io8 
EDWARD S. SIMPSON, B.E., F.C..S. : 
Some years ago two small samples of concentrates were 
brought to Perth which were said to have been washed out 
of the bed of one of the tributaries of the Donnelly River. 
This sand was composed largely of cassiterite and monazite, 
but in addition carried : — 
Sample. 
Platinum, per ton 
Osmiridium, per ton 
Gold 
A 
244-35 ozs. 
30.20 ozs. 
18.47 ozs. 
B 
291.05 OZS. 
54.90 OZS. 
34.65 ozs. 
There is some doubt as to the exact origin of these samples, 
which may possibly have come from N.S.W. 
The author has at times looked for platinum in various 
ores and black sands from localities in which highly basic 
rocks are known to exist and from other likely localities 
such as Kalgoorlie, Cossack, Kundip, and Golden Valley 
Although the method employed (Mingaye’s) should serve 
to detect, on the charges of ores taken, amounts as small as 
4 grains to the ton, none of this metal has yet been re- 
cognised in any of these ores. 
