115 
THE UNION AND DORRITT MINE, GRANT, NORTHERN 
GIPPSLAND. 
(no. i6 on locality map.) 
By E. J. Dunn , F.G.S., Director , Geological Survey . 
This mine is about J mile northerly from Grant. The country-rocks 
consist principally of hard grev Silurian sandstones, with some slaty beds. 
The strike of the Dorritt reef is W. 20 deg. N., and it dips 65 deg. 
N.E. The reef, about 5 feet wide, occurs in a shallow shaft to the 
westward of the Dorritt adit. About 3 chains southward from the 
Dorritt reef is the Union reef, which is over 6 feet wide in places. 
These two reefs traverse the whole length of the leases held by this com¬ 
pany. In a small hole, 2 chains west of the Dorritt tunnel, the reef 
is 4 feet thick. In the upper tunnel the sandstone is of purple colour. 
The reef is 1 to 4 feet thick. This tunnel has been driven 9 
chains in from the north to where the stopes commence. They rise to 
the surface. Stopes have been taken out 70 feet below the level of the 
adit for a length of 300 feet along the Dorritt reef. Near the mouth of 
the adit (about 2 chains in) a dyke crosses the reef diagonally; it is in 
a decomposed state. 
The Italian reef strikes off from the stoped portion of the reef in a 
direction W. 35 deg. S. ; its dip is 80 deg. S.E. The reef is 6 to 
12 inches thick, between well marked, smooth walls of hard grey sand¬ 
stone. This reef was very profitable to work. The Italian reef runs 
towards the Dorritt reef on the northern side, but does not appear to have 
actually joined it. The shoot of gold in the Dorritt reef pitches E. 
20 deg. S. at an angle of about 70 deg. The strike of the country-rock 
is about S.E. 
The Union reef was also worked along a shoot for some distance, and 
further eastward was worked from the Union adit. The eastern end of 
this reef on the side of the hill has evidently broken away from its 
original course. 
The Union tunnel is between 1,000 and 2,000 feet above Good Luck 
Creek. This creek was worked for alluvial gold. The strike of the reef 
in the Union adit is W. 20 deg. N. and the dip is 65 deg. northward, 
and the quartz is from 1 to 2 feet thick. The reef has not been worked 
below the adit floor. The length of the Union tunnel (cross-cut) to the 
reef is about 250 feet. Both the Union and Dorritt reefs have been 
worked for 170 feet in depth from the surface at the eastern end of the 
lease. 
A low-level tunnel is now being driven to cut the reefs at a depth of 
300 feet below the Dorritt adit, or 230 feet below the bottom of the stopes 
carried below the tunnel level. This low-level adit has been driven in 
690 feet; there are still 250 feet to be driven before the Dorritt reef can 
be cut. The dip of the reef is away from the direction of the tunnel 
mouth. 
This lower tunnel has crossed through the course of the Vulcan reef, 
which gave some good crushings, and which is about 200 feet to the south 
df the Rubbly reef, or 400 feet to the south of the Dorritt reef. A dyke 
occurs along the course of the Vulcan reef in the level along that reef 
from the adit. The Rubblv reef has also been worked at the surface for 
some distance, but it does not yet appear to have been cut in the adit. 
In the Vulcan reef the quartz is 6 to 12 inches thick. Its strike is W. 
