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CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME (USD $)
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
NET REVENUE      
Net revenue $ 164,980,453 $ 158,335,023 $ 110,276,908
OPERATING EXPENSES / INCOME      
Cost of net revenue (89,538,212) (80,254,759) (62,697,871)
Sales, marketing and other operating expenses (86,936) (136,364) (21,712)
Research and development cost (398,842) (2,200,291) (500,406)
Exploration costs (7,034,153)    
Write-off / Impairment on property, plant and equipment (7,570,566)    
General and administrative expenses (17,874,296) (6,871,091) (5,344,833)
Other operating income 1,821,010 223,715  
Costs and Expenses (120,681,995) (89,238,790) (68,564,822)
INCOME FROM OPERATIONS 44,298,458 69,096,233 41,712,086
OTHER INCOME (EXPENSES)      
Interest expense (212,441) (1,052) (17,078)
Interest income 269,614 242,988 80,805
Nonoperating Income (Expense), Total 57,173 241,936 63,727
INCOME BEFORE TAXES 44,355,631 69,338,169 41,775,813
INCOME TAXES (13,402,871) (18,054,849) (11,184,398)
NET INCOME 30,952,760 51,283,320 30,591,415
COMPREHENSIVE INCOME:      
Net income 30,952,760 51,283,320 30,591,415
OTHER COMPREHENSIVE INCOME      
- Foreign currency translation adjustments 12,493,402 5,110,249 (183,595)
COMPREHENSIVE INCOME $ 43,446,162 $ 56,393,569 $ 30,407,820
EARNINGS PER SHARE      
BASIC $ 0.89 $ 1.48 $ 1.00
DILUTED $ 0.89 $ 1.48 $ 1.00
WEIGHTED AVERAGE NUMBER OF SHARES      
BASIC 34,660,866 34,614,667 30,698,824
DILUTED 34,673,615 34,675,329 30,701,697