THE ADIRONDACK GRAPHITE DEPOSITS 



47 



fault is the main " cut-off." Again to the east is a similar fault 

 but of less magnitude. The evidence for this fault is just as 

 positive. To the east of both, the main and the bastard beds out- 

 crop. The thickness of the two here is apparently the reverse of 

 that exhibited in the main mine. 



The summer pit was intermittently worked for a number of years 

 during the summer (hence the name). It has lain idle for some 

 time until recently. Considerable ore has been mined along the 

 strike but not much along the dip as the miners are close to the line 

 of the Wheeler lot, of which the mineral rights are owned by W. H. 

 Faxon. The southern end of the Summer pit bed is probably cut 

 off by a fault. This is not proved and hence it is indicated upon the 

 map by a dashline. It is reported that the northern end dies or 

 pinches out. The writer had no opportunity of investigating this. 



Q .1 .2, .3 A .5 .6 .7 -8 .9 ) ■ ..--_-; 



MILLIMETER A VV - i - V 



IGRAPHITE IlFYRITE E3FELDSPAR 



IDbiOTITE, □ QUARTZ ^APATITE 



Fig. 7 Cammera-lucida drawing of microscopic thin 

 section of very high-grade Dixon ore from the main 

 mine. (Specimen 850). H. L. Ailing, 1918. 



To the south of the bridge over North pond outlet an exposure 

 of the Trumbull gneiss was found. The particular specimen 

 examined microscopically probably represents the transition from 

 the Trumbull to the Hague gneiss — the footwall of the graphitic 

 schist. Thus there is the possibility of a bed, probably dipping 



