THE ADIRONDACK GRAPHITE DEPOSITS 79 



rich in pyrite. The rock owes its foliated structure to subparallel 

 arrangement of the graphite and the biotite flakes. The graphite 

 flakes in the thin section studied vary from 0.02 millimeter to 0.015 

 millimeter wide and range up to 0.9 millimeter in length. The 

 average length is not over 0.5 millimeter. 



" The mill of this company was situated at the quarry, but at the 

 time of the writer's [Bastin] visit had not been' running for many 

 years. The equipment includes a jaw crusher, crushing rolls, a 

 stamp mill with two batteries of five stamps each, an inclined screw 

 washer, Wilfley table, two buddies, and a flotation separator of 

 special design." 1 



Chemical analysis of the Adirondack Company's ore 



Si0 2 65 . 10 



AI2O3 9-15 



Fe 2 O s 4.68 



FeO 3 .09 



MgO 2.21 



CaO 1. 71 



Na 2 .24 



K 2 2.32 



H 2 — .50 



H 2 + 2.33 



Ti0 2 .96 



C0 2 None 



P*0 5 .74 



S ' 326 



MnO .03 



FeS, 



C Graphite 529 



Total 101 . 61 



Less O : 1 . 63 



Total 99-98 



Analysis by George Steiger, U. S. G. S., Bui. 591, p. 40. 2 



The Silver Leaf Graphite Company 



"A prospect opened by the Silver Leaf Graphite Company " in 

 1904 " is situated in the woods about a mile west of the Champlain 

 Company's mine. It consists of one pit 15 feet wide and 40 feet 

 long and 5 to 6 feet deep. The ore is similar to that at the Cham- 

 plain mine. The graphite schist strikes 40 west and dips 25 



1 Bastin, E. S., Mineral Resources, U. S. G. S., 1909, 2: 823. 



2 F. W. Clarke gives this analysis in U. S. G. S. Bui. 591, p. 40. Bastin, 

 Econ. Geol., 5:141, gives the identical analysis for the American Graphite 

 Company's ore. As it seems highly improbable that the schists of the two 

 localities should be exactly alike, it seems "very likely that some error has occurred 

 in ascribing the analysis to both companies. As Bastin uses the value 5.29 

 per cent in accounts of both of these properties he is possibly unaware of the 

 matter. 



