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Surface mining
Surface mining, including strip mining, open-pit mining and mountaintop removal mining, is a broad category of mining in which soil and rock overlying the mineral deposit (the overburden) are removed. It is the opposite of underground mining, in which the overlying rock is left in place, and the mineral removed through shafts or tunnels.
Surface mining began in the mid-sixteenth century and is practiced throughout the world, although the majority of surface mining occurs in North America.〔(【引用サイトリンク】url=http://www.worldcoal.org/coal/where-is-coal-found/ )〕 It gained popularity throughout the 20th century, and is now the predominant form of mining in coal beds such as those in Appalachia and America's Midwest.
In most forms of surface mining, heavy equipment, such as earthmovers, first remove the overburden. Next, huge machines, such as dragline excavators or Bucket wheel excavators, extract the mineral.
==Types==
There are five main forms of surface mining, detailed below.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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