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Other operating expenses (Details Textual) | 12 Months Ended
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Dec. 31, 2017 USD ($)
Disclosure of other operating expenses [Abstract] |
Disputed royalties for december two thousand six through september two thousand eleven | $ 174,800,000
Net asset tax relating to royalties | 33,600,000
Profit sharing adjustments related to mining royalties | 29.2
Penalties on disputed royalties | $ 6,200,000

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- Definition The amount of disputed royalties for december 2006 through september 2011 recognized during the reporting period. + References No definition available. + Details
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- Definition The amount of net asset tax relating to royalties recognized during the reporting period. + References No definition available. + Details
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- Definition The amount of penalties on disputed royalties recognized during the reporting period. + References No definition available. + Details
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- Definition The amount of profit sharing adjustments related to mining royalties recognized during the reporting period. + References No definition available. + Details
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