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Exploration in operating units (Tables) | 12 Months Ended
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Dec. 31, 2017
Disclosure Of Exploration In Operating Units [Abstract] |
Disclosure of detailed information about exploration and evaluation assets [Text Block] | This caption is made up as follows
|  | 2017 |  | 2016 |  | 2015 |
|  | US$(000) |  | US$(000) |  | US$(000) |
Services provided by third parties |  |  | 79,837 |  |  | 78,996 |  |  | 72,613 |
Consumption of materials and supplies |  |  | 8,236 |  |  | 12,779 |  |  | 10,298 |
Direct labor |  |  | 2,373 |  |  | 1,989 |  |  | 2,287 |
Rentals |  |  | 1,527 |  |  | 1,603 |  |  | 859 |
Electricity and water |  |  | 1,328 |  |  | 21 |  |  | 7 |
Transport |  |  | 587 |  |  | 321 |  |  | 238 |
Maintenance and repair |  |  | 100 |  |  | 62 |  |  | 30 |
Insurance |  |  | - |  |  | 116 |  |  | 135 |
Other minor expenses |  |  | 940 |  |  | 262 |  |  | 3,232 |
|  |  | 94,928 |  |  | 96,149 |  |  | 89,699 |

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