230 
GEOLOGY OF NORTH CAROLINA. 
also of another vein of hematite (specular, crystalline,) on the neighboring 
farm of Mr. Glass, which was revealed only by surface fragments; and 
also of “ a magnetic ore of fine quality on the plantation of T. Unthanks, 
2 or 3 mile& beyond the Evans place;” and another of the same class at 
Pleading’s, near Ore Hill. Another locality is noted by both Emmons 
and Wilkes as containing a bed of reddish-brown ore, which is magnetic. 
It is represented as 2p feet thick at the Tysor place, and as occurring at 
various other points. The analysis quoted by Wilkes from Emmons, 
gives, 
Peroxide of Iron, 79.72 
Carbon, 7.37 
Silica, 4.00 
Water, 8.80; containing 
Iron, 
61. 
But the most noted iron locality in Chatham county is known as Ore 
Hill. The accompanying plate shows the topography and general rela- 
tions, and (approximate^ 7 ) the situation of the veins, which are numerous 
and lie at various angles with the meridian and with the horizon. The 
rock is a talco-quartzose slate, knotted and toughened with much tremo- 
lite. The ore is limonite, with the exception of one vein near the top 
and back of the hill, which is a hematite, (in part specular), and much re- 
sembling the Evans ore. There is much of this ore on the surface in 
scattered fragments, indicating a vein of considerable extent, which, how- 
ever, had not been exposed. Most of the other veins have been opened, 
but the pits and tunnels were so much filled and fallen in that no accu- 
rate measurements could be taken at the time of my visit last year. But it 
was easy to see that two or three of them were very large, — 10, 15 feet 
and upwards. The ore is very spongy, porous, scoriaceous, botryoidal, 
mammillary, stalactitic, tabular, foliated, dendritic, and of many fantastic 
and nondescript forms. The workmen state that there are large cavities 
(vuggs) in some parts of the veins. 
