Prepaids and deposits (Details) - USD ($) $ in Thousands	Sep. 30, 2026	Dec. 31, 2025
Prepaids:
Surety bond fees	$ 806	$ 560
Insurance	461	1,215
License fees	466	405
Mining claims fees and permit fees	690	569
Services	785	22
Deposits	183	182
Total	3,391	2,953
Prepaids, non-current:
Insurance	14	37
Total	$ 14	$ 37