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INTANGIBLE ASSETS: (Tables)

12 Months Ended

Dec. 31, 2011

INTANGIBLE ASSETS:

Schedule of major classes of intangible assets and goodwill

		As of December 31,
(in millions)		2011			2010
Mining concessions		$	121.2		$	121.2
Mine engineering and development studies		6.0			6.0
Software		7.8			7.6
		135.0			134.8
Accumulated amortization		(41.6		)	(39.5		)
Goodwill		17.0			17.0
Intangible assets, net		$	110.4		$	112.3

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

Amortization expense:
2011		$	2.1
2010		$	2.1
2009		$	2.4
Estimated amortization expense:
2012-2016		$	11.9
Average annual		$	2.4

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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.

+ References

No definition available.

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- Definition

Tabular disclosure of the aggregate amount of goodwill and intangible assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Topic 350

-SubTopic 20

-Publisher FASB

-Number

-Article

-Subparagraph

-Name Accounting Standards Codification

-Paragraph 1

-Section 50

-URI http://asc.fasb.org/extlink&oid=6905597&loc=d3e13816-109267

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