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Basis for preparation, consolidation and accounting policies (Tables) | 12 Months Ended
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Dec. 31, 2018
Disclosure of basis for preparation, consolidation and accounting policies [Line Items] |
Disclosure of Measurement Requirement of IFRS9 Explanatory [Table Text Block] | The classification and measurement requirements of IFRS 9 did not have a significant impact to the Group. Upon the adoption of IFRS 9, the Group had the following required or elected reclassifications as of January 1, 2018.
|  |  |  |  | IFRS 9 measurement category |
|  |  |  |  | Fair value through profit or loss |  |  | Amortized cost |  |  | Fair value through other profit or loss |
|  | US$(000) |  |  | US$(000) |  |  | US$(000) |  |  | US$(000) |
IAS 39 measurement category |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial Assets - |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans and receivables - |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trade receivables (without provisional prices) |  |  | 61,188 |  |  |  | - |  |  |  | 61,188 |  |  |  | - |
Trade receivables (with provisional prices) |  |  | 144,844 |  |  |  | 152,268 |  |  |  | - |  |  |  | - |
Other accounts receivables |  |  | 51,808 |  |  |  | - |  |  |  | 51,808 |  |  |  | - |
Financial assets at fair value through profit and loss - |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Embedded derivatives |  |  | 7,424 |  |  |  | - |  |  |  | - |  |  |  | - |
Financial Liabilities - |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans and borrowings - |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bank loans |  |  | 96,215 |  |  |  | - |  |  |  | 96,215 |  |  |  | - |
Financial obligations |  |  | 633,083 |  |  |  | - |  |  |  | 633,083 |  |  |  | - |
Trade and other payables |  |  | 220,042 |  |  |  | - |  |  |  | 220,042 |  |  |  | - |
Financial liability at fair value through profit and loss - |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration liability |  |  | 17,570 |  |  |  | 17,570 |  |  |  | - |  |  |  | - |
Fair value with changes in profit (loss) - |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Hedge derivative financial instruments |  |  | 28,705 |  |  |  | - |  |  |  | - |  |  |  | 28,705 |
The disclosure of useful lives of assets. [Text Block] | Depreciation of assets in mining units with short useful lives or used for administrative purposes is calculated using the straight-line method of accounting. The useful lives are the following:
| Years
Buildings, construction and other | Between 6 and 20
Machinery and equipment | Between 5 and 10
Transportation units | 5
Furniture and fixtures | 10
Computer equipment | 4
Minera Yanacocha SRL and subsidiary [Member] |
Disclosure of basis for preparation, consolidation and accounting policies [Line Items] |
Disclosure of Measurement Requirement of IFRS9 Explanatory [Table Text Block] | The classification and measurement requirements of IFRS 9 did not have a significant impact to the Company. Upon the adoption of IFRS 9, the Company had the following required or elected balances as of January 1, 2018. January 1, 2018 -
|  |  |  |  | IFRS 9 measurement category |
|  |  |  |  | Fair value through profit or loss/OCI |  |  | Amortized cost |
|  | US$(000) |  |  | US$(000) |  |  | US$(000) |
IAS 39 measurement category |  |  |  |  |  |  |  |  |  |  |  |
Financial Assets - |  |  |  |  |  |  |  |  |  |  |  |
Financial assets - |  |  |  |  |  |  |  |  |  |  |  |
Embedded derivatives |  |  | 15 |  |  |  | 15 |  |  |  | - |
Financial assets at fair value |  |  | 23,000 |  |  |  | 23,000 |  |  |  | - |
Receivables - |  |  |  |  |  |  |  |  |  |  |  |
Trade receivables |  |  | 1,032 |  |  |  | - |  |  |  | 1,032 |
Other receivables |  |  | 25,557 |  |  |  | - |  |  |  | 25,557 |
Financial Liabilities - |  |  |  |  |  |  |  |  |  |  |  |
Loans and borrowings - |  |  |  |  |  |  |  |  |  |  |  |
Trade and other payables |  |  | 81,215 |  |  |  | - |  |  |  | 81,215 |
January 1, 2017 -
|  |  |  |  | IFRS 9 measurement category |
|  |  |  |  | Fair value through profit or loss/OCI |  |  | Amortized cost |
|  | US$(000) |  |  | US$(000) |  |  | US$(000) |
IAS 39 measurement category |  |  |  |  |  |  |  |  |  |  |  |
Financial Assets - |  |  |  |  |  |  |  |  |  |  |  |
Financial assets - |  |  |  |  |  |  |  |  |  |  |  |
Embedded derivatives |  |  | 346 |  |  |  | 346 |  |  |  | - |
Financial assets at fair value |  |  | 16,454 |  |  |  | 16,454 |  |  |  | - |
Receivables - |  |  |  |  |  |  |  |  |  |  |  |
Trade receivables |  |  | 9,965 |  |  |  | - |  |  |  | 9,965 |
Other receivables |  |  | 24,055 |  |  |  | - |  |  |  | 24,055 |
Financial Liabilities - |  |  |  |  |  |  |  |  |  |  |  |
Loans and borrowings - |  |  |  |  |  |  |  |  |  |  |  |
Trade and other payables |  |  | 63,300 |  |  |  | - |  |  |  | 63,300 |
The disclosure of useful lives of assets. [Text Block] | Remaining useful lives as follows:
Land improvements | Between 2 and 4 years
Buildings | Between 5 and 10 years
Plant and equipment | Between 3 and 10 years
Vehicles | Between 3 and 4 years
Furniture and fittings | Between 3 and 4 years
Other equipment | Between 3 and 4 years
Computer equipment | Between 3 and 4 years
Assets retirement cost | Useful life of the mine and (or) process facilities

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