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COMMITTMENTS AND CONTINGENCIES: (Details 3) (USD $) | 1 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 30, 2010 | Jun. 30, 2011
Peruvian operations. |  |
Labor matters |  |
Percentage of labor unionized (as a percent) |  | 79.00%
Number of labor unions |  | 8
Number of labor unions represent majority of workers |  | 3
Number of labor unions at each production area represent majority of workers |  | 1
Term of collective bargaining agreement (in years) | 3 |
Percentage of Annual salary increase as per collective bargaining agreement (as a percent) | 5.00% |
Bonus given to each workers as per collective bargaining agreement | $ 6,700 |
Number of workers covered under collective bargaining agreement | 2,000 |
Number of labor unions other than majority workers unions |  | 5
Mexican operations |  |
Labor matters |  |
Percentage of labor unionized (as a percent) |  | 73.00%
Number of labor unions |  | 3
Period of other benefits negotiated under collective bargaining agreement (in years) |  | 2
Mexican operations | Buenavista mine |  |
Labor matters |  |
Number of workers covered under collective bargaining agreement |  | 780
Mine rehabilitation and reconstruction cost |  | 135,300,000
Mine rehabilitation and reconstruction cost capitalized |  | 78,700,000
Mine rehabilitation and reconstruction cost charged to operating cost |  | 56,600,000
Significant total estimated cost of repairs of Buenavista mine |  | 174,000,000
Additional amount to be spent on rehabilitation of Buenavista mine |  | $ 38,700,000
Number of workers operating in mine and plants as well as in growth program |  | 4,800
Original production capacity of copper (in tons) |  | 180,000
Expected production capacity of copper (in tons) |  | 450,000
Investment in growth program |  | 3,700,000,000

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