936 GEOLOGY OF OHIO. 
of this valley in which mining machinery has been employed. The 
Harrison machine was introduced here at the opening of the mine, but 
it was not retained very long. The working faces were wet in so many 
instances that the machines were at a disadvantage. 
Mine No. 7, known as the Baird mine, has by lease, 80 acres of the 
coal already described. No fault nor interruption has been found in 
its workings thus far, but it shows as regular a body of coal as is known 
in the valley. 
The three mines named above are the only ones of the Corning 
and Rendville district that have not suffered more or less from unex-_ 
pected and disastrous ‘ wants’’ in the coal. Mines, Nos. 9, 11, 13 and 
15 all came to trouble before their entries had been advanced 100 yards 
from the shaft. All of these but No. 13 are on the east side of Sunday 
Creek, and the explorations have been thorough enough to prove . 
that there is very little to be looked for on that side. No. 15 is 
already abandoned and filled with water. There is very little more 
than the lower bench that can be depended on here, and it cannot be 
mined under present conditions of market, although the coal is of excep- 
tionally good quality. About 34,000 cubic yards had been excavated 
when the mine was shut down, which stands for about the same number 
of tons of coal. Mine No. 11, located in Corning, was in the same 
condition, and would have been closed before this, had it not been for 
the recent purchase of the Rogers farm, which allows it to extend its 
working under the creek to the westward. By this means its life will 
be continued for 5 or 6 years. 
Mine No. 9 has coal to the northward and westward for 2 or 3 
years yet. On the east it has nothing. It met with failure of the coal 
before its workings were extended 100 feet from the shaft.. It has pro- 
duced thus far about 54,000 tons of coal. 
Mine No. 13 is located exactly on the boundary between the regular 
and the broken coal. All of its southward running entries were at 
once involved in the fault. Many attempts were made to find coal 
beyond, but it is now demonstrated that there is an extensive “ want” 
in that direction. To the west and north its coal is normal, and thus it 
has a large acreage still tributary to it. 
Whenever the coal fails, it is from one of two causes. Hither clay 
veins rise from the floor and interrupt its continuity, or the sandstone of 
the roof descends and takes the place of the seam, in part or entirely. 
