COMMITMENTS AND CONTINGENCIES (Tables)

12 Months Ended

Dec. 31, 2017

RENTAL EXPENSE, COMMITMENTS AND CONTINGENCIES

Schedule of minimum amounts under purchase commitments, long term leases covering office space, exploration expenditures, option payments on properties

	Payments due by period
	2018		2019		2020		2021		2022		Thereafter		Total
	(in thousands)
Operating lease obligations (office rent)	$	400	$	368	$	300	$	240	$	230	$	197	$	1,735
Operating lease obligations (mining and surface rights)		3,994		436		442		442		437		—		5,751
Exploration (including $10.0 million flow-through shares)		11,554		—		—		—		—		—		11,554
Construction		11,344		—		—		—		—		—		11,344
Reclamation costs(1)		639		448		3,883		3,974		3,181		30,807		42,932
Total	$	27,931	$	1,252	$	4,625	$	4,656	$	3,848	$	31,004	$	73,316

(1) Amounts presented represent the undiscounted uninflated future payments.