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13. INCOME TAXES (Details 2) (USD $) | Dec. 31, 2014 | Dec. 31, 2013
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Income Tax Disclosure [Abstract] |  |
Deferred tax liabilities | $ 0 us-gaap_DeferredTaxLiabilities | $ 0 us-gaap_DeferredTaxLiabilities
Deferred tax assets: |  |
Allowance for obsolete and slow-moving inventories | 864 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReturnsAndAllowances | 1,657 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReturnsAndAllowances
Impairment on property, plant and equipment | 477,427 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsImpairmentLosses | 479,151 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsImpairmentLosses
Exploration costs | 1,952,990 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther | 1,837,025 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther
Repair and maintenance costs | 0 us-gaap_DeferredTaxAssetsOther | 0 us-gaap_DeferredTaxAssetsOther
Property, plant and equipment | 0 us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment | 0 us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment
Property, plant and equipment under capital leases | 0 gure_DeferredTaxAssetPropertyPlantAndEquipmentUnderCapitalLeases | 0 gure_DeferredTaxAssetPropertyPlantAndEquipmentUnderCapitalLeases
Compensation costs of unexercised stock options | 1,427,296 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost | 2,053,310 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
US federal net operating loss | 9,692,379 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic | 9,272,734 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic
Total deferred tax assets | 13,550,956 us-gaap_DeferredTaxAssetsGross | 13,643,877 us-gaap_DeferredTaxAssetsGross
Valuation allowance | (11,119,675)us-gaap_DeferredTaxAssetsValuationAllowance | (11,326,044)us-gaap_DeferredTaxAssetsValuationAllowance
Net deferred tax asset | 2,431,281 us-gaap_DeferredTaxAssetsLiabilitiesNet | 2,317,833 us-gaap_DeferredTaxAssetsLiabilitiesNet
Current deferred tax asset | 864 us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent | 1,657 us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent
Long-term deferred tax asset | $ 2,430,417 us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent | $ 2,316,176 us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent

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