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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

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