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15. INCOME TAXES (Details 2) (USD $) | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Income Tax Disclosure [Abstract] |  |
Deferred tax liabilities | $ 0 | $ 0
Allowance for obsolete and slow-moving inventories | 1,657 | 6,973
Impairment on property, plant and equipment | 479,151 | 464,778
Exploration costs | 1,837,025 | 1,781,921
Repair and maintenance costs | 0 | 0
Property, plant and equipment | 0 | 0
Property, plant and equipment under capital leases | 0 | 0
Compensation costs of unexercised stock options | 2,053,310 | 1,809,378
US federal net operating loss | 9,272,734 | 8,809,935
Total deferred tax assets | 13,643,877 | 12,872,985
Valuation allowance | (11,326,044) | (10,619,313)
Net deferred tax asset | 2,317,833 | 2,253,672
Current deferred tax asset | 1,657 | 6,973
Long-term deferred tax asset | $ 2,316,176 | $ 2,246,699

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