Title: Calumet & Hecla Mining Company - Hecla Mill Machinery Drawings
Subject Headings: Engineering, Natural Resources - Mines and Mineral Resources - Copper Mines and Mining,
Description: Calumet & Hecla Mining Company Hecla Mill, heads 1 to 6 - flotation 25 feet 3 tray dorr thickeners - details.
Source of Description: Front of image
Institution: Michigan Technological University Archives and Copper Country Historical Collections
Date of Photo: 1918
Medium: still image
Color: black and white
Image No: MS005-7785
Collection Name: MS-005; Calumet and Hecla Mining Companies Drawing Collection
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