Notes on a “Wash-out” found in the Pleasley and Teversall Collieries

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Abstract
The Top Hard Coal-seam of the Midland Coal-field is being worked at these collieries at a depth of 217 yards at; Teversall, and 514 yards at the Pleasley pits; the average thickness of the seam is 5 feet, with a band of cannel in the middle, varying from 4 to 14 inches. The general dip of the coal-seam is 1 in 12 to the N.E. The “Wash-out” was first met with in the Teversall workings, about half a mile east of those pits, and from this point it has been proved to run for a distance of a mile and a quarter in a northeasterly direction, as shown in the plan, fig. 1. The coal has now been worked off on each side of the “Wash” for a length of over 600 yards in the Teversall mine, and for 200 yards in the Pleasley workings, the boundary of the “Wash” being shown on the plan by strong lines where actually proved. Headings have been driven through the “Wash” at five different places, four of these from the Teversall and one from the Pleasley colliery. In each case these headings were driven next the ordinary sagar-clay floor of the mine; this under-clay is about 18 inches thick, and contains numerous nodules of ironstone. Careful sections of these “headings” have been taken, plans of which are given. Section No. 1 (fig. 2).—At a distance of about 60 yards from the “Wash” the coal commenced to thicken; this continued until immediately adjoining the

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