222 
Scientific Proceedings, Royal Dublin Society. 
shaft. It is generally supposed to be a continuation of the main 
sulphur lode in Tigroney and West Cronebane ; but as they differ 
from each other so much in character and composition I am led 
to believe that the lode in the upper mines (Hast Cronebane and 
Connary) is quite distinct from that in the lower mines (Tigroney 
and West Cronebane). The following are the principal differ- 
ences -— 
Upper Mines. 
The gossan* occurs in bunches 
in masses of ferruginous clay, and 
never occupies the full width of 
the lode. It contains auriferous 
silver. 
“ Coal ground” occurs in large 
masses. 
The iron pyrites never fills the 
lode, but occurs in cakes or lenti- 
cular masses in the filling stuff. 
The iron pyrites does not become 
coppery in depth. The clays or 
“soft ground” that forms the fill- 
Lower MINEs. 
The gossan in mass occupies the 
the full width and length of the 
lode. No trace of auriferous silver 
can be found in it. 
No “coal ground” occurs, ex- 
cept in minute quantities. 
The iron pyrites nearly invari- 
ably occupies the full width and 
length of the lode ; in depth it 
becomes coppery. Near the sur- 
face there is a little soft ground, 
but none is found in depth. 
ing stuff of the lode continues soft 
down to its full depth. 
The country on the north and 
south of the lode, except the fel- 
stone in the Lodge level, is very 
little mineralized. 
The country on the north and 
south of the lode is more or less 
mineralized, especially the latter, 
in which occur copper lodes for a 
width of 25 fms. from the hanging 
wall. 
The associated country rocks of the lodes in the two places are 
also different; the bearings of the lode are also different, as fol- 
lows :—Tigroney Mine, from the great flucan to the reversed 
fault, N. 65° E. ; from the reversed fault to the boundary fault, N. 
70° E. Cronebane West, from the boundary fault to the “ Dead 
Ground,” N. 85° EK. Magpie Mine to the N. 32° E. head, N. 60° 
E.; along the head to Connary Mine, N. 32° E.; from the N, 
32° E. head to Kilmacoo, N. 60° E. 
The mineral channel at Kilmacco is possibly heaved northward 
about 1,000 fms. by the Kilmacoo east head, for at that distance 
northward to the east of the head, in the townland of Rockstown, 
are “shode stones” and lodey indications; they, however, as yet 
* This gossan could not be shown in detail in the cross sections owing to the smallness 
of the scale; therefore the gossan and ferruginous clays are shown as gossan. 
