ECONOMICAL GEOLOGY. 
259 
This range of ore-beds extends southward across the South Fork of 
Yadkin River into Davie county, where the ore still preserves the same 
characteristics as in the above mentioned counties, but of the extent of 
the beds and their distribution, I have no definite information. 
The northern or Stokes group of the range lies on the east, (north) side of 
Dan River, and within 2 and 3 miles of Danbury. These are collected for 
the most part in a group of parallel beds, in a dark to black and greenish- 
black micaceous and hornblendic gneiss, the beds being very well defined, 
and the ore concentrated in certain definite strata, and in the case of the 
Rogers Ore Bank, it is aggregated into considerable masses of pure gran- 
ular ore, of very coarse grain. This bed is 8 feet thick and has been 
worked on a considerable scale ; and an excellent iron was smelted in the 
furnace at Danbury during the war. Another bed reported to be 10 feet 
thick has been opened about half a mile east of the last, and two beds, (one 
■of them 4 feet thick, the other not opened), have been discovered at different 
times within 300 and 600 yards of it, on the west. The ores are all mag- 
netites, with sometimes a small admixture of hematite. The following- 
.analyses are by Dr. Genth : 
59 
60 
61 
62 
Oxides of Iron, 
.... 92.47 
85.09 
79.71 
67.66 
Oxide of Manganese, 
.... trace 
trace 
trace 
trace 
Alumina, 
0.70 
2.27 
0.17 
Magnesia, . 
0.20 
0.16 
0.17 
0.23 
Lime, 
.... 0.13 
0.29 
0.31 
0.19 
Phosphoric Acid, 
0.00 
0.00 
0.00 
0.00 
Actinolite, &c., 
7.20 
13.76 
15.66 
31.75 
Water, . 
1.88 
Metallic Iron, 
65.34 
61.74 
57.13 
49.03 
The purity of these ores is conspicuous. Phosphorus is wholly want" 
ing. Some samples contain a small percentage of pyrites. Manganese 
appears as only a trace in the analyses, but it must exist in larger propor- 
tions in some parts of the bed, as spiegeleisen is occasionally an accidental 
product. The above specimens of ore are all from the Rogers Ore Bank. 
There is also a small outcrop of limonite in the vicinity of the Rogers 
bed, of which Dr. Genth’s analyses gives the peroxide as 31.36 per cent.; 
phosphoric acid 0.44. There are other outcrops of magnetic ere' in the 
county, a notable one on the south side of the Sauratown Mountains, 
among the head waters of Town Fork of Dan River. It is evident that 
