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Acquisition of El Pilar mine (Details) $ in Thousands |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Jul. 06, 2015 USD ($) T | Sep. 30, 2015 USD ($) | Sep. 30, 2015 USD ($) | Jul. 06, 2015 USD ($)
Acquisition of El Pilar mine |  |  |  |
Payment to acquire business, net of cash acquired |  | $ 100,448 | $ 100,448 |
Recognized amounts of identifiable assets acquired and liabilities assumed |  |  |  |
Goodwill |  | 87,000 | 17,000 |
Changes in the carrying amount of goodwill |  |  |  |
Balance at the beginning of the period |  |  | 17,000 |
Goodwill acquired |  |  | 70,000 |
Balance at the end of the period |  | $ 87,000 | $ 87,000 |
Stingray |  |  |  |
Acquisition of El Pilar mine |  |  |  |
Percentage of ownership acquired (as a percent) |  |  |  | 100.00%
Payment to acquire business, net of cash acquired | $ 100,400 |  |  |
Recognized amounts of identifiable assets acquired and liabilities assumed |  |  |  |
Financial assets |  |  |  | $ 100
Mineral resources |  |  |  | 23,400
Property, plant and equipment |  |  |  | 10,500
Financial liabilities |  |  |  | (3,600)
Total identifiable net assets |  |  |  | 30,400
Goodwill | 70,000 |  |  | 70,000
Goodwill deductible for income tax |  |  |  | 0
Changes in the carrying amount of goodwill |  |  |  |
Balance at the end of the period | $ 70,000 |  |  |
Stingray | Selling, general and administrative expenses |  |  |  |
Acquisition of El Pilar mine |  |  |  |
Acquisition related costs |  |  |  | $ 400
Stingray | El Pilar |  |  |  |
Acquisition of El Pilar mine |  |  |  |
Percentage of interest in mine concession | 100.00% |  |  |
Development investment | $ 300,000 |  |  |
Average annual production of copper cathodes | T | 35,000 |  |  |
Mine life with extraction capacity of 35000 tons of copper cathodes | 13 years |  |  |

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