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Cost of sales, without considering depreciation and amortization (Tables)

12 Months Ended

Dec. 31, 2017

Disclosure of Cost Of Sales [Abstract]

Disclosure of detailed information of cost of sale of goods and services [Text Block]

(a)

The cost of sales of goods is made up as follows:

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

Beginning balance of finished goods and products in process, net of depreciation and amortization			58,633			69,932			105,944
Cost of production
Services provided by third parties			262,195			211,325			230,148
Consumption of materials and supplies			134,070			100,401			100,241
Direct labor			87,886			72,344			66,745
Electricity and water			44,345			41,989			34,972
Rentals			26,591			10,852			5,783
Maintenance and repair			22,839			17,792			7,401
Transport			16,254			10,880			9,502
Insurances			6,637			4,347			5,247
Provision (reversal) for impairment of finished goods and product in progress, note 8(b)			2,118			(7,581)			13,096
Cost of concentrate purchased to associates			439			2,958			-
Other production expenses			10,464			9,789			7,078
Total cost of production of the period			613,838			475,096			480,213
Final balance of products in process and finished goods, net of depreciation and amortization			(45,038)			(47,216)			(72,667)
Cost of sales of goods, without considering depreciation and amortization			627,433			497,812			513,490

(a)

The cost of services is made up as follows:

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

Direct labor			7,398			5,983			18,314
Services provided by third parties			1,782			1,689			16,247
Consumption of materials and supplies			1,026			868			7,865
Maintenance and repair			946			217			637
Electricity and water			586			633			7,134
Rentals			423			480			2,544
Insurances			246			212			1,233
Transport			98			213			3,868
Other			449			459			1,770
Cost of sales of services, without considering depreciation and amortization			12,954			10,754			59,612