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14. INCOME TAXES (Details 2) - USD ($) | Sep. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Income Tax Disclosure [Abstract] |  |
Deferred tax liabilities | $ 0 | $ 0
Deferred tax assets: |  |
Allowance for obsolete and slow-moving inventories | 3,085 | 3,173
Impairment on property, plant and equipment | 437,465 | 449,879
Exploration costs | 1,864,387 | 1,917,301
Compensation costs of unexercised stock options | 106,586 | 629,162
US federal net operating loss | 11,485,000 | 10,835,000
Total deferred tax assets | 13,896,523 | 13,834,515
Valuation allowance | (11,591,586) | (11,464,162)
Net deferred tax asset | 2,304,937 | 2,370,353
Current deferred tax asset | 0 | 3,173
Long-term deferred tax asset | $ 2,304,937 | $ 2,367,180

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