128 THE GOLD DEPOSITS OF DAHLONEGA, GA. 
quartz, with a little calcite or dolomitic carbonates, pyrite, pyrrhotite, chalcopyrite, and 
magnetite. The sulphides in places give a banded appearance, to the quartz. 
Neither schist nor granite is noticeably altered along the vein. Biotite, albite, and 
orthoclase from the wall rock adjoin the quartz without change. 
JUMBO MINE. 
The Jumbo property is situated 6 miles northeast of Dahlonega, near the Garnet mine 
and on Ca vender Creek, which has proved auriferous up to these mines. The developments 
consist of several tunnels and a 60-foot shaft. The country rock is a dark brownish-gray 
mica schist, with curved surfaces of schistosity ; it is similar to the schists already descriled, 
but contains very little black iron ore; instead, small anhedrons of pyrrhotite are present. 
The surface rocks are very soft and decomposed to a depth of about 50 feet. Granite 
is said to outcrop a short distance away from the mine. Over a width of several hundred 
feet the schists, which strike N. 20° E. and dip steeply to the northwest, contain a great 
number of chiefly conformable quartz stringers and several good-sized quartz veins with 
some pyrite. Within this zone are several narrower belts from a few feet up to 50 feet 
in width, in which the gold values are especially concentrated. The gold has a crystalline 
appearance and is very fine grained. 
Specimens of the ore from the shaft show that it consists of a bleached schist with more 
or less lenticular quartz veins having an allotriomorphic structure and containing sharply 
defined cubes of pyrite. The schist adjoining the veins is bleached by abundant develop- 
ment of sericite; it contains no garnets nor biotite, but some chlorite and many micro- 
scopic crystals of rutile. It is proposed to mine the decomposed surface rock at this mine 
by hydraulic methods. 
