Geological and geophysical expenses (Tables)

12 Months Ended

Dec. 31, 2018

Disclosure Of Geological and geophysical expenses [Abstract]

Disclosure of detailed information about geological and geophysical expenses [text block]

Amounts in US$ '000	2018			2017			2016
Staff costs (Note 11)		15,005			10,525			9,541
Share-based payment (Note 11)		522			501			898
Allocation to capitalized project		(5,645	)		(6,402	)		(2,119	)
Other services		4,069			3,070			1,962
		13,951			7,694			10,282