151 
Some 30 odd years ago a company was formed in Geelong to work 
the Cockatoo Line of Reef, and they drove an adit, about 550 feet in 
length from a small gully to the west of the lode, as shown on the accom¬ 
panying plan, but they appear to have done nothing further. 
The present syndicate have opened out, a drive to the south at 512 feet 
from the mouth of this adit, on a formation of quartz which was 9 feet 
wide, and now shows in the face, at 90 feet, a width of about 5 feet. At 
this point they have begun to rise on the reef, which appears to be dipping 
about 50° to the east, while the strata (chiefly slates) immediately to the 
west of the lode are almost vertical. No section of the strata is obtainable 
beyond the reef as the cross-cut has been timbered up. 
Prospects of gold were obtained near the cross-cut and in the face. 
The manager states that he is getting occasional prospects, but, as yet, 
nothing of a payable nature has been obtained. 
From the information obtainable, there does not appear to be any 
justification for the assumption that saddle reefs are being worked. In 
the best exposed section of the Cockatoo Reef (in the old workings on the 
top of the spur), the reef is from 4 feet to 6 feet wide, and dips about 
35 0 to the west. Its strike is N. 3 0 W. The strata dip 70° to the east. 
In the tunnel workings, almost immediately beneath, as shown on the 
plan and section, the reef apparently dips to the east, and the strata 
are almost vertical. 
Hidden Treasure Mine. 
This claim, which is situated immediately to the north of the Star of 
the East, on Mount Misery Creek, has only been worked to ,a very limited 
extent. 
A shaft was sunk to 49 feet, and a cross-cut driven 18 feet east. From 
it, I am informed, a crushing of 10 tons yielded 14 dwts. of free gold. 
At this stage the workings became^ flooded, and operations ceased. 
[Report sent in 23.9.05.] 
BORING SITES, MOUNTS BUNINYONG AND WARRENHEIP. 
By W. Baragwanath , Junior. 
Basalt from Mounts Buninyong and Warrenheip, and an intermediate 
point of eruption, known locally as Green Hill or Mount Helen, covers 
the greater portion of the country between Mounts Buninyong and Warren¬ 
heip, but strips of Ordovician strata border the flow to the east of Mount 
Helen. Absolutely nothing has been done to prove if there are deep 
leads, but the Mount Helen basalt takes a general easterly course between 
Ordovician strata, of about the same present level. If, as suggested by 
Mr. Hunter, a line of bores were put down along the road near. 
Navigators Railway Station, the existence of any lead from the west 
(which would be cutting across the general trend of the strata) would be 
proved within narrow limits. Should such work prove successful, further 
extensive boring would have to be done, as the basalt extends for 8 or 
10 miles in an easterly direction. 
Another point which cannot be settled from surface, indications is 
the position of the head of the lead (if any) under this narrow strip of 
basalt. The present watershed being of volcanic origin gives no clue. 
To the north of Mount Warrenheip a number of craters and points of 
eruption entirely obscure any features that would serve to indicate a likely 
position for boring for a lead. 
