THE ADIRONDACK GRAPHITE DEPOSITS 59 



Analyses of the Lakeside ores 



CHEMICAL ANALYSIS 



QUANTITATIVE MICROSCOPIC ANALYSES 



Lower 



portal 



Higher 

 portal 



Ore 



dump 



No. 2569 



No. 758 



No. 761 



No. 765 



Si0 2 . . . 

 AI2O3. . 

 FeiOs . . 

 FeO... 

 MgO.. 

 CaO. . 

 NaaO.. 

 K 2 0... 

 HoO— . 

 H2O + . 

 Ti0 2 . . 

 CO2... 

 P*Os. . 



S 



MnO.. 

 FeS 2 . . 

 C 



Total. 



76.37 

 6.75 



1.66 



.91 

 1.42 

 1.04 

 1.32 



.38 

 1.22 



.59 

 none 



.74 



3.54 

 4.63 



100.08 





Graphite. 

 Biotite.. . 

 Chlorite . 

 Feldspar . 

 Quartz. . . 

 Pyrite . . . 

 Apatite . . 

 Total. . . 



w w 



H W 



Q < 

 X 



Zo 



z z 



J X 



Average. 



Maximum . 

 Minimum . 



Average . . 

 Maximum. 

 Minimum . 



Average . . 



Maximum 

 Minimum . 



9.1 



.2 



.2 



8.0 



72.5 



9.1 



.9 



100.0 



9.6 



.2 



.2 



7.5 



81.2 



1.0 



.3 



100.0 



. 69 mm 

 x 

 . 80 mm 



1. 15 mm 



. 54 mm 



. 89 mm 

 x 

 1 . 03 mm 



1 . 50 mm 



. 42 mm 



. 71 mm 



1 . 20 mm 



. 30 mm 



.91 mm 



1 . 90 mm 



.40 mm 



.073 mm 

 . 090 mm 



. 050 mm 



. 060 mm 

 .125 mm 

 .020 mm 



. 59 mm 

 x 

 .84 mm 



1 . 09 mm 



. 40 mm 



The chemical analysis by Chase Palmer in the laboratories of the United States Geological 

 Survey, U. S. G. S. Bui. 591, p. 40. 



The quantitative microscopic analyses by camera-lucida-polar planimeter method. These are 

 approximate values by weight. 



The exact cause of the abandonment of the Lakeside mine is 

 not known to the writer, but the suggestion has been made that 

 when the drifts extended below the level of the portals so that the 

 water had to be pumped, the company ceased work and confined 

 its attention to the deposit at Graphite. From what the writer 

 observed .there appears to be plenty of ore still unmined and it is 

 quite possible that interest may be renewed in this locality. 



The mill, which has been partly demolished, used the dry method 

 of concentration, employing Hooper air jigs. 



