124 NEW YORK STATE MUSEUM 
Considering the strength of the mineralizing action and the char- 
acter of the deposits, it is not unreasonable to assume that a possi- 
bility exists that additional ore may be found in connection with 
both these old mines. 
The Mahopac mine. During the autumn of 1879 and the spring 
of 1880 active explorations were started by the Lake Mahopac Iron 
Company near German Flats, Carmel township. The mine, which 
was subsequently developed, was called the Hill mine, the German 
Flats mine, and ultimately the Mahopac mine; because of the excel- 
lence of the ore, which in origin and in composition closely resembled 
the ore in the Tilly Foster mine, operations were actively prosecuted 
and considerable ore was mined for about 15 years, the shipments at 
one time averaging 6000 tons a month. About 1895, however, a 
fault was encountered which cut off the ore body, and efforts to 
locate the faulted-off portion of the ore were not successful. In 
order to maintain some necessary shipments some of the ore left in 
the mine as supporting pillars was removed, and the roof collapsed 
endangering the lives of the men who were working there at the 
time, some of whom barely escaped. All that is now visible of the 
mine is a small pond occupying the caved portion. 
The ore body of this mine was peculiar in that four “beds” were 
found within a thickness of 90 feet from wall to wall. The “beds ”’ 
were very irregular and of varying thickness, and in places they 
coalesced into two, and again into one “ bed ” (see fig. 13). 
These “beds” of ore were from 10 to 50 feet wide, and because 
of their structural habit and the intervening rock it was unnecessary 
to mine the whole width of the ore body, so that practically all the 
rock between the footwall and hanging wall was left in place, 
answering admirably as pillars for the support of the roof *”. 
When operations ceased the main slope of the mine was 1200 feet 
long on the incline, and there were two additional shorter slopes 
from which drifts were run each way into the ore. 
A complete analysis of an average sample from 12,000 tons of 
ore is given by Wendt (op. cit.) which is of sufficient interest to 
reproduce since the chemical character of the ore is thus shown, 
and a comparison with the Tilly Foster is made possible. The 
analysis is as follows: 
178 Wendt, A. F. The Iron Mines of Putnam County, N. Y. Trans. A. I. 
M. E. 13: 478-88. 1884-85. 
