bo 
Le 
~I 
PROCEEDINGS OF SECTION C. 
5.—SOME AURIFEROUS DEPOSITS. 
By Henry C. JENKINS, A.R.S.M. 
[ Abstract. | 
The author has lately been inspecting some deposits known 
locally as “sandstone reefs,” and occurring both at Greytown 
and at Heathcote, Victoria. The deposits are interbedded sand- 
stones, and are auriferous, but although they are in localities 
where considerable disturbance has taken place subsequent to the 
criginal folding, their continuity is not broken, nor are lodes 
formed in them. The gold is in “shoots,” and the hardness of 
the beds themselves varies from that of a sandy clay up to that of 
quartzites. The beds show traces of water action, and the shoots 
of gold appear to follow the lines where this action is greatest, as 
where the decomposition and staining of the rock is most marked, 
and where patches of “ dice holes” occur, the last probably repre- 
senting vanished iron pyrites. Gold does not appear to occur 
in any appreciable quantity in the harder parts of the beds. The 
metal also occurs in quartz reefs at Greytown, where the more 
detailed examination was made. It was evidently precipitated 
from solution into the “sandstone reefs,’ and the possibility is 
advanced that alluvial gold arises not only from lode degradation, 
but also from deposits formed at the surface by the agency of 
springs, with a deep-seated source, and containing gold in solu- 
tion, the decomposed “reefs” under notice being the track of 
such a spring. It is to be noted that the “sandstone reefs” 
occur in both places near valleys that have yielded very coarse 
alluvial gold or nuggets. 
6—THE RATE OF EROSION OF SOME VICTORIAN RIVER 
VALLEYS. 
By C. C. BritrLEBANK. 
Published in the “ Geological Magazine,” 1900.) 
7.—FURTHER NOTES ON THE ROCKS OF SOUTH- 
WESTERN VICTORIA. 
By J. Dennant, F.G.S., F.C.S. 
(Published in Proceedings of the Royal Society of Victoria, N.S., 
Vol. XIV.) 
P 2 
