Warrants - Class A Warrants, Class B Warrants and Class C warrants (Details)				1 Months Ended	3 Months Ended	6 Months Ended		12 Months Ended
	Jul. 01, 2025 USD ($) shares	Jun. 25, 2025 USD ($) $ / shares shares	May 30, 2025 $ / shares shares	Jul. 31, 2025 USD ($) shares	Jun. 30, 2025 USD ($) $ / shares shares	Jun. 30, 2025 USD ($) D $ / shares shares	Jun. 30, 2024 USD ($)	Dec. 31, 2024 $ / shares shares	May 12, 2025 $ / shares	Dec. 31, 2023 shares
Warrants
Additional paid in capital, warrant issued | $					$ 33,079,000	$ 33,079,000
Proceeds from Registered Direct Offering | $						35,010,000	$ 9,000,000
Nauru Warrant cost | $					33,079,000	$ 33,079,000
2025 Registered Direct Offering
Warrants
Proceeds from Registered Direct Offering | $					$ 30,000,000
2025 Registered Direct Offering | Subsequent event
Warrants
Proceeds from Registered Direct Offering | $				$ 7,000,000
Class A Warrants
Warrants
Number of warrants outstanding					5,980,770	5,980,770		6,230,770		3,980,770
Issued								2,250,000
Class A Warrants | Direct offering
Warrants
Number of warrants outstanding					5,980,770	5,980,770
Exercise price of warrants | $ / shares					$ 2	$ 2
Value of outstanding warrants | $					$ 5,100,000	$ 5,100,000
Class B Warrants
Warrants
Number of warrants outstanding					3,615,000	3,615,000		7,450,000
Value of outstanding warrants | $					$ 3,400,000	$ 3,400,000
Warrants term					5 years	5 years
Issued						2,500,000
Class B Warrants | 2024 Registered Direct Offering
Warrants
Exercise price of warrants | $ / shares								$ 2
Number of shares issuable per warrant								7,450,000
Class C Warrants
Warrants
Number of warrants outstanding					10,003,333	10,003,333
Exercise price of warrants | $ / shares					$ 4.5	$ 4.5
Number of shares issuable per warrant					0	0
Consecutive trading days for redemption of public warrants | D						20
Issued					10,003,333
Threshold cancellation of unexercised warrants offering | $ / shares					$ 7	$ 7
Redemption price per warrant (in dollars per share) | $ / shares						$ 0.0001
Minimum threshold written notice period for redemption of public warrants						10 days
Additional paid in capital, warrant issued | $					$ 10,200,000
Class C Warrants | 2025 Registered Direct Offering
Warrants
Exercise price of warrants | $ / shares									$ 3
Issued					10,003,333
Class C Warrants | 2025 Registered Direct Offering | Subsequent event
Warrants
Issued	2,330,000			2,330,000
Proceeds from Registered Direct Offering | $	$ 7,000,000
Korea Zinc Warrants
Warrants
Number of warrants outstanding					6,868,181	6,868,181
Exercise price of warrants | $ / shares		$ 7
Number of shares issuable per warrant					0	0
Consecutive trading days for redemption of public warrants | $						20
Issued		6,868,181
Threshold cancellation of unexercised warrants offering | $ / shares					$ 10	$ 10
Redemption price per warrant (in dollars per share) | $ / shares						$ 0.0001
Minimum threshold written notice period for redemption of public warrants						10 days
Additional paid in capital, warrant issued | $		$ 3.35			$ 11,500,000
Nauru Warrants
Warrants
Exercise price of warrants | $ / shares			$ 4.72
Share price | $ / shares			$ 3.6
Issued			9,146,268
Additional paid in capital, warrant issued | $						$ 33,100,000
Nauru Warrant cost | $						$ 33,100,000