126 THE GOLD DEPOSITS OF DAHLONEGA, GA. 
likewise have suffered corrugation and bending. This is probably the southerly continua- 
tion of the Benning contact zone. The schist contains stringer zones of quartz veinlets 
trending northeastward, and some of these zones are now mined in the tunnels just back 
of the mill. 
STANDARD MINES. 
On the east side of Yahoola River and about a quarter of a mile northeast of the Con- 
solidated mines are the Standard mines. They consist of a series of quartz lenses known 
as the Weaver, Campbell, Thaloneka, and Rosamund veins. The developments are con- 
fined to tunnels and small underhand stopes. From the Rosamund vein good ore was 
extracted at the time of visit and milled in the Standard mill with 20 stamps. Very rich 
pockets are occasionally found. 
The country rock is a rather coarse mica schist which close to the veins appears to con- 
tain a little more muscovite than elsewhere. It is a normal biotite-quartz schist with a 
small amount of magnetite, albite, and muscovite, but contains no garnet or tourmaline. 
A little pyrite, pyrrhotite, and chalcopyrite are present in intergrown aggregates and 
probably are derived from the vein solutions. The schistosity strikes N. 12° to 25° E., 
the dip being 35° ESE. The quartz of the veins is compact, almost glassy, and contains 
irregularly distributed pyrite, chalcopyrite, zinc blende, and in some cases galena, besides 
free gold, partly intergrown with quartz, partly with sulphides. At the time of visit a stope 
25 feet long was carried down below the tunnel level on the Rosamund and extracted 7 
feet wide. No values are here contained in the schist adjoining the quartz. The manager, 
Mr. George Bryman, states that the ore contains $20 per ton in gold; the sulphides contain 
$25 per ton and are thus comparatively poor. 
LOCKHART MINE. 
Along Yahoola River from the Standard to the Lockhart mine, amphibolites prevail 
with north-northeast or east-northeast strike and variable dip. Near the Lockhart mine 
mica schist begins, and at a fresh exposure on the river bank was noted a small lenticular 
vein of quartz containing a few garnets. The same mineral was also contained in the 
immediately adjoining schist. This stringer probably belongs to the Lockhart zone. 
The Lockhart mine has been worked successfully for many years, but on a small scale. 
A large surface cut is situated on the west side of the river, and recently a shaft 60 feet deep 
has been sunk near the stream and tunnels run in a westerly direction to intersect the 
veins. The veins lie in a belt of normal mica schists like those described on page 120, 
dipping about 40° E. or NE. and very near to a mass of amphibolite which conformably 
underlies these schists. The ore occurs in shoots, locally called "arms," which consist of 
a series of lenticular quartz masses in dark-gray or black mica schist, but very close to 
the contact of the underlying amphibolite. The veins, like the schists, dip 30° to 40° NE. 
In the large cut the rocks are much decomposed and the shaft was inaccessible on account 
of water, but excellent exposures were seen in a small tunnel or cut about 200 feet southwest 
of the shaft. 
As shown in fig. 16, the vein is here 7 feet wide, dips 34° NE., and consists of a number 
of quartz stringers more or less lenticular in shape and separated and adjoined by streaks 
of a very coarse-grained rock, which consists chief!}' of garnet, dark-green mica, and horn- 
blende, and which evidently represents the country rock deeply altered by the same solu- 
tions as deposited the quartz. Beyond the walls indicated in fig. 16 the rock is the normal 
mica schist, though the amphibolite lies a short distance in the foot. PI. IX represents 
in natural size a cut and polished specimen from the vein, which well illustrates the char- 
acteristic structure. The garnets are indicated in the dark central and upper portions by 
the light rims of remaining polishing powder. Most of the remaining dark portion is a 
dark-green, almost black mica, which also in places projects its foils into the white quartz. 
Little specks of pyrite are contained in the dark pari, while none, show in the quartz. 
Sulphides, however, occur in the quartz and consist of pyrite, pyrrhotite, chalcopyrite, 
