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14. INCOME TAXES (Details 2) - USD ($)
Jun. 30, 2015
Dec. 31, 2014
Income Tax Disclosure [Abstract]    
Deferred tax liabilities    
Deferred tax assets:    
Allowance for obsolete and slow-moving inventories $ 865 $ 864
Impairment on property, plant and equipment 477,836 477,427
Exploration costs 2,036,448 1,952,990
Compensation costs of unexercised stock options 618,382 1,427,296
US federal net operating loss 9,946,898 9,692,379
Total deferred tax assets 13,080,429 13,550,956
Valuation allowance (10,565,280) (11,119,675)
Net deferred tax asset 2,515,149 2,431,281
Current deferred tax asset 865 864
Long-term deferred tax asset $ 2,514,284 $ 2,430,417