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15. INCOME TAXES (Details 2) (USD $)
Dec. 31, 2012
Dec. 31, 2011
Income Tax Disclosure [Abstract]    
Deferred tax liabilities $ 0 $ 0
Allowance for obsolete and slow-moving inventories 6,973 3,718
Impairment on property, plant and equipment 464,778 639,031
Exploration costs 1,781,921 1,797,391
Repair and maintenance costs    224,984
Property, plant and equipment    81,060
Property, plant and equipment under capital leases    (8,001)
Compensation costs of unexercised stock options 1,809,378 1,635,809
US federal net operating loss 8,809,935 8,476,012
Total deferred tax assets 12,872,984 12,850,004
Valuation allowance (10,619,313) (10,111,821)
Net deferred tax asset 2,253,672 2,738,183
Current deferred tax asset 6,973 228,702
Long-term deferred tax asset $ 2,246,699 $ 2,509,481