136 
CORUNDUM, ITS OCCURRENCE AND DISTRIBUTION. 
east side was run 114 feet to the 
varies from a few feet to 10 or 12, 
vein. When this was reached a 
shaft and tunnels were start- 
ed. At this mine the corun- 
dum occurs in what might be 
caUed j^orphyritic crystals of 
a bronze color, which are from 
5 to 15 nnn. across. Here blue 
and white masses of corundum 
weighing several pounds have 
been found, and small, well- 
formed blue crystals are also 
frequent. A little north of 
this mine, in an old opening, 
a cross vein of chlorite was 
encountered which carried a 
great many almost perfect 
cubes of pyrite and radiating 
groups of black tourmaline. 
The last opening on the 
vein where there has been any 
work is at the Snow mine, 
over a mile north of the 
Sackett mine. A small open 
cut was made that exi)osed 
the vein, 3 feet in width. Be- 
tween these two mines and 
also from the Snow mine 
north to the river the vein 
can be followed almost con- 
tinuously. 
Although the vein can be 
followed nearly the whole dis- 
tance, the emery does not oc- 
cur throughout its entire 
length, for it is often in a 
series of pockets that are fre- 
(juently connected Avith each 
other along the strike by a 
thin streak of chlorite and 
have a general dip in the vein 
of about N. 80°. In the direc- 
tion of the dip, however, the 
emery is more or less continu- 
ous. The width of the vein 
with an average width for the 
