51 
Silurian rock, the balance being in unaltered sandstones and mudstones 
of light to dark grey colour. Iron pyrites is abundant in the beds. 
At 300 feet north of the engine shaft is Upton’s shaft, 150 feet deep, 
Irom which payable stone has been obtained. At 190 feet south of the 
engine shaft is the whip shaft, no feet deep, from which the quartz is 
being hauled. The prospecting shaft, 80 feet deep, is 50 feet south of 
the engine shaft; and on the bank of the Yarra River, still further to the 
south, is Grant’s shaft, 90 feet deep, not now used. From this shaft 
quartz yielding as much as 7 ounces per ton is said to have been obtained. 
All mese workings are on a flat on the eastern side of the Yarra. 
The strike of the Silurian rocks is about north and south, and tEe dip 
at the bottom of the whim shaft is 40 degrees to east. The general strike of 
the reef channel is about north 32 degrees west. The pitch of the country- 
rocks is northward. 
Auriferous quartz is being stoped at the no-feet level and about 250 
feet south from the whim shaft. This level is extended to 310 feet south 
from the whim shaft. There is a distinct lode formation, with up to 
4 feet of broken country-rock, and a quartz veinstone between the walls. 
The lode channel has been fractured and displaced by a series of faults, 
striking a few degrees west of north ; the channel in each case going 
north, is thrown to the west. Although the channel is thus displaced, the 
quartz veins are continuous across the faults, as though they had been 
formed later. The dip of the lode is 85 degrees to west. Besides the 
principal quartz vein, ranging from 3 inches up to 2 feet in thickness 
in the channel, there are also auriferous quartz veins, an inch or up to 
3 inches thick, in the countrv-rocks. In fact, the country-rocks are not 
explored, and more cross-cuts should be put in to search for other quartz 
veins, especially on the western side, where centre-country must lie. 
Recently 205 tons of quartz have been crushed for a return of 387 ozs. 
5 dwts. of gold. If properly opened up, this promises to be a productive 
mine. At 90 feet to the east is the Black Swan reef, from which some 
rich patches of quartz are reported to have been taken. This line of reef 
could be conveniently prospected or worked from the Caledonia workings. 
Southward from the Caledonia mine, what is considered the same reef 
was worked as the Yarra Tunnel mine, and from it excellent returns are 
reported. Other reefs that have been worked in this localitv are the Pig 
Tail (now called Hornabrook’s Reward') and the Victory, right in the 
township of Warrandyte. The “ Dyke,” a few chains to the east from 
the Caledonia, has been extensivelv worked also. 
[Report sent in 28th August , iQOg.] 
THE CUMBERLAND AND PHCENIX MINE, CAMPBELL’S 
CREEK, CASTLE MAINE. 
(NO. 24 ON LOCALITY MAP.) 
By E. /. Dunn, E.G.S ., Director , Geological Survey. 
The shaft now being worked is on the Phoenix line of reef. The depth 
of the shaft is 236 feet. The No. 1 level, 136 feet from the surface, 
has been driven 100 feet to the south. The pitch of the country-rocks at 
30 feet south from the shaft is 33 degrees south. From this level 
auriferous quartz was worked across for 40 feet in width, and right up to 
the surface. The quartz tapered as followed upwards. This averaged 
about 4 1 dwts. of gold per ton. A considerable proportion of country- 
rock is commingled with the quartz. Over the No. 1 level is an intermediate 
level, showing section as in Fig. 19. The wall of the reef on the western 
