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14. INCOME TAXES (Details 2) - USD ($) | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Income Tax Disclosure [Abstract] |  |
Deferred tax liabilities | $ 0 | $ 0
Deferred tax assets: |  |
Impairment on property, plant and equipment | 2,764,893 | 2,974,542
Impairment on prepaid land lease | 814,620 | 826,673
Exploration costs | 1,758,563 | 1,784,583
Compensation costs of unexercised stock options | 74,883 | 171,672
PRC tax losses | 20,571,271 | 18,737,005
US federal net operating loss and foreign tax credit | 311,000 | 432,000
Total deferred tax assets | 26,295,230 | 24,926,475
Valuation allowance | (8,796,686) | (8,985,833)
Net deferred tax asset | $ 17,498,544 | $ 15,940,642

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