Exploration for porphyry-style copper mineralisation near Llandeloy

Pigum? 47 Cumulative f reguency plot of magnetic susceptibility data from the Llandeloy area, showing component
populations
Gravity survey
Two detailed traverses were made across the lWandeloy
survey area in an attempt to resolve some of the
questions raised by the magnetic data. Fig. 11 shows the
line of the traverses and Fig, 48 the profiles.
The maximum residual anomaly revealed by the pro-
files is only 0.5 mGal and quite local, implying that no
Pigwe 48 Bouguer anomaly profiles from the Llandeloy area
major rock mass of anomalous density underlies the area.
The density measurements on borehole cores (Appendix
4) show little variation within the sedimentary rocks,
which gave an average of 2.79 g cm-3. Values obtained
for intrusive rocks varied considerably, from 2.67 g cm-3
for a porphyritic microtonalite to 2.85 g cm'3 for a
quartz-microdiorite, but average 2.7 5 g ern-3. If the
value obtained for the ?Cambrian quartz wacke and
Distance in mstrw along projenion of travetee onto line bearing 31 So
4 8