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14. INCOME TAXES (Details 2) - USD ($)
Sep. 30, 2015
Dec. 31, 2014
Income Tax Disclosure [Abstract]    
Deferred tax liabilities $ 0 $ 0
Deferred tax assets:    
Allowance for obsolete and slow-moving inventories 831 864
Impairment on property, plant and equipment 459,228 477,427
Exploration costs 1,957,141 1,952,990
Compensation costs of unexercised stock options 621,707 1,427,296
US federal net operating loss 10,013,893 9,692,379
Total deferred tax assets 13,052,800 13,550,956
Valuation allowance (10,635,600) (11,119,675)
Net deferred tax asset 2,417,200 2,431,281
Current deferred tax asset 831 864
Long-term deferred tax asset $ 2,416,369 $ 2,430,417