82 



NEW YORK STATE MUSEUM 



schist. As we shall see later, the Rowland and the Sacandaga ores 

 are very similar. The flake is comparatively large and interleaved 

 with the pyrite and mica. 



The percentage of biotite is sufficiently high to give serious diffi- 

 culty to the miller, which was the case, the writer was informed. 

 Certain specimens taken from the dump show a decided approach 

 toward hydrothermal action, almost veiny in habit. 



Quantitative microscopic analyses of the International ores 





No. 741 

 Ore bin 

 typical 



No. 742 

 Ore dump 

 very rich 



No. 739 

 Second 

 prospect 

 hole east 

 of shaft 



No. 745 

 Concentrate 





Grapr 

 Biotit 

 Chlor 

 Andes 

 Quart 

 Pyrite 

 Apati 

 Diops 

 Tourn 

 Horn! 



TOTAI 





7.1 



5.7 



trace 



20.6 



38.8 



22.1 



1.1 



3.4 



2.2 



none 



100.0 





4.5 



trace 



trace 



50.0 



2.0 



2.3 



.2 



22.0 



none 



19.0 



100.0 





o (1 









§ fS 









by 









w£ 















<% 



»§ 



;e 













o 2 















fc G 









< 











ii 





1 . 04 mm 



X 



1 . 61 mm 



2 . 40 mm 

 .50 mm 



1 . 68 mm 



X 



2 . 50 mm 

 5 . 20 mm 



.85 mm 













X 



.77 mm 







1 . 50 mm 



< 



Minimum 





.30 mm 



H 







<: 

 u 



5 * 



Z H w 



a w 



Average 



Maximum 



Minimum 



1 . 03 mm 



1 . 70 mm 



.40 mm 





.43 mm 

 .90 mm 

 .20 mm 













H 

 to 







O 

 U 



M O 



£ w 



H H 





.042 mm 

 . 080 mm 

 . 025 mm 





. 033 mm 

 .055 mm 

 .018 mm 





(A 

























The igneous activity has brought about a rich ore, specimens of 

 which can be found that are far richer than the usual Dixon or 

 Bear Pond schists, but the improvement in the amount of graphite 

 is obtained at the expense of uniformity. This element in graphite 

 milling is an important factor and is frequently overlooked. It is 

 not difficult for the writer to appreciate this cause in the failure of 

 the company. 



Faults. In the bed of Alder brook, at the bridge just before 

 reaching the mill, the pink Algoman granite is splendidly shown in 



