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14. INCOME TAXES (Details 2) (USD $) | Mar. 31, 2015 | Dec. 31, 2014
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Income Tax Disclosure [Abstract] |  |
Deferred tax liabilities | $ 0 us-gaap_DeferredTaxLiabilities | $ 0 us-gaap_DeferredTaxLiabilities
Allowance for obsolete and slow-moving inventories | 861 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReturnsAndAllowances | 864 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReturnsAndAllowances
Impairment on property, plant and equipment | 475,616 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsImpairmentLosses | 477,427 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsImpairmentLosses
Exploration costs | 2,026,986 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther | 1,952,990 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther
Compensation costs of unexercised stock options | 539,754 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost | 1,427,296 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
US federal net operating loss | 9,816,518 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic | 9,692,379 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic
Total deferred tax assets | 12,859,735 us-gaap_DeferredTaxAssetsGross | 13,550,956 us-gaap_DeferredTaxAssetsGross
Valuation allowance | (10,356,273)us-gaap_DeferredTaxAssetsValuationAllowance | (11,119,675)us-gaap_DeferredTaxAssetsValuationAllowance
Net deferred tax asset | 2,503,462 us-gaap_DeferredTaxAssetsLiabilitiesNet | 2,431,281 us-gaap_DeferredTaxAssetsLiabilitiesNet
Current deferred tax asset | 861 us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent | 864 us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent
Long-term deferred tax asset | $ 2,502,601 us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent | $ 2,430,417 us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible domestic operating loss carryforwards. Excludes state and local operating loss carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from share-based compensation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 + Details
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