Production and operating costs (Tables)

12 Months Ended

Dec. 31, 2017

Disclosure Of Production And Operating Costs [Abstract]

Disclosure Of Detailed Information On Production And Operating Costs [text block]

Amounts in US$ '000	2017		2016		2015
Well and facilities maintenance		14,722		13,160		19,974
Staff costs (Note 11)		15,017		10,859		17,999
Share-based payment (Notes 11)		457		622		563
Royalties		28,697		11,497		13,155
Consumables		11,902		8,283		8,591
Transportation costs		2,969		2,281		4,511
Equipment rental		5,818		3,868		3,517
Safety and Insurance costs		2,591		2,222		3,239
Gas plant costs		6,069		6,300		2,878
Field camp		2,377		1,687		2,645
Non operated blocks costs		1,213		1,082		2,127
Other costs		7,155		5,374		7,543
		98,987		67,235		86,742