112 
Right opposite Rolfe's Flat on the opposite or southern side of the 
river and about ioo feet higher up the hillside the Cement lead is being 
worked by Morritt and Peterson. They skim off the bottom t, inches of 
the cemented gravel and obtain a nice sample of gold of great purity worth 
£4 2S - per oz. Most of the work now being done on the alluvial ground 
consists of searching for and working odd patches that have escaped the 
earlier miners, and it speaks well for the field that even now, after more 
than forty years’ work, the men so employed can earn a living. 
It seems highly probable that there are tributaries to the Tertiary 
leads vet to be discovered; also, that where breaks occur in these old 
leads, there is still gold to be obtained by searching for it. In the alluvial 
ground along the jTanjil River course, and some of its larger tributaries, 
there is probably still new ground that could be profitably worked. 
Between the spur from Baw Baw from which the Tanjil is fed and 
the ground already worked, is a belt some miles in width, in which alluvial 
and reef gold should be searched for. 
Although a neglected gold-field, Tanjil is by no means an exhausted 
one. 
[Report sent in 25th November, /905.] 
SOME GOLD REEFS AT ALEXANDRA. 
(no. 15 on locality map.) 
By E. J. Dunn, F.G.S., Director , Geological Survey. 
About \ mile S.W. from Alexandra is the site of both alluvial and 
quartz mining for gold. The country-rocks are Silurian sandstones and 
mudstones of drab and grey colours. The strike of the beds is about 
W. 40 deg. N. The beds are bent over into a series of anticlinal and 
synclinal folds. These folds are frequently repeated in some cases at 
very short intervals, as in the cutting leading in a north-westerly direction 
towards Alexandra Road railway station from Alexandra. 
Within the area recently taken up under leases there are two principal 
lines of reef—dipping to W.—about 500 feet apart, both of which con¬ 
form with the strike of the containing beds, showing that they are “legs.” 
The northern line is known as the Luckie line; the other as the Homeward 
Bound line. Between the two, at the north-western end of the workings, 
a third line, known as the Mysterious line, has been worked. 
Crossing the two main lines of reef are two diorite dykes, each of them 
being a few feet wide, but they vary considerably in thickness along their 
course. The northerly dvke strikes about E. 20 deg. S., and its dip is 
nearly vertical. The other dyke strikes E. 10 deg. S., so that they con¬ 
verge in an easterly direction. They approach closely to one another at 
No. 2 shaft, on the Luckie line. The northern dyke is said to be trace¬ 
able for many miles. It is noticeable that the old workings occur chiefly 
about the intersections of the dykes by the reefs, for the reefs have been 
formed subsequently to the dykes. In the present workings, it is these 
intersections that have to be followed up. The conditions under which 
the gold occurs are that diorite dvkes striking a little S. of E. have in¬ 
tersected corrugated Silurian beds of sandstone and mudstone nearly 
verticallv. The strike of the Silurian. rocks is nearly N.W., and in the 
