80 NEW YORK STATE MUSEUM 



west of the shaft in the hanging wall and is tapped underground 

 by cross cuts from the main levels. This body is smaller, about 

 4 feet thick at the surface and 150 feet wide in the drift at the 200 

 foot level. The ore is intersected by small slips or faults. One 

 fault is seen on the second level at the south end where it is accom- 

 panied by a sheeted zone of limestone that apparently terminates 

 the ore; it lies near the edge of the limestone and is concealed at 

 the surface by the alluvial beds that floor the adjacent valley. Evi- 

 dences of faulting are found on the surface northeast of the shaft 

 in the occurrence of a fracture zone which cuts across the bedding 

 of the limestones ; the zone is 3 feet or more wide. 



About 800 feet northeast of the working shafts on the opposite 

 side of the limestone ridge, an outcropping lens of ore has been 

 prospected at the surface and for some distance underground, but 

 has not been actively worked. The sulphides here occur in bunches, 

 bands and as disseminations, intermixed with secondary silicates 

 and limestone. The shape of the deposit is like a thick lens or 

 shoot, but is less well defined than the bodies previously described. 

 There is evidence of crushing and differential movement within the 

 ore, which may be partially accounted for perhaps by the greater 

 amount of silicates that have undergone hydration and swelling. 

 The ore shades away at the edges into the country limestone. 



The ore from the property is rich as compared with the usual 

 grades of zinc blende that are now mined in this country. The 

 product of the present openings is a mixture of sphalerite and 

 pyrite with variable but usually small amounts of gangue. The 

 sphalerite predominates over pyrite, but samples may be gathered 

 which show the two minerals in nearly equal proportions. The 

 texture is very compact, with no vugs or openings of any size, the 

 grains being firmly interlocked. The individual particles have 

 rounded and irregular outlines. The grain varies from rather 

 coarse to fine, the coarser ore being found in the larger and richer 

 bodies; the disseminated sulphides are usually finely divided. The 

 ore now mined probably averages 25 per cent or more in zinc. The 

 sphalerite is dark, almost opaque, as seen in the hand specimen, 

 indicative of considerable combined iron, which is confirmed by its 

 magnetic permeability. In one part of the Edwards mine, ore of 

 light brown color has been uncovered. Galena occurs in small 

 amount, less than 1 per cent, but is seldom discernible in the hand 

 specimen. The presence of barite in the gangue was determined 

 from specimens taken by the writer several years ago from the out- 

 crop. It is of subordinate importance. The principal ingredients 



