Page:Report on the geology of the four counties, Union, Snyder, Mifflin and Juniata (IA reportongeologyo00dinv).pdf/323

Rh the depth below the outcrop at which the ore beds may be struck, but also largely upon the natural drainage of the bed itself.

Beneath the plane there were three additional drifts seen. One on the north bed followed the ore for 400 or 500 feet to a point beneath the large open cut driven first on hematite and eventually through the last 200′ on a carbonate iron ore bed. The two other drifts were lower down, driven half across the measures, the middle one getting the carbonate ore, but the lower one, near water level, finding nothing but black slate. There is another small bed reported to exist between the Marcellus limestone and the top of the Oriskany sandstone, but it has never been developed or well tested. Sufficient has been said, however, to demonstrate the persistency of this Marcellus ore bed wherever it is found to exist at all, and in addition to its being found here on both dips of the synclinal and of workable thickness it can be relied upon to furnish a carbonate ore with from 30 to 35 per cent of iron and about 18 to 20 per cent of siliceous matter; and a brown hematite where this bed is altered, which the Glamorgan Co., at Lewistown used for sometime, with an analysis of 42½ per cent. of iron and about 24 per cent. of insoluble residue. The carbonate ore contains always a considerable percentage of sulphur, but no analysis of the ore mined at the Ross bank has shown over 1 per cent. of sulphur, although this may vary considerably.

Mr. John Whitehead is the present lessee of this property, and, in mining for the Lucy furnace, about 10 tons a day of washed hematite was produced here. Mr. S. Treweek, superintendent at the ore mines, is authority for many of the facts given concerning this mines.

Dull & Bradley’s ore bank is situated in the third synclinal north of McVeytown on the property of Robert Clark, and was opened on the south dip of the Marcellus ore bed. The opening is located near the summit of the ridge which is largely sandstone and contains little more of No. VIll than the ore bed associated with its Marcellus limestone. The bed was found to be 3′ to 5′ in thickness