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Distributed Operations - Summary of Carrying Value of Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
 [1]
Oct. 03, 2023
Jan. 01, 2023
 [1]
Dec. 31, 2022
Dec. 31, 2021
Disclosure of Distributed Operations [line Items]            
Cash and cash equivalents $ 85,543 $ 122,293   $ 194,471 $ 194,471 $ 510,607
Receivables, prepaids and deposits 3,631 4,609   3,990    
Property, plant and equipment 8,988 9,245   9,026    
Exploration and evaluation assets 343,794 343,092   348,645    
TOTAL ASSETS 1,131,223 1,055,026   1,016,548    
Decommissioning provision 0 0   (478)    
Other liabilities (21) (496)   (7,951)    
TOTAL LIABILITIES 240,293 226,095   232,546    
Net assets distributed upon separation $ 1,131,223 $ 1,055,026   $ 1,016,548    
Lithium Americas            
Disclosure of Distributed Operations [line Items]            
Cash and cash equivalents     $ 275,499      
Receivables, prepaids and deposits     16,877      
Property, plant and equipment     131,182      
Exploration and evaluation assets     770      
Investment in Green Technology Metals     3,590      
Investment in Ascend Elements     8,582      
TOTAL ASSETS     436,500      
Accounts payable and accrued liabilities     (17,157)      
Current portion of long-term liabilities     (808)      
GM transaction derivative liability     (370)      
Decommissioning provision     (601)      
Other liabilities     (4,617)      
TOTAL LIABILITIES     23,553      
Net assets distributed upon separation     $ 412,947      
[1] The comparative information has been reclassified as discussed in Note 13 and Note 14.