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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SUMMARY<br />
REGIONAL STUDIES<br />
Intrusive Rocks<br />
Classification of Williams (1933)<br />
Reclassification of the igneous rocks<br />
Petrography<br />
Alteration<br />
Mineralisation<br />
Geochemistry<br />
Stream sediment survey<br />
Sampling and analysis<br />
Results and interpretation<br />
Regional geophysics<br />
Magnetic surveys<br />
Gravity survey<br />
Electromagnetic survey<br />
MIDDLE MILL<br />
Introduction<br />
Geology<br />
Mineralisation and alteration<br />
Rock geochemistry<br />
Soil sampling survey<br />
Assessment<br />
Introduction<br />
Introduction<br />
Stratigraphy<br />
Intrusive rocks<br />
Petrography of the intrusive rocks<br />
Weathering<br />
Braxiation, alteration and mifieralisation<br />
Brecciation<br />
Alteration<br />
Mineralisation<br />
Geochemistry<br />
Soil sampling survey<br />
Superficial deposits<br />
Rock geochemistry<br />
CONTENTS<br />
1 Introduction<br />
Induced polar isat ion<br />
2 Resistivity and VLF-EM<br />
Magnetic surveys<br />
3 Gravity survey<br />
3 CONCLUSIONS AND aBCOYMENDATIONS 50<br />
REFERENCES<br />
13 FIGURES<br />
Abbreviated borehole logs from Lhndeloy<br />
Geophysical measurements in the <strong>Llandeloy</strong><br />
area<br />
Geophysical results from the Middle Mill area<br />
Physical property measurements on borehole<br />
cores<br />
Computer modelling of aeromagne tic and<br />
resistivity data<br />
Analyses of borehole cores: trace elements,<br />
Ti, Fe, Mn and Ca<br />
Analyses of borehole cores: major elements<br />
and sulphur<br />
Analyses of stream sediment, panned concen-<br />
trate and water samples from the Solfach<br />
catchment<br />
The Middle Mill and <strong>Llandeloy</strong> prospects<br />
showing the traverse lines followed<br />
during the reconnaissance surveys 2<br />
Map showing the solid geology and rock<br />
sample sites in the area around Middle<br />
Mill and <strong>Llandeloy</strong> Pocket<br />
Location of drainage survey anomalies 8<br />
Drainage survey results <strong>for</strong> <strong>copper</strong> in<br />
stream sediments and panned concentrates 9<br />
Diagrammatic illustration of highly signifi-<br />
cant positive correlations within the<br />
drainage survey data 11<br />
Aeromagnetic anomaly map of west Wales 11<br />
Aeromagnetic anomaly map of the<br />
<strong>Llandeloy</strong>-Middle Mill area Pocket<br />
Interpretation of aeromagnetic profile 1 12<br />
Interpretation of aeromagnetic profile 2 12<br />
Interpretation of aeromagnetic profile 3 12<br />
Bouguer anomaly map of the <strong>Llandeloy</strong>-<br />
Middle Mill area Pocket<br />
VLF horizontal intensity map of the<br />
Lhndeloy-Middle Mill area based on<br />
airborne survey results Pocket<br />
Compilation map of resistivity at<br />
<strong>Llandeloy</strong> and Middle Mill showing a<br />
summary of geo-physical results Pocket<br />
Location of soil anomalies in the Middle<br />
Mill area 14<br />
Cumulative frequency plots <strong>for</strong> Cu, Pb and<br />
Zn in soil samples from Middle Mill and<br />
<strong>Llandeloy</strong> 15<br />
Magnetic anomaly and chargeabili ty map,<br />
Middle Mill 17<br />
VLF-EM and apparent resistivity map of the<br />
Middle Mill area 18
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