75 
but its southern and northern limits are obscured by overlying soil and hill 
detritus, weathered from the surrounding Silurian strata. 
» 
West 
East 
Fig. 30.—Section showing A. Diorite; B. Silurian strata; C. Fault veins. Scale 
approximately, 8 feet to 1 inch. 
The metalliferous portion occurs in the harder kernels in the diorite on 
the western side of the boss where the hornblende is large and predominant 
(Fig. 30). The eastern side of the boss is of a much finer character, and 
S/LUP/AU 
lowest cur 
'ASSAY. 498 
soo 
, so/ 
' 2 , UORN8LEMDE 
-jo D/OR/TE 
MIDDLE CUT 
ASS AT SO2 
top cur 
Fig. 31.—Plan showing Position of Three Open Cuts. Scale, 30 feet to 1 inch, 
large hornblende is scarce. The hard kernels vary from 1 to 2 feet in diameter, 
and contain the copper carbonates, azurite and malachite, mostly on the 
outside of the kernels, with copper pyrites in small crystal aggregations 
about the centre. The workings have been carried on from three open 
cuts (Fig. 31), the lowest one having an underlay shaft sunk for 30 feet, with 
a short drive to the east for a distance of 9 feet. In this shaft a number 
of ore patches in kernels were passed through, and several slickensided fault 
veins carrying asbestos and asbestiform quartz. 
