56 
assays will be completed shortly and these should give the value of the 
drifts, &c., close to the shafts. But with extensive drifts, clays, and gravel 
such as those occurring in this area, and where the cassiterite may be pay¬ 
able in some places and unpayable in others, it is necessary to put lines of 
bores down across the deposits to determine the varying depths to bedrock, 
and whether there are one or more false bottoms, and to enable an average 
value to be obtained by carefully sampling the bore cores. 
Report of the Mines Department Laboratory on samples 20 to 27— 
The eight samples consisted of quartz sand, with tourmaline and a little 
cassiterite. They were each washed down and the amount of concentrates 
recovered was weighed. This was then assayed for gold and tin. 
No. 
Concentrates 
Per cent, 
of 
Original. 
Gold. 
Tin. 
Per Ton, 
Concentrates. 
Per Ton, 
Original. 
Lbs. per ton 
Concentrates. 
Lbs. per to 
Original. 
20 
0.57 
trace 
trace 
lbs. 
1.32 
.0075 
21 
1.5 
2 oz. 2 dwt. 10 grs. 
0 oz. 0 dwt. 16 grs. 
4.03 
.0605 
22 
0.94 
trace 
B trace 
5.20 
.0493 
23 
1.75 
2 oz. 17 dwt. 11 grs. 
0 oz. 1 dwt. 5 grs. 
1.52 
.0268 
24 
1.34 
Nil 
Nil 
1.68 
.0224 
25 
1.44 
Nil 
Nil 
0.58 
.0075 
26 
0.97 
trace 
trace 
4.80 
.0469 
27 
3.27 
trace 
trace 
2.44 
.0786 
[Report sent in 18.1.07.'] 
THE CHILTERN VALLEY GOLD MINE, No. 2 SHAFT. AND THE 
GOLDEN BAR MINE, CHILTERN. 
By E. J. Dunn, F.G.S., Director, Geological Survey. 
The Chiltern Valley Gold Mine. 
No. 2 shaft of this mine reaches bedrock at 303 feet and its total depth 
is 363 feet. The levels extend for a length of 2J miles. The reef levels 
are driven from the bottom of the shaft and the wash dirt levels are 60 feet 
higher up. The whole of this mine is laid out in a systematic manner cn 
the plan of having the lower level for drainage, haulage of wash dirt, 
ventilation, &c., and the upper levels for escape ventilation and transport 
of timber. The manager, Mr. John Cock, was the first to introduce this 
method of working deep alluvial leads in this State. 
The alluvial deposit consists of about 2 or 3 feet of wash-dirt, in which 
moderately rounded quartz pebbles are embedded in granitic drift that is 
adhesive through the presence of a small proportion of clay. 
It is stated by Mr. Cock that the shaft was sunk through material that 
largely consisted of granitic detritus. The wash-dirt consists of quartz 
pebbles and boulders that range from 1 cwt. downwards but the great bulk 
of them run from 1 to 4 lbs. in weight; they represent the quartz veins 
that traversed the Ordovician slates and sandstones before they were 
denuded. All the softer material has been ground away; the present course 
