Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2018

Commitments and Contingencies

Schedule of non-cancellable operating lease commitments

	2019		2020		2021		2022		2023		Thereafter
El Quevar mining concessions (estimated)	$	60	$	60	$	60	$	60	$	60	$	—
Velardeña mining concessions (estimated)	$	80	$	80	$	80	$	80	$	80	$	—
Office space	$	224	$	157	$	160	$	163	$	166	$	154