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in contact with a biotite-rich gneiss different in appearance 
from the biotite gneiss at the top of the cliff. The graphite 
ore-body is situated underneath the diorite sheet and 
at the contact of the limestone with the gneiss. The 
graphite is in the limestone rather than in the gneiss, 
Columnar graphite and altered Grenville limestone, Walker mine [Nelly’s pits]. 
though some of the latter is impregnated with graphite. 
The ore-shoot is about 30 feet (9-I m.) wide and the same 
in length. It strikes N.S. and pitches 57° to the south, 
and has been worked by means of a tunnel, now filled with 
water. The ore-body and the igneous sheet above it can 
be likened to the stalk and head of a mushroom, an analogy 
