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Revenue from sales (Tables)
 12 Months Ended
Dec. 31, 2018
Disclosure Of Detailed Information About Net Sales To Customers By Geographical Areas [Text Block]
 
(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
 
Minera Yanacocha SRL and subsidiary [member]  
Disclosure of Detailed Information About Other Operating Income [Table Text Block]
 
(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