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14. INCOME TAXES (Details 2) - USD ($)	Mar. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Deferred tax liabilities	$ 0	$ 0
Deferred tax assets:
Allowance for obsolete and slow-moving inventories	16,607	16,292
Impairment on property, plant and equipment	3,675,218	3,696,332
Impairment on prepaid land lease	856,490	840,284
Exploration costs	1,848,950	1,813,965
Compensation costs of unexercised stock options	179,957	194,016
PRC tax losses	14,398,399	12,663,985
US federal net operating loss	148,000	119,000
Total deferred tax assets	21,123,621	19,343,874
Valuation allowance	(327,957)	(313,016)
Net deferred tax asset	$ 20,795,664	$ 19,030,858

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