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Exploration in non-operating areas (Tables)

12 Months Ended

Dec. 31, 2017

Disclosure Of Exploration In Non-Operating Areas [Abstract]

Disclosure of detailed information about exploration in non-operating units [Text Block]

This caption is made up as follows:

		2017			2016			2015
		US$(000)			US$(000)			US$(000)

Services provided by third parties			5,401			13,629			18,852
Personnel expenses			4,064			3,908			4,713
Lands			1,781			1,691			-
Rentals			1,171			578			376
Consumption of materials and supplies			582			768			1,436
Transport			144			26			20
Maintenance and repairs			134			72			87
Insurance			27			49			84
Rights			-			3,457			-
Other expenses			4,958			2,411			5,042
			18,262			26,589			30,610