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Depreciation of Non-Mining Assets (Detail)
12 Months Ended
Dec. 31, 2013
Vehicles
 
Property, Plant and Equipment [Line Items]  
Depreciation rate 20.00%
Computers
 
Property, Plant and Equipment [Line Items]  
Depreciation rate 33.30%
Furniture and Equipment
 
Property, Plant and Equipment [Line Items]  
Depreciation rate 10.00%