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INTANGIBLE ASSETS: (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 1997
Intangible assets |  |  |  |
Intangible assets excluding goodwill, gross | $ 171.8 | $ 157.6 |  |
Accumulated amortization | (58.1) | (51.0) |  |
Goodwill | 41.4 | 17.0 |  |
Intangible assets, net | 155.1 | 123.6 |  |
Amortization expense: |  |  |  |
Amortization expense | 7.1 | 4.9 | $ 2.4 |
Estimated amortization expense: |  |  |  |
2016-2020 | 26.4 |  |  |
Average annual | 5.3 |  |  |
Mining concessions |  |  |  |
Intangible assets |  |  |  |
Intangible assets excluding goodwill, gross | 121.2 | 121.2 |  |
Accumulated amortization | (34.8) | (33.9) |  |
Mine engineering and development studies |  |  |  |
Intangible assets |  |  |  |
Intangible assets excluding goodwill, gross | 6.0 | 6.0 |  |
Accumulated amortization | (5.6) | (5.2) |  |
Software |  |  |  |
Intangible assets |  |  |  |
Intangible assets excluding goodwill, gross | 44.6 | 30.4 |  |
Accumulated amortization | (17.7) | $ (11.9) |  |
El Pilar |  |  |  |
Intangible assets |  |  |  |
Goodwill | $ 24.4 |  |  |
Buenavista del Cobre, S.A. de C.V |  |  |  |
Intangible assets |  |  |  |
Goodwill |  |  |  | $ 17.0

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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