Bulletin of the United States Geological Survey--Corundum and Its Occurrence and Distribution in the United States (A Revised and Enlarged Edition of Bulletin ) . CORUNDUM IN UNITED STATES. 129 this vein continues as represented by the dotted line 3. Open cutson the east and Avest side of this block of gneiss have followed borderv^eins of corundum. PI. XVII, .1, gives a view of the peridotiteformation near the cut on the east side. Little Avork has been done atLaurel Creek except on border veins, the principal exception being asmall interior veni ((> in fig. 21) near the east end of t
Bulletin of the United States Geological Survey--Corundum and Its Occurrence and Distribution in the United States (A Revised and Enlarged Edition of Bulletin ) . CORUNDUM IN UNITED STATES. 129 this vein continues as represented by the dotted line 3. Open cutson the east and Avest side of this block of gneiss have followed borderv^eins of corundum. PI. XVII, .1, gives a view of the peridotiteformation near the cut on the east side. Little Avork has been done atLaurel Creek except on border veins, the principal exception being asmall interior veni ((> in fig. 21) near the east end of the formation,from Avhich considerable corundum Avas obtained, but the A^in soonbegan to pinch out. PI. XVII, B, gives a vicAv of this vein, shoAV-ing both the hanging and foot Avails of peridotite. At 5, fig. 21,. PERIOOTITEPAHTLY DUNITE Scale zoo 400 600 FEET COf^TOUR //^T£Rl/AL 20 r££T Fig. il.—Alap of the peridotite formation at Creelv, Kalnui County, Ga. considerable Avork has been done, and some large crystals, for Avliich:his mine is noted. Avere obtained here. This is perhaps the most famous corundum mine in this countiyind has furnished ore from Avhich an exceptionally good commercialproduct has been obtained. It has not been Avorked since 1891, Avhen the tunnels and shafts ofhe Big vein Avere cut off by the slipping of a large block of the)eridotite formation, nearly a 200-foot cube. It is that portion ofhe formation represented on the map (fig. 21) betAveen the open cut^1) and the cut to the AA^est of the block of gneiss (2).Bull. 269—06 M 9 130 CORUNDUM, ITS OCCURRENCE AND DISTRIBUTION. Track Roch mine.—The location of this mine is in the northeasterpart of Union County, Ga., on the south side of Track Rock GajThe corundum occurs in a peridotite formation, Avhich is
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