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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

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