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Cost of sales, without considering depreciation and amortization (Tables) | 12 Months Ended
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Dec. 31, 2017
Disclosure of Cost Of Sales [Abstract] |
Disclosure of detailed information of cost of sale of goods and services [Text Block] |
| (a) | The cost of sales of goods is made up as follows:
|  | 2017 |  | 2016 |  | 2015 |
|  | US$(000) |  | US$(000) |  | US$(000) |
Beginning balance of finished goods and products in process, net of depreciation and amortization |  |  | 58,633 |  |  | 69,932 |  |  | 105,944 |
Cost of production |  |  |  |  |  |  |  |  |  |
Services provided by third parties |  |  | 262,195 |  |  | 211,325 |  |  | 230,148 |
Consumption of materials and supplies |  |  | 134,070 |  |  | 100,401 |  |  | 100,241 |
Direct labor |  |  | 87,886 |  |  | 72,344 |  |  | 66,745 |
Electricity and water |  |  | 44,345 |  |  | 41,989 |  |  | 34,972 |
Rentals |  |  | 26,591 |  |  | 10,852 |  |  | 5,783 |
Maintenance and repair |  |  | 22,839 |  |  | 17,792 |  |  | 7,401 |
Transport |  |  | 16,254 |  |  | 10,880 |  |  | 9,502 |
Insurances |  |  | 6,637 |  |  | 4,347 |  |  | 5,247 |
Provision (reversal) for impairment of finished goods and product in progress, note 8(b) |  |  | 2,118 |  |  | (7,581) |  |  | 13,096 |
Cost of concentrate purchased to associates |  |  | 439 |  |  | 2,958 |  |  | - |
Other production expenses |  |  | 10,464 |  |  | 9,789 |  |  | 7,078 |
Total cost of production of the period |  |  | 613,838 |  |  | 475,096 |  |  | 480,213 |
Final balance of products in process and finished goods, net of depreciation and amortization |  |  | (45,038) |  |  | (47,216) |  |  | (72,667) |
Cost of sales of goods, without considering depreciation and amortization |  |  | 627,433 |  |  | 497,812 |  |  | 513,490 |
| (a) | The cost of services is made up as follows:
|  | 2017 |  | 2016 |  | 2015 |
|  | US$(000) |  | US$(000) |  | US$(000) |
Direct labor |  |  | 7,398 |  |  | 5,983 |  |  | 18,314 |
Services provided by third parties |  |  | 1,782 |  |  | 1,689 |  |  | 16,247 |
Consumption of materials and supplies |  |  | 1,026 |  |  | 868 |  |  | 7,865 |
Maintenance and repair |  |  | 946 |  |  | 217 |  |  | 637 |
Electricity and water |  |  | 586 |  |  | 633 |  |  | 7,134 |
Rentals |  |  | 423 |  |  | 480 |  |  | 2,544 |
Insurances |  |  | 246 |  |  | 212 |  |  | 1,233 |
Transport |  |  | 98 |  |  | 213 |  |  | 3,868 |
Other |  |  | 449 |  |  | 459 |  |  | 1,770 |
Cost of sales of services, without considering depreciation and amortization |  |  | 12,954 |  |  | 10,754 |  |  | 59,612 |

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- Definition The disclosure of detailed information of Cost of sale of goods and services. + References No definition available. + Details
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