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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. + References No definition available. + Details
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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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267 + Details
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