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14. INCOME TAXES (Details 2) - USD ($) | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Income Tax Disclosure [Abstract] |  |
Deferred tax liabilities | $ 0 | $ 0
Deferred tax assets: |  |
Allowance for obsolete and slow-moving inventories | 16,607 | 16,292
Impairment on property, plant and equipment | 3,675,218 | 3,696,332
Impairment on prepaid land lease | 856,490 | 840,284
Exploration costs | 1,848,950 | 1,813,965
Compensation costs of unexercised stock options | 179,957 | 194,016
PRC tax losses | 14,398,399 | 12,663,985
US federal net operating loss | 148,000 | 119,000
Total deferred tax assets | 21,123,621 | 19,343,874
Valuation allowance | (327,957) | (313,016)
Net deferred tax asset | $ 20,795,664 | $ 19,030,858

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