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CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
NET REVENUE    
Net revenue $ 101,700,882 $ 164,980,453
OPERATING INCOME /EXPENSES    
Cost of net revenue (73,439,341) (89,538,212)
Sales, marketing and other operating expenses (82,004) (86,936)
Research and development cost (164,586) (398,842)
Exploration costs 0 (7,034,153)
Write-off/Impairment on property, plant and equipment (1,042,138) (7,570,566)
General and administrative expenses (6,792,110) (17,874,296)
Other operating income 304,152 1,821,010
Total Costs and Expenses (81,216,027) (120,681,995)
INCOME FROM OPERATIONS 20,484,855 44,298,458
OTHER INCOME (EXPENSE)    
Interest expense (210,705) (212,441)
Interest income 312,806 269,614
Other income (expense) total 102,101 57,173
INCOME BEFORE TAXES 20,586,956 44,355,631
INCOME TAXES (5,591,453) (13,402,871)
NET INCOME 14,995,503 30,952,760
COMPREHENSIVE INCOME:    
Net income 14,995,503 30,952,760
OTHER COMPREHENSIVE INCOME    
Foreign currency translation adjustments 733,013 12,493,402
COMPREHENSIVE INCOME $ 15,728,516 $ 43,446,162
EARNINGS PER SHARE:    
BASIC $ 0.43 $ 0.89
DILUTED $ 0.43 $ 0.89
WEIGHTED AVERAGE NUMBER OF SHARES:    
BASIC 34,706,356 34,660,866
DILUTED 35,067,950 34,673,615