pkatt.] CORUNDUM IN GEORGIA. 65 
a little work was done farther to the east which showed the corundum 
vein to extend on the south side of the block of gneiss, and it is not 
at all improbable that this vein continues as represented by the dotted 
line 3. Open cuts on the east and west side of this block of gneiss 
have followed contact veins of corundum. PI. XIII, A, is a pho- 
tograph of the peridotite formation near the cut on the east side. 
Little work has been done at Laurel Creek except on contact veins, 
the principal exception being a small dunite vein (<> in fig. 12) near 
the west end of the formation, from which considerable corundum 
was obtained, but the vein soon began to pinch out. PL XIII, B, is 
a photograph of this vein, showing bol h t he hanging and foot walls of 
peridotite. At 5, fig. L2, considerable work has been done, and some 
Large crystals, for which this mine is noted, were obtained here. 
This is perhaps t he most famous corundum mine in this country, 
and lias furnished ore from which an exceptionally good commercial 
product has been obtained. 
It has not been worked sinee L894, when the tunnels and shafts 
of the Big vein were mil off by the slipping of a large block of the 
peridotite formation, nearly a 200-foot cube. It is that portion of the 
formation represented on the map (fig. L2) between the open cut (1) 
and the cut to the west of the block of gneiss (2). 
Track l\<><-l> mine. The location of this mine is in the northeastern 
part of Union County, Ga., on the south side of Track Rock Gap. 
The corundum occurs in a peridotite formation, which is very much 
decomposed on the surface, there being very little visible but, a mass 
of chlorite-schisl containing more or less actinolite. A tunnel, hav- 
ing its upper end 75 feet below the surface, has been run in on the 
formation for about 200 feet, with short branching tunnels at several 
points. From the material cut through by the tunnel, which was 
examined by King, 1 of the Georgia geological survey, the rock was 
found to bean altered peridotite, made up of small grains of chrysolite 
surrounded by actinolite, and containing many grains of magnetite. 
It may be that the original of this rock was the peridotite amphibole- 
picrite. 
All the work that has been done at this mine has been entirety within 
the formation, and the best results would be obtained near the con- 
tact of this rock with the surrounding country rock. 
Foster mine. — This mine, which is located in the northeastern part 
of Towns County, Ga., just over the North Carolina line, has been 
described with the other mines occurring in this vicinity under the 
head of "Corundum in North Carolina," on page GO. The corundum 
occurs in a quartz-schist, and the property is owned by the Corundum 
Mining and Manufacturing Company, of Philadelphia, Pa. 
1 Bull. Geol. Survey Georgia No. 2, 1894, p. 93. 
Bull. 180—01 5 
