231 
Notes on some New South Wales Silver and 
other Minerals. 
By A. Liversiper, F.R.S., Professor of Chemistry and Miner- 
alogy in the University of Sydney. 
[Read before the Royal Society of N.S.W., 1st December, 1886.] 
f “ 
Most of the silver minerals placed before you and mentioned in 
the following notes were collected by Mr. J. M. Smith, a member 
of this society, and many of the assays were also made by him. 
Native Silver.—The specimen of native silver placed before you 
is from the Umberumberka ine, about 14 miles from 
Silverton, and was obtained at a depth of about 240 feet, where 
the vein is about 4 feet wide. It is in the form of thin scales, 
and is associated with galena and siderite, the layers or scales of 
various depths in the different mines. The loose masses found on 
the surface have usually a dirty green or: brownish colour, and are 
wn by the miners as “slugs” ; on cutting them or driving into 
them with a pick they present the usual characteristics of masses 
of silver chloride, being very tough and horn-like, and yielding a 
smooth shining surface, and, if the knife be wet, a metallic silver 
surface. They sometimes weigh many pounds, but are usually 
much less. 
One specimen which was examined yielded the following result 
to Mr. Smith :-— 
Sample from 212 feet level, Broken Hill Mine, Barrier Range :— 
Chloride of silver... ss nine ae 
Bromide of silver... ie pT id 
8-14 
100-00 
The vein stuff is sometimes earthy, at others it consists, largely 
of chlorite, and in other instances it contains bluish chalcedonic 
translucent quartz ; at times it is mainly ferruginous. 
