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Mineral Property (Tables)

9 Months Ended

Sep. 30, 2018

Extractive Industries [Abstract]

Capitalized Investment in Mineral Property

(in thousands)	September 30,	December 31,
	2018	2017
Exploration
Lik project (Alaska – US)	$15,611	$15,611
La Promesa (Peru)	6	6
Montana Royalty property (US)	40	40
Total exploration mineral property	$15,657	$15,657

Exploration Expense

(in thousands)	Three months ended September 30,		Nine months ended September 30,
	2018	2017	2018	2017
Geologic and field expenses	$322	$74	$619	$195
Administrative	22	106	67	324
Total exploration costs	$344	$180	$686	$519