30 NEW YORK STATE MUSEUM 
The active mines in the Adirondacks are situated in Essex and 
Warren counties. The North River Garnet Co., with mines and mill 
on Thirteenth lake, Warren county, southwest of North River, is 
the principal producer and carries on operations more or less con- 
tinuously throughout the year. The garnet occurs in disseminated 
crystals in a hard, gneissoid hornblende — feldspar rock which has 
to be crushed and subjected to mechanical separation to recover 
the mineral, the separation being complicated by the slight differ- 
ence in the gravity of the garnet and hornblende. The separation 
is effected mainly by jigs of special design and results in a very 
clean concentrate, with such variation of sizes as 1s required for 
abrasive purposes. The deposit, situated on the side of a mountain, 
is attacked by open-cut quarry methods which by reason of its large 
size and convenient position admit of great economy in breaking 
and transporting the rock. 
The next most important source of garnet is on Gore mountain, 
a little west and south of North Creek, and some 4 or 5 miles 
southeast of the former deposit. The garnet here occurs in a band 
of dark hornblende gneiss, forming larger crystals than are found 
anywhere else in the Adirondacks. They measure a foot or even 
more in maximum diameter. The band of garnet gneiss is relatively 
narrow and is worked in open pits. The rock is broken down by 
sledges and the garnet, which has been shattered by regional com- 
pression, is readily picked out of the matrix by hand. These quar- 
ries are worked only in the open season. They are operated by 
H. H. Barton & Son Co. of Philadelphia. 
Some production has been made from time to time from Garnet 
peak, in the town of Minerva, Essex county, about 3 miles from 
North River, on the Indian Lake road. The garnet is in small 
srystals, but plentifully distributed through the rock. In years past 
the American Glue Co. has been active at this locality, but made 
no output in 1912. Rel 
The Warren County Garnet Mills, Inc., of Riparius, have recently 
been active at a locality near Wevertown, south of North Creek. 
The mineral here is quite different in appearance from that pro- 
duced in the other mines of this section, being partly granular or 
compact, rather pale in color, and lacking the tendency to break 
with smooth surfaces which is characteristic of the crystal garnet. 
It is also more or less intergrown with a green pyroxene. The 
material is hand-sorted and prepared for market by grinding to 
proper size. . 
