Mining Operations in the East Ovoca District. 225 
NOTE ADDED IN THE PREss. 
The following analysis of “ Kilmacooite,” or Blue Stone, will show the 
general composition of this interesting mineral :— 
—— A B | C D | E 
Lead, . P « |15:90* | 15:52 | + 7-60] 15-42°| 26-10 
Copper, . : .| 358 | 2:77| 317] 0-20] 00-55 
Iron, : é 16:45 4:40 | 27-40 2°50 | 11°56 
Antimony, . ° a) O10 - - ~ - 
Arsenic, . - a Os - - - - 
Zine, . - - | 26:18 24-00 8:16 | 49:08 | 20-00 
Sulphur, . - | 32°65 20°18 | 37:12 | 28°56 | 24:60 
Silica, ; 7 -| 0°82 30:90 | 12-00 2°50 | 16°70 
Earthy Matrix, . -| 3°65 - - - ~ 
Oxygen, . : -| 0-50 = = = = 
Gold, C 5 -| O-00L a o — | Trace 
Silver, : . -| 0:012 - ~ | 740z. | 6 oz. 
Loss, ° 4 & || UE ~ - - = 
Ore from Pary’s mountain Mine. 
Ore from Madam Butler's lode, Cronebane. 
Ore from main lode at Butts shaft, Se 
Ore from south lode at Old Whim shaft, ,, 
Ore from Kilmacoo lode (Connary mine), 
HOOD 
The iron pyrites in the main lode at the Magpie mine contains more 
or less lead, and in places zinc, and so graduates into ‘“ Kilmacooite.” 
C is an analysis of iron pyrites changing into Kilmacooite. 
The Chalcopyrite found in the Eastern Ovoca mines contain froin 8 
to 12 per cent. of copper. 
The iron pyrites contain from 33 to 36 per cent. of sulphur. About 
one-sixth of the pyrites is cupreous, and contains 38 per cent. sulphur 
and 21 per cent. copper. Nearly all the pyrites contains gold, silver, 
nickel, and cobalt, in small quantities. 
B, C, D, and E were not tested for antimony or arsenic ; they, how- 
ever, are probably present in B, D, and E. 
B and C were not tested for silver or gold. 
