TEW: EXTENSION OF MINING OPEEATIONS. 101 
Fan of 13 feet diameter is in course of construction to be driven 
by a pair of eng"ines of 26 inch cylinders with a nominal power of 
70 horses each. The capacity of the fan will be equal to about 
250,000 cubic feet of air per minute. 
This immense undertaking will involve an outlay of about 
£130,000. At Wheldale, the Barn.sley bed is 202| yards below the 
ground surface ; at Merefield Colliery, 254 yards ; at South Kirkby , 
634 yards ; and at Denaby Main, near Conisbro', this splendid bed 
is successfully worked at a depth of 449J yards. 
Lastly, let me mention the probable extension of the York- 
shire coal field beneath the Magnesian Limestone and the New Red 
Sandstone, on the north side of the river Aire, and on the line of 
the Hull and Barnsley Railway, near Snaith, by Lord Beaumont 
of Carleton Towers. 
A bore hole has been put down under the direction of Mr. 
Cfreaves, about 11 miles eastward of the Fryston Colliery, and two 
miles from Snaith, at West Bank, to a depth of 400 yards v^-iih 
the following results, viz : — 
Earth, warp, and clay ... ... ... ... 15 yards. 
New Red Sandstone ... .. ... ... 180 „ 
Upper Permian Marls ... ... ... > 
Red Marls with beds of Gypsum ... ... > '' 
Upper Permian Limestone ... ... ) .^^ 
Limestone with some bands of Gj'pimn ... ) ' 
Middle Permian Marls ... ... ... ^ 
Red Marl with thin bands of Limestone and - 41 „ 
Gypsum ... .. ... .. ) 
Lower Permian Limestone... ... ,.. G8 „ 
Coal Measures, Sandstone, Blue Shale, Black-\ 
Shale, Coal, 1 foot 6 inches, Spavin andv 45 „ 
Blue Shale ) 
Total, 400 yards. 
Unfortunately, the boring stops short without reaching the 
Barnsley bed, which is believed to be a little lower down, because 
the contract for boring was only for this depth of 400 yards. 
Mr. Greaves allows me to show a specimen of the Gypsum, 
