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TIN DEPOSITS OF NEW SOUTH WALES, 99 
stone occur. The granite throughout this area carries a large 
proportion of white mica, but in these offshoots or arms the rock 
often passes into a true greisen so thickly impregnated _ tin- 
stone that a block less than 1 foot cube often weighs more than 
1 ecwi., and tinstone can be seen quite thickly speckled yee 
the ro lk. 
Throughout these impregnated areas numerous small veins 
occur in which the cassiterite has crystallized out, and in some 
cases these veins have well-defined walls for a short distance, in 
. others the crystals of tinstone penetrate into the walls of the 
cavity ; but in either case they are doubtless veins of segregation, 
the tinstone in which has been directly derived from the surround- 
ing count 
"The deposits of the Gulf mines and the Giant’s Den, near 
Bendemeer, are reported to be similar in character, and, judging 
from the general descriptions of them which I have been able to 
gather, there can be little doubt that such is the case since the tin 
seems to be very widely distributed, and, in the samples I have 
ppears generally to be isseminated through the rock. 
The same remarks will apply equally well to the new discoveries 
on the sooth reserve 6 miles from Tenterfield. 
eighbourhood of Tingha several attempts have been 
made fois time to time to work some of these irregular deposits, 
and although at ae is time the Bischoff mine, at Stannifer, is the only 
one in which work is being carried on—-and even this is under- 
stood to be on the eve of suspending operations—some description 
of the deposits will be of interest, more especially ee some 
very sah patches of ore have sti: found from time to 
rst claim worked was the Bolitho mine, pct a leader 
only a alee inches wide on the surface was traced for a consider- 
able distance along a north-east course, and was also sunk and 
There would appear to have been several patches of ore raised 
_ from this mine ; but work was eventually suspended owing to the 
stone running poor; but even now there seems to be sufficient 
inducement to further prospect the claim, although, shatt 
being full of water, it is impossible to examine the old w 
The country rock, which is granite, is traversed by a erik 
network of veins of quartz carrying. tinstone in greater or less 
fair om rk. 
tin patio of Tingha belong chiefly to these “ stockworks,” 
for the Buchart mine, which lies about 2 miles north of the 
township, is another illustration of this class of deposit. In this 
