500 
GEOLOGY OF THE FIRST DISTRICT. 
Analysis o f Galena from 
No. ]. 
Sulphur- 13.00 
Iron- 83.65 
Silica_ 3.50 
Carbonate of lime:_a trace. 
100.15 
the Ancram lead mine. 
No, 2. 
Sulphur_•••. 12.68 
Lead-... 81.61 
Silica, &c._ 5.71 
100.00 
“ In some of the specimens of galena, I observed small plates of a yellowish color, which 
may be the molybdate of lead, said to occur at this locality; but I did not find it in sufficient 
quantity to make it the subject of experiment. Two varieties of sulphuret of zinc are asso¬ 
ciated with the galena, both of them having a brown color. The one is foliated, the other 
compact. 
Analysis of Sulphuret of Zinc from the Ancram lead mine. 
No, 1, Compact. 
Sulphur_ 
Iron- 
Zinc_ 
Silica- 
33.56 
4.30 
61.64 
0.50 
Sulphur 
Iron- 
Zinc_ 
Silica __ 
No. 2, Foliated. 
33.20 
6-45 
57.85 ■ 
2.50 
100.00 
100.00 
“ Pyritous copper of a golden yellow color is also occasionally met with at this locality.”* 
The next most important localities noticed were in Northeast, about five miles southeast of 
Pineplains, on the farms of Judge Bockee and Mr, Ward Bryan. Many openings have been 
made on these farms, and lead in some quantity has been procured from them. These mines 
were worked about 1740, by a company of Germans, and the ore was sent to Bristol in Eng¬ 
land, and Amsterdam in Holland. The ore is said to yield forty-five ounces of silver to the 
ton, and the copper ore eighty ounces to the ton. It was not profitable, and was abandoned. 
During the Revolution they were reopened by Peter M‘Daniels, under the direction of the 
Committee of Safety of Congress, with a view to supply the army with lead. Some tons of 
it were procured, but as the mines were abandoned, it is presumed they were not productive. 
The veins cross the strata in a direction nearly west and east. At one of the openings, about 
half a mile southwest of Judge Bockee’s, on Mr, Ward Bryan’s farm, a little north of the 
road, in the second or third pit, we took out forty or fifty pounds in an hour, from a vein about 
an inch wide. This ore is very pure, and will yield about eighty to eighty-five per centum 
of lead, and it is said to contain some silver. The vein is too narrow to warrant mining, un¬ 
less one depends upon the doctrine of chances. Blende occurs in the same vein, in several 
First Geological Report of New-York, 1837, pp. 56, 57. 
