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15. INCOME TAXES (Details 2) (USD $) | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Income Tax Disclosure [Abstract] |  |
Deferred tax liabilities | $ 0 | $ 0
Allowance for obsolete and slow-moving inventories | 6,973 | 3,718
Impairment on property, plant and equipment | 464,778 | 639,031
Exploration costs | 1,781,921 | 1,797,391
Repair and maintenance costs |  | 224,984
Property, plant and equipment |  | 81,060
Property, plant and equipment under capital leases |  | (8,001)
Compensation costs of unexercised stock options | 1,809,378 | 1,635,809
US federal net operating loss | 8,809,935 | 8,476,012
Total deferred tax assets | 12,872,984 | 12,850,004
Valuation allowance | (10,619,313) | (10,111,821)
Net deferred tax asset | 2,253,672 | 2,738,183
Current deferred tax asset | 6,973 | 228,702
Long-term deferred tax asset | $ 2,246,699 | $ 2,509,481

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