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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