Abstract Photograph collection, 1892-1967, of the Calumet and Hecla Mining Company. Images document all aspects of mining company activity: rocks, drilling and blasting, timbering, tramming, rockhouses, milling, smelting, electrolytic, dredge, leaching, docks and shipping, engines and compressors, pumps, surface shops, and power plants. Also includes photographs from more than twenty Calumet and Hecla companies, including the mines (Calumet and Hecla, Ahmeek, Allouez, Centennial, Isle Royale,...