Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Segment Information
Exploration	$ 479	$ 134	$ 1,397	$ 516
General and administrative	5,994	1,965	14,008	4,345
Amortization	31	7	45	24
Equity income (loss) in affiliates	1,600	3,447	22,592	(18,069)
Term Loan closing fee	10,000		10,000
Net other loss (income)	95	908	270	3,253
Total Assets	408,385	112,933	408,385	112,933	$ 265,410
Mexico.
Segment Information
Exploration	479	134	1,397	516
General and administrative	577	195	909	447
Equity income (loss) in affiliates	1,600	3,447	22,592	(18,069)
Net other loss (income)	15	(2)	34	22
Total Assets	61,373	37,359	61,373	37,359
Corporate
Segment Information
General and administrative	5,417	1,770	13,099	3,898
Amortization	31	7	45	24
Term Loan closing fee	10,000		10,000
Net other loss (income)	80	910	236	3,231
Total Assets	$ 347,012	$ 75,574	$ 347,012	$ 75,574