TDK ADIRONDACK GRAPHITE DEPOSITS 



«9 



Quantitative microscopic analyses of the Rowland ores 









No. 734 

 Ore bin 

 typical 



No. 731 

 Base of 



outcrop 

 in the 

 trench 



No. 732 

 Five 

 feet 



higher 

 than 731 



CONCENTRATES 







No. 736a > 



No. 736b 2 



z 



Grap] 



Biotit 

 Chlor 

 Andes 

 Quart 

 Apati 

 Diops 

 Titan 

 Ortho 

 Tourr 

 Zircor 

 Pvritf 

 Tota 





9.4 



trace 

 1.5 

 none 

 none 

 trace 

 84.7 

 trace 

 none 

 none 

 none 

 1.5 

 100.0 



6.5 

 1.0 



trace 



25 . 5 



46 

 trace 



14.5 

 2.0 

 trace 

 none 

 none 

 4.5 

 100.0 



2.1 

 20.3 



trace 

 36.7 

 none 

 trace 

 3.7 

 3.3 

 10.5 

 2.2 

 .1 

 21.1 

 100.0 





• 



o 









H 



ite 







o 



ine-labradorite 







1= 







;e 







o - 







a >, 



ite 







H 









£ o 









X 









o 









2 







■< 











Z 



M z 



a _ w 



sis 



w ■< u 



Q 



Average 



Maximum 



Minimum 



1.22x.89mm 



2 . 40 mm 



. 40 mm 



1 .00x.54 mm 

 1 . 90 mm 



.27 mm 



.67x.52 mm 



2 . 25 mm 

 . 31 mm 



1.05x.61 mm 



2.10 mm 



.30 mm 



.70x.46 mm 

 1 . 20 mm 



.27 mm 



H 



Z 



z o 



" H 



a: u 

 H w 

 o w 

 z z 



H 



Average 



Maximum 



Minimum 



1 .03 mm 



1 . 70 mm 



.60 mm 



. 68 mm 



1 . 10 mm 



.40 mm 



.51 mm 

 .90 mm 

 .25 mm 







3 















as 







fa 

 o 



- z 







(/) H 



H y 



z w 



S X 



Average 



Maximum 



Minimum 



.067 mm 

 . 130 mm 

 .025 mm 



. 050 mm 

 . 100 mm 

 .010 mm 



. 034 mm 

 . 080 mm 

 .018 mm 







35 



















1 Chemical analysis by H. 



2 Chemical analysis by H. 



F. Gardner gives 85.04 per cent graphitic carbon. 

 F. Gardner gives 54 per cent graphitic carbon. 



Such a rich ore is not the usual experience in the bedded deposits 

 of the Adirondacks. Whenever a rich type is encountered, such as 

 at the International, the Rowland and, as we shall see, at the 

 abandoned Sacandaga mine, igneous agencies have left their mark. 

 Pegmatitic action has moved some of the original carbon in the 

 schist from one layer to another. White pyroxenes, usually diop- 

 side, have been developed partly from original primary constituents 

 and partly from introduced magmatic matters. Here at the Johns- 

 burg locality the ore from the center of the bed is exceedingly 

 abundant in diopside (84.7 per cent by weight for specimen 734). 

 This makes a rock very difficult to crush without severe attrition of 

 the flake. Thus there are disadvantages in a rich ore. Further- 

 more, it makes a variable bed that at once presents special concen- 

 tration problems. 



