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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Cash flows from operating activities:    
Net income $ 5,339 $ 68
Net income from discontinuing operations   3,280
Net income (loss) from continuing operations 5,339 (3,212)
Adjustments to reconcile net income from continuing operations to net cash from operating activities:    
Deferred income taxes (74) (4,617)
Depreciation and amortization 11,405 13,690
Stock-based compensation 711 1,175
Other operating adjustments 475 (831)
Changes in operating assets and liabilities:    
Accounts receivable (721) 5,185
Inventories (810) 838
Prepaid expenses and other current assets (1,038) (178)
Accounts payable and other accrued liabilities 2,730 (897)
Mining royalty and income taxes payable, net 3,855 935
Net cash provided by operating activities from continuing operations 21,872 12,088
Cash flows from investing activities:    
Capital expenditures (15,217) (6,546)
Other investing activities   133
Net cash used in investing activities from continuing operations (15,217) (6,413)
Cash flows from financing activities:    
Proceeds from the exercise of stock options 263  
Proceeds from issuance of stock   18,673
Dividends paid (2,481) (2,062)
Cash related to the Spin-off   (7,616)
Other financing activities 3 (6)
Net cash (used in) provided by financing activities from continuing operations (2,215) 8,989
Effect of exchange rate changes on cash and cash equivalents from continuing operations (301) (303)
Cash flows from discontinued operations:    
Net cash used in operating activities 0 5,198
Net cash used in investing activities 0 (6,368)
Net increase in cash and cash equivalents 4,139 13,191
Cash and cash equivalents of continuing operations at beginning of period 25,405 10,210
Cash and cash equivalents of continuing operations at end of period $ 29,544 $ 23,401