SUPPLEMENTAL FINANCIAL INFORMATION

The components of revenues are as follows:

The Company had three major customers to which its sales for the year were as follows: 2018 - $24.52 million; $5.03 million; $1.24 million; (2017 (three major customers) - $13.08 million; $6.99 million; $4.40 million); (2016 (three major customers) - $33.36 million; $8.69 million; $7.00 million).

The Company’s revenues by country of customer for the current year were as follows: 2018 - $25.76 million - U.S.; Other - $5.03 million; (2017 - $20.07 million - U.S.; Other - $4.40 million) (2016 -$50.76 million - U.S.; Other - $3.69 million).

Deferred revenue at December 31, 2018 of $2.72 million (2017 - $2.47 million) relates to proceeds received on toll materials in advance of required activity.

The components of other (expense) income are as follows:



	Years ended December 31,
	2018			2017			2016
Interest income	$	336		$	161		$	143
Change in value of marketable securities	769			509			—
Change in value of warrant liabilities	(3,469		)	784			420
Change in value of convertible Debentures	(612		)	(940		)	(407		)
Gain on settlement of loans and borrowings	—			—			424
Gain on assets held for sale	341			—			—
Insurance settlement	—			—			223
Sales and property tax refunds	—			—			176
Gain on sale of mineral properties	—			—			316
Sale of surplus assets	293			1,913			—
Other	14			142			(96		)
Other (expense) income	$	(2,328	)	$	2,569		$	1,199

The components of accounts payable and accrued liabilities are as follows:



	December 31, 2018		December 31, 2017
Accounts payable	$	1,881	$	762
Payroll liabilities	1,928		835
Other accrued liabilities	4,112		4,852
Accounts payable and accrued liabilities	$	7,921	$	6,449