Restricted Cash (Details Narrative) - USD ($) $ in Millions  | 
Dec. 31, 2020  | 
Dec. 31, 2019  | 
|---|---|---|
| Surety Bond [Member] | ||
| Represents the amount of reclamation obligations, which are required to be covered by surety performance bonding, as of the balance sheet date. | $ 27.8 | $ 29.9 | 
| X | ||||||||||
- References No definition available. 
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- Details 
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