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FINANCING: (Details) (USD $) | 12 Months Ended | 89 Months Ended
--- | --- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Nov. 30, 2012 item
FINANCING |  |  |  |
Total debt | $ 4,204,900,000 | $ 4,213,900,000 |  |
Less, current portion |  | (10,000,000) |  |
Total long-term debt | 4,204,915,000 | 4,203,863,000 |  |
Face amount of debt |  |  |  | 4,200,000,000
Number of times for which senior unsecured notes were issued |  |  |  | 6
Debt issuance cost capitalized | 26,100,000 | 25,900,000 |  |
Amortization charged to interest expense | 1,900,000 | 1,300,000 | 500,000 |
Percentage of principal amount at which notes may be required to be repurchased in event of change of control in the entity | 101.00% |  |  |
Minimum |  |  |  |
FINANCING |  |  |  |
Number of rating agencies that could cause a change of control triggering event | 1 |  |  |
Number of decreased gradations that could cause a change of control triggering event | 1 |  |  |
1.763% Mitsui credit agreement due 2013 |  |  |  |
FINANCING |  |  |  |
Total debt |  | 10,000,000 |  |
Face amount of debt |  | 100,000,000 |  |
Interest rate (as a percent) | 1.763% |  |  |
Volume of copper on pledged receivables (in tons) | 31,000 |  |  |
6.375% Senior unsecured notes due 2015 |  |  |  |
FINANCING |  |  |  |
Total debt | 199,700,000 | 199,600,000 |  |
Face amount of debt | 200,000,000 |  |  |
Interest rate (as a percent) | 6.375% |  |  |
5.375% Senior unsecured notes due 2020 |  |  |  |
FINANCING |  |  |  |
Total debt | 398,600,000 | 398,400,000 |  |
Face amount of debt | 400,000,000 |  |  |
Interest rate (as a percent) | 5.375% |  |  |
3.500% Senior unsecured notes due 2022 |  |  |  |
FINANCING |  |  |  |
Total debt | 299,100,000 | 299,000,000 |  |
Face amount of debt | 300,000,000 |  |  |
Interest rate (as a percent) | 3.50% |  |  |
6.750% Senior unsecured notes due 2040 |  |  |  |
FINANCING |  |  |  |
Total debt | 1,092,100,000 | 1,092,000,000 |  |
Face amount of debt | 1,100,000,000 |  |  |
Interest rate (as a percent) | 6.75% |  |  |
5.250% Senior unsecured notes due 2042 |  |  |  |
FINANCING |  |  |  |
Total debt | 1,178,800,000 | 1,178,500,000 |  |
Face amount of debt | 1,200,000,000 |  |  |
Interest rate (as a percent) | 5.25% |  |  |
9.250% Yankee Bonds due 2028 |  |  |  |
FINANCING |  |  |  |
Total debt | 51,100,000 | 51,100,000 |  |
Face amount of debt | 125,000,000 |  |  |
Interest rate (as a percent) | 9.25% |  |  |
9.250% Yankee Bonds due 2028 | Minera Mexico | Minimum |  |  |  |
FINANCING |  |  |  |
Ratio of EBITDA to interest expense | 2.5 |  |  |
7.500% Senior unsecured notes due 2035 |  |  |  |
FINANCING |  |  |  |
Total debt | 985,500,000 | 985,300,000 |  |
Face amount of debt | 1,000,000,000 |  |  |
Interest rate (as a percent) | 7.50% |  |  |
Debt issuance cost capitalized | $ 28,900,000 |  |  |

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