214 GEOLOGY OF OHIO. 
Diamond! Mine: alintome iiss dae bs eke eee esas chee eee nee see erie Lord 
Moisture! @..2705. 20. ee eee te Gi eros Veni dae, eee ane 1.67 
Volatilegmatteticciccck. sos Ae eh ool ok ace te ee ey eee 39.28 
I tab. 210 MGs: 1010) 0 Weer get r i en Ran UC eS oa 52.16 
oct 0 ERPS SRT rn sn RT A MSN RESTA. RRR Sa a aca 6.89 
NO Galle css cose Ee Mos eR ee 100.00 
SWlphur serch oseeesicastes solbccceoes coeeee ccsasees toec cee oteccume eee meee eene 3.43 
Strong heating power is indicated in the analysis, and realized in 
the consumption of the coal. The product of the mine is turned ex- 
clusively to railroad use, the Pittsburgh, Fort Wayne and Chicago 
Company taking the whole output. The coal is counted equal in 
strength to any with which it comes into competition. The “run of 
mine” is now taken by the railroad company, the coal being “ raked” 
in the rooms before being loaded into the small cars. So far as known, 
this mine is the only large mine in this portion of the State in which 
the rake is now employed. No troublesome clinker is reported in the 
burning of the coal. 
At Irondale the same seam has been worked to some extent in past 
years, but the mines are not now in operation. ‘There is no reason to 
doubt that work will sometime be resumed in this field, however, as 
there are valuable basins of coal known to exist here. The usual 
unsteadiness of the seam is experienced in the workings of this neighbor- 
hood, the seam passing from 6 to 3 feet with rapid alternations. 
The Brush Creek coal (No. 7 of Newberry) has a fine development 
throughout Jefferson county. It acquired the local name by which it 
is best known, viz., the Groff Vein, from the Groff farm, at the mouth 
of Yellow Creek. It has been worked there for many years, and the 
mine is still open. The seam is here 4 teet in thickness, the largest 
measure that it anywhere acquires. It holds this measure or at least 
nearly enough to be designated the “ 4-feet seam,” to the very western 
boundary of the county. The quality is everywhere excellent. It 
burns freely, leaving nothing but fine ashes. It is a favorite household 
fuel wherever it is accessible. 
There are numerous small mines in the seam along the valley, as 
at Elliottsville and Toronto, and elsewhere, but more important districts 
are found on Island Creek, where the coal is known as the Finley eoal, 
and on the upper waters of Yellow Creek, near Nebo, in Springfield 
township, where the coal is known as the Dorrance coal. The seam 
measures fully 3% feet in both regions, and is fairly steady and regular. 
The character of the Finley coal is shown in the following analysis : 
