Warrants - Fair value measurements assumptions of warrants (Details)	Aug. 04, 2025 Y $ / shares	Jul. 01, 2025 Y $ / shares shares	Jun. 25, 2025 $ / shares Y shares	Jun. 10, 2025 Y $ / shares shares	May 30, 2025 $ / shares Y	May 22, 2025 $ / shares Y shares	Feb. 06, 2025 $ / shares shares	Jan. 30, 2025 $ / shares shares	Jan. 29, 2025 $ / shares shares	Nov. 14, 2024 Y $ / shares shares
Class B Warrants
Warrants
Units issued \| shares							950,000	650,000	900,000	7,450,000
Fair value per warrant							$ 1.22	$ 1.11	$ 0.98	$ 0.6
Class B Warrants \| Exercise price
Warrants
Measurement input							2	2	2	2
Class B Warrants \| Share price
Warrants
Measurement input							1.82	1.65	1.48	0.96
Class B Warrants \| Call price threshold
Warrants
Measurement input							5	5	5	5
Class B Warrants \| Volatility
Warrants
Measurement input							1.0766	1.0766	1.0766	1.0938
Class B Warrants \| Term (years)
Warrants
Measurement input \| Y										5
Class B Warrants \| Risk-free rate
Warrants
Measurement input							0.0423	0.0423	0.0423	0.0423
Class B Warrants \| Dividend yield
Warrants
Measurement input							0	0	0	0
Class C Warrants
Warrants
Units issued \| shares		2,330,000	1,003,334	6,666,666		2,333,333
Fair value per warrant		$ 3.01	$ 3.88	$ 2.15		$ 2.18
Class C Warrants \| Exercise price
Warrants
Measurement input		4.5	4.5	4.5		4.5
Class C Warrants \| Share price
Warrants
Measurement input		5.94	7.49	4.24		4.3
Class C Warrants \| Volatility
Warrants
Measurement input		1.0626	1.0114	1.1849		1.1849
Class C Warrants \| Term (years)
Warrants
Measurement input \| Y		2.88	2.88	2.92		2.92
Class C Warrants \| Risk-free rate
Warrants
Measurement input		0.0368	0.0367	0.0387		0.0387
Class C Warrants \| Dividend yield
Warrants
Measurement input		0	0	0		0
Korea Zinc Warrants
Warrants
Fair value per warrant			$ 3.35
Korea Zinc Warrants \| Exercise price
Warrants
Measurement input			7
Korea Zinc Warrants \| Share price
Warrants
Measurement input			7.49
Korea Zinc Warrants \| Volatility
Warrants
Measurement input			1.0055
Korea Zinc Warrants \| Term (years)
Warrants
Measurement input \| Y			3
Korea Zinc Warrants \| Risk-free rate
Warrants
Measurement input			0.0367
Korea Zinc Warrants \| Dividend yield
Warrants
Measurement input			0
Nauru Warrants
Warrants
Fair value per warrant					$ 3.62
Nauru Warrants \| Exercise price
Warrants
Measurement input					4.72
Nauru Warrants \| Share price
Warrants
Measurement input					4.47
Nauru Warrants \| Volatility
Warrants
Measurement input					1.1471
Nauru Warrants \| Term (years)
Warrants
Measurement input \| Y					5
Nauru Warrants \| Risk-free rate
Warrants
Measurement input					0.0389
Nauru Warrants \| Dividend yield
Warrants
Measurement input					0
Tonga Warrants
Warrants
Fair value per warrant	$ 5
Tonga Warrants \| Exercise price
Warrants
Measurement input	5.87
Tonga Warrants \| Share price
Warrants
Measurement input	5.65
Tonga Warrants \| Volatility
Warrants
Measurement input	1.1233
Tonga Warrants \| Term (years)
Warrants
Measurement input \| Y	8
Tonga Warrants \| Risk-free rate
Warrants
Measurement input	0.04
Tonga Warrants \| Dividend yield
Warrants
Measurement input	0