Retirement Obligation Asset (Tables) |
6 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Jun. 30, 2018 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Asset Retirement Obligation Disclosure [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Reconciliation of the Aggregate Retirement Obligation Asset | Following is a reconciliation of the aggregate retirement obligation asset associated with our reclamation plan for our mining projects:
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