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Note 13 - Acquisition of Klondex Mines Ltd. - Properties, Plants, Equipment and Mineral Interests (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Properties, plants, equipment and mineral interests | $ 2,455,511 | $ 2,520,004
Nevada Operations [Member] |  |
Properties, plants, equipment and mineral interests | 524,800 |
Beyond Proven and Probable Reserves [Member] | Nevada Operations [Member] |  |
Properties, plants, equipment and mineral interests | 382,200 |
Mining Properties and Mineral Rights [Member] | Nevada Operations [Member] |  |
Properties, plants, equipment and mineral interests | 57,700 |
Mills and Tailings Facilities [Member] | Nevada Operations [Member] |  |
Properties, plants, equipment and mineral interests | 46,400 |
Buildings and Equipment [Member] | Nevada Operations [Member] |  |
Properties, plants, equipment and mineral interests | 33,000 |
Land [Member] | Nevada Operations [Member] |  |
Properties, plants, equipment and mineral interests | 2,900 |
Asset Retirement Obligation [Member] | Nevada Operations [Member] |  |
Properties, plants, equipment and mineral interests | $ 2,600 |

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- Definition Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(14)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(8)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(13)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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