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Exploration in non-operating areas (Tables) | 12 Months Ended
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Dec. 31, 2020
Exploration in non-operating areas |
Schedule of detailed information about exploration in non-operating areas | This caption is made up as follows:
|  | 2020 |  | 2019 |  | 2018
|  | US$(000) |  | US$(000) |  | US$(000)
Services provided by third parties |  | 3,326 |  | 3,611 |  | 22,764
Personnel expenses |  | 1,705 |  | 3,632 |  | 4,830
Services provided by third parties |  | 1,538 |  | 766 |  | 1,211
Lands |  | 420 |  | 1,528 |  | 1,867
Short-term and low-value lease |  | 327 |  | 415 |  | 1,524
Consumption of materials and supplies |  | 201 |  | 328 |  | 1,420
Other minor |  | 958 |  | 1,599 |  | 2,691
|  | 8,475 |  | 11,879 |  | 36,307

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