276 
THE TAMLEUGH QUARTZ-REEF AND THE BASALT AREA, 
NEAR EUROA. 
By E. J . Dunn, F.G.S., late Director, Geological Survey. 
At about io miles north of Euroa in allotment 37 a, section 34, parish 
of Tamleugh, this quartz reef has been opened up. The country rock 
consists of Silurian sandstones and slates of grey colour. The workings 
comprise a shaft sunk to a depth of 60 feet some years ago, and (50 feet 
further north) an opening about 20 feet long, 15 feet wide, and 35 feet 
deep that contracts in depth. It is in this opening that work is being 
done. The strike of the beds is W. 5 0 S. ; dip 75 0 N. The 
irregular quartz vein that carries a little gold strikes W. 12 0 N., and 
dips 66° S., or across the bedding. The thick sandstone bed on 
the south side of this small quartz vein is crossed by spurs of quartz in 
which a little gold is reported to occur. At 20 feet from the surface 
a cross-cut has been driven south for about 70 feet, and two or three 
small spurs, reported to have carried a little gold, were cut. In the 
samples of quartz shown me there was a little gold of excellent quality, 
but there does not appear to be much gold present. From all the work 
done at this site it appears that only a few ounces were obtained. Judging 
from the specimens shown the gold is of high quality, and it is reported to 
have sold for ^4 3s. per ounce. 
In the present workings the best plan would be to sink another 
10 feet and drive east and west along the small vein of quartz that is 
said to give the best results. This occurrence is interesting, and resembles 
gold occurrences near Kilmore. 
The low ridges of Silurian country are said to extend from this spot 
for 5 miles in a westerly direction, for 15 miles northerly, and 6 miles in 
an easterly direction. Gold in small quantities has been found at other 
points over this area, and the country offers some encouragement to 
prospectors as it is easily prospected. So far as the Tamleugh workings 
are concerned, unless a little further work showed much improvertient, it 
is not worth spending much money upon. 
About 9 miles southwards from Euroa there is an area of basalt and 
scoria cones overlying the surrounding granitic rocks, and marking the 
site of volcanic activity in Tertiary times. The largest cone is known 
as the Blackfellow’s Head, and there are six or seven smaller cones within 
an area of 3 or 4 square miles. The largest development is at the old 
Pre-Emptive Right. Some of the cones are very diminutive, and the 
volcanic material from them covers only a few acres of surface. There 
is a considerable variety of rocks ranging from very dense to highly 
vesicular basalts, and tuffs also occur. The most northern portion of this 
volcanic area is within 3 miles of Euroa. This region appears to have 
been on the fringe of the extensive area of volcanic action, separated 
from the hundreds of square miles of basalt of Tertiary age in the Western 
District. 
Ito. 7 . 09 .] 
