33 
THE SEDGWICK GOLD MINE, SEDGWICK, NEAR 
RAVENSWOOD. 
By E. /. Dunn , F.G.S., Director , Geological Survey. 
The Sedgwick mine is situated about 3 miles easterly from Sedgwick 
Post-office. The main shaft is on the south side of a gully and 4 chains 
south of the shaft a saddle reef is exposed in a shallow shaft. The country 
rocks are seen dipping away to the east on the east side and to the west on 
the west side of the saddle reef. Below the saddle reef is black shale. Sand¬ 
stones and slates of grey and brownish colour form the containing rocks. 
On the north side of the gully centre-country is exposed in an open cutting 
and below this a quartz reef was worked by means of a tunnel. The quartz 
was about 3 feer wide and it yielded 4 dwts. of gold per ton. The gold at 
this mine is worth ^3 17s. 3d. per oz. About 27 feet east of the mass of 
quartz worked by the tunnel along centre-country Is a reef that conforms 
with the containing beds, and dips easterly—a leg reef. The quartz is 
15 feet thick, but only traces of gold occur in it. 
The whip shaft is 720 feet north of the main shaft and 230 feet deep. 
An irregular reef 2 feet thick occurs. At 30 feet down, this reef was cut 
60 feet east of the shaft; it dips west and cuts the shaft again at 140 feet 
from the surface. It is reported to be 4 feet thick by the manager, Mr. 
Ellis, and to contain about 3 dwts. of gold per ton. On the top of the hill, 
between the whip shaft and the main shaft, a reef, which is 6 feet thick 
but not auriferous, and which has the same strike as the country, is exposed 
at the surface. 
Only two auriferous gullies have been worked in this neighbourhood; 
one runs down from the main shaft eastward, and another short gully lies 
about 1 A- miles further south. 
About 400 feet north of the whip shaft a little work has been done on 
a reef at centre-country. It dips west and is apparently a west leg; it 
has been followed down for 98 feet. 
At the surface, the strike of the centre-country or anticline is N. 15 
deg. W. In the 300-ft. level there is a cross-cut east for 212 feet. At 48 
feet east of shaft there is a level driven south for 293 feet and north for 
460 feet. This is along a “ back ” that has been stoped for 107 feet above 
the level. The quartz, which formed a leg reef, was> about 12 inches thick 
and was stoped for 100 feet below the north level. At the end of the north 
level the quartz is 3 inches thick. A cross-cut is driven west from the north 
end of this level for 200 feet. In the 500-ft. level, centre-country is about 
20 feet east of the main shaft. At 70 feet east of the shaft a level is 
driven north for 180 feet. 
At 100 feet in on the east cross-cut a fault is exposed that dips west, 
and this fault crosses the shaft just above the 600-ft. level. From the 
cross-cut a level is driven northward on a “ back ” that dips east. The 
pitch is northward about 7 deg. About 136 feet north of the cross-cut there 
is a quartz reef 6 feet thick conforming with the strike and dip of the 
country. It is said to carry about 3 dwts. of gold per ton. 
At the 600-ft. level and 40 feet east of the shaft is centre-country, and 
a level is driven along it for 193 feet northerly. A quartz reef 2 ft. 6 in. 
thick has been worked along this level. At the north end only a little 
quartz is showing, and the reef may be pitching away in that direction. 
The quartz continues overhead 136 feet up* to No. 5 level. One hundred 
and twenty-six feet east from the shaft is a “ back ” that strikes with the 
country and dips east, and a little quartz shows along this. 
