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INTANGIBLE ASSETS: (Tables)

12 Months Ended

Dec. 31, 2014

INTANGIBLE ASSETS:

Schedule of major classes of intangible assets and goodwill

		As of December 31,
(in millions)		2014			2013
Mining concessions		$	121.2		$	121.2
Mine engineering and development studies		6.0			6.0
Software		13.8			12.2
		141.0			139.4
Accumulated amortization:
Mining concessions		(33.9		)	(33.0		)
Mine engineering and development studies		(5.2		)	(4.9		)
Software		(9.0		)	(8.3		)
		(48.1		)	(46.2		)
Goodwill		17.0			17.0
Intangible assets, net		$	109.9		$	110.2

Schedule of amortization of intangibles in the last three years and estimated amortization for future periods

Estimated amortization expense (in millions):
2015-2019		$	7.6
Average annual		$	1.5

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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.

+ References

No definition available.

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- Definition

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

+ 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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