34 New york state museum 



a part of the year. The work consisted mainly of development 

 incident to a change from surface to underground methods of 

 mining. The deposit along the outcrop has been decomposed with 

 the formation of clayey matter which complicated the separation 

 of the graphite. The matrix is a feldspathic quartzite resembling 

 that at the American mine, but the flake averages a little smaller 

 in size. Two distinct beds are in evidence, separated by 4 feet of 

 limestone and barren quartzite. The upper bed has a thickness of 

 from 10 to 14 feet and the lower of from 4 to 5 feet. The imme- 

 diate walls consist of mica schist, carrying pyrite, but thick-bedded 

 garnetiferous gneisses occur in the upper part of the series, south 

 of the workings. The outcrop of the beds strike nearly east and 

 west and is marked by a slight depression in the easterly sloping 

 ridge. It is traceable for 1500 feet or more from the present mine 

 openings which are at the eastern end of the outcrop. The dip is 

 about 30° so.uth. The principal development aside from the open 

 cuts consists of an adit driven in the side hill along the course of 

 the upper seam for a distance of about 125 feet. Additional work- 

 ings will be necessary before the mill can be maintained in steady 

 operation. This is a large concrete structure situated on the side 

 hill at the mines. It is equipped with a gyratory crusher, 10 stamps, 

 and rolls for the reduction of the ore. The separating equipment 

 includes buddies, settling tanks, screens and dryers. 



The Saratoga Graphite Co. has lately erected a mill near Kings 

 Station north of Saratoga Springs. 



The other properties in the eastern Adirondacks that have been 

 active during the last few years include the Conklingville mine of 

 the Sacandaga Graphite Co., and the mine near Chilson lake, owned 

 by the Crown Point Graphite Co. 



A small quantity of graphite has been shipped recently by the 

 Macomb Graphite Co., from its property near Popes Mills, St 

 Lawrence county. 



GYPSUM 



• The remarkably rapid progress that has characterized the gypsum 

 industry during recent years was interrupted in 191 1 and the out- 

 put showed a decline amounting to about 4 per cent. The setback 

 may be attributed doubtless to the lessened activity in the building 

 trades, as most of the output was used for the manufacture of 

 calcined plasters and for admixture with portland cement. There 

 was a similar falling off in many other industries based on the pro- 

 duction of building and structural materials. It may also be said 



1 



at ^ 



