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Mountaintop removal coal mining uses tools like explosives, machinery, etc. to remove large amounts of topsoil, exposing coal ores underneath. [21] After topsoil is removed in the mining process, sulfur and other trace metals such as arsenic, lead, magnesium, etc. are exposed to the surrounding air which can last for decades. [ 21 ]
Arch Coal was formed in July 1997 through the merger of publicly traded Ashland Coal, Inc. and privately held Arch Mineral Corporation. Arch Mineral had its origins in 1969, when it was formed as a partnership between Ashland Oil (now Ashland Inc.) and the H.L.Hunt family of Dallas, Texas; Ashland Coal was formed in 1975 as a wholly owned subsidiary of Ashland Oil.
Allis-Chalmers was a U.S. manufacturer of machinery for various industries.Its business lines included agricultural equipment, construction equipment, power generation and power transmission equipment, and machinery for use in industrial settings such as factories, flour mills, sawmills, textile mills, steel mills, refineries, mines, and ore mills.
By that time, Ashland had developed a diverse business portfolio which included petroleum refining and marketing; chemicals; crude oil exploration and production; coal mining; road construction, heavy equipment manufacturing, and insurance marketing. [18] Most of that portfolio was related to Ashland's core refining and marketing business.
P&H Mining Equipment sells drilling and material handling machinery under the "P&H" trademark. The firm is an operating subsidiary of Joy Global Inc. In 2017 Joy Global Inc. was acquired by Komatsu Limited of Tokyo, Japan, and is now known as Komatsu Mining Corporation and operates as a subsidiary of Komatsu.
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Komatsu Limited and Dresser Industries established Komatsu Dresser to make mining tractors, construction equipment and related equipment. [15] This 50-50 ownership lasted from September 1988 to August 1994, when Komatsu bought out Dresser's share. [15] By 1993, it generated sales of more than US$4 billion, and employed 31,800 people in fifty ...
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