236 
GEOLOGY OF NORTH CAROLINA. 
ore is of good quality, as will he seen by the following analysis by Dr. 
Gen th : 
27 
Silica, 20.38 
Magnetic Oxide of Iron, 75.69 
Magnesia, 1.26 
Phosphoric Acid, 0.05 
Water, &c., 2.62; which gives 
Metallic Iron, .. 5-1.81 
An analysis of another sample (by a different chemist), gave iron 56.50. 
Hand specimens of very line magnetite and specular ore have been 
brought to the Museum from many other parts of Orange county, but no 
information has been received as to their quantity. 
At Mt. Tirzah, in the southeast corner of Person, near the Orange line, 
there is a vein of hematite, (specular) from which ir on was made to some 
extent during the war. The vein is described as about 6 feet thick. The 
specimen sent to the Museum indicates a very line ore, resembling that 
at Buckhorn. 
The ores of Montgomery and Randolph belong proper]} 7 (geologically) 
to the Chatham range ; they are found in the same great slate belt, (Hu- 
ronian), that constitutes the most notable feature of the middle region of 
the state, both geologically and mineralogically. The best known of these 
ores is found near Franklinville, Randolph county. And another vein 
has been opened near Ashboro, both of specular hematite. Some of the 
strongest and most highly prized iron obtained during the war came from 
this locality. It was all devoted to the manufacture of shafts and other 
machinery for the Steam Rams (iron-clads) and the like. Dr. Emmons 
describes an occurrence of hematite of apparently considerable extent 7 
miles southwest of Troy, in Montgomery county ; he says it is free from 
sulphur and a very pure ore. Another occurrence of ore,— magnetite, is 
noted by him 4 miles north of Troy. It is found with talcose slate, and 
is soft and friable, and contains seams of hematite. 
Iron Ores of Guilford County. One of the most remarkable and per- 
sistent ranges of iron ore in the state crosses the county of Guilford in a 
northeast and southwest direction, passing about 10 miles northwest of 
Greensboro, near Friendship. It extends from the head waters of Ab- 
bott’s Creek, in Davidson county, entirely across Guilford to Haw River, 
in Rockingham, a distance of some 30 miles, making its appearance on 
nearly every plantation, and indeed almost every hillside in the range. 
