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13. INCOME TAXES (Details 2) - USD ($) | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Income Tax Disclosure [Abstract] |  |
Deferred tax liabilities | $ 0 | $ 0
Deferred tax assets: |  |
Allowance for obsolete and slow-moving inventories | 10,980 | 0
Impairment on property, plant and equipment | 4,610,228 | 421,105
Exploration costs | 1,905,347 | 1,794,667
Compensation costs of unexercised stock options | 98,092 | 120,986
US federal net operating loss | 7,080,000 | 11,575,000
Total deferred tax assets | 13,704,647 | 13,911,758
Valuation allowance | (7,178,092) | (11,695,986)
Net deferred tax asset | 6,526,555 | 2,215,772
Current deferred tax asset | 0 | 0
Long-term deferred tax asset | $ 6,526,555 | $ 2,215,772

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