No. 101.] 
57 
shaft, opened many years since, and which now'performs the part 
of a ventilator. At the base of the hill, a level has been commenc- 
ed, which is intended to cross the deposite of ore, and will when 
completed be about 150 feet in length. The following is a notice 
of the minerals found at this locality. 
The galena is both crystalline and granular. It is associated 
with quartz, and occasionally has mixed with it some carbonate of 
lime. But the former constitutes the principal gangue, and the dif- 
ficulty of separating it from the ore, renders the processes neces- 
sary for its reduction comparatively tedious and expensive. 
Analyses of Galena from the Jlncram Lead Mine, 
No. 1. No, 2, 
Sulphur, 13.00 Sulphur, 12.68 
Lead, 83.65 Lead, 81.61 
Silica, 3.50 Silica, &c 5.71 
Carbonate of lime, a trace. . " 
100.15 
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 associated with the ga- 
lena, both of them having a brown color. The one is foliated, the 
other compact 
•Analysis of Sulphuret of Zinc from the Jlncram Lead Mine, 
No. 1, Compact, No, 2, Foliated, 
Sulphur, 33.56 Sulphur, 33.20 
Iron, 4.30 Iron, 6.45 
Zinc, 61.64 Zinc, 57.85 
Silica, 0.50 Silica, 2.50 
100.00 100.00 
Pyritous copper of a golden yellow color is also occasionally met 
with at this locality. It is composed of sulphur, copper and iron 
[Assem. No. 161.] 8 
