220 GEOLOGY OF OHIO. 
filling with water from the river. The coal is 5 feet thick, and but few 
acres have been so far taken. 
The shaft of the Jefferson Coal and Iron Company, commonly 
known as Bustard’s Shaft, is next in order. Quite a large amount of 
coal has been mined here, and the seam has the same thickness as above. 
What is known as the Gravel Pit Shaft lies next below. It holds 
a good 4 feet of coal, and has produced a considerable amount. 
The Stony Hollow Shaft of the Market Street mine has been 
abandoned, but not through any defect of the coal. In the adjoining 
mine of the same company, viz., the Steubenville Coal and Coke Com- 
pany, one of the best bodies of the Shaft coal has been found. Its 
entries extend through unbroken coal for more than a mile from the 
mouth of the shaft, and the seam holds its thickness of 4 feet with 
almost perfect uniformity, the only deviation being in the way of occa- 
sional increase. 
The mine of the Jefferson Iron Works, known as the Rolling-mill 
Shaft, exactly agrees with the property just described, against which it 
abuts. A large acreage has been removed from this mine also. 
Averick’s Shaft, now leased by the Ohio and Pennsylvania Coal 
Company, is next below. Its coal is of the same thickness, and is in 
no way inferior in quality. It has been worked largely, but not to the 
same extent as the mines last described. 
The next mine below is that commonly known as Boreland’s Shaft, 
but it is now operated by the Jefferson Iron Works, and is known as 
their Shaft No. 2. 
The coal is somewhat thinner in this mine, at least in its southern 
extension, than in the mines already reported. It comes down to 3 ft. 
6 in., and to 3 ft. 4 in., and on its southern boundary 4s disturbed by clay 
veins and other irregularities. The seam generally is remarkably free 
from troubles of this sort. This mine has produced a large amount of 
coal, as good in quality as any in the field. 
According to the best available testimony, not less than 1000 acres 
of coal have been worked out in the Steubenville mines. 
The “trouble” in the seam at the southern boundary of the last- 
named mine seems to extend into the territory of the Mingo Shaft, 
which adjoins it. Coincident with this fact, there is a serious diminu- 
tion in the volume of the coal, the measure running down to 30 inches 
and less, for most of the property which the entries have traversed.: 
