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The Michigan Limestone and Chemical Company operated the world's largest limestone quarry (Michigan Limestone; a/k/a the "Calcite Quarry"; "Calcite Plant and Mill"; and "Carmeuse Lime and Stone"), which is located near Rogers City in Presque Isle County, Michigan. It was formed and organized in 1910; however, production did not begin until 1912.
Fordite, also known as Detroit agate, Motor City agate, [1] paint rock, or paint slag, [2] is a lapidarist term for polished pieces of finely layered paint masses from automobile factories. The masses consist of automotive paint which has hardened sufficiently to be cut and polished.
The Michigan State Geologist Douglass Houghton (later to become mayor of Detroit) reported on the copper deposits in 1841, which quickly began a rush of prospectors. Mining took place along a belt that stretched about 100 miles southwest to northeast through Ontonagon , Houghton , and Keweenaw counties.
Name County Years Material Coordinates Adventure mine: Ontonagon: 1850–1920: copper: Alabastine Mine: Kent: 1907– gypsum: Arcadian mine: Houghton: 1898–1908: copper
Halite (rock salt) occurs in beds of the Salina Formation and the Detroit River Group . The Detroit salt mine has mined rock salt from beneath the Detroit metropolitan area since 1906. [ 2 ] Brine recovered from wells in the Michigan basin has been used as a commercial source of potassium salts, bromine , iodine , calcium chloride , and ...
These rocks continue northwestwards under Lake Huron, and reappear in the northern part of the southern peninsula of Michigan, north of Alpina [3] (as shown in the map on the right). To the west, its equivalent, the Detroit River Group, [ 4 ] outcrops near Detroit and Windsor just north of the Lake Erie shoreline (as shown in the map on the right).
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Sign commemorating the Ontonagon Boulder Location of Ontonagon Boulder. The Ontonagon Boulder (/ˌɒntəˈnɑːɡən ˈboʊldəɹ/, Chippewa: Misko-biiwaabik) is a 3,708-pound (1,682 kg) boulder of native copper originally found in the Upper Peninsula of Michigan, United States, and now in the possession of the Department of Mineral Sciences, National Museum of Natural History, Smithsonian ...
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