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14. INCOME TAXES (Details 2) - USD ($)
Dec. 31, 2015
Dec. 31, 2014
Income Tax Disclosure [Abstract]    
Deferred tax liabilities $ 0 $ 0
Deferred tax assets:    
Allowance for obsolete and slow-moving inventories 3,173 864
Impairment on property, plant and equipment 449,879 477,427
Exploration costs 1,917,301 1,952,990
Compensation costs of unexercised stock options 629,162 1,427,296
US federal net operating loss 10,835,000 10,382,000
Total deferred tax assets 13,834,515 14,240,577
Valuation allowance (11,464,162) (11,809,296)
Net deferred tax asset 2,370,353 2,431,281
Current deferred tax asset 3,173 864
Long-term deferred tax asset $ 2,367,180 $ 2,430,417