‘259 
of this appears to have been free gold but the rest was in the sulphides. 
The amount assayed was too small for this result to be taken as anything 
more than an indication that some of the sulphides are auriferous: it by 
no means proves that the concentrates as a whole contain 5 oz. of gold per 
ton. 
[22.7.09.] 
WOLFRAM DEPOSITS NEAR MARYSVILLE. 
By E. J. Dunn , F.iG.S., late Director , Geological Survey. 
About 5 miles in a direction E. 20° S. from Marysville is Mr. 
Rvall’s camp. The country rock at Marysville is Silurian slates and 
sandstones, but at ij miles east it consists of about one mile of dacite (?) 
(along the dray-road); then granodiorite extends over the whole area 
where wolfram is being worked. Mr. Ryall’s workings are just below 
his camp on a point between the junction of a small creek running in 
from the east and joining Opas Creek. These creeks flow into the Yarra. 
The small creek has been worked for alluvial wolfram for about 4 chains 
above its junction with Opas Creek, and Opas Creek has been worked for 
alluvial wolfram for 5 chains below the junction and for 3 chains above 
it. Tn Opas Creek a width of about half-a-chain was taken along the 
creek course and the depth of alluvial material ranged from 3 to 6 feet. 
There is a considerable proportion of quartz in the wash-dirt, and still 
more abundant is a breccia of quartzite and fibrous tourmaline. This 
breccia is said to occur as a broad belt about one mile higher up on the 
watershed- The wolfram is nearly all fine-grained and from the area 
sluiced about 1 ton of wolfram has been obtained. The bottom is de¬ 
composed granodiorite. 
A chain below the hut a lode has been opened up. The strike is N. 
15 0 W., and it is nearly vertical. It is from 3 to 6 inches thick, and 
consists of quartz with wolfram and iron pyrites disseminated through 
it, but sparsely. The lode crosses both creeks and has probably supplied 
much of tire alluvial wolfram. The richest part opened up is where it 
crosses the small creek, and here a hole should be sunk upon it, for it 
is likely that much of the wolfram near the surface has been leached 
out. 
Probably 30 or 40 feet would reach unaltered granodiorite, and the 
lode would be disclosed in its unaltered state. 
Reddin’s Claim. 
This claim is situate about 1 mile lower down Opas Creek than Mr. 
Ryall’s in an easterly direction, and on the east side of the creek. The 
rock is granodiorite in a decomposed state, seamed with quartz veins 
from 1 foot thick to mere threads. The strike of the principal quartz 
veins is Y. 15 0 S., dip about vertical. The quartz is glassy, and 
particles and pieces of wolfram are disseminated sparsely through it. 
Iron pyrites is also present. In some of the veins brown tourmaline of 
fibrous character is abundant. Besides the well-defined quartz veins. 
