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Isometric sketch of Calumet conglomerate lode

Metal Trade, Copper Industry and Trade, Copper Mines and Mining, Engineering, Surveying, Isometric sketch of Calumet conglomerate lode [Sketch map showing underground workings on the Calumet conglomerate ore body. Sketch shows locations of vertical and incline shafts.]

Scanned: July 5, 2006


Sketch of open stope in Calumet conglomerate lode

Metal Trade, Copper Industry and Trade, Copper Mines and Mining, Engineering, Surveying, Sketch of open stope in Calumet conglomerate lode [Sketch map showing underground workings on the Calumet conglomerate ore body. Sketch shows relation of shaft, shaft pillar, workig stope and older, caved stope.]

Scanned: July 5, 2006


Pyramid cut used on Calumet conglomerate lode drifting

Metal Trade, Copper Industry and Trade, Copper Mines and Mining, Engineering, Surveying, Pyramid cut used on Calumet conglomerate lode drifting [Sketch map showing number and direction of shot holes drilled within a typical drift of the underground workings on the Calumet conglomerate ore body. After drilling, these holes would be filled with explosives and fuses which would ignite the charges in the numeric order indicated.]

Scanned: July 5, 2006


Underground mine map, Forest Mining Company

Metal Trade, Copper Industry and Trade, Copper Mines and Mining, Engineering, Surveying, Section of the Forest Mine, Oct. 1st, 1852 [Map showing underground workings of the Forest Mine near Rockland, Michigan. Credit line at bottom reads "B.W. Thayer & Co. List. Boston." Map shows several shafts, winzes and drifts and includes illustrations of hoisting apparatus. Note is also made of "Indian Diggings" along surface.]

Scanned: July 3, 2006


Map of the Calumet Conglomerate Lode

Metal Trade, Copper Industry and Trade, Copper Mines and Mining, Engineering, Surveying, Map of the Calumet Conglomerate Lode [Map shows surface ownership of property with indication of location and direction of major shafts. Includes property of the Calumet and Hecla, La Salle, Osceola, Tamarack, Allouez, Centennial and Laurium mining companies.]

Scanned: July 3, 2006