THE ADIRONDACK GRAPHITE DEPOSITS 



Concentrates 



103 



GRADE 



No. 2 Fk No. 2 Fk 



No. 3 Fk 



No. 4 Fk 



Dust D3X 



M 

 u 



H 

 W 



Average ...... 



.42.x. 58 mm 

 .91 mm 

 . 20 mm 



.43.X.66 mm 

 . 90 mm 

 .28 mm 



.27.X.48 mm 

 .70 mm 

 .20 mm 



.14x.23 mm 

 .59 mm 

 .09 mm 



.09.X.15 mm 

 . 20 mm 



1 



5 















Some 



quartz 



very little 



biotite 



Some 



quartz 



very little 



biotite 



Some 

 quartz 



some 

 biotite 



Lots of 

 biotite 



and 

 quartz 



Biotite, 

 quartz, 

 feldspar 

 in large 

 amounts 





Chemical analysis 1 



90.80 



86.88 



87.54 



54.40 



<:6.80 



1 Chemical analyses by H. F. Gardner. 



It is a quartz-schist having a considerable range in the amount 

 of the micaceous minerals, the small-sized flake sample showing the 

 lowest content. The injection of the pegmatites has mussed up the 

 flakes, twisting and fraying them into fantastic forms. In the prox- 

 imity of pegmatites the ore is usually more abundant in graphite and 

 in pyrite. The distorted and split character of the flake present 

 special milling problems. . It might be well to ignore this form of 

 schist in mining, selecting rock free from pegmatitic material. The 

 ore from the back stope is regarded by Mr R. L. Dowling as the 

 best ore. True, it probably does carry a high percentage of graph- 

 ite, but the mica is present in detrimental amount. 



Mining practice. The ore is hauled up the steep slope in small 

 mine cars by a cable system to the surface, onto a mill car loading 

 platform. From there the ore is transferred by a shute to automatic 

 dumping cars and pulled into the rear of the mill. An air com- 

 pressor of Ingersoll-Rand manufacture, located in a shed near the 

 portal of the slope, supplies air for the drills. In the same building 

 is located a very neat Delco generator driven by a gasoline-kerosene 

 engine which keeps a storage battery charged. The latter supplies 

 the electricity for lighting the mine and the mill. 



It is the opinion of the writer that the original mining layout was 

 unfortunate. The present system necessitates pumping and a 

 double car system. It is suggested that the old opening, which 

 was known as " No. 2," be extended farther down the dip and 

 along the strike to the west and overhand stoping be employed in 

 working up the dip, allowing the loosened ore to gravitate to the 

 mine cars below. This drift might be extended to the bottom of the 



