ECONOMICAL GEOLOGY. 
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on the east side of Haw River and about 2 miles distant, at the foot of 
Tyrrell’s Mountain on the farm of Mr. Snipes. The vein has not been 
fully exposed, but is reported to be 3 or 4 feet. It is in syenyte, and has 
an epidotic gangue. 
The analysis (made by Lobdell) is as follows : 
Silica, 1.62 
Alumina, 6.60 
Magnetic Oxide of Iron, 88.41 
Manganese, 0.56 
Lime, trace 
Magnesia, 0.85 
Pho-phoric Acid, 0.00 
Sulphur, 0.13 
Metallic Iron, 63.49 
A very fine micaceous hematite is found near the month of Collins’ 
Creek a few miles above, in Orange county. It has not been explored, 
but surface fragments are reported to be abundant. 
But the most notable ore bank yet opened in this county, is that at 
Chapel Hill. It is a very dense, steel-gray, hematite, (specular in part), 
with slight magnetic indications. The accompanying diagram shows its 
relations. The vein is found on a hill one mile north from Chapel Hill, 
and more than 200 feet above the creek at its base. The rock is a gray 
granite and syenyte, but the vein is carried by a much-jointed, fine 
grained, ferruginous, slaty quartzite of several rods breadth, the iron- 
bearing portion of it, the vein proper, being 7 to 10 feet at the main shaft, 
and suddenly enlarging near the summit of the hill, just beyond the 
second shaft, to 25 and 30 feet. The hill top is covered with angular 
fragmentsof the ore of all sizes, up to more than 100 pounds weight. 
