hayes and eckel,] IRON ORES OF CARTERSVILLE DISTRICT, GA. 241 
deposits associated with faults and formed in fissures are undoubtedly 
the deepest of all. If, as appears probable, they were formed b} T solu- 
tions ascending from considerable depths, they may extend downward 
several hundred feet, although the character of the ore would doubt- 
less be found to undergo some change with depth, the oxide being 
accompanied by increasing proportions of sulphide and perhaps 
carbonate. 
The general belief among the ore miners that certain of these brown 
hematite deposits are stratified, occupjang a definite geologic horizon, 
is, of course, entirely erroneous. Also, the view which has been 
held a that in this and adjoining districts the deposits of brown hema- 
tite follow the outcrops of particular beds rich in iron is almost equally 
erroneous. The present distribution of these deposits, as shown above, 
depends entirely upon the geologic structure which determined chem- 
ical and physical conditions requisite for their deposition. In all cases 
the iron has been transported to a greater or less distance from the 
beds in which it was originally disseminated. The specular hematite 
above described, and the red hematites which occur at various hori- 
zons in the Silurian rocks, belong to an entirely different class of 
deposits. 
The deposits of brown hematite which are at present best exposed, 
and which furnish excellent examples of the type of "concentration 
deposits" described above, are those now worked by the Hurt Iron 
Company at Sugar Hill. The mines are located about 12 miles north- 
east of Cartersville, and 3 miles southeast from Pine Log Village. 
Supplies are obtained and ore is shipped over a branch road which 
leaves the Western and Atlantic tracks at a point about 3 miles west 
of Cartersville. 
Occurrence of ores. — Mining is being carried on in a number of 
large open cuts, which, with natural exposures in the vicinit} 7 , permit 
a good idea of the structural relations of the deposits to be obtained. 
The ore deposits are associated at this point with the upper beds of 
the Weisner quartzite (Cambrian). In the vicinity of the mines, the 
quartzite beds are seen to lie in a series of low folds, cross folded so 
as to form a number of shallow pitching basins. The ore deposits 
occur as a mantle over the impervious quartzite strata, and are 
in turn often overlain by thin beds of talcose slates, which are com- 
monly much decomposed. Taking the Sugar Hill group of mines 
as a whole, their ore deposits seem to occupy a fairly regular strati- 
graphic position. They appear to have originated by a replacement 
of the strata which originally lay between the quartzite and the talcose 
slates, by the deposition of iron from surface or underground waters. 
a Spencer, J. W., Economic resources of the Paleozoic group of Georgia: Geol. Survey of 
Georgia, 1893. 
Bull. 213—03 16 
