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INTANGIBLE ASSETS: (Tables) | 12 Months Ended
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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. + Details
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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 + Details
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