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12. INCOME TAXES (Details 2) - USD ($)	Sep. 30, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Deferred tax liabilities	$ 0	$ 0
Deferred tax assets:
Allowance for obsolete and slow-moving inventories	0	10,980
Impairment on property, plant and equipment	3,773,740	4,610,228
Exploration costs	1,809,857	1,905,347
Compensation costs of unexercised stock options	94,287	98,092
PRC tax losses	10,559,743	0
US federal net operating loss	83,400	0
Total deferred tax assets	16,321,027	6,624,647
Valuation allowance	(177,687)	(98,092)
Net deferred tax asset	$ 16,143,340	$ 6,526,555

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