ABSTRACT OF PRO CEEEIN GS . 
XIII. 
U.S.S.K., and Australia would be well advised to adopt these methods 
wherever possible. Some years ago, under Mr. Broughton Edge, there 
was conducted in the Commonwealth an investigation into the applica- 
tion of these methods to Australian occurrences. The general con- 
clusions indicated that the methods were just as applicable here as else- 
where. Of recent years there has been a special development in the use 
of Ultra-Violet light in the detection of scheelite (Calcium tungstate )- 
bearing ore deposits and as this mineral is of especial importance in 
connection with the production of Tungsten carbide and Tungsten metal 
as powder, rod or filament it is of more than ordinary interest to 
Australia and especially to Queensland. A portable ultra-violet light 
apparatus operated by a 6-volt battery producing filtered ultra-violet 
o 
light of a wave-length of approximately 2500A is especially suitable 
and an illustration of the use of the apparatus was given during the 
address. Consideration was given to the geophysical tests grouped 
under magnetic, gravimetric, seismic both refraction and reflection, and 
electrical. The application of these methods to the discovery of ore 
deposits and to the. determination of structures of especial significance 
to engineering geological problems in Australia was discussed. The 
manner in which such tests could have been used to advantage in con- 
nection with the G-rey Street and Story Bridges in particular was 
shown and the great desirability of using the tests generally in develop- 
ing the mining resources of the country was particularly pointed out. 
Mr. H. A. Mitchell, the Chairman of the Brisbane Division of the 
Australian Institution of Mining and Metallurgy, expressed appreciation 
on behalf of the members of his Association for the invitation to be 
present and moved a vote of thanks which was seconded by Dr. E. 0. 
Marks. 
