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14. INCOME TAXES (Details 2) - USD ($)
Jun. 30, 2016
Dec. 31, 2015
Income Tax Disclosure [Abstract]    
Deferred tax liabilities $ 0 $ 0
Deferred tax assets:    
Allowance for obsolete and slow-moving inventories 3,108 3,173
Impairment on property, plant and equipment 440,531 449,879
Exploration costs 1,877,459 1,917,301
Compensation costs of unexercised stock options 475,442 629,162
US federal net operating loss 10,888,570 10,835,000
Total deferred tax assets 13,685,110 13,834,515
Valuation allowance (11,364,012) (11,464,162)
Net deferred tax asset 2,321,098 2,370,353
Current deferred tax asset 0 3,173
Long-term deferred tax asset $ 2,321,098 $ 2,367,180