MAGNETITE IRON DEPOSITS OF SOUTHEASTERN NEW YORK _ 107 
the hill, which is overthrust to the northwest on the Hudson River 
slates, and which is bounded on the other three sides by Triassic 
block-faults. A vertical shaft of unknown depth, sunk in rock, is 
now drowned. In addition, the ore was apparently followed down 
the dip in places, but these openings likewise contain water and are 
of unknown depth. At the base of the hill on the east side a tunnel 
was at one time driven, possibly connecting with the shaft mentioned 
above. This is now caved and inaccessible. 
The mine was formerly operated by the Parrott Iron Company, 
but it has been idle since 1880. According to Putnam,™”° the mine 
was said to have been worked to a depth of 1000 feet, but this is 
doubtful. During 1880, 2579 tons of ore were mined, taken chiefly 
from an old pillar within 100 feet of the surface; even at that time 
the deeper part of the mine was full of water. Putnam gives the 
average analysis of a sample of ore taken from a pile of 100 tons as 
follows: 
DISRLO KAT ys Ses REN yt cap RST UN A Re 51.30 
I NOSPHORUSHe sea Gh ateA: EEO, TTL OU TI TT Ley 0.390 
SELDEN AS 8 O's iat eee s nN UL el Ae en 0.404 
it is estimated that the total production of the mine was 52,000 
tons. 
The walls of the cuts and openings are extremely variable, the 
variability being in large part due to injection and impregnation. 
The hanging wall in one of the smaller pits is badly shattered and 
crushed Pochuck-Grenville (see plate 8, figure 1) which exhibits 
deformation in a marked degree. In the same pit, and forming also 
part of the hanging wall, occurs a crushed and shattered syenitic 
facies of the Pochuck (see plate 8, figure 2), which is closely related 
to the ore in this mine, and which grades so imperceptibly into it 
that the ore seems to replace in part the invaded Pochuck-Grenville 
and in part its associated rock (see plate 10, figure 4). 
Connected with these rocks and forming also parts of the walls 
is coarse pinkish-gray Pochuck granite. 
The feature of special petrographic interest connected with this 
mine is the evidence of deformation, reflected in the thin sections 
and illustrated in plate 8. It is highly probable that the ore body 
itself is limited in extent and considerably affected by the same set 
of forces. 
The Clove mine. This old mine, which seems to have been aban- 
149 Putnam, B. T. Tenth Census Report, 1880. 
