Draft of the great coal-mine near Mauch Chunk exhibiting the various branches of the Rail-road leading from it, and the situation of the workings on the 18 of July 1827. I. A. Chapman. Railroad. Scale 6 perches or 99 feet to an inch.The different benches of the mine were measured along the direction of the dotted line F.M. and were found as follows. Bench D at F is the upper surface of the coal when measured. Bench C.C.C. at G is 10 feet below F. Bench B at H is 15 feet below G. the mine then gradually descends to I. Bench A on floor of the mine is 18 feet below I. The descent is the gradual from K to L. Bench marked N at M is 39 feet above L. On this side of the main opening the coal is covered in a similar manner to that on the East side and extends to an unknown distance. On this side is a narrow sandstone, forming the boundary of the present opening, called the "South Fort." From this line the ground gradually descends to the North and to the South. Spoil Bank composed of loose earth formerly covered the mine whence it has been removed. On this side of the main opening the coal is covered with earth, varying in thickness. Its depth and extent are unknown. To this intersection all the road lines (except No. 1) descend, and here the horses are attached to the wagons to haul them to the summit at slush hill. whence they descend by gravity to Mauch Chunk.
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