No. 275. J 113 
lands. The ore seems to have been injected among the rocks. In some 
places it forms regular stripes on the surface of the rock, parallel to the 
line of bearing, in others, there are scarcely any indications on the sur- 
face, while extensive masses exist a short distance below. This cap of 
rock over the ore is frequently called by the miners a rider, and the ore 
below, the horse. The mine now at work north of the house, is about 
30 feet deep, and the vein of solid ore 25 feet wide, overlaid by a cap 
or rider of rock which contains but little ore. 
Most of the ore is very compact and pure, but some contains horn- 
blende. Much of the feldspathic rock contiguous to the vein is inject- 
ed with thin veins of ore from one-eighth to one inch thick. 200 yards 
SSW is another opening from which much ore has been taken. This 
place has been excavated to a depth of 60 feet, and the vein is 20 to 30 
feet wide. 20,000 to 30,000 tons of ore at least have been removed. 
Contiguous to this opening is another 30 feet deep to the water, with 
a sheet of rock 5 or 6 feet thick, between two divisions of the vein. 
The rocks on each side of the vein are more or less injected with thin 
veins of ore; from examining the locality, many suppose that the ore 
has been injected into the cracks and crevices of the rock when broken 
up by some upheave. 
This ore is delivered at the Cold Spring furnace, and at the wharf at 
Cold Spring, for $3 per ton, and mined as it is, scarcely any profit can 
be realized at this price. The quantity mined here is 600 tons per an- 
num. 
The Coal Grove mine is about one or one and a half miles SSW of 
the Denney mine. It is in gneiss. The vein is narrow at the surface, 
but at the depth of 12 feet it is 4 feet wide. The ore is of an ex- 
cellent quality, very rich, and well adapted for the forge, and will, un- 
doubtedly, make an excellent iron. The distance from this mine to the 
furnace and Cold Spring landing, is less than from the other mines.* 
The Gouverneur mine is about one and a half miles SSW of the Coal 
Grove mine, and four miles east of the Philips manor house, at the 
southeast corner of the water lot. The ore is much intermixed in the 
rock, but would perhaps work well, mixed with other ores to flux out 
the feldspar and other minerals. It may probably be purer farther down. 
It has been opened in several places along the crest of the mountain to 
a depth from 3 to 12 feet. 
* The Kemble mine is a short distance NNE of the Coal Grove mine, and on Philips' vein. 
[Assem. No. 275.] 15 
