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Commitments and Contingencies (Details) $ in Thousands									3 Months Ended	12 Months Ended		84 Months Ended
Commitments and Contingencies (Details) $ in Thousands	Dec. 19, 2025 USD ($) shares	Dec. 02, 2025 USD ($)	Oct. 17, 2025 USD ($)	Oct. 15, 2025 USD ($)	Aug. 29, 2025 USD ($) person	Jun. 06, 2025 plaintiff	Feb. 13, 2025 USD ($)	Aug. 08, 2023 USD ($)	Jun. 30, 2023 USD ($)	Dec. 31, 2025 USD ($) lawsuit shares	Dec. 31, 2024 USD ($)	Dec. 31, 2025 USD ($) shares
Commitment and Contingencies
Surety Bond			$ 139,000
Surety Bond, percentage			1.50%
Indemnity agreement amount			$ 139,000
Shares Issued to Stibnite Foundation										$ 3,954
Settlement payable, current										1,000	$ 1,000	$ 1,000
Settlement payable, long-term										1,000	2,000	1,000
Amount spent on Phase 1 activities in the ASAOC										$ 0	1,500
Number of lawsuits pending \| lawsuit										2
Number of lawsuits \| lawsuit										2
Number of new plaintiffs that filed a joint stipulation \| plaintiff						2
Vendor agreement
Commitment and Contingencies
Deposits										$ 0	0	0
CWA litigation settlement agreement
Commitment and Contingencies
Settlement amount awarded to other party								$ 5,000
Litigation settlement amount payable period								4 years
Review period to request court approval of Dismissal and Settlement Agreement								45 days
CWA settlement expense									$ 5,000
Legal expense payment settlement										1,000	2,000
Settlement payable, current										1,000		1,000
Settlement payable, long-term										1,000		1,000
Idaho Power Company
Commitment and Contingencies
Deposits										15,222		15,222
Idaho Power Company \| Procurement agreement
Commitment and Contingencies
Estimated cost of new equipment							$ 90,200
Minimum contractual commitments not requiring approval							1,000
Payments for procurement contracts							$ 18,800
Additional payments for procurement contracts										7,300
ATCO Structures & Logistics (USA) Inc. \| Supply and installation agreement
Commitment and Contingencies
Capacity of the camp \| person					1,010
Amount of the vendor agreement					$ 131,700
Initial payments					$ 13,350
Deposits										12,350		12,350
Stibnite Foundation \| Related Party
Commitment and Contingencies
Cash payment made by the company										$ 450		$ 750
Shares Issued to Stibnite Foundation (in shares) \| shares	150,000									150,000		300,000
Shares Issued to Stibnite Foundation	$ 3,954									$ 4,000	$ 0
Amount of commercial production										500		$ 500
Commencement of final reclamation phase										1,000		1,000
Minimum payments to be made during commercial production										500		500
Nez Perce Tribe \| CWA litigation settlement agreement
Commitment and Contingencies
Settlement amount to be paid to the South Fork Salmon Water Quality Enhancement Fund								$ 4,000
Settlement amount to be paid to reimburse other party for legal expenses								$ 1,000
Surety letter of credit
Commitment and Contingencies
Maximum amount of standby letter of credit				$ 35,000
Expiration period				1 year
Threshold period for notice of non-extension				60 days
IDWR letter of credit
Commitment and Contingencies
Maximum amount of standby letter of credit		$ 16,400
Expiration period		1 year
Threshold period for notice of non-extension		60 days
Credit Facility		$ 55,550
Cash deposit		$ 56,550
Annual fee, interest rate		1.00%
USACE letter of credit
Commitment and Contingencies
Maximum amount of standby letter of credit			$ 4,200
Expiration period			1 year
Threshold period for notice of non-extension			90 days
Surety letter of credit and USACE letter of credit
Commitment and Contingencies
Credit Facility				$ 39,500
Cash deposit				$ 40,500
Annual fee, interest rate				1.00%
Mining Claim Assessments
Commitment and Contingencies
Annual assessment obligation										300		300
Option Payments On Other Properties
Commitment and Contingencies
Commitments payable										$ 30		$ 30