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INTANGIBLE ASSETS: (Tables)

12 Months Ended

Dec. 31, 2015

INTANGIBLE ASSETS:

Schedule of major classes of intangible assets and goodwill

		At December 31,
(in millions)		2015			2014
Mining concessions		$	121.2		$	121.2
Mine engineering and development studies		6.0			6.0
Software		44.6			30.4
		171.8			157.6
Accumulated amortization:
Mining concessions		(34.8		)	(33.9		)
Mine engineering and development studies		(5.6		)	(5.2		)
Software		(17.7		)	(11.9		)
		(58.1		)	(51.0		)
Goodwill		41.4			17.0
Intangible assets, net		$	155.1		$	123.6

Schedule of estimated amortization of intangible assets for future periods

Estimated amortization expense (in millions):
2016-2020		$	26.4
Average annual		$	5.3

Schedule of changes in the carrying amount of goodwill

The changes in the carrying amount of goodwill for the year 2015 are as follows (in millions):

		2015
Balance as of January 1,		$	17.0
Goodwill acquired		24.4
Impairment losses		—
Balance as of December 31,		$	41.4

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- Definition

Tabular disclosure of the intangibles amortized in the past three years and the estimated aggregate amortization expense for intangible assets subject to amortization for each of the five succeeding fiscal years.

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- Definition

Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule.

+ References

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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
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Tabular disclosure of goodwill and intangible assets, which may be broken down by segment or major class.

+ References

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-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
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