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RELATED PARTY TRANSACTIONS (Tables)
9 Months Ended
Sep. 30, 2024
Related Party Transactions [Abstract]  
Schedule of Related Party Revenue and Cost of Sales The Company’s related-party revenue and cost of sales were as follows:
For the three months ended September 30,For the nine months ended September 30,
(in thousands)2024202320242023
Revenue:
Rare earth concentrate$43,053 $51,502 $107,555 $203,186 
NdPr oxide and metal$5,061 $— $7,306 $— 
Cost of sales (excluding depreciation, depletion and amortization)
$38,139 $21,829 $78,848 $66,817