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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

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