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13. INCOME TAXES (Details 2) (USD $) | Sep. 30, 2013 | Dec. 31, 2012
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Income Tax Disclosure [Abstract] |  |
Deferred tax liabilities | $ 0 | $ 0
Allowance for obsolete and slow-moving inventories | 7,129 | 6,973
Impairment on property, plant and equipment | 475,149 | 464,778
Exploration costs | 1,821,681 | 1,781,921
Compensation costs of unexercised stock options | 1,991,754 | 1,809,378
US federal net operating loss | 8,953,846 | 8,809,935
Total deferred tax assets | 13,249,559 | 12,872,985
Valuation allowance | (10,945,600) | (10,619,313)
Net deferred tax asset | 2,303,959 | 2,253,672
Current deferred tax asset | 7,129 | 6,973
Long-term deferred tax asset | $ 2,296,830 | $ 2,246,699

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