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14. INCOME TAXES (Details 2) - USD ($)
Dec. 31, 2016
Dec. 31, 2015
Income Tax Disclosure [Abstract]    
Deferred tax liabilities $ 0 $ 0
Deferred tax assets:    
Allowance for obsolete and slow-moving inventories 0 3,173
Impairment on property, plant and equipment 421,106 449,879
Exploration costs 1,794,667 1,917,301
Compensation costs of unexercised stock options 120,986 629,162
US federal net operating loss 11,575,000 10,835,000
Total deferred tax assets 13,911,759 13,834,515
Valuation allowance (11,695,986) (11,464,162)
Net deferred tax asset 2,215,773 2,370,353
Current deferred tax asset 0 3,173
Long-term deferred tax asset $ 2,215,772 $ 2,367,180