OCCURRENCE OF PRECIOUS STONES IN N.S.W. 229 
This agrees exactly with the writer’s experience, but having 
_actually collected sapphire from various districts, I describe the 
deposits in which the sapphire is found in the following localities : 
Tumberumba.—At Tumberumba where sapphire is not uncom- 
mon, the gem is obtained chiefly when working Pleistocene and 
recent deposits for gold. These deposits are derived to a great 
extent from the denudation of a Tertiary lead, portions of which 
still remain capped with basalt high above the level of the present 
streams. The relations of the deep lead to the Pleistocene are 
shown on the accompanying sketch. Both deposits have been 
Section at Tumberumba showing a, alluvial drift with gold and gem- 
stones covered by basalt; b, Pleistocene deposits with gold and gems 
made up in part of the redistributed drifts from a; ¢, Slate. 
fairly well exploited in the pursuit of gold. The geology of the 
district has been dealt with by Mr, Wm. Anderson." 
During a short stay in the district a few years ago I had an 
opportunity of examining the Tertiary lead, as active mining 
operations were being carried on at the time. Very little sapphire 
was found in the deep lead (a in diagram), the bulk of the 
corundum coming from the Pleistocene and recent deposits (4). 
Associated with sapphire I noted spinelle, topaz, andalusite, and 
garnet. The Pleistocene deposits containing the gems were 
me 
* Notes on the Tertiary Deep Lead at Tumberumba, by Wm. Anderson 
> ante of Geological Survey of N. 8. Wales, Vol. 11., p. 21. See also 
- 4. Carne, in the Annual Report of the Department of Mines N.S. 
Wales, 1894, p. 120, 
