>) Ae 
ti oy) 
Paya 
370 E. F. PITTMAN. 
colour bronze tarnishing blue. Rather brittle, but some pieces 
almost sectile in places. 8.G. 4°34, H. about three. Associated 
minerals dyscrasite and pyrargyrite. Lode-gangue siderite and 
calcite. 
Stromeyertte—Sulphide of silver and copper (Ag,S. Cu,8.)— 
The principal ore of the mine and the most uninteresting miner- 
alogically. Never crystalline, but very uniform in appearance, 
and fairly consistent in silver value, viz., about thirty per cent. 
Colour bluish- and greenish-black to black. Tough ; often anti- 
monial. So common in the past that no special tests were made 
of it. Depth (where it occurred in large quantities) one hundred 
to one hundred and forty feet (vertical); associated minerals 
principally azurite, malachite, volgerite and galena. Lode-gangue 
limonite and rarely siderite. 
Argentiferous Tetrahedrite.—Sulphide of copper and antimony. 
This and stromeyerite are the only silver ores found in quantity 
(excepting the antimonial chloride mentioned later). The others 
are so rare as to be considered curiosities. The bulk of this ore 
contained about twenty per cent. of silver, though small deposits 
have been found at various parts of the mine giving about thirteen 
and a-half per cent. At our deepest level however some of this 
class of ore has been found containing the same amount as the 
bulk, viz., twenty per cent. Large quantities have been found in 
siderite, but the richest and largest masses have always been found 
enclosed in calcite. The rich varieties have a lighter colour and 
brighter lustre than the poorer kinds. An isolated imperfect 
tetrahedron was found, but this was the only appearance of 
crystalline form observed up to the present. Depth, various, 
Associated minerals galena, pyrargyrite, chalcopyrite, bournonite 
and dyscrasite. Lode-gangue siderite and calcite. 
Brongniardite—Sulphide of lead, silver and antimony (PbS, 
Ag,S.Sb,8,).—Very rare; only met with associated with the upper — 
portion of a large deposit of stromeyerite. Gave very distinctive 
reactions before the blowpipe, but contained a large quantity of 
silver—thirty-four and a-half per cent. Encrusted with a grey 
