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13. INCOME TAXES (Restated) (Details 2) - USD ($)	Mar. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Deferred tax liabilities	$ 0	$ 0
Deferred tax assets:
Allowance for obsolete and slow-moving inventories	1,368	10,980
Impairment on property, plant and equipment	4,076,604	4,610,228
Exploration costs	1,979,924	1,905,347
Compensation costs of unexercised stock options	98,088	98,092
PRC tax losses	1,931,983	0
US federal net operating loss	27,100	0
Total deferred tax assets	8,115,067	6,624,647
Valuation allowance	(125,188)	(98,092)
Net deferred tax asset	$ 7,989,879	$ 6,526,555

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