1504 The American Geologist. November, i897 
low tlu; level of the quarry lloor at nearly right angles with 
tlie strike of the formation. It therefore cross-cuts members 
of the formation next below the horizon of the ore-belt and 
just penetrates the hanging wall of the main ore-body. These 
members are essentially foliated and gnarled hornblendic 
gneiss only slightly epidotic at this level and sparsely strewn 
with zircons. The thickness of the ore-body on the tunnel 
line is 87 ft. Measurements, however, vary with the section, 
and, apart from a few as already given, exact dimensions re- 
main undetermined. Exploration b}' diamond drill 142 ft. be- 
yond the innermost heading reveals alternations of ore and 
pyroxene and amphibole more or less epidotic. This goes to 
show the presence if not the maintenance of ore-lenses at this 
level the same as in the upper workings, but none of remark- 
able thickness. Their indication is rather of the attenuation 
of lenses or concentrations of which larger sections are ex- 
hibited in the face of the quarry. The lack of sharp demar- 
cation in the ore lenses renders boring unsatisfactory as a 
mode of exploration. The following inverse section was re- 
corded : 
-rj, f ^ Gneiss more or less ferriferous. . . 101 ft. 
iixcavation ^ ^^^^j^^ ^^.^ j^^^^ ^^ ^^^j^ jg^^j ^^ j.j._ 
6 ft. " Ore 6 ft. 
29 ft. Sin. " Epidotic gneiss 23 ft. Sin. 
34ft. Sin. " Interval 5ft. • 
3S ft. 2 in. •' Ore 3 ft. 6 in. 
41 ft. 11 in. " Ore and amphibole (pyroxene?) 3 ft. 9 in. 
42 ft. 3 in. '• Good ore Oft. 4 in. 
46 ft. 10 in. " Interval 4 ft. Tin. 
S8 ft. 6 in, " Good ore 41 ft. S in. 
142ft. 3in. " Interval 53 ft. 9 in. 
The lower workings have been carried upward so as to open 
into earlier workings connecting with the upper tunnel, so- 
called, 35 ft. higher, or 65 ft. above water level. This was 
driven through about 80 ft. of talus round a turn of the hill- 
side so as to reach the ore belt on the strike, and therefore 
nearly at right angles to the lower tunnel now in use. It thus 
gives access to a portion of the main ore body on the dip in- 
termediate between the quarry and the lower workings, and 
especially to solid ground not yet penetrated from the lower 
level but still below the level of the quarry. Ore broken on 
this level can be delivered through the lower level, the two 
workings having been "holed"' through on the foot wall. 
