Note 7 – Royalty, stream and working interests

Royalty, stream and working interests, net of accumulated depletion and impairment charges, comprise the following:


	As at June 30, 2019
			Accumulated
	Cost		Depletion(1)		Impairment		Carrying Value
Mining royalties	$	1,027.2	$	(594.3)	$	—	$	432.9
Streams		4,270.9		(1,377.3)		—		2,893.6
Energy		1,408.3		(358.0)		—		1,050.3
Advanced		207.4		(30.4)		—		177.0
Exploration		54.6		(12.6)		—		42.0
	$	6,968.4	$	(2,372.6)	$	—	$	4,595.8

Accumulated depletion includes previously recognized impairment charges.


	As at December 31, 2018
			Accumulated
	Cost		Depletion(1)		Impairment		Carrying Value
Mining royalties	$	1,021.4	$	(571.3)	$	—	$	450.1
Streams		4,346.3		(1,303.3)		(75.4)		2,967.6
Energy		1,303.8		(337.2)		—		966.6
Advanced		159.9		(30.1)		—		129.8
Exploration		54.7		(12.6)		(0.6)		41.5
	$	6,886.1	$	(2,254.5)	$	(76.0)	$	4,555.6

Accumulated depletion includes previously recognized impairment charges.

The movement in royalty, stream and working interests for the six months ended June 30, 2019 is as follows:


	Mining
	Royalties		Streams		Energy		Advanced		Exploration		Total
Balance at December 31, 2018	$	450.1	$	2,967.6	$	966.6	$	129.8	$	41.5	$	4,555.6
Acquisitions (Note 3)		—		—		87.6		45.8		—		133.4
Depletion		(23.0)		(74.0)		(20.8)		(0.3)		—		(118.1)
Impact of foreign exchange		5.8		—		16.9		1.7		0.5		24.9
Balance at June 30, 2019	$	432.9	$	2,893.6	$	1,050.3	$	177.0	$	42.0	$	4,595.8

Of the total net book value as at June 30, 2019, $2,352.8 million (December 31, 2018 - $2,233.0 million) is depletable and $2,243.0 million (December 31, 2018 - $2,322.6 million) is non-depletable.