Exploration for porphyry-style copper mineralisation near Llandeloy

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Report No. 78 @ Crown copyright 1985 BRITISH GEOLOGICAL SURVEY Natural Environment Research Council Mineral Reconnaissance Programme Exploration for porphyry-style copper mineralisation near Llandeloy, southwest Dyfed Geology P. M. Allen, BSc, PhD Geochemistry D. C. Cooper, BSc, PhD P. Bide, BSc D. G. Cameron, BSc Geophysics M. E. Parker, BSc Mineralogy H. W. Haslam, MA, PhD, MlMM G. D. Easterbrook, BSc I. R. Basham, BSc, PhD, MlMM A report prepared for the Department of Trade and Industry Keyworth, Nottinghamshire . 1 985
Page 1: Natural Environment Research Counci
Page 7: Mineral Reconnaissance Programme Re
Page 10 and 11: The solid geology of the area aroun
Page 12 and 13: , - - Roads (selected) - Streams 1-
Page 14 and 15: Nevertheless taking into account on
Page 16 and 17: Table 2 Analyses of intrusive rock
Page 18 and 19: (Table 2, no. 251, contains elevate
Page 21 and 22: Correlations > 99.95 significance.
Page 23 and 24: Electromagnetic survey The airborne
Page 25 and 26: elated to the presence of mafic sil
Page 27 and 28: -0- Contours of magnetic anomaly. 4
Page 29 and 30: and geophysical anomalies were iden
Page 31 and 32: sedimentary rocks, which, though un
Page 33 and 34: 0 0 Dril? deposits l2-l Interbedded
Page 35 and 36: intrusive rocks are affected, as ar
Page 37 and 38: pyrite do not usually exceed 1 cm i
Page 39 and 40: Igneous rocks Distribution of analy
Page 41 and 42: Figure 32 Plots of SiO2 v MgO, CaO,
Page 43 and 44: showing a possible increase. Conseq
Page 45 and 46: propyli tic alteration all these el
Page 47 and 48: Zinc levels are broadly similar to
Page 49 and 50: 1 Quartz ' 1 microdiorites , BH2 0.
Page 51 and 52: potash con tents whilst in K-feldsp
Page 53 and 54: Figure 41 Interpreted induced polar
Page 55 and 56:
Magnetic surveys Numerous magnetic
Page 57 and 58:
QnD (BH 7) 1 Log rwceptibitity (9 u
Page 59 and 60:
siltstones is typical of all sedime
Page 61 and 62:
prospecting techniques becatlire of
Page 63 and 64:
TUREKIAN, K.K. and WEDEPOHL, K.H. 1
Page 65 and 66:
CRYSTAL TUFF: as above VOLCANIC BRE
Page 67 and 68:
BOREHOLE 3A Registration Number SM
Page 69 and 70:
BOREHOLE 4 Registration Number SM 8
Page 71 and 72:
TONALITE: as above, with sparse fel
Page 73 and 74:
BOREHOLE 7 Registration Number SM 8
Page 75 and 76:
SANDSTONE: greenish-grey, muddy wit
Page 77 and 78:
APPENDIX 2 GEOPHYSICAL MEASUREMENTS
Page 79 and 80:
APPARENT ~ T M T Y VJ OHM METRUj I
Page 81 and 82:
APPARENT fESlSTMiY IN OHM METRES I
Page 83 and 84:
APPARENT fEJSTMTY IN OHM METES I 1
Page 85 and 86:
APPARENT FFSlSTlVlTY IN OHM METRES
Page 87 and 88:
APPENDIX 3 GEOPHYSICAL RESULTS FROM
Page 89 and 90:
APPARENT RESISTIVmY M OHM METRES TO
Page 91 and 92:
-Lazoo -48m '-UMm APPARENT RESSTIWT
Page 93 and 94:
g e B 8 g 8 3 3 8 & ? N , s ~ I 1 I
Page 95 and 96:
oomo ???? md'ba
Page 97 and 98:
Table A4.2 Density and Porosity Det
Page 99:
C* -- FL Cl PT C'I FV 11B5 ONUM CAI
Page 102 and 103:
F1.D PT El-FV ORS fiWl FIX Z V M 2
Page 104 and 105:
Apparent res~stivity ( ohm -metres
Page 106 and 107:
Sample Borehole depth Cu Pb Zn No F
Page 108 and 109:
APPENDIX 8 \Vf ,p,;2i.y tq . . ANAL
Page 111 and 112:
Fig.2. Map showing the solid geolog
Page 113:
Fig.1 1 . Bouguer anomaly map of th
Page 116 and 117:
E53163 F V W I V V v v v v v S t &
Page 118 and 119:
Lz{ A Q Quartz E Epldote n - --1 t;
Page 120 and 121:
- 1;;::;;j x X ZX X X X X * X X X X
Page 122 and 123:
Fig.26. BOREHOLE 6 Q Quartz Drlh de
Page 124 and 125:
F1g.28. BOREHOLE 8 OPEN I HOLE I Q
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Exploration for porphyry-style copper mineralisation near Llandeloy

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