Overburden removal with draglines at mines of Maple Hill Coal Co in Pennsylvania makes profitable contour mining of four seams possible: seams are 38, 28, 24-36, and 30 in. thick; mines produce 200,000 tons/yr of medium volatile coal; coal from pits is loaded by diesel powered shovels in 15 ton trucks; blasting, loading and haulage, preparation and shipping, operation and maintenance of mine.
Stripping coal from four seams
Mechanization
Mechanization ; 24 , n 9
1960
4 pages
Article (Journal)
English
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