JEFFERSON COUNTY. 157 
In the hill above the shaft a quarry has been opened ina stratum 32 
feet in thickness of a light colored sandstone. This is of excellent 
quality and has been largely worked. In the “Stony Hollow” Shaft 
sunk for the Steubenville Coal and Mining Co., coal was reached at the 
depth of 1875 feet—109 feet below the railroad. The coal is 43 feet in 
thickness and of good quality. | 
Fifty-four feet below the main seam is another coal 24 feet in thickness, 
(Coal Ne. 5). The Market Street Shaft of the Steubenville Coal and Min- 
ing Co., is 225 feet deep, and the coal lies 23 feet lower than in the 
“Stony Hollow” Shaft. It is here*4 feet to 4 feet 8 inches in thick- 
ness, with a parting 14 inches above the bottom. The roof is gray slate, 
and it is underlain by fire-clay said to be 9 feet in thickness, but con- 
taining much iron and of inferior quality. At the time the survey was 
made sixty miners were employed by the Steubenville Coal and Mining 
Co.; a considerable portion of the product of the mine was coked, though 
the greater part was sold in the city or to the railroad company ; some 
of it was also shipped for use in rolling mills and gas works, The coke 
ovens used here are circular, 1] feet in diameter, and 5 feet high in the 
clear, arched frem the bottom ; the charge is 100 bushels of coal, and it 
is left in the oven 72 hours. To Mr. Jas. Blynn, former superintendent 
of all the works of the company, and te Mr. Wm. Smurthwaite, mining 
captain, we are indebted for much valuable assistance and information. 
in the mine which now connects the “Stony Hollow” and Market 
Street Shaft a thin coal is seen above the main seam. In the “Stony 
Hollow ” Shaft it lies near to the main coal, and in the workings of the 
mine it has been found in contact and blending with it; going towards 
the Market Street Shaft, the seams diverge until they are 18 feet apart. 
In this mine a coal seam 4 feet thick has been found 44 feet below the 
main coal. Jt is probably the same as that found next below the main 
coal in the Wills Creek boring, and “Stony Hollow” shaft and the 
equivalent of the “Roger Vein” of the Yeliow Creek Valley. 
The shaft of the Steubenville Furnace & Iron Co., known as the Gravel 
Shaft, is 92 feet deep; the coal is 3 feet 10 inches thick, and of 
superior quality. It is coked for use in the new furnace of the company, 
and an analysis of the coke, made by Otto Wirth, of Pittsburgh, gave 
the following for its composition : 
Water and hydrogen..-.... pat rere ay Naver LA Re oa. Mec Ie suite hes ee Ne ot 0.72 
PIXeGUCAT VOM! coined sess oe aloe Pee hare de teachin alls Maa lun ata boon » SUG 
Sulphurecssse Joes Si ors ELSES A a I Aen gs Beers ne Si 
INN, GSACBO GESSSO SE OO AL CE eS re ARS EE SA a 8.38 
IO La eeeevapee eran a nea iabamiezers Mien Gee se ok eek ace 100.00 
