File:Bulletin of the United States Geological Survey-Corundum and Its Occurrence and Distribution in the United States (A Revised and Enlarged Edition of Bulletin No.180) (1906) (14595590609).jpg

Identifier: bulletinofunited269prat (find matches)
Title: Bulletin of the United States Geological Survey--Corundum and Its Occurrence and Distribution in the United States (A Revised and Enlarged Edition of Bulletin No.180)
Year: 1906 (1900s)
Authors: Pratt, Joseph Hyde
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Contributing Library: Clemson University Libraries
Digitizing Sponsor: LYRASIS Members and Sloan Foundation

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e cut (1, fig. 21) for a distance of over 300 feetrepresented by the dotted lines, with the shaft house (4, fig. 21) nea:the western end. iVlthough this vein is near the contact of the perldotite with the gneiss, it is separated from it by a band of peridotitand a small vein of sand corundum. There is some doubt whether th(block of gneiss (2, fig. 21) is entirely surrounded by the peridotitor Avhether it penetrates the peridotite from the main mass of gneisj^From what could be seen, and from information obtained from MiA. Evans, foreman of the mine, it has very much the appearance obeing entirely inclosed in the mass of peridotite. The Big veinAvhich has been worked by an inclined shaft 116 feet deep, with tunjiiels 300 feet in length, has brought the work up to the block of gneidjust referred to, and, according to Mr. Evans, a little work was doniifarther to the east which showed the corundum vein to extend on thisouth side of the block of gneiss, and it is not at all improbable thaj
Text Appearing After Image:
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,

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