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Inventories
12 Months Ended
Dec. 31, 2018
Classes Of Inventories [Abstract]  
Inventories

7. Inventories

20182017
Uranium
Concentrate$255,373$820,426
Broken ore51,54547,083
306,918867,509
NUKEM85,65413,801
Fuel services75,22368,456
Total$467,795$949,766

Cameco expensed $1,501,000,000 of inventory as cost of sales during 2018 (2017 - $1,601,000,000). Included in cost of sales is a $29,296,000 net write-down to reflect net realizable value (2017 - $8,662,000 net write-down).