264 Scientific Intelligence. 
any former period. The fact of the general similarity of the modes 
of occurrence of gold in gulches, deep lying placers, and in old river 
a 
and é 
called—in Victoria. This want Mr. Smyth fully supplies. He 
Z. 
riferous, is over 2,600, and the total extent in square miles of 
auriferous alluvial and quartz ground worked upon is upwards of 
0 square miles. 
The average yield of gold from certain parcels of quartz, the de- 
tails of which are given from 1859 to 1868, from returns made to 
the Mining Surveyor and Registrars, is shown to be from 5,816,669 
tons 9 cwts. of quartz crushed, 3,346,201 oz. 8 dwts. of gold or 
an average, per ton of 11 dwts. 12°37 grains, This value is very 
unequally distributed between the different districts, as appeats 
1 endi 
: 3 a 
quired by these stamps, or 921,600 gallons per diem. ‘Two steam 
engines drive the stamps. Of the total gold saved, 66°08 per cent 
are found in the stamp beds, 22-95 in the mercury-boxes, and 10°97 
Tt 
ley, California, yielded $5375 
of $27.80 per ton of ore; an see os con- 
verage of some former years. a 
