CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Cash flows from operating activities:
Net (loss) income	$ (4,933)	$ 2,680
Adjustments to reconcile net (loss) income to net cash from operating activities:
Deferred income taxes	(4,598)	1,275
Depreciation and amortization	12,598	7,641
Stock-based compensation	870	1,214
Other operating adjustments	(368)	(293)
Changes in operating assets and liabilities:
Accounts receivable	4,999	(3,886)
Inventories	(2,274)	(8,464)
Prepaid expenses and other current assets	(437)	97
Other non-current assets	(256)	(2,012)
Accounts payable and other accrued liabilities	(2,644)	6,183
Mining royalty and income taxes payable, net	159	(3,328)
Net cash provided by operating activities	3,116	1,107
Cash flows from investing activities:
Capital expenditures	(10,600)	(21,438)
Other investing activities	4	1
Net cash used in investing activities	(10,596)	(21,437)
Cash flows from financing activities:
Proceeds from the exercise of stock options		98
Proceeds from issuance of stock	11,900	21,807
Dividends paid	(1,357)	(617)
Repayment of loans payable	(435)	(385)
Repayment of finance leases	219	204
Net cash provided by financing activities	9,889	20,699
Effect of exchange rate changes on cash and cash equivalents	(157)	(192)
Net increase in cash and cash equivalents	2,252	177
Cash and cash equivalents at beginning of period	11,076	7,762
Cash and cash equivalents at end of period	13,328	7,939
Supplemental Cash Flow Information
Interest expense paid	56	79
Income and mining taxes paid	1,066	2,897
Non-cash investing activities:
Change in capital expenditures in accounts payable	(3,120)	(1,214)
Change in estimate for asset retirement costs	$ 1,097	638
Equipment purchased through loan payable		330
Equipment purchased under finance leases		$ 56