THE ADIRONDACK GRAPHITE DEPOSITS 



63 



Bear Pond Mountain column 



AGE 



Algoman 



Laurentian (?) 



Grenville. 



ROCK NAME 



Pegmatite 



Granite 



Syenite-granite 



Quartz-syenite 



Metagabbro ■ 



Para-amphibolite, in which are inter- 

 bedded lenses of sandy quartzite 

 and sillimanite schist Beech Mountain 



Graphite feldspar-quartz schist Bear Pond schist 



] Sillimanite schist Catamount schist 



[ Limestone 



Faults. There are two main faults that cut across the area, each 

 resulting in a physiographic depression. As the strata are nearly 

 vertical, the amount of vertical displacement is not known but the 

 lateral displacement of the Bear Pond schist and associated beds is 

 20 to 40 feet. The faults trend in such a direction as strongly to 

 suggest that they nearly converge at the Rock Pond pit. At the 

 western end of the Joan loop the graphitic bed has been greatly 

 dissected and broken apart, probably by cross-faulting and perhaps 

 by injections of the metagabbro. In the vicinity of Rock pond the 

 faults are of frequent occurrence and very puzzling to trace in 

 detail. 



The Bly property. 1 The Bear Pond schist is a bedded deposit 

 which probably has no connection with the Dixon schist. Its place 

 in the general geological column is tentatively suggested as between 

 the Catamount schist and the Beech Mountain amphibolite. 



The Eutoka pit. This is a narrow trench dug along the strike 

 of the bed and reached by a short adit. The rock is usually soft, 

 due to surface weathering. This Bly has experimented with and 

 has produced some good concentrates. 



Bly concentrates 





No. 638d 



No. 638b 



No. 638c 



EUTOKA 

 PIT 



EUTOKA 

 PIT 



EUTOKA 

 PIT 



Average diameter 



Maximum diameter .... 



.64 mm 



X 



1 . 12 mm 



1 . 40 mm 



.32 mm 



.46 mm 



X 



.77 mm 



1 . 30 mm 



.20 mm 



.052 mm 



X 



.067 mm 

 . 130 mm 

 .020 mm 



Minimum diameter 







Estimated per cent 



Graphite 



Nearly 100 



80. o 2 



12.0 



8.0 



12 .0 



Biotite 



28.0 



Quartz and feldspar 





60.0 



1 This property is sometimes referred to as the "Jumbo Mine." 



1 A chemical analysis by H. F. Gardner gives 77.04 per cent of graphite carbon. 



