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Net sales | 12 Months Ended
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Dec. 31, 2018
Sale of goods [Line Items] |
Disclosure of revenue [text block] |
| 20. | Net sales
| (a) | The Group’s revenues are mostly from sales of gold and precious metals in the form of concentrates, including silver-lead, silver-gold, zinc and lead-gold-copper concentrates and ounces of gold. Set out below is the disaggregation of the Group’s revenue from contracts with customers:
|  | 2018 |  |  | 2017 |  |  | 2016 |
|  | US$(000) |  |  | US$(000) |  |  | US$(000) |
Revenues by geographic region: |  |  |  |  |  |  |  |  |  |  |  |
Metal and concentrates sales - |  |  |  |  |  |  |  |  |  |  |  |
Peru |  |  | 537,816 |  |  |  | 551,243 |  |  |  | 396,733 |
America |  |  | 370,624 |  |  |  | 471,863 |  |  |  | 397,795 |
Asia |  |  | 120,519 |  |  |  | 120,719 |  |  |  | 97,467 |
Europe |  |  | 100,792 |  |  |  | 81,333 |  |  |  | 121,929 |
|  |  | 1,129,751 |  |  |  | 1,225,158 |  |  |  | 1,013,924 |
Services - |  |  |  |  |  |  |  |  |  |  |  |
Peru |  |  | 23,712 |  |  |  | 14,903 |  |  |  | 28,782 |
America |  |  | 289 |  |  |  | 14,794 |  |  |  | - |
|  |  | 24,001 |  |  |  | 29,697 |  |  |  | 28,782 |
Royalties - |  |  |  |  |  |  |  |  |  |  |  |
Peru |  |  | 20,385 |  |  |  | 20,739 |  |  |  | 24,339 |
|  |  | 1,174,137 |  |  |  | 1,275,594 |  |  |  | 1,067,045 |
|  | 2018 |  |  | 2017 |  |  | 2016 |
|  | US$(000) |  |  | US$(000) |  |  | US$(000) |
Revenues by type of good or services: |  |  |  |  |  |  |  |  |  |  |  |
Sales by metal - |  |  |  |  |  |  |  |  |  |  |  |
Gold |  |  | 411,926 |  |  |  | 511,434 |  |  |  | 440,603 |
Silver |  |  | 369,167 |  |  |  | 409,775 |  |  |  | 385,989 |
Copper |  |  | 274,761 |  |  |  | 268,527 |  |  |  | 224,649 |
Zinc |  |  | 174,048 |  |  |  | 188,023 |  |  |  | 142,425 |
Lead |  |  | 89,059 |  |  |  | 94,955 |  |  |  | 58,690 |
Manganese sulfate |  |  | 6,655 |  |  |  | 6,317 |  |  |  | 5,982 |
Indium |  |  | - |  |  |  | 66 |  |  |  | - |
|  |  | 1,325,616 |  |  |  | 1,479,097 |  |  |  | 1,258,338 |
Commercial deductions |  |  | (195,865 | ) |  |  | (253,939 | ) |  |  | (244,414 | )
|  |  | 1,129,751 |  |  |  | 1,225,158 |  |  |  | 1,013,924 |
Sales by services - |  |  | 24,001 |  |  |  | 29,697 |  |  |  | 28,782 |
Royalties income - |  |  | 20,385 |  |  |  | 20,739 |  |  |  | 24,339 |
Total revenue from contracts with customers |  |  | 1,174,137 |  |  |  | 1,275,594 |  |  |  | 1,067,045 |
Revenues by timing of revenue recognition: |  |  |  |  |  |  |  |  |  |  |  |
Goods transferred at a point in time |  |  | 1,129,751 |  |  |  | 1,225,158 |  |  |  | 1,013,924 |
Services transferred over time |  |  | 24,001 |  |  |  | 29,697 |  |  |  | 28,782 |
Royalties at a point of time |  |  | 20,385 |  |  |  | 20,739 |  |  |  | 24,339 |
|  |  | 1,174,137 |  |  |  | 1,275,594 |  |  |  | 1,067,045 |
| (b) | Set out below, is the reconciliation of the revenue from contracts with customers with the amounts disclosed in the consolidated statement of profit or loss:
|  | 2018 |  |  | 2017 |  |  | 2016 |
|  | US$(000) |  |  | US$(000) |  |  | US$(000) |
Contracts with customers for sale of goods |  |  | 1,129,751 |  |  |  | 1,225,158 |  |  |  | 1,013,924 |
Adjustments to prior period liquidations |  |  | 857 |  |  |  | 919 |  |  |  | 4,611 |
Fair value of accounts receivables |  |  | (6,215 | ) |  |  | 8,786 |  |  |  | 880 |
Hedge operations |  |  | (1,398 | ) |  |  | (10,921 | ) |  |  | (3,745 | )
Net sale of goods |  |  | 1,122,995 |  |  |  | 1,223,942 |  |  |  | 1,015,670 |
Contracts with customers for sale of services |  |  | 24,001 |  |  |  | 29,697 |  |  |  | 28,782 |
Net sale of services |  |  | 24,001 |  |  |  | 29,697 |  |  |  | 28,782 |
Contracts with customers for royalty income |  |  | 20,385 |  |  |  | 20,739 |  |  |  | 24,339 |
Royalty income |  |  | 20,385 |  |  |  | 20,739 |  |  |  | 24,339 |
|  |  | 1,167,381 |  |  |  | 1,274,378 |  |  |  | 1,068,791 |
| (c) | Performance obligations -
The performance obligation of the sale of goods is satisfied upon delivery of the goods and payment is generally due within 30 to 90 days from delivery. Performance obligation of services is satisfied over-time and payment is generally due upon completion and acceptance of service.
| (d) | Concentration of sales -
In 2018, the three customers with sales of more than 10 percent of total net sales represented 32, 13 and 11 percent from the total net sales of the Group (three customers by 28, 15 and 10 percent during 2017; three customers by 28, 22 and 22 percent during 2016). As of December 31, 2018, 43 percent of the accounts receivable correspond to these customers (49 percent as of December 31, 2017). These customers are related to the mining business. The Group's sales of gold and concentrates are delivered to investment banks and national and international well-known companies. Some of these clients have long-term sales contracts that guarantee supplying them the production from the Group’s mines.
Sociedad Minera Cerro Verde S.A.A. [Member] |
Sale of goods [Line Items] |
Disclosure of revenue [text block] |
| 14. | Sales of goods
| (a) | This item is made up as follows:
|  | For the year ended December 31, 2018 |  |  | For the year ended December 31, 2017 |  | For the year ended December 31, 2016 |
|  | Pounds (000) |  |  | US$(000) |  |  | Pounds (000) |  |  | US$(000) |  |  | Pounds (000) |  |  | US$(000) |
Copper in concentrate |  |  | 962,113 |  |  |  | 2,458,088 |  |  |  | 979,243 |  |  |  | 2,702,508 |  |  |  | 995,386 |  |  |  | 1,967,052 |
Copper cathode |  |  | 86,346 |  |  |  | 251,908 |  |  |  | 84,679 |  |  |  | 241,725 |  |  |  | 109,128 |  |  |  | 247,431 |
Other (primarily silver and molybdenum concentrate) |  |  |  |  |  |  | 351,934 |  |  |  |  |  |  |  | 267,033 |  |  |  |  |  |  |  | 176,357 |
Subtotal Sales |  |  |  |  |  |  | 3,061,930 |  |  |  |  |  |  |  | 3,211,266 |  |  |  |  |  |  |  | 2,390,840 |
Less: Royalty contributions (see Note 2(k)) |  |  |  |  |  |  | (7,904 | ) |  |  |  |  |  |  | (8,335 | ) |  |  |  |  |  |  | (6,686 | )
Total net sales |  |  |  |  |  |  | 3,054,026 |  |  |  |  |  |  |  | 3,202,931 |  |  |  |  |  |  |  | 2,384,154 |
Sales to related parties totaled US$2.9 billion for the year ended December 31, 2018 (US$3.0 billion for the year ended December 31, 2017 and US$2.3 billion for the year ended December 31, 2016). As described in Note 2(d), the Company’s copper sales are provisionally priced at shipment. Adjustments to the provisional prices are recognized as gains and losses in sales of goods through the month of settlement. Adjustments to provisional priced copper and molybdenum sales resulted in an decrease to net sales of goods totaling US$88.8 million for the year ended December 31, 2018, an increase of US$1.3 million for the year ended December 31, 2017 and US$86.3 billion for the year ended December 31, 2016.
| (b) | The following table shows net sales by geographic region based on the final destination port:
|  | For the year ended December 31, 2018 |  |  | For the year ended December 31, 2017 |  |  | For the year ended December 31, 2016 |
|  | US$(000) |  |  | US$(000) |  |  | US$(000) |
Asia |  |  | 2,404,530 |  |  |  | 2,416,826 |  |  |  | 1,865,346 |
North America |  |  | 295,448 |  |  |  | 287,174 |  |  |  | 213,002 |
Europe |  |  | 209,894 |  |  |  | 314,092 |  |  |  | 161,844 |
South America (primarily Peru) |  |  | 136,400 |  |  |  | 193,174 |  |  |  | 150,648 |
Central America |  |  | 15,658 |  |  |  | - |  |  |  | - |
|  |  | 3,061,930 |  |  |  | 3,211,266 |  |  |  | 2,390,840 |
Less: Royalty contributions (see Note 2(k)) |  |  | (7,904 | ) |  |  | (8,335 | ) |  |  | (6,686 | )
Total net sales |  |  | 3,054,026 |  |  |  | 3,202,931 |  |  |  | 2,384,154 |
| (c) | Concentration of sales -
For the years ended December 31, 2018 and 2017 94% of the Company’s sales were to related entities (FMC, Sumitomo Metal Mining Company and Climax Molybdenum). For the year ended December 31, 2016 the 95% of the Company's sales were to these related entities, respectively.
Minera Yanacocha SRL and subsidiary [Member] |
Sale of goods [Line Items] |
Disclosure of revenue [text block] |
| 16. | Revenue from sales
| (a) | The Company’s revenues are mainly from sales of gold ounces. The table below presents the net sales to customers by geographic region:
|  | 2018 |  |  | 2017 |  |  | 2016 |
|  | US$(000) |  |  | US$(000) |  |  | US$(000) |
Sales and services by geographic region: |  |  |  |  |  |  |  |  |  |  |  |
Metal sales |  |  |  |  |  |  |  |  |  |  |  |
Switzerland |  |  | 518,664 |  |  |  | 491,887 |  |  |  | 558,723 |
America |  |  | 139,989 |  |  |  | 179,018 |  |  |  | 233,043 |
|  |  | 658,653 |  |  |  | 670,905 |  |  |  | 791,766 |
Royalties, note 1(a) and 22 |  |  | (20,385 | ) |  |  | (20,739 | ) |  |  | (24,339 | )
Mining royalties to the government |  |  | (2,875 | ) |  |  | (4,990 | ) |  |  | (6,234 | )
|  |  | 635,393 |  |  |  | 645,176 |  |  |  | 761,193 |
| (b) | Other operating income is made up as follows:
|  | 2018 |  |  | 2017 |  |  | 2016 |
|  | US$(000) |  |  | US$(000) |  |  | US$(000) |
Sales of copper and silver |  |  | 20,442 |  |  |  | 17,509 |  |  |  | 8,136 |
Others |  |  | 1,523 |  |  |  | 4,361 |  |  |  | 9,577 |
|  |  | 21,965 |  |  |  | 21,870 |  |  |  | 17,713 |
The amount of the subsequent changes in fair value of the trade receivable were a decrease of US$176,000, US$15,000 and US$346,000 in 2018, 2017 and 2016, respectively and are presented as part of the caption “Sales of copper and silver”.

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