92 PROCEEDINGS OF THE ROYAL SOCIETY OF QUEENSLAND. 
South of the Macdonnell Ranges at Rumbellara there are ochre* 
deposits worked. In the Hart's Range and in the Strangway Range 
there are numerous muscovite deposits and at least one large phlogopite 
deposit. The commercial muscovite always occurs in lenticular mica- 
rich shoots or bunches in pegmatite dykes. The phlogopite mica is in 
the main occurrence developed in an ultrabasic dyke which has differen- 
tiated into an olivine rock in the centre (dunite) and augite-enstalite 
rocks on the two walls. Each of the three sections is 30 ft. or more in 
width, and the phlogopite occurs along veins in the olivine rock. 
Potassic solutions from the later pegmatite dykes have played a part in 
producing the phlogopite. This occurrence is in the Strangway Range. 
Phlogopite in small uncommercial books occurs in several other 
localities, e.g., in basic dykes in the Hart's Range and in limestone as 
well as gabbro at the large apatite deposit 90 miles from Alice Springs 
on the Hart’s Range Road. The apatite occurrence mentioned is one 
of great dimensions and excellent purity. It is produced as a pneumato- 
lytic emanation from a large basic intrusion and largely replaces Aruntan 
crystalline limestone. Garnets are very abundant in numerous 
formations in the Hart’s and Macdonnell Ranges, and they are most 
plentifully and perfectly developed in certain amphibolite zones. Though 
ruby and sapphire should occur in the Central Australian massif, it is. 
doubtful if any have yet been found. The Macdonnell Range ‘‘ruby”’ 
is mostly garnet. 
There is in the Hart’s Range an asbestos occurrence of some 
magnitude, and in the plains north of the Plenty River there are large 
kaolin deposits fringing the Aruntan rocks. In Mount Strangway there 
are large developments of kyanite rock accompanied by staurolite. How- 
ever all these minerals are so low-priced that it does not pay to mine any 
except the mica. 
Beryl occurs in the pegmatite dykes but is subordinate in amount. 
In addition to mica, wolfram, tin and tantalite are pegmatite 
minerals; but as these minerals hug the contacts of the large granite 
masses and as the granites from which the pegmatite dykes are offshoots 
are deeply buried under the Hart’s and Strangway Ranges these 
minerals do not occur in that area, but do make their appearance in 
both Aruntan and Mosquito Creek rocks where intrusive granites occur 
nearby. Thus wolfram occurs in an aplite-pegmatite dyke north of the 
Plenty River and also in a similar rock about 10 miles north-west of 
Barrow Creek, the dykes in each case intruding Arunta Complex. Tin 
occurs with tantalite in aplite-pegmatite dykes at Anningie intruding 
Mosquito Creek rocks. 
In the Jervois Range, which the writer has not visited, about 300 
miles north-east of Alice Springs, there are great silver-lead and copper 
deposits in fissure lodes in rocks which correspond to the Mosquito Creek 
Series, and at the Home of Bullion Mine about the same distance north 
of Alice Springs there are large copper lodes. But it does not pay 
to work these metals at present. Smaller copper lodes also occur about 
80 miles north-east of Alice Springs in limestone of the Arunta Complex, 
