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14. INCOME TAXES (Details 2) - USD ($) | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Income Tax Disclosure [Abstract] |  |
Deferred tax liabilities | $ 0 | $ 0
Deferred tax assets: |  |
Allowance for obsolete and slow-moving inventories | 0 | 0
Impairment on property, plant and equipment | 2,907,548 | 2,974,542
Impairment on prepaid land lease | 883,884 | 826,673
Exploration costs | 1,908,087 | 1,784,583
Compensation costs of unexercised stock options | 74,883 | 171,672
PRC tax losses | 21,643,028 | 18,737,005
US federal net operating loss | 1,045,503 | 432,000
Total deferred tax assets | 28,462,933 | 24,926,475
Valuation allowance | (9,872,706) | (8,985,833)
Net deferred tax asset | $ 18,590,227 | $ 15,940,642

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