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Coal Measures and Coal Mining in Iowa, including paleontology and a discussion on the coal formation; also the methods of mining by Russell T. Hartman, 1898

Coal Measures and Coal Mining in Iowa by Russell T. Hartman, 1898, Page 185

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[page]185.[/page] fourth item, together with the question of transportation depends the location of the mine. Since, as has been seen, the coal beds are meniscus-shaped, it is best for two chief reasons to sink the shaft in such a place that it will penetrate to the lowest portion of the meniscus. First:-- In any kind of traffic in which there is one trip with a load and the return trip empty it is best to have the road or track arranged so the load will pass in the easier direction. So it is in shaft coal mines, all the coal is hauled to the bottom of the shaft from whence it is hoisted by machinery to the surface. It, therefore, can be seen readily why the shaft should end at the lowest part of the coal seam; that is, then all of the underground
 
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