JEFFERSON COUNTY. 757 



In the hill above the shaft a quarry has been opened in a 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 foi- the Steubenville Coal and Mining Co., coal was reached at the 

 depth of 187i feet— 109 feet below the railroad. The coal is 4J feet in 

 thickness and of good quality. 



Fifty-four feet below the main seam is another coal 2J feet in thickness, 

 (Coal No. 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, 11 feet in diameter, and 5 feet high in the 

 clear, arched from 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 to Mr. Wm. Smurthwaite, mining 

 captain, we are indebted for much valuable assistance and information. 

 In the mine which now connects the " Stony Hollow " and JMarket 

 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. It 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 Yellow 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 0,72 



Fixed carbon 90.63 



Sulphur ,.-. .27 



Ash 8 38 



Total , 100.00 



