102 TIN DEPOSITS OF NEW SOUTH WALES. 
from those which carry the tin* and so, in view of the new appli- 
cations which it has lately received in steel manufacture, may be 
looked upon as a newsource of prospective wealth, instead of only 
an encumbrance. 
Copper pyrites is a common associate of tin, especially around 
Dolcoath, where some very rich samples occur, but generally only 
as small patches in the rock. In some veins arsenical iron pyrites 
occur in sine oti quantities, notably in the centres of the lodes, 
but it is also impregnated through the rock in greater or less 
apatite 8. 
Veins of fluorspar have been found, but they are st is fre- 
quent occurrence, and the deposits hitherto have been st 
ther minerals containing fluorine in their nbsecscrsteie aa as 
tourmaline and white mica, are of frequent occurrence ; and topaz 
is exceedingly common in the alluvial deposits, sometimes as fairly 
perfect crystals, one in the possession of Mr. D. Porter, at Tam- 
worth being of great size 
The association of bevy! with the tinstone of the Gulf mine is 
well known, but its occurrence deserves a passing mention here, 
since it is unusual to find beryl literally forming a rock, as in t this 
locality, with tinstone impregnated throug 
In the Inverell District, diamonds, Sopher zircons, &c., 
found associated with tinstone in alluvia, or perhaps it ‘would ta 
more correct to say that tinstone occurs in the diamantiferous 
deposits, for there is not sufficient tinstone present to pay for the 
extraction of that mineral alone, although it can be saved in the 
ocess of diamond-washing, and serves to partially defray the 
expenses of working 
The tinstone itself occurs in a variety of forms and of different 
colours. Even in the same mine we frequent y find pure white 
oxide of tin, ruby tin, resin tin, and deep black crystals. In some 
cases I have seen one-half of a crystal white and the other half 
red; while in others, again, the different colours blend, one with the 
other, ina most remarkable manner. The tinstone also varies 
greatly in its degree of coarseness, large crystals an inch through 
being associated “with the finest dust and this, in addition to the 
amount of slimes necessarily made in crushing a brittle mineral 
like tinstone with a battery, renders perfect saving appliances 
absolutely necessa 
At Pearson’s claim, Silverton, previously referred to, some of 
the tinstone has a most remarkable iridese cence—green, red, and 
blue—imparting toi it the appearance of a copper mineral, but this 
is probably due to some physical character of the tinstone, although 
it is possible that impurities in the ore may account for it 
* At Hogue’s Creek lodes Mr. Wilkinson reports its occurrence with tin 
and Bismith. (Vide Annual Report, Department of Mines, p. 155, 1883.) 
