No. 275.J 
109 
soiae depthj only a few small stripes of ore penetrate through the super- 
incumbent mass to the surface, as if the rocks had been cracked asun- 
der, and these small seams of ore had been forced up from the main mass 
below. The beds or veins of magnetic iron ore lie either vertical, or 
dipping to the ESE, at an angle corresponding nearly to the dip of the 
strata. One example, only, was observed where its dip was to the 
WNW, viz: at the Stewart mine. The ore is very variable in quality. 
In some it is nearly pure magnetic oxide of iron- in others it is inter- 
mixed more or less with the materials of the contiguous rocks; in oth- 
ers, it is mingled with pyrites and with other minerals. Two main veins 
of this ore will be described under the names of the Philips vein and the 
Simewoo- vein. Numerous localities are known where this ore occurs, 
and where it has been dug in small quantities. They will be mention- 
ed under the head of local details. 
LOCAL DETAILS. 
A bed of magnetic oxide of iron has been opened on Break-neck moun- 
tain, and several tons taken from it. The extent of the bed is not 
known, and the ore has not, it is believed, been smelted. 
Another bed has been opened on the northeast part of Constitution 
Island, opposite the West-Point foundry. 
Another was opened in the middle of the island. The ore occurs, 
disseminated in granite near the redoubt, above the Target rock on 
Constitution Island. Magnetic oxide of iron is thickly desseminated in 
limestone, near Philips' mill, one and a fourth miles east of West-Point; 
and it is found in that stratum of limestone in many places, from the 
above locality to near half a mile south of the " Cotton Rock," a dis- 
tance of three miles. 
It also occurs in the granite rock that is associated w-ith the augite 
and limestone rocks near the old " silver mine"* three quarters of a 
mile southeast of Consook Island, and one mile northeast of Anthony's 
Nose mountain. 
A bed was opened many years ago on Anthony's Nose mountain, 
but it contained much pyrites and crystallized phosphate of lime, both 
of which injure the ore for the manufacture of iron. 
* This mine was opened in ancient times, for what purpose is not known. Stalactites are 
found in the adit level, which is 200 yards long, and old tools with the handles rotted out 
have been found in it. It was reopened some years ago with the hope of getting silver — the 
man who worked it having been told that the scales of plumbago in the rock were sulphuret of 
silver. He is said to have spent all his property, and to have died in a mad-house. 
