96 



NEW YORK STATE MUSEUM 



Microscopic analyses and size of the flakes 







Middle Pit 

 Central Zone 



Length of flake 







No. 

 829 





.72 mm 





10.5 

 5.5 

 5.5 



67.5 

 5.0 

 2.0 

 2.0 

 2.0 

 100.0 

















Chlorite 



Microcline-microperthite 



Oliogoclase-andesine 



Thickness of flake 





Average 





Pyrite 



. 098 mm 



Apatite 



Minimum 



.020 mm 



Total 





Contact type of ore. The igneous, or pneumato-igneous, action 

 attributed to the Algoman granite is further shown by the develop- 

 ment of the contact type of graphite. It was found in small amounts 

 in the trench and in the middle pit. The rock that carries the large 

 flake is the usual pyroxene material — the type gangue of the 

 graphite of the northern area. 



Whether or not the richness of the graphite now found in the 

 sedimentary schist is in any way due to the infiltration of any of the 

 contact type is an unsettled question, but the suggestion is worthy 

 of consideration. 



Summing up all the facts and relationships observed, it is very 

 clear that folding, redistribution and igneous agencies have all had 

 a share in the development of the mineral. It is quite certain that 

 the sedimentary type of ore is limited, that it varies in composition 

 and character from place to place, and is too high in biotite, as well 

 as too difficult to crush, to arouse any commercial interest. In 

 regard to the contact type of ore, the conclusions reached from the 

 study of the deposits of the northern area apply here and incline us 

 to abandon any hope that this mine will ever be productive. 



The mill. The company's mill is located 1700 feet to the south- 

 west of the mine connected by a wagon road down which the ore 

 was teamed. A small dam has been built across the stream so that 

 the mill was operated in part by water power. The dryers were 

 supplied with steam from a boiler using cord wood and sawmill 

 refuse for fuel. " Only test runs have been made with the graphite 

 from the mine, but the power was partially utilized for very fine 

 grinding of Ceylon graphite for electrotyping purposes;" The equip- 

 ment included a " Sturdevant crusher, Sturdevant rolls, hexagonal 

 revolving screens, wet screens, a dryer of special pattern, burrstone 

 mill, and equipment for bolting and grading." 1 



1 Bastin, E. S., Mineral Resources, U. S. G. S., 1904, 2:212. 



