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13. INCOME TAXES (Details 2) - USD ($)	Jun. 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	3,706,211	4,610,228
Exploration costs	1,881,693	1,905,347
Compensation costs of unexercised stock options	94,287	98,092
PRC tax losses	3,820,948	0
US federal net operating loss	7,138,700	7,080,000
Total deferred tax assets	16,641,839	13,704,647
Valuation allowance	(7,232,987)	(7,178,092)
Net deferred tax asset	$ 9,408,852	$ 6,526,555

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