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CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
NET REVENUE    
Net revenue $ 162,317,120 $ 113,660,331
OPERATING EXPENSES / INCOME    
Cost of net revenue (109,035,870) (81,737,610)
Sales, marketing and other operating expenses (375,365) (105,588)
Research and development cost (230,590) (134,292)
Exploration cost (325,840) (488,880)
Write-off / Impairment on property, plant and equipment $ (969,638) (673,705)
Loss from disposal of property, plant and equipment (9,866)
General and administrative expenses $ (6,668,838) (7,161,047)
Other operating income 453,731 468,878
Total Costs and Expenses (117,152,410) (89,842,110)
INCOME FROM OPERATIONS 45,164,710 23,818,221
OTHER INCOME (EXPENSES)    
Interest expense (194,036) (203,296)
Interest income 469,271 482,885
Other income/expense 275,235 279,589
INCOME BEFORE TAXES 45,439,945 24,097,810
INCOME TAXES (11,371,908) (6,226,015)
NET INCOME 34,068,037 17,871,795
COMPREHENSIVE INCOME:    
NET INCOME 34,068,037 17,871,795
OTHER COMPREHENSIVE INCOME    
- Foreign currency translation adjustments (21,740,602) (1,077,846)
COMPREHENSIVE INCOME $ 12,327,435 $ 16,793,949
EARNINGS PER SHARE    
BASIC $ 0.75 $ 0.46
DILUTED $ 0.74 $ 0.46
WEIGHTED AVERAGE NUMBER OF SHARES    
BASIC 45,167,288 38,694,567
DILUTED 46,109,404 39,260,627