108 TIN DEPOSITS OF NEW SOUTH WALES. 
_We may conclude, however, that where deposits of any size 
exist, even in places which are not easily = a yield of 5 
per cent. of black tin would be a payable retu 
As regards the alluvial deposits, reference =i ee be made 
to the deep leads, and in these from 1 ewt. to } ewt. per load of 
27 cubic feet is considered payable, the valuable lead in Bailey’s 
mine, which has already been fully described, being payable at } 
of 
ewt. to the load, with 133 feet of sinking. In shallow ground 
course much smaller returns will pay. 
Mernops or TREATMENT. 
As regards the methods of treatment smaplorey considerable 
improvements have been made of late years. The original shallow 
leads were worked very imperfectly by sluicing, and that much of 
the tin was lost is shown by the fact that the old * burrows” are 
often reworked by Chinamen; but the sluicing appliances now 
used are far more perfect, and, son the introduction of under 
los 
thoroughly demead by this process. 
Where crushing is resorted to in the lodes, &c., buddles and 
slime-tables are principally used, and the final operations of tossing 
and packing are employed, as in Cornwall. At Butler's lode ‘four 
convex buddles and a self-acting slime-table are employed, and 
very little tin appears to be lost, as next to nothing could be 
obtained from the tailings with a vanning shovel. 
At the Tent Hill works, which probably — the most perfect 
plant in the Colony, the crushed ore is firs + passed hee 
ettinger’s separators, and from there is —o to two pairs 0 
Petherick’s separators, which are in principle the same as pare 
jiggers, and from the last pair of these the finer material goes to 
a side-blow percussion frame. A rotating slime-table is also 
ws ws and the tailings are finally run over convex buddles. ; 
a 
ae 
viz, mage: per ton, and at Tingha, si which aie the ae 
the tin is sent to Sydney, the price has remained steady at 55: 
ton. 
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