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Subsidiaries with material non-controlling interest (Tables) | 12 Months Ended
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Dec. 31, 2018
Disclosure Of Subsidiaries with material non-controlling interest [Abstract] |
Disclosure of non-controlling interests [text block] |
| (a) | Financial information of main subsidiaries that have material non-controlling interest are provided below:
|  | Country of incorporation and operation |  | 2018 |  |  | 2017 |  |  | 2016 |
|  |  |  | % |  |  | % |  |  | % |
Equity interest held by non-controlling interests: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sociedad Minera El Brocal S.A.A. |  | Peru |  |  | 38.57 |  |  |  | 38.57 |  |  |  | 38.67 |
S.M.R.L. Chaupiloma Dos de Cajamarca |  | Peru |  |  | 40.00 |  |  |  | 40.00 |  |  |  | 40.00 |
Minera La Zanja S.R.L. |  | Peru |  |  | 46.94 |  |  |  | 46.94 |  |  |  | 46.94 |
Apu Coropuna S.R.L. |  | Peru |  |  | 30.00 |  |  |  | 30.00 |  |  |  | 30.00 |
|  | 2018 |  |  | 2017 |  |  | 2016 |
|  | US$(000) |  |  | US$(000) |  |  | US$(000) |
Accumulated balances of material non-controlling interest: |  |  |  |  |  |  |  |  |  |  |  |
Sociedad Minera El Brocal S.A.A. |  |  | 176,978 |  |  |  | 165,032 |  |  |  | 167,986 |
Minera La Zanja S.R.L. |  |  | 42,295 |  |  |  | 48,642 |  |  |  | 55,613 |
S.M.R.L. Chaupiloma Dos de Cajamarca |  |  | 1,800 |  |  |  | 1,693 |  |  |  | 1,906 |
Apu Coropuna S.R.L. |  |  | 164 |  |  |  | 223 |  |  |  | 678 |
Other minor |  |  | - |  |  |  | - |  |  |  | (61 | )
|  |  | 221,237 |  |  |  | 215,590 |  |  |  | 226,122 |
Profit (loss) allocated to material non-controlling interest: |  |  |  |  |  |  |  |  |  |  |  |
S.M.R.L. Chaupiloma Dos de Cajamarca |  |  | 5,667 |  |  |  | 5,827 |  |  |  | 6,950 |
Sociedad Minera El Brocal S.A.A. |  |  | 2,880 |  |  |  | 4,246 |  |  |  | (13,426 | )
Minera La Zanja S.R.L. |  |  | (6,346 | ) |  |  | (6,006 | ) |  |  | 2,342 |
Apu Coropuna S.R.L. |  |  | (410 | ) |  |  | (454 | ) |  |  | (157 | )
Other minor |  |  | - |  |  |  | (1 | ) |  |  | (31 | )
|  |  | 1,791 |  |  |  | 3,612 |  |  |  | (4,322 | )
Disclosure of financial position of subsidiaries [text block] |
| (b) | The summarized financial information of these subsidiaries, before inter-company eliminations, is presented below:
Statements of financial position as of December 31, 2018:
|  | Sociedad Minera El Brocal S.A.A. |  |  | Minera La Zanja S.R.L. |  |  | S.M.R.L. Chaupiloma Dos de Cajamarca |  |  | Apu Coropuna S.R.L. |  |  | Other minor |
|  | US$(000) |  |  | US$(000) |  |  | US$(000) |  |  | US$(000) |  |  | US$(000) |
Current assets |  |  | 170,274 |  |  |  | 126,878 |  |  |  | 7,154 |  |  |  | 2,263 |  |  |  | - |
Non-current assets |  |  | 603,280 |  |  |  | 31,841 |  |  |  | - |  |  |  | 182 |  |  |  | - |
Current liabilities |  |  | (123,052 | ) |  |  | (25,834 | ) |  |  | (2,653 | ) |  |  | (1,165 | ) |  |  | - |
Non-current liabilities |  |  | (217,683 | ) |  |  | (42,781 | ) |  |  | - |  |  |  | (740 | ) |  |  | - |
Total shareholders’ equity, net |  |  | 432,819 |  |  |  | 90,104 |  |  |  | 4,501 |  |  |  | 540 |  |  |  | - |
Attributable to: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholders of the Group |  |  | 255,841 |  |  |  | 47,808 |  |  |  | 2,701 |  |  |  | 377 |  |  |  | - |
Non-controlling interests |  |  | 176,978 |  |  |  | 42,296 |  |  |  | 1,800 |  |  |  | 163 |  |  |  | - |
|  |  | 432,819 |  |  |  | 90,104 |  |  |  | 4,501 |  |  |  | 540 |  |  |  | - |
Statements of financial position as of December 31, 2017:
|  | Sociedad Minera El Brocal S.A.A. |  |  | Minera La Zanja S.R.L. |  |  | S.M.R.L. Chaupiloma Dos de Cajamarca |  |  | Apu Coropuna S.R.L. |  |  | Other minor |
|  | US$(000) |  |  | US$(000) |  |  | US$(000) |  |  | US$(000) |  |  | US$(000) |
Current assets |  |  | 146,865 |  |  |  | 134,758 |  |  |  | 6,640 |  |  |  | 1,440 |  |  |  | 665 |
Non-current assets |  |  | 645,729 |  |  |  | 55,873 |  |  |  | - |  |  |  | 189 |  |  |  | 30 |
Current liabilities |  |  | (159,190 | ) |  |  | (38,807 | ) |  |  | (2,407 | ) |  |  | (143 | ) |  |  | (29 | )
Non-current liabilities |  |  | (229,709 | ) |  |  | (48,201 | ) |  |  | - |  |  |  | (740 | ) |  |  | (2 | )
Total shareholders’ equity, net |  |  | 403,695 |  |  |  | 103,623 |  |  |  | 4,233 |  |  |  | 746 |  |  |  | 664 |
Attributable to: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholders of the parent |  |  | 239,925 |  |  |  | 54,981 |  |  |  | 2,540 |  |  |  | 523 |  |  |  | 664 |
Non-controlling interests |  |  | 165,032 |  |  |  | 48,642 |  |  |  | 1,693 |  |  |  | 223 |  |  |  | - |
|  |  | 404,957 |  |  |  | 103,623 |  |  |  | 4,233 |  |  |  | 746 |  |  |  | 664 |
Disclosure of statement of profit or loss of subsidiaries [text block] | Statements of profit or loss for the years 2018, 2017 and 2016:
|  | Sociedad Minera El Brocal S.A.A. |  |  | Minera La Zanja S.R.L. |  |  | S.M.R.L. Chaupiloma Dos de Cajamarca |  |  | Apu Coropuna S.R.L. |  |  | Other minor |
|  | US$(000) |  |  | US$(000) |  |  | US$(000) |  |  | US$(000) |  |  | US$(000) |
Year 2018 - |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  | 332,298 |  |  |  | 96,611 |  |  |  | 20,385 |  |  |  | - |  |  |  | - |
Net profit (loss) |  |  | 6,305 |  |  |  | (13,519 | ) |  |  | 14,168 |  |  |  | (1,369 | ) |  |  | - |
Attributable to non-controlling interests |  |  | 2,880 |  |  |  | (6,346 | ) |  |  | 5,667 |  |  |  | (410 | ) |  |  | - |
Year 2017 - |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  | 322,653 |  |  |  | 165,319 |  |  |  | 20,739 |  |  |  | - |  |  |  | - |
Net profit (loss) |  |  | 10,386 |  |  |  | (12,795 | ) |  |  | 14,568 |  |  |  | (1,515 | ) |  |  | 386 |
Attributable to non-controlling interests |  |  | 4,246 |  |  |  | (6,006 | ) |  |  | 5,827 |  |  |  | (454 | ) |  |  | (1 | )
Year 2016 - |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  | 230,611 |  |  |  | 178,922 |  |  |  | 24,339 |  |  |  | - |  |  |  | - |
Net profit (loss) |  |  | (32,782 | ) |  |  | 4,865 |  |  |  | 17,366 |  |  |  | (523 | ) |  |  | (410 | )
Attributable to non-controlling interests |  |  | (13,426 | ) |  |  | 2,342 |  |  |  | 6,950 |  |  |  | (157 | ) |  |  | (31 | )
Disclosure of cash flow statement [text block] | Statements of cash flow for the years 2018, 2017 and 2016:
|  | Sociedad Minera El Brocal S.A.A. |  |  | Minera La Zanja S.R.L. |  |  | S.M.R.L. Chaupiloma Dos de Cajamarca |  |  | Apu Coropuna S.R.L. |
|  | US$(000) |  |  | US$(000) |  |  | US$(000) |  |  | US$(000) |
Year 2018 - |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating activities |  |  | 74,985 |  |  |  | 10,323 |  |  |  | 14,066 |  |  |  | (572 | )
Investing activities |  |  | (29,546 | ) |  |  | (13,160 | ) |  |  | - |  |  |  | - |
Financing activities |  |  | (29,974 | ) |  |  | - |  |  |  | (13,900 | ) |  |  | - |
|  |  | 15,465 |  |  |  | (2,837 | ) |  |  | 166 |  |  |  | (572 | )
Year 2017 - |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating activities |  |  | 60,525 |  |  |  | 139,155 |  |  |  | 15,093 |  |  |  | (185 | )
Investing activities |  |  | (64,343 | ) |  |  | (17,326 | ) |  |  | - |  |  |  | - |
Financing activities |  |  | 18,096 |  |  |  | (32,077 | ) |  |  | (15,090 | ) |  |  | 1,477 |
|  |  | 14,278 |  |  |  | 89,752 |  |  |  | 3 |  |  |  | 1,292 |
Year 2016 - |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating activities |  |  | (9,151 | ) |  |  | 11,839 |  |  |  | 18,178 |  |  |  | (1,895 | )
Investing activities |  |  | (37,935 | ) |  |  | (14,994 | ) |  |  | - |  |  |  | - |
Financing activities |  |  | 48,021 |  |  |  | - |  |  |  | (18,500 | ) |  |  | 2,717 |
|  |  | 935 |  |  |  | (3,155 | ) |  |  | (322 | ) |  |  | 822 |

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