48 
lion of an auriferous lode. The matrix is a gossan composed of iron 
hydrates, quartz, and clay. No sulphides were visible in the first 
shaft, but they were expected to be reached at a depth of about 140 
feet. In the 103ft. and 112ft. levels and elsewhere a number of 
samples were taken of the soft, kaolmised rocks, which dipped at a 
high angle, and were dark reddish brown to white in colour. These 
were found to yield sulphuric oxide in small proportions from traces 
upwards. This lias been found to be characteristic of the larger pro- 
portion of all rocks in the Phillips River Goldfield which have re- 
cently been tested. In this connection it is to be noted that several 
sulphides, chiefly pyrite, pyrrhotite, and chelcopyrite are widely 
distributed in large quantities throughout the district below the zone 
of oxidation. 
A considerable quantity of a similar basic sulphate was found 
in a sample of the weathered greenstone schist carrying streaks of 
a yellow ochreous material from a depth of 60ft. in a new shaft on 
the Coronia Lease in Sutherland’s Gully in the Ravensthorpe Range, 
near Kundip, as well as in a cliff on the Jerdacuttup River. Finally 
on testing the ironstone used as a flux at the State Smelter and 
quarried in the Ravensthorpe Range at Iron Knob, 0.30 per cent. 
SO., was found in poor specimens containing 62 per cent. Fe,0.. and 
10 per cent. SiO,, and 0.52 per cent. SO, in picked specimens 
containing 75 per cent. Fe,0, and 3 per cent. SiO,. This ironstone 
represents possibly the outcrop of a large lode in which pyrites, 
pyrrhotite, and magnetite are abundant below water level. A similar 
lode, outcropping at Mt. McMahon, 2% miles to the North-West, 
was pierced by a bore at some depth below the zone of oxidation, } 
and portions of the core on analysis gave: — 
Table II. 
Sulphide Lode, Mt. McMahon, Ravensthorpe. 
Fe 
(a) 
44-37 % 
GO 
« ib 
Cu 
•03 
•02 
Ni 
■06 
trace 
Sb 
•02 
•01 
S 
35-91 
30-70 
SiO., 
1470 
933 
A 1,6, 
trace 
trace 
MnO 
•97 
1 55 
CaO 
•72 
1 53 
MgO 
3-73 
410 
O etc. 
traces 
(7-08) 
100 51 
100-00 
The chief metallic constituents of A were pyrrhotite, and pyrites 
with traces of magnetite; of B, pyrites, pyrrhotite, and magnetite in 
