258 
PROCEEDINGS OP SECTION B. 
In regard to the prevailing character of the mineral compounds 
which have been encountered, it may be stated that the greater bulk 
was decidedly of a complex nature, containing a number of different 
base metal sulphides combined. 
As it would go beyond the limits of this paper to give the 
particulars of each individual ore which has been treated, the writer 
will confine himself to a few examples which have been selected as 
types for either a special district or a special mine. 
Charters Towers and Ravenswood undoubtedly produce the 
greatest quantity of massive sulphide ores amongst the Queensland 
goldfields, although, as a rule, a separation of the heavy mineralised 
portion from the ordinary crushing material is very rarely practised. 
About 8 tons of a massive sulphide ore, coming from the Day 
Dawn P.C. Company, Charters Towers, consisted of — 
Iron pyrites 
... ... 
57*9 
Galenite ... 
... ... 
11*5 
Zincblende 
♦ • • ... 
8*6 
Silica 

22*0 
100*0 
Assay, about 10 oz. gold per ton. 
Another mine, the New Towers Extended, produced a few years 
ago some 300 tons of a complex ore, consisting likewise of iron pyrites, 
zincblende, and some galenite, and averaged 3 "25 oz. of gold per ton. 
Its average composition was as follows : — 
Iron pyrites 
61*2 
Zincblende 
21*0 
Galenite ...* 
22 
Silica 
15*6 
100*0 
A smaller parcel of about 1 ton 18 cwt., from the New Imperial 
Mine, consisted mainly of iron and arseno-pyrites, with 45 per cent. 
SiO a , and assayed 8*4 oz. of gold per ton. 
At Ravenswood the principal source of a heavy mineral ore is 
the No. 1 South New England Gold Mine, which quite recently has 
produced over 150 tons, assaying from 2*5 oz. up to 5‘65 oz. of gold 
per ton, the general composition of which may be represented by the 
following analysis : — 
Iron pyrites 
Copper pyrites ... 
Zincblende 
Alumina ... 
Silica 
• • • 
... 34*3 
... 4*8 
... 19*1 
... 4*3 
... 37*5 
100*0 
Erom the Mount Ferry district the writer has dealt with 20 tons 
of a heavy mineral ore from the Lady Norman, and 41 tons from the 
Reid’s Creek Mine. The ore in both cases carried a little over 40 per 
cent, of mineral, principally iron and arseno-pyrites, with a little 
galenite and sulphide of antimony. The gold contents varied between 
2*25 oz. and 5*05 oz. per ton. 
