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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Deferred tax assets:    
Loss carryovers $ 12,178 $ 8,168
Investment in Mineral Property 1,952
Capitalized Exploration Costs 1,205
Stock option compensation expense 13
Royalty 989 1,482
Unrealized loss on derivative securities 28
Other 135 105
Valuation allowance (16,249) (9,118)
Total deferred tax assets 251 637
Deferred tax liabilities:    
Unrealized gain on derivative securities 196
Unrealized gains on marketable equity securities 230 395
Other 21 46
Total deferred tax liabilities 251 637
Net deferred tax liabilities