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14. INCOME TAXES (Details 2) - USD ($)
Dec. 31, 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 2,974,542 3,696,332
Impairment on prepaid land lease 826,673 840,284
Exploration costs 1,784,583 1,813,965
Compensation costs of unexercised stock options 171,672 194,016
PRC tax losses 18,737,005 12,663,985
US federal net operating loss 432,000 119,000
Total deferred tax assets 24,926,475 19,343,874
Valuation allowance (8,985,833) (313,016)
Net deferred tax asset $ 15,940,642 $ 19,030,858