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[Assembly 
show its existence, but unless larger veins should be discovered, the 
profit must, from past experience, be hopeless. No further attempt 
should I think be made to resume this virorking, before parallel north 
and south trenches are opened in order to ascertain the viridest and 
most promising of them. 
In the same limestone rock, near the head of the small falls, in the creek 
at Lowville, there are small excavations on the left side of the stream, 
from which ore supposed to contain silver, existing in narrow veins, was 
extracted. The ore proved to be galena, blende and copper and iron 
pyrites, having for matrix carbonate and fluate of lime. Both these lo- 
calities were noticed mineralogically by Dr. Beck. 
The ore occurs in the same system of cracks or joints as at Martins 
burg, and clearly shows an infiltration or exudation from the rock, both 
galena and blende having been found at the latter place enveloped by the 
solid rock, so as to leave no doubt, that the rock was the source from 
whence the veins derived their material. The occurrence in these two 
places of metallic minerals, in an east and west direction, a fact so ge- 
neral in all countries, is of importance to the true theory of veins, and 
show a connection with the galvanic one, either as cause or effect, and 
wholly adverse to the theory which makes them the result of injec- 
tion from below, for in that case there would be no difference as to 
quantity of ore, in the different systems of veins or fissures. 
Besides these facts, there are others in the third district which show 
that injection could not have been the operating cause. Of the five lo- 
calities where ore exists in veins, two of them are in the upper part of 
the Trenton limestone, and two in the lower part of the black slate 
which rests upon that limestone. These facts show a connection be- 
tween the veins and the rock, and moreover, they are cut off from the 
source of injection, if the primary rocks be that source, by the Mohawk 
limestone, the fucoidal layers and the calciferous sandrock, none of these 
rocks in the third district showing ore in veins or in like abundance. 
The fifth fact is the instance cited in the second report, of a small vein 
of lead ore, existing at the junction of the black slate and Trenton lime- 
stone with the " calciferous sandrock" and " bird's eye" limestone, at 
the up-lift on East Canada creek, and there the ore is on the side of the 
two former, and not the latter rocks. 
