
	Year Ended December 31, 2017
	Cost										Accumulated Depletion & Impairment ⁵														Carrying Amount Dec 31, 2017
(in thousands)	Balance Jan 1, 2017		Reductions²			Disposal¹			Balance Dec 31, 2017		Balance Jan 1, 2017			Depletion			Disposal¹		Impairment			Balance Dec 31, 2017			Carrying Amount Dec 31, 2017
Silver interests

San Dimas	$	190,331	$	-		$	-		$	190,331	$	(49,756	)	$	(5,713	)	$	-	$	-		$	(55,469	)	$	134,862

Peñasquito		524,626		-			-			524,626		(106,549	)		(14,827	)		-		-			(121,376	)		403,250

Antamina		900,343		-			-			900,343		(84,537	)		(58,168	)		-		-			(142,705	)		757,638

Constancia		302,948		-			-			302,948		(26,977	)		(14,168	)		-		-			(41,145	)		261,803

Other ^1, 2		1,329,731		(4,935	)		(41,959	)		1,282,837		(544,161	)		(28,820	)		41,959		(228,680	)		(759,702	)		523,135

	$	3,247,979	$	(4,935	)	$	(41,959	)	$	3,201,085	$	(811,980	)	$	(121,696	)	$	41,959	$	(228,680	)	$	(1,120,397	)	$	2,080,688

Gold interests

Sudbury ³		$623,864	$	-			-		$	623,864	$	(222,329	)	$	(21,547	)		-	$	-		$	(243,876	)	$	379,988

Salobo		3,059,876		-			-			3,059,876		(155,041	)		(96,103	)		-		-			(251,144	)		2,808,732

Constancia		136,058		-			-			136,058		(10,388	)		(3,619	)		-		-			(14,007	)		122,051

Other ⁴		402,232		-			-			402,232		(350,999	)		(19,415	)		-		-			(370,414	)		31,818

	$	4,222,030	$	-		$	-		$	4,222,030	$	(738,757	)	$	(140,684	)	$	-	$	-		$	(879,441	)	$	3,342,589

	$	7,470,009	$	(4,935	)	$	(41,959	)	$	7,423,115	$	(1,550,737	)	$	(262,380	)	$	41,959	$	(228,680	)	$	(1,999,838	)	$	5,423,277

Comprised of the Los Filos, Zinkgruvan, Yauliyacu, Stratoni, Keno Hill, Cozamin, Neves-Corvo, Minto, Aljustrel, Loma de La Plata, Pascua-Lama, Lagunas Norte, Pierina, Veladero, Rosemont and 777 silver interests. The Cozamin precious metal purchase agreement expired on April 4, 2017 and the fully depleted value of this contract has been reflected as a disposal.

On March 29, 2017, the Company amended its silver purchase agreement with Alexco Resource Corp. (“Alexco”) to adjust the silver production payment so that it will be a percentage of the spot silver price that increases with lower mill silver head grades and lower silver prices, and decreases with higher mill silver head grades and higher silver prices, subject to certain ceiling and floor grades and prices. In addition, the outside completion date was extended to December 31, 2019 and the area of interest was expanded to include properties currently owned by Alexco and properties acquired by Alexco in the future which fall within a one kilometer radius of existing Alexco holdings in the Keno Hill Silver District. As consideration, on April 10, 2017, Alexco issued 3 million shares to Wheaton which had a fair value of $5 million. The fair value of these shares have been reflected as a reduction to the cost base of the Keno Hill silver interest. On October 2, 2017, in connection with an option granted by Alexco to Banyan Gold Corp. (“Banyan”) over claims covered by the Alexco silver purchase agreement, the Company and Banyan entered into an accession agreement under which Banyan agreed to be bound by the terms of the silver purchase agreement in respect of those claims.

3)	Comprised of the Coleman, Copper Cliff, Garson, Stobie, Creighton, Totten and Victor gold interests.

4)	Comprised of the Minto, Rosemont and 777 gold interests.

5)	Includes cumulative impairment charges to December 31, 2017 as follows: Keno Hill silver interest - $11 million; Pascua-Lama silver interest - $338 million; 777 silver interest - $64 million; 777 gold interest - $151 million; and Sudbury gold interest - $120 million.


	Year Ended December 31, 2016
	Cost						Accumulated Depletion & Impairment ⁴
(in thousands)	Balance Jan 1, 2016		Additions		Balance Dec 31, 2016		Balance Jan 1, 2016			Depletion			Impairment			Balance Dec 31, 2016			Carrying Amount Dec 31, 2016

Silver interests

San Dimas	$	190,331	$	-	$	190,331	$	(43,776	)	$	(5,980	)	$	-		$	(49,756	)	$	140,575

Peñasquito		524,626		-		524,626		(93,779	)		(12,770	)		-			(106,549	)		418,077

Antamina		900,289		54		900,343		(13,308	)		(71,229	)		-			(84,537	)		815,806

Constancia		302,948		-		302,948		(9,017	)		(17,960	)		-			(26,977	)		275,971

Other ¹		1,329,731		-		1,329,731		(501,379	)		(42,782	)		-			(544,161	)		785,570

	$	3,247,925	$	54	$	3,247,979	$	(661,259	)	$	(150,721	)	$	-		$	(811,980	)	$	2,435,999

Gold interests

Sudbury ²	$	623,864	$	-	$	623,864	$	(117,614	)	$	(33,715	)	$	(71,000	)	$	(222,329	)	$	401,535

Salobo		2,230,368		829,508		3,059,876		(73,611	)		(81,430	)		-			(155,041	)		2,904,835

Constancia		136,058		-		136,058		(4,133	)		(6,255	)		-			(10,388	)		125,670

Other ³		402,232		-		402,232		(314,418	)		(36,581	)		-			(350,999	)		51,233

	$	3,392,522	$	829,508	$	4,222,030	$	(509,776	)	$	(157,981	)	$	(71,000	)	$	(738,757	)	$	3,483,273

	$	6,640,447	$	829,562	$	7,470,009	$	(1,171,035	)	$	(308,702	)	$	(71,000	)	$	(1,550,737	)	$	5,919,272

1)	Comprised of the Los Filos, Zinkgruvan, Yauliyacu, Stratoni, Keno Hill, Cozamin, Neves-Corvo, Minto, Aljustrel, Loma de La Plata, Pascua-Lama, Lagunas Norte, Pierina, Veladero, Rosemont and 777 silver interests.

2)	Comprised of the Coleman, Copper Cliff, Garson, Stobie, Creighton, Totten and Victor gold interests.

3)	Comprised of the Minto, Rosemont and 777 gold interests.

4)	Includes cumulative impairment charges to December 31, 2016 as follows: Keno Hill silver interest - $11 million; Pascua-Lama silver interest - $110 million; 777 silver interest - $64 million; 777 gold interest - $151 million; and Sudbury gold interest - $120 million.