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14. INCOME TAXES (Details 2) - USD ($) | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Income Tax Disclosure [Abstract] |  |
Deferred tax liabilities | $ 0 | $ 0
Deferred tax assets: |  |
Allowance for obsolete and slow-moving inventories | 0 | 16,292
Impairment on property, plant and equipment | 3,525,701 | 3,696,332
Impairment on prepaid land lease | 838,671 | 840,284
Exploration costs | 1,810,977 | 1,813,965
Compensation costs of unexercised stock options | 171,672 | 194,016
PRC tax losses | 14,555,918 | 12,663,985
US federal net operating loss | 486,290 | 119,000
Total deferred tax assets | 21,389,229 | 19,343,874
Valuation allowance | (657,962) | (313,016)
Net deferred tax asset | $ 20,731,267 | $ 19,030,858

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