Nov., 1891. 
ORES FROM NEW SOUTH WALES. 
261 
a specimen 56'96 of carbonate of lead and O’8 of iodide 
of silver. Carbonate Camp, in Lawrence County, Dakota, 
takes its name from the same mineral, and it is found in 
Idaho and Montana. 
The chloride of silver (horn silver) is a soft, very easily 
fusible substance, which occurs mixed in very varying pro¬ 
portions with chloride of lead in many of the American 
mines, notably (and in this case it is almost pure chloride of 
silver) in the great Comstock Lode in Nevada, two of the 
mines on which were in 1875 and 1876 each paying dividends 
of 200,000 dollars a month, fully accounting for the great 
Bonanza Kings of the States. 
At Leadville it occurs in small quantities, impregnating a 
rhyolitic rock, and it is in this locality that the most search¬ 
ing investigations have been made as to the origin of the 
precious ore. Very accurate analysis has shown that the 
minerals of the rock, where it is unaltered, contain minute 
quantities of silver; this is notably the case with the augite. 
It is further found that in the neighbourhood of the lodes the 
rock is much decomposed and has lost its silver, and the con¬ 
clusion is arrived at that this has gone to fill up the fissure, 
and so form the mass of ore. 
At Leadville also occurs the embolite or chlorobromide of 
silver and chiefly in a silicious iron ore in cavities and on 
fissure planes. Now the chlorobromide of silver from 
Broken Hills occurs in just the same conjunction, as you 
may see from the specimens before you, and its presence in a 
mass of kaolin, from which it is easily separated by washing, 
is a proof of much rock change in its vicinity. 
The galena from the Pinnacles Tribute Silver Mining 
Company gave but a very small bead of silver in a blow-pipe 
test; but there, again, mine may be a sample of one of the 
poorer parts of the lode, as I see that the average lode 
stuff exhibited at the Colonial Exhibition assayed 78oz. 
per ton. 
In one or two of the specimens there are clear indications 
of copper, and small quantities were evident in the course of 
the blow-pipe testing. 
In 1886 smelting works were erected, and it is simply a 
question of the cost of fuel whether it will pay to reduce the 
ores at the mines. The fuel required is coke, and although I 
have no knowledge of the price of this at Silver ton. I find 
