168 
portions were taken separately—(i) whitish; (2) brownish; (3) bulk 
sample. The resulting mass is precisely the same in appearance as that 
obtained from a similar test on imported felspar. The test shows that 
it could be made directly marketable, as almost all the sample could be 
utilized. 
The American production is as follows:—- 
Short tons. 
Value (dollars). 
Value per short ton. 
s • d - 
T 9°5 
35 ? 4 I 9 
226,157 •. 
160 
1906 
72,656 . 
4 OI , 53 I 
12 6 
If this deposit is extensive it should be examined and reported on in 
full. With any development of the pottery industry an extensive bodv 
of felspar at all like this sample would be of direct commercial value. 
The conditions of good workable felspar are that it should be prac¬ 
tically free from iron oxide, mica, and quartz. It is used as a glaze for 
chinaware and tiles, in the manufacture of certain varieties of glass, and 
in soap manufacture. The principal use is for white earthenware*or 
porcelain. 
Cassiterite. 
In the course of my work on Quarter-sheet 45 N.E. (New Series), in 
the Mansfield district, Mr. Wilson, of Glen .Creek, Nillahcootie, showed 
me some samples of black minerals which he had obtained in allotment 
22, parish of Tallangallook, whilst prospecting for gold last year. A 
blow-pipe examination showed them to be tourmaline and cassiterite. One 
grain of cassiterite was as large as a pea. The tin was found in an 
alluvial deposit composed of granite drift, granite boulders, quartz wash, 
and consolidated granite detritus at no great distance from the granite 
outcrop, in which the massive felspar was observed (see map). Mr. 
Wilson informed me that he never saw bed-rock, nor did I when I ex¬ 
amined the place, and can therefore only furnish a section showing about 
20 feet of granite drift covering a heavy wash of granite and quartz 
boulders. Several prospects from the face failed to give any trace of 
tinstone, but these prospects came from the headings near the top of the 
boulder wash. 
Appnoximate scale , ZOfeet to One inch. 
SOUTH NORTH 
Fig. 39. 
There is a large area of granitic detritus similar to that shown in the 
section, and none of it has been prospected for tin. 
[Report sent in p.4.05.] 
