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COST OF SALES (Tables)
 12 Months Ended
Dec. 31, 2023
Analysis of income and expense [abstract]  
Components of cost of sales
Years ended December 31,
Notes20232022
Operating costs1
$602.2 $526.6 
Royalties 37(b)44.8 43.8 
Depreciation expense2
216.0 240.5 
$863.0 $810.9 
1.Operating costs include mine production, transport and smelter costs, and site administrative expenses.
2.Depreciation expense excludes depreciation related to corporate office assets, which is included in general and administrative expenses.