434 GEOLOGY OF OHIO. 
The ore is known only on the lands of Olive, Buckhorn, and Mt. 
Vernon furnaces. It is mainly worked by Olive Furnace, but Buck- 
horn is also mining a little. Itranges from 1 to 2 feet in thickness, and 
mines very small, being little better than dirt in appearance when it 
comes to the furnace. Care has to be exercised in charging it, on ac- 
count of this fine division, several serious accidents having already oc- 
cured in its use. The seam is steady and justifies mining on quite a 
large scale, both by heavy benching and by drifts. The mining of the 
ore 1s going forward continuously. 
Olive Furnace counts the ore essential, especially in the manufac- 
ture of car.wheel iron. A mixture of it with the other ores of its sup- 
ply is found to impart the chilling property required for this grade 
of iron. A considerable importance is thus seen to belong to this 
horizon. 
Fallelujuh Ore. 
The Hallelujah ore of Mt. Vernon Furnace lies, according to the 
best interpretations, a few feet above the blackband level, but upon this 
point there is room for difference of opinion. It may prove to be upon 
the blackband horizon, with the ore last named. Wherever it goes, 
will probably also go the Banda ore of Gallia Furnace, an ore once 
mined in considerable quantity, for a short time. Neither of these ores 
is distinctly stratified, and yet both agree with this class more nearly 
than with any other. 
The Hallelujak ore has large volume for a Hanging Rock ore, 
ranging from 1% to 2 feet in thickness. It is red on the outcrop, but 
under cover it is blue with a greenish tinge. Thus far it has been 
worked only in one hollow of Mt. Vernon land, but the same ridge that 
covers it reaches through to Buckhorn land, and it will probably be 
found here also when looked for. 
The ore imparts a peculiar character to the iron into the production 
of which it enters, causing it to crystalize in large plates, like spiegel- 
eisen. For some time this character of the iron worked agaihst it in 
market, but latterly a demand is said to have arisen, the nature of 
which is not now apparent. 
The last ore of the series scarcely deserves a place in the column. 
The Oak Ridge ore was discovered, it might almost be said, invented, | 
to meet the demands of a newly built furnace that was located outside 
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