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Revenue

12 Months Ended

Dec. 31, 2018

Disclosure of disaggregation of revenue from contracts with customers [abstract]

28. Revenue

Revenue by metal for the year was as follows:



	December 31, 2018				December 31, 2017

Gold revenue	$	385,953			$	333,342
Zinc revenue	39,564				30,575
Lead revenue	21,625				18,272
Silver revenue	11,482				6,987
Iron revenue	—				2,347
Revenue from contracts with customers	$	458,624			$	391,523
Gain (loss) on revaluation of derivatives in trade receivables	392				(117		)
	$	459,016			$	391,406

For the year ended December 31, 2018, revenue from contracts with customers by product and segment was as follows:



	Turkey			Greece			Brazil			Total

Gold revenue - dore	$	220,382		$	—		$	—		$	220,382
Gold revenue - concentrate	123,960			41,611			—			165,571
Silver revenue - dore	1,245			—			—			1,245
Silver revenue - concentrate	2,941			7,296			—			10,237
Lead concentrate	—			21,625			—			21,625
Zinc concentrate	—			39,564			—			39,564
	$	348,528		$	110,096		$	—		$	458,624

28. Revenue (continued)

For the year ended December 31, 2017, revenue from contracts with customers by product and segment was as follows:



	Turkey			Greece			Brazil			Total

Gold revenue - dore	$	215,739		$	—		$	—		$	215,739
Gold revenue - concentrate	117,603			—			—			117,603
Silver revenue - dore	1,400			—			—			1,400
Silver revenue - concentrate	3,165			2,422			—			5,587
Lead concentrate	—			18,272			—			18,272
Zinc concentrate	—			30,575			—			30,575
Iron ore concentrate	—			—			2,347			2,347
	$	337,907		$	51,269		$	2,347		$	391,523