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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

X

- 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

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