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Mining royalties
12 Months Ended
Dec. 31, 2017
Disclosure Of Mining Royalties [Abstract]  
Disclosure Of Mining Royalties [Text Block]
23.
Mining royalties
 
This caption is made up as follows:
 
 
 
2017
 
2016
 
2015
 
 
 
US$(000)
 
US$(000)
 
US$(000)
 
 
 
 
 
 
 
 
 
 
 
 
Sindicato Minero de Orcopampa S.A., note 28(b)
 
 
20,165
 
 
19,824
 
 
21,942
 
Royalties paid to the Peruvian State
 
 
11,052
 
 
7,787
 
 
5,246
 
 
 
 
31,217
 
 
27,611
 
 
27,188