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A Bronze Age fire-set pit. Fire-setting is a method of traditional mining used most commonly from prehistoric times up to the Middle Ages. Fires were set against a rock face to heat the stone, which was then doused with liquid, causing the stone to fracture by thermal shock. Rapid heating causes thermal shock by itself—without subsequent ...
The plant had an internal railway more than 10 miles long, used to transfer material between departments. The company produced conveyor belts, power transmission systems, mining machinery and locomotives. [9] At the start of World War One, the company was the largest producer of mining locomotives and coal cutting machines in the world. [10]
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The United Mine Workers of America (UMW or UMWA) is a North American labor union best known for representing coal miners. Today, the Union also represents health care workers, truck drivers, manufacturing workers and public employees in the United States and Canada. [1]
Thunderbird Archaeological District and Jasper quarry, near Limeton, Virginia, is an archaeological district described as consisting of "three sites—Thunderbird Site, the Fifty Site, and the Fifty Bog. It is located in Warren County Virginia, near modern-day Front Royal, in the Shenandoah River Valley.
The Central Ohio Coal Company, once a subsidiary of American Electric Power, is now a subsidiary of CONSOL Energy. [1] At one time, they owned and operated Big Muskie in the Cumberland, Ohio area. [2]
Open-pit mining, also known as open-cast or open-cut mining and in larger contexts mega-mining, [1] is a surface mining technique that extracts rock or minerals from the earth. Open-pit mines are used when deposits of commercially useful ore or rocks are found near the surface where the overburden is relatively thin. In contrast, deeper mineral ...
Lime pit in Judaea. A limepit is either a place where limestone is quarried, or a man-made pit used to burn lime stones in the same way that modern-day kilns and furnaces constructed of brick are now used above ground for the calcination of limestone (calcium carbonate, CaCO 3) and by which quicklime (calcium oxide, CaO) is produced, an essential component in waterproofing and in wall ...