Title: Calumet and Hecla
Subject Headings: Metal Trade - Copper Industry and Trade - Copper Mines and Mining, Manufacturing Process, Manpower - Labor
Description: Sand leaching plant where copper is removed from sand by ammonia process. Calumet & Hecla mills, Lake Linden, MI.
Source of Description: Front of slide
Institution: Michigan Technological University Archives and Copper Country Historical Collections
Donor: Universal Oil Products
Date of Photo: 1915
Medium: still image
Color: black and white
Size: 8.3 cm x 10.3 cm
Image No: MS003-032A-25-74
Collection Name: Calumet and Hecla Photograph Collection
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