56 
[Assembly 
Analysis of Galena^ from Martinsburgh, Lewis county. 
Sulphur, 11.97 
Lead, 77.15 
Iron pyrites, carbonate of lime, &c 10.88 
100.00 
Accompanying this ore is a mineral which was supposed to con- 
tain tin. Although I was aware that there was liitle prospect of 
finding any compound of this metal in this region, I nevertheless 
subjected a portion of it to analysis, when (as I had supposed,) it 
was found to be bisulphuret of iron, with variable proportions of 
carbonate of lime. 
I have only to add, before concluding my notice of the lead and 
zinc ores of this part of the State, that I found blende in a vein of 
calcareous spar, in the town of De Kalb, St. Lawrence county; 
but at the time of my visit it was not possible to form any estimate 
of its extent. 
One locality of lead ore remains to be described. And it is that 
which has long been known by the name of the Ancram Mine, It 
is situated in the southern part of Columbia county, about four 
miles south-east of the Ancram furnace, in a hill composed ot slate 
and limestone. At this mine two or three veins of galena may be 
observed on the surface, which with their gangue vary in width 
from a foot to three or four feet. When they widen, as they some- 
times do, the ore is very sparingly disseminated in the calcareous 
spar and quartz which constitute its principal associates. 
The occurrence of the lead ore at this locality, reminded me of 
that of the copper ore at Flemington, New Jersey. It does not 
appear to constitute a true vein, but to be a collection of strings 
communicating with beds of various dimensions. These strings 
are parallel with the strata and not at right angles to them, and 
in no case did I observe the ore separating from the walls as it 
often does at the Rossie vein, but it gradually loses itself in the 
accompanying rock. 
The mine seems at present, to be judiciously worked, although 
I have reason to believe that it has not answered the expectations 
of the proprietors. The principal shaft is about 70 feet in depth, 
and from this runs a shore level which communicates with another 
