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Prepaid Expenses and Other Current Assets - Schedule of Prepaid Expenses and Other Current Assets (Details) - USD ($)
Mar. 31, 2019
Dec. 31, 2018
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]    
Land and property deposits (Note 15) $ 2,100,000 $ 1,800,000
Surety bond and insurance 342,758 475,861
Reimbursements due from Tonogold 119,541 82,951
Other 312,543 353,390
Total prepaid expenses and other current assets $ 2,874,842 $ 2,712,202