Bulletin of the United States Geological Survey--Corundum and Its Occurrence and Distribution in the United States (A Revised and Enlarged Edition of Bulletin ) . t trend, which vary in width from 15 to 75 feet. The miner-alogical com])osition of the rock shoAvs that it has a close affinity withminette and shonkinite, as described on page 47. lee c Weed, W. H., Twentietli Ami. Kept. I. S. (Jeol. Survey, pi. .!. tS9!), pp. 4r>4-400. 112 CORUNDUM^ ITS OCCURRENCE AND DISTRIBUTION. The alluvial deposits beloAv these dikes have been pretty thoroughlyworked for the sapphires, and mining ope

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Bulletin of the United States Geological Survey--Corundum and Its Occurrence and Distribution in the United States (A Revised and Enlarged Edition of Bulletin ) . t trend, which vary in width from 15 to 75 feet. The miner-alogical com])osition of the rock shoAvs that it has a close affinity withminette and shonkinite, as described on page 47. lee c Weed, W. H., Twentietli Ami. Kept. I. S. (Jeol. Survey, pi. .!. tS9!), pp. 4r>4-400. 112 CORUNDUM^ ITS OCCURRENCE AND DISTRIBUTION. The alluvial deposits beloAv these dikes have been pretty thoroughlyworked for the sapphires, and mining operations are now confined N. ,^-^?-^^^=»^ ^ Pi ^^?^V^ ^^^ ^^ o* ji ^\ \\ S A ^^^ 1 ^ 1 °o ^^^ ^^! :)iil\vVM>-^^^y ^ <o _^i \/^ ^ ^ /v/ ^^^ ^ if c^ fo ;? •o «o 1 •v <M O Ui o (fc- 5: <^ k- ^^ 5 ^ <o ^ Aj (Vj •^ iilmost entirely to the dikes themselves. These dikes, the npper portion of which is thoroughly decomposed, have been worked by mean: U. S. GEOLOGICAL SURVE BULLETIN NO. 269.

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