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Note 14 - Acquisition of Klondex Mines Ltd. (Tables) | 9 Months Ended
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Sep. 30, 2018
Notes Tables |
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block] |
Consideration: |  |  |  |
Cash payments |  | $ | 161,704 |
Hecla stock issued (75,276,176 shares at $3.22 per share) |  |  | 242,389 |
Hecla warrants issued |  |  | 10,155 |
Total consideration |  | $ | 414,248 |
Fair value of net assets acquired: |  |  |  |
Assets: |  |  |  |
Cash |  | $ | 12,874 |
Accounts receivable |  |  | 3,453 |
Inventory - supplies |  |  | 6,564 |
Inventory - finished goods, in-process material and stockpiled ore |  |  | 10,302 |
Other current assets |  |  | 2,583 |
Properties, plants, equipment and mineral interests |  |  | 502,285 |
Non-current investments |  |  | 1,596 |
Non-current restricted cash and investments |  |  | 9,504 |
Total assets |  |  | 549,161 |
Liabilities: |  |  |  |
Accounts payable and accrued liabilities |  |  | 17,270 |
Accrued payroll and related benefits |  |  | 10,352 |
Accrued taxes |  |  | 421 |
Lease liability |  |  | 2,080 |
Debt |  |  | 35,086 |
Asset retirement obligation |  |  | 19,571 |
Deferred tax liability |  |  | 50,133 |
Total liabilities |  |  | 134,913 |
Net assets |  | $ | 414,248 |
Business Acquisition, Pro Forma Information [Table Text Block] |
|  | Three Months Ended |  |  | Nine Months Ended |
|  | September 30, |  |  | September 30, |
(in thousands, except per share amounts) |  | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
Sales |  | $ | 156,731 |  |  | $ | 182,489 |  |  | $ | 543,741 |  |  | $ | 573,950 |
Net (loss) income |  |  | (20,735 | ) |  |  | (8,877 | ) |  |  | 4,694 |  |  |  | 2,523 |
(Loss) income applicable to common shareholders |  |  | (20,873 | ) |  |  | (9,015 | ) |  |  | 4,280 |  |  |  | (2,937 | )
Basic and diluted (loss) income per common share |  |  | (0.04 | ) |  |  | (0.02 | ) |  |  | 0.01 |  |  |  | (0.01 | )

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