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14. INCOME TAXES (Details 2) - USD ($)	Jun. 30, 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	3,525,701	3,696,332
Impairment on prepaid land lease	838,671	840,284
Exploration costs	1,810,977	1,813,965
Compensation costs of unexercised stock options	171,672	194,016
PRC tax losses	14,555,918	12,663,985
US federal net operating loss	486,290	119,000
Total deferred tax assets	21,389,229	19,343,874
Valuation allowance	(657,962)	(313,016)
Net deferred tax asset	$ 20,731,267	$ 19,030,858

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