THE LOWER COAL MEASURES. 199 
often found as a continuous bed. The clay which is taken up in main 
entries is utilized in potteries located in town. 
An ingenious automatic weigh-box has been contrived for the mine 
by the Superintendent, Mr. Laughlin. By means of it one man can 
weigh 1,000 tons a day without rising from his seat. 
The mine is one of the largest, and one of the most economically 
and successfully administered in the State. 
The Prospect mine of H.Suthern is worked in the same seam, and 
the coal is strictly continuous with that of the State Line mine. 
This field is near the northern outcrop of the Upper Freeport 
seam, but a vast body of coal stretches away to the south and southwest 
from here in a continuity, that is broken only by eroded drainage chan- 
nels and the occasional “ wants” of the seam. 
Continuous throughout this territory with the Upper Freeport 
seam, and with almost equal area, since the interval that separates it 
from the former is but 50 feet, the Brush Creek coal (No. 7 of New- 
berry in this district) is found in a seam of excelient character. It 
generally ranges in thickness from 2 ft. 4 in. to 2 ft.6in. It is an 
undivided seam when it does not exceed these limits. Sometimes it 
overruns them for a time, and in such case a thin parting generally is 
found near the bottom. It is the same seam that is worked at Saline- 
ville under the name of the Strip Vein, and at Linton under the name 
of the Groff Vein. It has been worked here quite largely on the 
Prospect property, but operations in it are now discontinued. It yields 
a superior milling coal, but the thinness of the seam works against its 
present success. The coal of this horizon is almost everywhere more 
highly esteemed than that of the Upper Freeport seam below it. Its 
structure is represented in the accompanying figure : 
FLGU RE AWM 
STRUGTURE OF BRUSH CREEK COAL 
(7 OF NEWBERRY) AT EAST PALESTINE 
Block Slaie_ 
