306 H. I. JENSEN, 
deposits of Moruya, Ettrema, Talwong and Burragorang 
lie on a narrow belt preserving the same N.S. direction. 
West of this belt lies the copper-gold-mispickel belt which 
includes Araluen and Braidwood. 
The ore deposits of Moruya, Ettrema and Talwong are 
all of a highly complex and refractory character, containing 
much zine and arsenic. Fortunately antimony is absent. 
The similarity of the ores and the main structural line leads 
one to expect that many other similar deposits are hidden 
under the sandstone capping. These may be discovered 
and tapped in time to come. Because of the sandstone 
covering, the mineral lodes occur in almost inaccessible 
gorges (excepting at Moruya) and are exposed only where 
the bed of a creek has dissected them. 
The only ore deposit in this area which I have examined 
is that of the Ettrema canon near Sassafras. It is highly 
instructive, casting light upon the geological history of 
the district and its own origin. This ore deposit was dis- 
covered by John McKane and Sons of Oallen, near Tarago, 
and Mr. John R. Chaffey. It occurs in the bed of the 
western branch of Ettrema Creek (called Rolfe’s Creek). 
This creek follows for a distance of half a mile or more 
above and below the ore deposit an old fault running N.N.W. 
to §.8.E. and antedating the deposition of the Permo-Car- 
boniferous strata. The fault dips W.S.W. at 60°, and the 
eastern side is the downthrow side. East of it the strata 
dip gently towards the west and pitch towards the north. 
West of it they are thrown into an overfold, overthrust 
from west to east. The fold is partly shown in section by 
denudation, and its western limit is faulted and down- 
thrown some distance. Both the principal fault and the 
secondary fault have acted as channels for the ascent of 
metallic solutions from below. The strata east of the 
principal fault consist mainly of Devonian quartzites and 
