812 GEOLOGY OF OHIO. 
heavy, having a smooth surface and a waxy luster, but showing 
a cubical and not a conchoidal fracture. In color, it is dead, 
lacking the blackness of the ordinary seam. Its ash is dark-red, 
of so pronounced a color, that it has been ground with oil, and used 
for a paint. Its composition is indicated in the following analysis, by 
Professor Lord, of samples taken by Mr. Frederick Keffer, for the 
survey : 
Camp Creek “ Hard Coal”’. 
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It is used only for a grate fuel, and the composition shown above 
does not fit it for large service or popularity in this field. 
Whenever this double seam grows thinner as a whole, the lower 
or Massillon coal grows thicker. The coal connecting the two basins 
is entirely of the latter character. 
The roof of the hard coal is 4 to 18 inches of bony and worthless 
coal in the swamp, but near the edges of the basin the gray rock 
comes down directly upon the coal. The roof of the east basin is 6 
inches to 2 feet of black slate. Ina few places, this slate disappears, 
letting the sandstone down upon the coal. No complaint of bone is 
made in the cover of this coal. 
The floor of both basins is generally fire-clay, but in some cases, 
a flinty, gannister-like rock takes its place. 
The area already mined is estimated to be between 40 and 50 acres 
mainly in the east basin. This body is therefore near its limits. 
Exim Run MINE. 
Elm Run mine is located in Sections 3, 4 and 5, and holds by 
lease about 700 acres of land. Its coal is essentially continuous with 
Grove mine, No. 2, and with Camp Creek mine, last described. It is 
thought that a large acreage of coal will be found here, coming up 
almost to the proportions of the Willow Bank basin. The coal is of 
approved quality in all respects. It has full thickness, as far as de- 
