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13. INCOME TAXES (Details 2) - USD ($) | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Income Tax Disclosure [Abstract] |  |
Deferred tax liabilities | $ 0 | $ 0
Deferred tax assets: |  |
Allowance for obsolete and slow-moving inventories | 0 | 10,980
Impairment on property, plant and equipment | 3,706,211 | 4,610,228
Exploration costs | 1,881,693 | 1,905,347
Compensation costs of unexercised stock options | 94,287 | 98,092
PRC tax losses | 3,820,948 | 0
US federal net operating loss | 7,138,700 | 7,080,000
Total deferred tax assets | 16,641,839 | 13,704,647
Valuation allowance | (7,232,987) | (7,178,092)
Net deferred tax asset | $ 9,408,852 | $ 6,526,555

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