124 
CORUNDUM, ITS OCCURRENCE AND DISTRIBUTION. 
there is a series of about thirty outcrops of peridotite, which exten 
m a general northeast -southwest direction. All these outcrops ai 
small, and corundum has been found associated with many of then 
The location and relative size of the larger of these outcrops and th 
places where corundum has been mined are represented on the maj 
hg. 10. Most of this has been at the Bad Creek and Socrates mine 
but the greater part of the work done at any of them has been in th 
nature of prospecting. 
Burnt Rock niine. — At the Burnt Rock mine, which is locate 
about 5 miles northeast of Sapphire, all the mining has been dor 
Fk; 
. 19. — Map of the peridotite areas in the vicinity of Sapphire, Jackson County, 
showing the location of the different corundum mines. 
within the peridotite formation, and about 10,000 to 12,000 pour 
of corundum have been taken out. It is of good quality and occi 
in white crystals and knotty nodules. The ore is free from gari 
and can be readily cleaned. From the amount of work done h< 
the indications are that there is a considerable quantity of gc 
corundum associated with the peridotite near its contact with 1 
gneiss. The mining at the Brockton mine was also within 1 
peridotite, and about the same amount of corundum was taken ( 
as at the Burnt Rock mine. The corundum occurs in dull-gi 
