Constellation Similarity Assertions

The mines of Michigan's Copper Country were generally self-reliant; however, there were at least three things they could not find along the Keweenaw Peninsula - coal, iron and explosives. These items were transported, often at great expense, to Michigan from elsewhere. In an attempt to lower these costs, the controlling interests of the Tamarack and Osceola Mines, and later Calumet & Hecla Consolidated Copper Company invested in the area's first explosives plant at Woodside in 1884. When this plant became obsolete and unprofitable, Calumet & Hecla, along with Dupont proceeded to build a new and modern plant in Senter, Michigan - the Atlas Powder Company.

From the description of Atlas Powder Company Records, 1890-1973. (Michigan Technological University). WorldCat record id: 745449934

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