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Net sales (Tables)

12 Months Ended

Dec. 31, 2017

Disclosure Of Net sales [Abstract]

Disclosure of detailed information about net sales and services rendered [Text Block]

The table below presents the net sales to customers by geographic region and product type:

		2017			2016			2015
		US$(000)			US$(000)			US$(000)
Sales and services by geographic region:
Metal and concentrates sales
Peru			591,185			401,372			345,146
America			464,000			410,154			419,359
Europe			91,414			109,788			60,549
Asia			77,343			94,356			21,215
			1,223,942			1,015,670			846,269
Services rendered
Peru			14,903			28,782			50,839
America			14,794			-			-
			29,697			28,782			50,839
			1,253,639			1,044,452			897,108
Sale by metal:
Gold			511,434			440,603			419,541
Silver			409,775			385,989			313,418
Copper			268,527			224,649			131,356
Zinc			188,023			142,425			102,110
Lead			94,955			58,690			55,445
Manganese sulfate			6,317			5,982			3,649
Indium			66			-			-
			1,479,097			1,258,338			1,025,519
Commercial deductions			(253,939)			(244,414)			(196,145)
Adjustments to prior period liquidations			919			4,611			7,467
Embedded derivatives from sale of concentrate			8,786			880			(388)
Hedge operations			(10,921)			(3,745)			9,816
			1,223,942			1,015,670			846,269
Services rendered			29,697			28,782			50,839
			1,253,639			1,044,452			897,108

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The disclosure of detailed information about net sales and services rendered.

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