260 
ORES FROM NEW SOUTH WALES. 
Nov., 1891. 
of the rock. In one mine—the “ Umberumberka Silver-lead 
Mine ”—the lode is described as a true fissure vein, cutting 
the “ bedding ” of the schists, the ore not seeming to be 
more plentiful where cutting any particular variety. The 
ore is worked on the upper or hanging wall of the lode, and 
varies from a few inches to ten feet in thickness ; it consists 
of a considerable variety of lead minerals—sulphide, car¬ 
bonate, sulphate—with occasional specimens of chloride of 
silver and the native metal. 
Another mine, “ The Broken Hill Proprietary Company,” 
raises chloride, bromide, and iodide of silver, with car¬ 
bonate of lead, all highly ferruginous. Indeed, this appears 
a regular silicious sinter, with much iron and smaller quan¬ 
tities of the precious metal. Some of the specimens exhibited 
in London in 1886 assayed up to 1,460 ounces of silver per 
ton. This has a very large look, which we scarcely recognise 
in the shape of 3J per cent, of the ore of iodide of silver and 
3f of chloride. 
The Barrier Ranges Silver Mining Association showed a 
specimen of “ Oxide of iron in mica schist, with chloride of 
silver from the Apollyon Silver Mine,” assaying 2,286 ounces 
of silver per ton of ore. The ore was here about 2 feet thick 
in a 3 feet lode. 
Occasional masses may of course be much richer, the 
chloride and bromide of silver being present in masses of 
considerable size. These masses are called slugs, and may 
be almost pure chloride of silver: two analyses gave respec¬ 
tively (Mining Reports and Professor Liversedge on the 
Minerals of New South Wales) 72*23 and 81*67 per cent., the 
latter also containing 10*19 per cent, of bromide of 
silver. Many of the ores also contain a very minute quantity 
of gold. 
It is interesting to note that the same group of minerals 
recurs in some of the very rich mining districts of the United 
States. 
Galena is, of course, very widely distributed, but the asso¬ 
ciation with cerussite is characteristic of the wonderful 
Leadville (Colorado) Mines, where “ carbonates,” either hard 
or soft, are the most coveted ores. These frequently occur 
in the carbonate, the sulphate, and phosphate, but not in 
conspicuous quantities. As far as I have been able to test 
(by the blow-pipe) the specimen of cerussite which I have on 
the table, there is not much silver contained in it, but no 
doubt this varies from place to place. Liversedge mentions 
