XML 46 R61.htm IDEA: XBRL DOCUMENT v2.4.0.8
INCOME TAXES: (Details 5) (USD $)
 12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
Peru
Dec. 31, 2012
Peru
Dec. 31, 2011
Peru
Dec. 31, 2013
Peru
Minimum
Dec. 31, 2013
Peru
Maximum
Dec. 31, 2013
United States
Minera Mexico
Jan. 02, 2014
Mexican Operations
Dec. 31, 2013
Mexican Operations
Jan. 02, 2014
Mexican Operations
Minimum
Jan. 02, 2014
Mexican Operations
Maximum
Income Taxes                          
Excess of financial reporting over tax basis for stock in subsidiary                 $ 4,400,000,000        
Deferred tax liability potentially remitted foreign earnings                 7,400,000        
Foreign earnings potentially repatriated                 76,200,000        
Special mine tax (as a percent)             2.00% 8.40%          
Operating income margin (as a percent)               10.00%          
Increment in operating income margin (as a percent)             5.00% 85.00%          
Increase in special mining tax rate for each 5% increase up to 85% increase in operating income margin (as a percent)       0.40%                  
Provision for special mining tax       25,500,000 49,600,000 16,400,000              
Mining royalty tax (as a percent)                   7.50%      
Additional royalty tax over gross income from sales of gold, silver and platinum (as a percent)                   0.50%      
Depreciation of exploration expenses per year (as a percent)                   10.00% 100.00%    
Withholding on dividends distributed to individuals or foreign residents (as a percent)                   10.00%      
Deductions for tax-exempt salaries and for contributions to pension plans (as a percent)                       47.00% 53.00%
Mexican statutory tax rate (as a percent)                   30.00%      
Recognised deferred income tax charge (97,188,000) 55,807,000 (117,946,000)               34,700,000    
Unrecognized tax benefits 221,200,000 221,200,000 70,600,000 0             0    
Changes in unrecognized tax benefits                          
Unrecognized tax benefits, opening balance 221,200,000 70,600,000 75,700,000             0      
Gross increases tax positions in prior period   39,700,000 21,600,000                    
Gross decreases tax positions in prior period   200,000 (26,800,000)                    
Gross increases current-period tax positions   110,700,000 100,000                    
Net increase / decrease   150,600,000 (5,100,000)                    
Unrecognized tax benefits, ending balance 221,200,000 221,200,000 70,600,000 0             0    
Amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate 221,200,000 221,200,000                      
Accrued interest and penalties included in liability for uncertain tax positions   $ 0 $ 0