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Derivative financial instruments (Tables)
 12 Months Ended
Dec. 31, 2025
Derivative Financial Instruments [Abstract]  
Schedule of Derivative Assets
December 31, 2025December 31, 2024
Assets
Foreign currency forward contracts - Term Facility (d(iii))$12,033 $— 
Warrants398 52 
Total derivative assets$12,431 $52 

Classified as:December 31, 2025December 31, 2024
Current$2,051 $52 
Non-current10,380 — 
$12,431 $52 
Schedule of Derivative Liabilities
December 31, 2025December 31, 2024
Liabilities
Foreign currency collars (a)$247 $194 
Euro forward contracts (b)— 2,353 
Gold collars (c)— 20,465 
Gold commodity swaps - Term Facility (d(i))69,528 18,149 
Copper commodity swaps - Term Facility (d(i))23,087 3,165 
Interest rate swaps - Term Facility (d(ii))8,255 12,167 
Foreign currency forward contracts - Term Facility (d(iii))— 4,837 
Gold collars - Term Facility (d(iv))12,016 — 
Total derivative liabilities$113,133 $61,330 

Classified as:December 31, 2025December 31, 2024
Current$96,879 $25,587 
Non-current16,254 35,743 
$113,133 $61,330 
Schedule of Outstanding Foreign Currency Collars
As at December 31, 2025, the Company's outstanding foreign currency collars were as follows:
2026
Canadian dollar collars
   Canadian dollar contracts $96,012 
   Weighted average put strike price (USD:CDN)1.30
   Weighted average call strike price (USD:CDN)1.41
Euro collars
   Euro contracts$82,800 
   Weighted average put strike price (EUR:USD)1.25
   Weighted average call strike price (EUR:USD)1.15
Schedule of Movement of Derivative Assets (Liabilities)
Year ended December 31,
20252024
Opening derivative (liability) asset$(194)$1,338 
Change in fair value2,674 (1,537)
Settlements(2,727)5 
Closing derivative liability$(247)$(194)
The foreign currency forward contracts have not been designated as hedging instruments. Changes in the fair value of foreign currency forward contracts outstanding during the year ended December 31, 2025 were as follows:
Year ended December 31,
20252024
Opening derivative (liability) asset$(2,353)$1,478 
Change in fair value1,693 (5,088)
Settlements660 1,257 
Closing derivative (liability) asset$— $(2,353)
Changes in the fair value of gold commodity swaps outstanding during the year ended December 31, 2025 were as follows:
Year ended December 31,
Gold commodity swaps20252024
Opening derivative liability$(18,149)$(2,966)
Change in fair value(51,379)(15,183)
Closing derivative liability$(69,528)$(18,149)

Changes in the fair value of copper commodity swaps outstanding during the year ended December 31, 2025 were as follows:
Year ended December 31,
Copper commodity swaps20252024
Opening derivative liability$(3,165)$(1,032)
Change in fair value(19,922)(2,133)
Closing derivative liability$(23,087)$(3,165)
Changes in the fair value of interest rate swaps outstanding during the year ended December 31, 2025 were as follows:
Year ended December 31,
20252024
Opening derivative liability$(12,167)$(11,605)
Change in fair value961 850 
Settlements2,951 (1,412)
Closing derivative liability$(8,255)$(12,167)
Changes in the fair value of foreign currency forward contracts outstanding during the year ended December 31, 2025 were as follows:
Year ended December 31,
20252024
Opening derivative (liability) asset$(4,837)$6,229 
Change in fair value16,870 (11,066)
Closing derivative asset (liability)$12,033 $(4,837)
Changes in the fair value of the gold collars are recorded in other (expense) income.
Year ended December 31,
20252024
Opening derivative asset$— $— 
Change in fair value(12,016)— 
Closing derivative liability$(12,016)$— 
Schedule of Outstanding Gold Collars
Changes in the fair value of gold collars outstanding during the year ended December 31, 2025 were as follows:
Year ended December 31,
20252024
Opening derivative liability$(20,465)$(3,026)
Change in fair value(133,030)(17,439)
Settlements153,495 — 
Closing derivative liability$— $(20,465)