Exploration and Evaluation Assets (Tables)

12 Months Ended

Apr. 30, 2018

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Summary of Exploration and Evaluation assets

	AJC Properties			Creston Properties		Santa Fe Property			Total
Acquisition costs:
Balance, April 30, 2016	$	1,083		$	2,001	$	—		$	3,084
Effect of foreign exchange		131			—		—			131
Balance, April 30, 2017		1,214			2,001		—			3,215
Property disposition		(970	)		—		—			(970	)
Recovery on disposal of E&E Asset		(128	)		—		—			(128	)
Effect of foreign exchange		(80	)		—		—			(80	)
Balance, April 30, 2018		36			2,001		—			2,037
Exploration costs:
Balance, April 30, 2016		121			659		—			780
Assays		82			—		—			82
Exploration cost		96			—		—			96
Drilling		1,288			—		—			1,288
Geological		178			139		—			317
Legal fees		—			41		—			41
Maintenance		56			189		—			245
Effect of foreign exchange		(109	)		—		—			(109	)
Balance, April 30, 2017		1,712			1,028		—			2,740
Exploration cost		23			—		—			23
Drilling		18			—		—			18
Geological		31			13		45			89
Legal fees		—			15		—			15
Maintenance		62			274		—			336
Property disposition		(37	)		—		(45	)		(82	)
Effect of foreign exchange		—			1		—			1
Balance, April 30, 2018	$	1,809		$	1,331	$	—		$	3,140
Total Exploration and Evaluation Assets
Balance, April 30, 2017	$	2,926		$	3,029	$	—		$	5,955
Balance, April 30, 2018	$	1,845		$	3,332	$	—		$	5,177