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13. INCOME TAXES (Details 2) (USD $)
Jun. 30, 2013
Dec. 31, 2012
Jun. 30, 2012
Income Tax Disclosure [Abstract]      
Deferred tax liabilities $ 0   $ 0
Deferred tax assets:      
Allowance for obsolete and slow-moving inventories 7,094   6,973
Impairment on property, plant and equipment 472,812   464,778
Exploration costs 1,812,721   1,781,921
Compensation costs of unexercised stock options 1,990,360   1,809,378
US federal net operating loss 8,876,646   8,809,935
Total deferred tax assets 13,159,633   12,872,985
Valuation allowance (10,867,006)   (10,619,313)
Net deferred tax asset 2,292,627   2,253,672
Current deferred tax asset 7,094   6,973
Long-term deferred tax asset $ 2,285,533 $ 2,246,699 $ 2,246,699