Prepaids and deposits (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Prepaids:
Insurance	$ 625	$ 1,215
License fees	554	405
Mining claims fees and permit fees	442	569
Property tax	312	0
Services	180	22
Surety bond fees	144	560
Deposits	183	182
Total	2,440	2,953
Prepaids, non-current:
Insurance	29	37
Total	$ 29	$ 37