Production and operating costs (Tables)

12 Months Ended

Dec. 31, 2018

Disclosure Of Production And Operating Costs [Abstract]

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

Amounts in US$ '000	2018		2017		2016
Well and facilities maintenance		20,262		14,722		13,160
Operation and maintenance		7,756		3,116		2,137
Staff costs (Note 11)		17,725		11,901		8,722
Share-based payment (Note 11)		878		457		622
Royalties		71,836		28,697		11,497
Consumables		17,444		11,902		8,283
Transportation costs		2,628		2,969		2,281
Equipment rental		9,317		5,818		3,868
Safety and Insurance costs		3,878		2,591		2,222
Gas plant costs		5,967		6,069		6,300
Field camp		2,959		2,377		1,687
Non-operated blocks costs		1,327		1,213		1,082
Other costs		12,283		7,155		5,374
		174,260		98,987		67,235