Long-term Reclamation Liability and Retirement Obligation Asset (Tables) |
12 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Dec. 31, 2018 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Asset Retirement Obligation Disclosure [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Schedule of Other Noncurrent Liabilities | Following is a reconciliation of the aggregate retirement liability associated with our reclamation plan for the mining projects for the years ended December 31, 2018, 2017 and 2016:
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Schedule of Asset Retirement Obligations | Following is a reconciliation of the aggregate retirement obligation asset associated with our mining projects for the years ended December 31, 2018, 2017 and 2016:
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