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14. INCOME TAXES (Restated) (Details 2) - USD ($)	Dec. 31, 2017	Dec. 31, 2016
Deferred tax assets:
Allowance for obsolete and slow-moving inventories	$ 10,980	$ 0
Impairment on property, plant and equipment	4,610,228	421,105
Exploration costs	1,905,347	1,794,667
Compensation costs of unexercised stock options	98,092	120,986
US federal net operating loss	0	11,575,000
Total deferred tax assets	6,624,647	13,911,758
Valuation allowance	(98,092)	(11,695,986)
Net deferred tax asset	$ 6,526,555	$ 2,215,772

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