MAGNETITE IRON DEPOSITS OF SOUTHEASTERN NEW YORK Q7 
THE GREENWOOD GROUP 
This group includes the Hogencamp, Surebridge, Pineswamp, 
Greenwood, Cunningham, Bradley and Alice mines. They lie about 
5 miles north of old Greenwood furnace, and north of Arden. Since 
these properties are now included in New York State Park reserva- 
tions, and therefore unavailable, they were not visited by the writer. 
None of them has been active for very many years, most of 
them having ceased operations before 1870. The Hogencamp was 
the only member of the group producing ore between 1870 and 1880. 
According to Putnam’**® this mine was worked by means of an 
open cut 250 feet long and 60 feet deep, the ore body having a 
thickness of from 12 to 15 feet, with very irregular walls. 
The ore carries both pyrite and pyrrhotite; an analysis given by 
Putnam (op. cit.) shows the following: iron 52.93 per cent, sulphur 
2.399 per cent, and phosphorus 0.033 per cent. The writer has no 
personal observations to offer. 
THE WARWICK GROUP 
A subsidiary belt of magnetite lies along the summit of Warwick 
mountain, about 2 or 2% miles south of Warwick. Several old mines, 
operated many years ago by the Parrott Iron Company and by the 
Warwick Iron Company, are situated in this belt of ore. 
The Standish mine. This mine lies one-fourth of a mile north 
of the east fork of the highway leading south from Warwick, on 
Warwick mountain. A thin body of ore, not over 2 to 8 feet thick, 
may be traced for over one-half of a mile; along this cuts were 
made and shafts of unknown depth were sunk. The strike of the 
ore body is N. 30° east, and the dip is essentially vertical. A fault 
cuts off the ore on the northeast end, beyond which the ore is not 
again in evidence. There are other signs of old workings and one old 
shaft on the southeast slope of the same ridge. The property has 
not been in operation since 1880, and shafts and cuts all have water 
in them and are inaccessible. From what could be seen on the ground, 
the walls of the ore body are typical Pochuck-Grenville, heavily 
injected in places with dioritic pegmatite (pegmatitic facies of 
Pochuck). In other places a coarse granite, probably Pochuck 
eranite, forms part of the walls. Much coarse, feldspathic, dioritic 
pegmatite, containing end-stage interstitial magnetite, may be found 
on the dumps, together with coarse granitic rock, essentially Pochuck 
granite. 
139 Putnam, B. T. Tenth Census Report, 1880. 
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