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Manganese is a chemical element with the symbol Mn and atomic number of 25. It is found as the free element in nature (often in combination with iron), and in many minerals. The free element is a metal with important industrial metal alloy uses.
The Postmasburg Manganese Field's (PMF) history began with early geological mapping in 1930 and local prospecting in 1940s. [1] Systematic exploration in the 1950s led to discoveries at Gloria mine (1953), Nchwaning mine (1955), Mamatwan mine (1957), and Wessels mine (1958). Mining commenced with Gloria Mine in 1957, followed by Nchwaning in ...
Pages in category "Manganese mines in the United States" The following 5 pages are in this category, out of 5 total. This list may not reflect recent changes. A.
One of the oldest continuously running coal companies in the United States was the Pittsburg & Midway Coal Company, founded in Pittsburg, Kansas in 1885. It lasted under that name even after its move to Denver, Colorado when the Kansas mines closed, until September 2007, when Chevron which owned the company, merged it with its Molycorp Inc. coal mining division to form Chevron Mining, thus ...
The Tar Creek Superfund site is the Oklahoma section of four National Priority List (NPL) Superfund Sites that together encompass the Tri-State mining district, an old lead and zinc mining district divided by the EPA into the Tar Creek Site (Ottawa County, Oklahoma), Cherokee County Site (Cherokee County, Kansas), the Oronogo-Duenweg Site ...
First mined for iron ore in 1917, the Milford Mine reached depths of 200 feet (61 m) by 1924 under its owner George H. Crosby; 70,000 tons of ore were mined and shipped this same year. Manganese ore, an ingredient used to make steel, was shipped from the Milford site to Duluth then to steel factories in cities including Detroit and Cleveland. [3]
In 1917, three men—B.R. Jefferson, B. Edwards, and J. Marrs—discovered a manganese deposit with a high concentration of 20% to 40%. [6] Coinciding with World War I, open-pit mining operations began at the mine the same year, supplying the United States military with manganese for military equipment such as steel combat helmets.
SubTropolis is a business complex located inside of a 55,000,000-square-foot (5,100,000 m 2), 1,260-acre (5.1 km 2) mine in the bluffs north of the Missouri River in Kansas City, Missouri, United States.