
2018		$	5.6
2019			5.5
2020			5.6
2021			5.5
2022			3.9
​	​	​	​	​
Total 2018 - 2022		$	26.1
​	​	​	​	​
Average annual		$	5.2
​	​	​	​	​

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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-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.

+ References

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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