432 -KE. J. C. B. HENDY ON A " AVASH-OUT " POUND 



25. XoTEs 071 a " Wash-out "/ott/icZ in the Pleasley and Teversall 

 Collieries, Derbyshike and Notts *. By J. C. B. Hendy, Esq. 

 (Eead April 16, 18U0.) 



(Commimicated by Dr. W. T. Blanfokd, RE.S., F.G.S.) 



The Top Hard Coal-seam of the Midland Coal-field is being worked 

 at these collieries at a depth of 217 yards ar 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 north- 

 easterly direction, as shown in the plan, tig. 1. 



The coal has now been worked off on each side of the "• Wash " 

 for a length of over 6u0 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 imme- 

 diately adjoining the " AYash " the seam reached a height of 9 feet. 

 On nearing the "• Wash " a thin layer of soft sandstone is met with 

 in the middle of the seam ; this sandstone thickens like a wedge 

 until the " Wash " is reached, the coal running out above and 



below, as shown in the section. The width of the " Wash " is here 

 about 34 yards ; and after heading this distance the coal was again 

 met with next the floor, at first a thin band, but gradually 

 increasing, until at 10 yards from the sides of the " Wash " it 

 reaches a height of 7 feet, — from this point returning to the ordinary 

 section of the seam. The edges of the coal next the " Wash " in 

 this section are dull and smooth, it being difficult in some jDlaces to 

 separate the sandstone from the coal, several thin layers of sandstone 

 and earth-like impurities running from the " Wash " into the 

 joints of the seam, and permeating the coal for a distance of from 2 

 to 8 feet. The " Wash " itself consists of a hard, yellow, stratified 



* In Quai-t. Journ. Geol. Soc. vol. xlvi., Proceedings, November (*>, 1889, 

 ]))). 1 and 2, a s^hort notice of this paper with the Discussion was ijublished. 

 Further particulars then asked lor huvnig been supphed, the present paper lias 

 been coniiuunicaled. 



