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State Wide
Mine Shafts of MichiganMining Engineering at Michigan Tech - - -INDEX Mining History: Mine Headframes and Structures of Michigan Michigan has four major metallic mining ranges, the "Copper Country" Mining District of ...
http://www.mg.mtu.edu/mining/mining/mining/mining/shaft0.htm
Inside Michigan
Michigan Hydraulic Dredging (Cheboygan)Michigan Hydraulic Dredging, an experienced and professional dredging company used for trout ponds, complete lake restorations, and many other projects.
http://www.michhydraulicdredging.com/
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