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Production Costs (Tables)
 12 Months Ended
Dec. 31, 2020
Analysis of income and expense [abstract]  
Schedule of production costs
Production costs are comprised of the following: 
20202019
Consumption of raw materials and consumables$284,215 $311,812 
Employee compensation and benefits expense (1)
262,753 271,684 
Contractors and outside services125,242 117,018 
Utilities39,242 41,674 
Other expenses18,198 74,469 
Changes in inventories (2)(3)
(32,978)24,640 
 $696,672 $841,297 
(1)Employee compensation and benefits expense is comprised of:
 20202019
Wages, salaries and bonuses$317,668 $288,015 
Share-based compensation3,024 4,448 
Total employee compensation and benefit expenses320,692 292,463 
Less: Expensed within Care and Maintenance expenses(37,695)— 
Less: Expensed within General and Administrative expenses(17,180)(16,156)
Less: Expensed within Exploration expenses(3,064)(4,623)
Employee compensation and benefits expenses included in production costs$262,753 $271,684 
(2)Includes NRV adjustments to inventory to reduce production costs by $16.2 million for the year ended December 31, 2020 (2019 - reduce by $0.4 million).
(3)Includes the sale of inventory with fair value increases of $3.5 million for the year ended December 31, 2020 (2019 - $43.4 million) resulting from the Tahoe Acquisition (Note 8).