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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($)
shares in Thousands, $ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Statement of Financial Position [Abstract]    
Common shares, issued (in shares) 202,786 202,369
Common shares, outstanding (in shares) 202,786 202,369
Assets [1] $ 5,907,813 $ 5,189,020
Cash and cash equivalents 409,332 387,882
Trade and other receivables 121,652 124,438
Inventories, current 586,162 464,074
Mineral properties, plant and equipment, net 4,116,070 3,782,867
Inventories, noncurrent 495,035 291,212
Other non-current assets 79,333 78,305
Liabilities [1] 1,763,320 1,242,159
Accounts payable 41,203 30,538
Accrued liabilities and other 186,176 139,381
Reclamation and remediation liabilities, current 28,307 33,166
Finance lease liabilities, non-current 77,622 81,373
Reclamation and remediation liabilities, non-current 604,825 312,671
Deferred income tax liabilities 320,311 327,277
Other non-current liabilities 39,160 25,958
Nonrelated Party    
Prepaids and other current assets 28,308 23,175
Related Party    
Prepaids and other current assets 24,532 0
Variable Interest Entity, Primary Beneficiary    
Assets 3,452,200 3,426,100
Cash and cash equivalents 10,900 17,500
Trade and other receivables 4,500 2,600
Inventories, current 58,100 59,200
Mineral properties, plant and equipment, net 3,091,500 3,089,500
Inventories, noncurrent 245,300 246,500
Other non-current assets 3,300 7,200
Liabilities 573,200 538,400
Accounts payable 16,400 8,500
Accrued liabilities and other 27,600 23,500
Reclamation and remediation liabilities, current 18,000 33,100
Finance lease liabilities, non-current 77,600 81,400
Reclamation and remediation liabilities, non-current 220,700 155,000
Deferred income tax liabilities 167,800 197,700
Other non-current liabilities 45,100 39,400
Variable Interest Entity, Primary Beneficiary | Nonrelated Party    
Prepaids and other current assets $ 14,100 3,700
Variable Interest Entity, Primary Beneficiary | Related Party    
Prepaids and other current assets   $ 0
[1] The consolidated assets as of September 30, 2025 and December 31, 2024 include $3,452.2 million and $3,426.1 million, respectively, of assets of variable interest entities (“VIEs”) that can only be used to settle the obligations of the VIEs. As of September 30, 2025 and December 31, 2024, the assets include Cash and cash equivalents of $10.9 million and $17.5 million, respectively; Trade and other receivables of $4.5 million and $2.6 million, respectively; Inventories, current of $58.1 million and $59.2 million, respectively; Prepaids and other current assets of $14.1 million and $3.7 million, respectively; Prepaids, related party of $24.5 million and nil, respectively; Mineral properties, plant and equipment, net of $3,091.5 million and $3,089.5 million, respectively; Inventories, non-current of $245.3 million and $246.5 million, respectively; and Other non-current assets of $3.3 million and $7.2 million, respectively. The consolidated liabilities as of September 30, 2025 and December 31, 2024 include $573.2 million and $538.4 million, respectively, of liabilities of VIEs whose creditors have no recourse to the Company. As of September 30, 2025 and December 31, 2024, the liabilities include Accounts payable of $16.4 million and $8.5 million, respectively; Accrued liabilities and other of $27.6 million and $23.5 million, respectively; Reclamation and remediation liabilities, current of $18.0 million and $33.1 million, respectively; Finance lease liabilities, non-current of $77.6 million and $81.4 million, respectively; Reclamation and remediation liabilities, non-current of $220.7 million and $155.0 million, respectively; Deferred income tax liabilities of $167.8 million and $197.7 million, respectively; and Other non-current liabilities of $45.1 million and $39.4 million, respectively.