lUK ADIRONDACK I JRAPl I ITE DEPOSITS 29 



" Woodchuck " holes. At the pits themselves it is not possible to 

 determine what the country rock is, but 55 feet east from the wall 

 pockets on the upper level an exposure of the sandy quartzite schist 

 occurs that shows the relations. The pegmatite overlies the 

 quartzite and has developed the pyroxene-scapolite rock on contact. 

 The line of demarcation between the three rocks is exceedingly 

 irregular, although it is an easy matter to see that the pyroxene- 

 scapolite rock increases in thickness on leaving the quartzite ex- 

 posure to the west. The north wall consists of alternate layers and 

 masses of quartzose and contact rocks. The lenses or blocks of 

 green rock are often " lit-par-lit " injected with pegmatite. They 

 are furthermore frequently fringed with foliated graphite. Near 

 the contact with the pegmatite, the more dense pyroxene rock is 

 comparatively barren of graphite. 



The sixth set of "workings. These are found higher up and to 

 the north of the Fryatt workings. They consist of a narrow trench 

 showing the pegmatite in contact with a quartz-feldspar rock wmich 

 appears to be of sedimentary origin. 



Other zvorkings. South of the old road, supposedly to the east 

 of the " Woodchuck " drift, there is said to be another group of 

 workings known as the " Old Indian " wmich the writer was unable 

 to find. 



Summary of the pits. Four different members of the sedimen- 

 tary series of rocks can be seen on the hill. Under certain conditions 

 the pegmatitic granite has developed graphite on contact with every 

 one of them : in the " Woodchuck " with limestone ; in the Old Lion, 

 the Young Lion and the higher pits with amphibolite ; in the Fryatt 

 with sandy quartzite; and in the sixth set with quartz-feldspar 

 gneiss. 



The ore. In every case the ore sought and mined w r as a variety 

 of contact rock. It is often a most beautiful rock making very 

 attractive museum specimens. The flake is frequently as large as a 

 dime. An analysis of the Lead hill graphite, as given by Cirkel 1 

 is as follows: 



Carbon Hydrogen Ash 



99.87^; 0.11$ 0.02V 



1 Cirkel, Fritz, Can. Geol. Surv. Dep't of Mines, Mines Br. " Graphite, 

 1907. Analysis by Luzi, Berl. Ber. 1891, 24, 4085. 



