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Other Financial Liabilities (debt) (Tables) | 12 Months Ended
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Dec. 31, 2017
Sociedad Minera El Brocal S.A.A. [Member] |
Disclosure Of Other Financial Liabilities debt [Line Items] |
Disclosure Of Borrowings Explanatory [Table Text Block] | This item is made up as follows:
|  | December 31, |  | December 31, |
|  | 2017 |  | 2016 |
|  | US$(000) |  | US$(000) |
Current debt |  |  |  |  |  |  |
Leases |  |  | - |  |  | 161 |
Non-current debt |  |  |  |  |  |  |
Senior unsecured credit facility (a) |  |  | 1,280,000 |  |  | 1,400,000 |
Less : Debt issuance cost |  |  | (11,512) |  |  | (10,171) |
Senior unsecured credit facility, net |  |  | 1,268,488 |  |  | 1,389,829 |
Shareholder loans (b) |  |  | - |  |  | 606,014 |
Total non-current debt |  |  | 1,268,488 |  |  | 1,995,843 |
Total other financial liabilities |  |  | 1,268,488 |  |  | 1,996,004 |
| (a) | In March 2014, the Company entered into a five-year, US$1.8 billion senior unsecured credit facility with several banks led by Citibank N.A. as the administrative agent. The disbursements were mainly used to finance a portion of the Company´s expansion project. As of March 31, 2017, the Company had repaid US$525 million of the credit facility.
In June 2017, the Company entered into an amendment to the senior unsecured credit facility, which extends the maturity and increased the outstanding amount by US$225 million. After the amendment the balance of the total credit facility was US$1.5 billion. In December 2017, the Company repaid US$220 million. The balance of the total credit facility is US$1.3 billion as of December 31, 2017. The credit facility calls for amortization in four installments, with 15% of the total facility due on December 31, 2020 (US$5.0 million after the December 2017 repayment), 15% due on June 30, 2021 (US$225 million), 35% due on December 31, 2021 (US$525 million) and 35% due on June 19, 2022 (US$525 million). Interest on the credit facility is based on London Interbank Offered Rate (LIBOR) plus a spread (currently 1.9%) based on the Company´s total net debt to earnings before interest, taxes, depreciation and amortization (EBITDA) ratio, as defined in the agreement. As of result of the amended credit facility, the Company recognized charges of US$4.3 million to write off debt issuance costs and a charge of US$2.0 million for issuance costs related to debt extinguishment caused by the early December payment in the 2017 statements of comprehensive income (see Note 19). No letters of credit were issued and there are no guarantees provided for the credit facility as of December 31, 2017. Restrictive Covenants - The senior unsecured credit facility contains certain financial ratios that the Company must comply with on a quarterly basis, including a total net debt to EBITDA ratio and an interest coverage ratio, which are defined by the agreement. As of December 31, 2017, the Company was in compliance with all of its covenants.
| (b) | In December 2014, the Company entered into shareholder loan agreements with, or affiliates of, FMC, Buenaventura and Sumitomo. During 2017, the Company repaid the outstanding balances of the shareholders loans, partly with proceeds from the amended senior unsecured credit facility discussed above.
Following is the movement of the changes derived from the financing activities for the year ended December 31, 2017:
|  | January 01, |  |  |  |  |  | December 31, |
|  | 2017 |  | Net Cash Flow |  | Others |  | 2017 |
|  | US$(000) |  | US$(000) |  | US$(000) |  | US$(000) |
Current: |  |  |  |  |  |  |  |  |  |  |  |  |
Leases |  |  | 161 |  |  | (161) |  |  | - |  |  | - |
Non-current: |  |  |  |  |  |  |  |  |  |  |  |  |
Senior unsecured credit facility |  |  | 1,400,000 |  |  | (120,000) |  |  | - |  |  | 1,280,000 |
Shareholder loans |  |  | 606,014 |  |  | (606,014) |  |  | - |  |  | - |
Debt issuance cost |  |  | (10,171) |  |  | (12,085) |  |  | 10,744 |  |  | (11,512) |
|  |  | 1,995,843 |  |  | (738,099) |  |  | 10,744 |  |  | 1,268,488 |
Total liabilities from financing activities |  |  | 1,996,004 |  |  | (738,260) |  |  | 10,744 |  |  | 1,268,488 |
Following is the movement of the changes derived from the financing activities for the year ended December 31, 2016:
|  | January 01, 2016 |  | Net Cash Flow |  | Others |  | December 31, 2016 |
|  | US$(000) |  | US$(000) |  | US$(000) |  | US$(000) |
Current: |  |  |  |  |  |  |  |  |  |  |  |  |
Promissory notes |  |  | 43,000 |  |  | (43,000) |  |  | - |  |  | - |
Leases |  |  | 330 |  |  | (169) |  |  | - |  |  | 161 |
|  |  | 43,330 |  |  | (43,169) |  |  | - |  |  | 161 |
Non-current: |  |  |  |  |  |  |  |  |  |  |  |  |
Senior unsecured credit facility |  |  | 1,800,000 |  |  | (400,000) |  |  | - |  |  | 1,400,000 |
Shareholder loans |  |  | 600,907 |  |  | - |  |  | 5,107 |  |  | 606,014 |
Debt issuance cost |  |  | (19,072) |  |  | - |  |  | 8,901 |  |  | (10,171) |
|  |  | 2,381,835 |  |  | (400,000) |  |  | 14,008 |  |  | 1,995,843 |
Total liabilities from financing activities |  |  | 2,425,165 |  |  | (443,169) |  |  | 14,008 |  |  | 1,996,004 |
Following is the movement of the changes derived from the financing activities for the year ended December 31, 2015:
|  | January 01, 2015 |  | Net Cash Flow |  | Others |  | December 31, 2015 |
|  | US$(000) |  | US$(000) |  | US$(000) |  | US$(000) |
Current: |  |  |  |  |  |  |  |  |  |  |  |  |
Promissory notes |  |  | 50,000 |  |  | (7,000) |  |  | - |  |  | 43,000 |
Leases |  |  | 493 |  |  | (163) |  |  | - |  |  | 330 |
|  |  | 50,493 |  |  | (7,163) |  |  | - |  |  | 43,330 |
Non-current: |  |  |  |  |  |  |  |  |  |  |  |  |
Senior unsecured credit facility |  |  | 425,000 |  |  | 1,375,000 |  |  | - |  |  | 1,800,000 |
Shareholder loans |  |  | - |  |  | 600,000 |  |  | 907 |  |  | 600,907 |
Debt issuance cost |  |  | (22,643) |  |  | (2,356) |  |  | 5,927 |  |  | (19,072) |
|  |  | 402,357 |  |  | 1,972,644 |  |  | 6,831 |  |  | 2,381,835 |
Total liabilities from financing activities |  |  | 452,850 |  |  | 1,965,481 |  |  | 6,831 |  |  | 2,425,165 |

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