68 
Mines and Mineral Statistics. 
]\[r. "Wesley’s apparatus, a drawing of which is annexed, con- 
sists of a horse engine and rope belting, which works a Califor- 
nian pump, 18 feet long and 9 inches by 3 inches; the vertical 
height of water raised l)eing 11 feet. On the same shaft which 
works the pump is a wheel and belt, whicii works a cjdindrical 
sieve 1 foot S inches in diameter by 3 feet long, made witli bars 
of iron - 3 - inch square placed longitudinally, and a space between 
each bar of 1 incli, so that any stones or lumps over \ iuch 
diameter cannot go between the bars, and consequently do not 
])ass into the sluice box. 
On each end of this sieve flanges are riveted at the receiving 
end of tlio sieve ; this flange is to prevent the dirt from dropjnng 
out undcriiealh the hop[)er into wliich the wash dirt is shovelled 
and prevent its falling into the sluice box. The flange at the dis- 
charging end is to prevent the stones from escaping too quickly, 
so that they liave a better chance of being washed clean, and also 
tends to sto]) all the water that miglit otherwise run longitudinally 
o\ur tlie sieve and go away with the stones or pebbles, carrying 
some loose tin with it. 
This cylindneal sieve is fixed over the head of the sliiice-hox, 
and set at an angle of 3 inches in its whole length, to facilitate 
its discharging the stones or pebbles, wliich arc washed clean in a 
few revolutions. At the back of this sieve the water is conveyed 
by launders from the pump to tlie hopjier or receptacle for 
feeding. The staiiriifcrous dirt is thrown into this receptacle, 
through wliich three-fourths of the water used for sluicing jjasses, 
and carries tlie wash-dirt into the sicA'e. OuP-fourth of the 
water is conveyed through pipes or tubes from the launder to bear 
direct against the pebbles revolving against the streams of water 
with the revolution of the sieve, consequently these streams of 
water falling on these pebbles whilst in motion allow every chance 
to wash off all the loose tin. The pebbles pass through the sieve 
ami fall into a bin with a slojiing bottom, to which a trap-door is 
iixe<l worked with a lever, under which a truck (3 feet (J inches x 
3 feet 0 indies x 1 foot 0 inches) is placed and a tramway is laid. 
The ' trap-door being raised the pebbles fall into tliis truck, 
Avhieh is removed by a horse a distance of 100 yards, and tlicrc 
discliarged to hll np old worked ground. The line stanniferous 
sand and gravel fall through the sieve into the sluice box (IS feet 
long, 3 feet wide at head, by 1 foot (J inches at tail) on which two 
nnni using square-inoufhed shovels wash the dirt, in a similar 
manner to the old way of slnieing with forks. The refuse or 
tailings from the sluice-box fall into a*lnitch (see drawing), under 
which a truck road is laid, and the truck (of the same dimensions 
as the one given above for pebbles) goes underneath this liutch, 
in the bottom of which are three valves or slides 1 - inches x 1 
inches, worked by a lever, which wheu opeued, the pressure of 
