Exploration for porphyry-style copper mineralisation near Llandeloy
Exploration for porphyry-style copper mineralisation near Llandeloy
Exploration for porphyry-style copper mineralisation near Llandeloy
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CRYSTAL TUFF: as above<br />
VOLCANIC BRECCIA: as above<br />
CLAY GOUGE:<br />
VOLCANIC BRECCIA: as above<br />
MICROTONALITE, porphyritic, as above. Pyrite<br />
sparse, disseminated<br />
SILTSTONE: thin beds, sandy and pebbly<br />
MICROTON ALITE, porphyritic: as above<br />
CLAY GOUGE: with lost core<br />
MICROTONALITE, porphyritic: as above, unweathered<br />
below 26.91. Phenocrysts feldspar 8 mm, amphibole,<br />
rare quartz in greyish-green matrix. Upper contact<br />
sharp, horizontal. Quartz veins at intervals.<br />
Pyrite sparse, disseminated with concentrations<br />
below 26.92<br />
MICROTONALITE, porphyritic: as above, sharp upper<br />
contact 50'. Network fractures at top, below 28.60,<br />
29.28-29.64 with quartz veinlets, chlorite. Pyrite<br />
abundant disseminated to 28.00, 29.28-29.64 and<br />
else where, also veins. Veins porphyritic micro-<br />
diorite below 29.80 richly pyritic<br />
MICRODIORITE, porphyritic: phenocrysts feldspar<br />
up to 8 mm, amphibole to 1 cm in green matrix.<br />
Sharp upper contact. Pyrite plentiful, disseminated<br />
and in hair fractures<br />
QUARTZ-MICRODIORITE: sparse phenocrysts feldspar,<br />
amphibole in medium-grained feldspathic rock.<br />
Some xenoliths sedimentary rocks, diorite. Upper<br />
contact broken. Grain-size reduces below 33.19; rock<br />
is porphyritic to 33.93, fine-grained non-porphyritic<br />
to base. Pyrite disseminated and in fractures with<br />
chlorite, locally abundant especially 3 1.80-32.47<br />
MICROTONALITE, porphyritic: as above, variable<br />
concentration phenocrysts. Network fractures,<br />
breccia with chlorite veinlets at intervals 35.09-38.27,<br />
42.97-44.91. Quartz veinle ts, rare carbonate. Epidote<br />
below 43.27. Pyrite disseminated, concentrated in<br />
fracture zones<br />
END HOLE