88 COKUNDUM IN THE UNITED STATES. [bull. 180. 
ALASKA. 1 
Copper River. — Asteriated corundum of gray and pink colors is said 
to occur in a locality on Copper River, Alaska. 
CORUNDUM LOCALITIES IN FOREIGN COUNTRIES. 
With the exception of the emery deposits of Turkey and the Gre- 
cian Archipelago there were no localities outside of the United States 
where corundum had been mined for abrasive purposes until during 
the last year or two, when work was begun at the India deposits. As 
preparations are being made to work both these and the Canadian 
deposits on a large scale, it has seemed to me that a short descrip- 
tion of them would be of interest and of value. I have also added a 
short description of the emery deposits of Turkey and the Grecian 
Archipelago. 
CANADA. 
The Canadian corundum localities that are attracting considerable 
attention at the present time are in the Province of Ontario, and have 
been recently described by Prof. W. G. Miller, 2 of the Kingston School 
of Mines. The corundum occurs as a primary constituent of a rock 
that is classified as a syenite and has been traced for over 50 miles 
across Renfrew, Hastings, and Haliburton counties, with smaller belts 
of the same rock in Peterborough, Lanark, and Frontenac counties to 
the south, making a total distance of nearty 100 miles in which the 
corundum-bearing rock has been found. 
The rock varies from a normal syenite to a nepheline-syenite and a 
mica-syenite. Corundum has been found in all three of these vari- 
ties, but is more abundant in the normal syenite, and this rock has 
been named corundum-syenite. These rocks, which occur as dikes 
cutting through the gneisses, are sometimes in large masses that 
appear to grade into a granite. The width of the dikes varies greatly, 
but is usually several feet ; a few have been observed that were only 
a few inches wide. These dikes are sometimes thickly studded with 
corundum crystals. Assays made of this rock from various parts of 
the dikes indicate that it will average about 12 per cent of corundum. 
If the corundum can be mined economically, and if tests of the com- 
mercial corundum obtained from the ore show that it has the abrasive 
qualities essential to make it of use in the manufacture of vitrified 
wheels, these deposits should become of considerable importance. 
The Canada Corundum Company, Limited, has been organized and 
has begun mining operations on the corundum deposits in the ex- 
treme northwestern part of Raglan Township, Renfrew County, 
Ontario, about 7 miles southwest of Combermere. The corundum 
1 Twentieth Ann. Rept. U. S. Geol. Survey, Part VI, 1809, p. 570. 
* Report Bureau of Mines, Toronto, Can., Vol. VIII, Part II, 1899, pp. 205-240. 
