Cost of Sales

12 Months Ended

Dec. 31, 2022

Analysis of income and expense [abstract]

Cost of Sales

Cost of Sales

	Year ended December 31,
	2022		2021
Materials	$	41,848	$	26,343
Salaries and benefits	50,216		39,497
Depreciation and depletion	58,656		47,002
Contracted services	32,239		21,373
Maintenance costs	26,373		18,162
Utilities	13,034		10,721
Sales expense	9,501		7,243
Other costs(1)	7,350		716
	$	239,217	$	171,057

(1)     Other costs in the year ended December 31, 2022 included $6.1 million of copper concentrates acquired from one of the Company's customers to settle accounts receivables in arrears. This concentrate was subsequently sold to a different customer for $6.0 million included in revenues.