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13. INCOME TAXES (Details 2) (USD $) | Mar. 31, 2014 | Dec. 31, 2013
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Income Tax Disclosure [Abstract] |  |
Deferred tax liabilities | $ 0 | $ 0
Allowance for obsolete and slow-moving inventories | 1,642 | 1,657
Impairment on property, plant and equipment | 474,857 | 479,151
Exploration costs | 1,820,561 | 1,837,025
Compensation costs of unexercised stock options | 1,799,910 | 2,053,310
US federal net operating loss | 9,546,338 | 9,272,734
Total deferred tax assets | 13,643,308 | 13,643,877
Valuation allowance | (11,346,248) | (11,326,044)
Net deferred tax asset | 2,297,060 | 2,317,833
Current deferred tax asset | 1,642 | 1,657
Long-term deferred tax asset | $ 2,295,418 | $ 2,316,176

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