80 NEW YORK STATE MUSEUM 



east." 1 Bastin reports that quartzite layers are present at this 

 locality ; it is quite possible that the Swede Pond quartzite is exposed 

 above the ore. 



" The company has no mill." The property is today abandoned. 



The International Graphite Company 



Location. This abandoned property is situated in the township 

 of Chester, in Warren county, 3^ miles west-northwest of Potters- 

 ville on the southern edge of the Schroon Lake sheet, just to the 

 east of the junction of Trout and Alder brooks. It lies in a 

 depression which represents a limestone valley. 



The mine was opened prior to 1900. In 1901 the plant was 

 enlarged, although at that time the continuous presence of pay ore 

 had not been demonstrated. 2 



Workings. The workings consist of an inclined shaft sunk to 

 150 feet from which a drift has been driven; a vertical shaft, depth 

 unknown; and two small prospect pits. 



Geology. W. J. Miller 3 has mapped the area on the quadrangle 

 immediately to the south of the mine as Grenville limestone and 

 interbedded gneisses. The limestone is well shown at Natural 

 Bridge. 4 This area can be traced into the Schroon Lake sheet to 

 include the International Company's property. The knowledge of 

 the stratigraphy is not so complete as would be desirable, but the 

 essential features apparently are as follows : 



The ore bed is a quartz-feldspar schist 18 to 25 feet thick dipping 

 25 N 50 W (magnetic). This grades into the overlying layers 

 which contain more and more mica until a mica schist is the 

 dominant type. Above is an amphibolite, which very likely repre- 

 sents an altered impure limestone formation, as will be pointed out 

 later. Succeeding the amphibolite is a thick bed of limestone, with 

 interbedded layers of granular, siliceous rock. This is overlain 

 by another amphibolite. This group of rocks, above the ore, taken 

 en masse, very probably is equivalent to the Faxon limestone that 

 we have noted before. But on the International property this is 

 a thick formation, the upper beds possibly representing a replace- 

 ment of part of the Swede Pond quartzite by limestone. Succeed- 

 ing this group is a quartz gneiss often with garnets and shreds of 

 mica. It is seamed and cut by igneous injections to the extent that 



1 Bastin, E. S. Mineral Resources, U. S. G. S. 1909, 2:823. 



2 The Mineral Industry for 1901, p. 369. 



3 Miller, W. J., New York State Mus. Bui. 170. 



4 Loc. cit., plate 1, facing p. 10. 



