Power shovel
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There were three of the giant machines at issue: Various coalfields in the tri-state OH-PA-WV area are shown in color, overlaying county boundaries — a region where coal has been mined for decades in the Appalachian Coal Basin. Coal is found in 32 counties in Ohio, though primarily in the southeastern part of the state which is located on the northwestern edge of the Appalachian Coal Basin, one of the largest coalfields in the U. Coal has been mined in Ohio since the early s, initially with crude mining techniques working surface outcroppings, to more sophisticated mechanized technologies that evolved following WWI and WWII. Most of the mining in Ohio through the s was in deep mines or shaft mines that bore into mountainsides.