144 Journal of the Mitchell Society [March 



that have been completelj- oTanulitized, and tlius have lost all traces 

 of their granular structure. It is significant that few garnets occur 

 at their contacts with the hornblende through which they pass, but 

 that, on the other hand, garnets are frequently found between the 

 hornblende masses and the mar])le surrounding them. Where peg- 

 matites cut the country gneiss in the vicinity of the mine large garnets 

 occur in the gneisses near the contact. It may be fair to assume there- 

 fore that the hornblende masses are a part of the pegmatite, since 

 upon this assumption the presence of garnets between them and the 

 marble is easily explained as due to contact action. Moreover, the 

 hornblende is an altered augite — and in the Cranberry area in Avery 

 County the pegmatites associated with the ore were originall}'' an 

 augitic variety. 



The relations of the pegmatite, hornblende and carbonates, to- 

 gether with the presence of garnets and of streaks of magnetite near 

 the borders of the hornblende are suggestive of contact action. In the 

 old Waughbank Mine the ore was of the same character as that in 

 the Cranbei-ry Mine. If the views of Mr. Cooke are correct the 

 Waughbank ore gradually passed into the limestone ore now charac- 

 terizing the Ashe Mining Company 's INIine. There is very little definite 

 pegmatite in the present mine unless it is represented by the horn- 

 blende streaks and the fine-grained veins described above, but there is 

 pegmatite in abundance in the old Waughbank openings. The horn- 

 blende streaks in the mine now operating may very well have been 

 very basic phases of augitic pegmatite, which added iron and perhaps 

 silica to the limestone and brought about contact action by which gar- 

 nets, phlogopite and actinolite were produced. 



Chemical Composition of the Ore: — A selected sample of the rich- 

 est ore freed from adhering limestone was analyzed b.v J. G. Fairchild 

 of the U. S. Geological Survey, with the result shown below. The anal- 

 ysis^ of the magnetite separated from the ore of the Ahles Mine 

 in New Jersey is given in II for comparison. The Ahles ore is in 

 limestone. 



^ Bayley, W. S. Iron Mines aiid Mining in New Jersey. Vol. VII of Final Report 

 Series o.' State (Jeologist, Trenton, N. J., 1910, p. 111. 



