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Sales of goods (Details) £ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2017 USD ($) | Dec. 31, 2017 GBP (£) | Dec. 31, 2016 USD ($) | Dec. 31, 2016 GBP (£) | Dec. 31, 2015 USD ($) | Dec. 31, 2015 GBP (£)
Disclosure of Sales of goods [Line Items] |  |  |  |  |  |
Revenue from sale of copper | $ 268,527 |  | $ 224,649 |  | $ 131,356 |
Revenue from sale of silver | 409,775 |  | 385,989 |  | 313,418 |
Revenue from sale of goods before deducting royalty expense | 3,211,266 |  | 2,390,840 |  | 1,119,370 |
Royalty expense | 31,217 |  | 27,611 |  | (27,188) |
Revenue from sale of goods | 1,223,942 |  | 1,015,670 |  | 846,269 |
Copper concentrate [Member] |  |  |  |  |  |
Disclosure of Sales of goods [Line Items] |  |  |  |  |  |
Revenue from sale of copper | 2,702,508 | £ 979,243 | 1,967,052 | £ 995,386 | 794,197 | £ 440,071
Copper cathode [Member] |  |  |  |  |  |
Disclosure of Sales of goods [Line Items] |  |  |  |  |  |
Revenue from sale of copper | $ 241,725 | £ 84,679 | $ 247,431 | £ 109,128 | $ 259,830 | £ 104,279

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