Exploration for porphyry-style copper mineralisation near Llandeloy

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BOREHOLE 5 Registration Number SM 82NE17 Grid Reference SM 8585 2885 Height above O.D. 128.05 m Casing to 14.32 m Recent Description of strata SOIL: Pleistocene CLAY WITH PEBBLES: heterolithic, structureless. Buff clay passes down into yeitow brown clay with smaller pebbles PTer t iary FELDSPAR SAND AND CLAY: deeply weathered feldspar sand beds up to 5 cm altFrnate with brown clay up to 5 mm; plentiful pebbles rotted diorite SAND AND SILT: sludge only TONALITE: coarse-grained feldspathic rock with hornblende, interstitial quartz. Deeply weathered with some fresh rock to 20.57. Patchy recrystallization below 20.57. Quartz veins at intervals. Epidote veinlets below 14.50 with some epidotisation. Chlorite veinlets along irregular fractures 14.63, 18.60-19.44, 20.55 with silicification. Pyrite sparsely disseminated to 14.63, mainly in fractures below 19.04, abundant 20.23-20.57 MICRODIORITE, porphyritic: fine-grained, greenish- grey with pseudomorpbs after amphibole phenocrysts 7 mm long, plagioclase 2 mm. Sharp contact and chilled margin against tonalite above, Xenoliths tonalite 22.06-22.12. Intrusion breccia vein at 22.74, 5 cm thick. Clay lined fractures 21.95, 22.18. Pyrite disseminated, in blebs and veinlets locally plentiful TONALITE: as above. Quartz in veins up to 1 cm with pyrite at intervals. Epidotization at 24.32 and below at intervals associated with local brecciation. Chlorite veinlets at irregular intervals. Breccia veins at 24.74, 33.78. Network fractures below 26.82. Pyrite abundant disseminated and in veinlets 24.16-24.87, at intervals 26.15-31.46; in fractures 32.52-33.28, 37.54-38.01. Malachite in quartz-pyrite veins 24.87, 25.98; on joints 26.66, 26.90; breccia vein 24.74 TONALITE: as above. Sharp upper contact; chilled margin, fine-grained to 38.20. Network fracturing with intense pyritization <strong>near</strong> upper margin and below 39.83. Veinlets quartz, epidote, chlorite mainly below 38.20, most numerous 39.83-41.75. Some carbonate veins. Local epidotisation; many veinlets 39.83-41.75. Pyrite disseminated and veinlets to 39.83; disseminated only 41.57-42.14 m. Chalcopyrite in quartz veins 39.41, 39.83-41.75 MICRODIORITE, porphyritic: as above. Sharp contact 45' crossed by quartz veins. Brecciated with abundant pyrite
TONALITE: as above, with sparse feldspar and amphibole phenocrysts, local recrystallization. Crackle breccia; minor veining, but abundant disseminated and veinlet pyrite. Rose quartz vein 43.00 RIICRODIORITE, porphyritic: as above. Chilled upper and lower contach. Abundant pyrite. Chalcopyrite in quar tz-chlorite vein TON ALITE: as above. Minor network fracturing; abundant quartz and chlorite veins. Pyrite abundant in fractures, disseminated MICRODIORITE, porphyritic: as above. Sharp irregular contact. Abundant pyrite; minor quartz veins END HOLE
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Natural Environment Research Counci
Page 5:
Report No. 78 @ Crown copyright 198
Page 9 and 10:
SUMMARY REGIONAL STUDIES Intrusive
Page 11 and 12:
SUMMARY Geological, geochemical and
Page 13 and 14:
concluded that except for Zn the re
Page 15 and 16:
The only rock containing evidence o
Page 17 and 18:
Table 3 Analyses of miscellaneous r
Page 19: - 28 St. Brides Bay -
Page 22 and 23: Hercynian orogenies (M. 3. Arthur,
Page 24 and 25: Figure 14 Location of soil anomalie
Page 26 and 27: producing a very limited dispersion
Page 28 and 29: -1 00- Contours of VLF horizontal i
Page 30 and 31: area and periglacial and glacial de
Page 32 and 33: the Brunel Beds or the Tetragraptus
Page 34 and 35: contains sparse subhedral plagiocla
Page 36 and 37: There is some variation in the alte
Page 38 and 39: The cause of other isolated weak Cu
Page 40 and 41: j Table 9 Summary of analyses of in
Page 42 and 43: increase the Zr content. The divisi
Page 44 and 45: variation between pu8M microdioritn
Page 46 and 47: T/I~~/~~IPYS openjoi~~tcd limestone
Page 48 and 49: Table 13 Summary statistics for sed
Page 50 and 51: than average values quoted for sand
Page 52 and 53: Introduction The main geophysical m
Page 54 and 55: Figure 42 Contour map of apparent r
Page 56 and 57: Figure 45 Contour map of tow magnet
Page 58 and 59: Pigum? 47 Cumulative f reguency plo
Page 60 and 61: it to this late propylitic alterati
Page 62 and 63: HOLWSTER, V.F. 1974. An appraisal o
Page 64 and 65: APPENDIX 1 ABBREWATEI) BOREHOLB LOG
Page 66 and 67: BOREHOLE 2 Registration Number STvI
Page 68 and 69: BOREHOLE 3B Registration Number SM
Page 72 and 73: BOREHOLE 6 Registration Number SM 8
Page 74 and 75: BOREHOLE 8 Registration Number SM 8
Page 76 and 77: SANDSTONE: as above CLAY GOUGE: SAN
Page 78 and 79: --- APPARENT ESISTIVITY pa IN OHM M
Page 80 and 81: APPARENT ESISTMTY H Bbs ys 06 q6 CH
Page 82 and 83: z ~ l ~ ~ ~ l ~ l . ~ l ~ , ~ l l A
Page 84 and 85: z ~ 1 ~ 1 ~ 1 ~ 1 ~ 1 APPARENT FEJS
Page 86 and 87: z ~ l $ l l l l l ~ l l ~ l l l l ~
Page 88 and 89: MAGNETIC FELD IN NAFTESLA Y /-*-.-.
Page 90 and 91: !IN@ a 8 g e s s I! s F N : , S ? I
Page 92 and 93: ~ N & E e 8 g B 8 8 7 a F N . S ~ 9
Page 94 and 95: PHYSICAL PROPERTY MEASUREMENTS ON B
Page 96 and 97: Borehole 8 (diameters of core 9-72
Page 98 and 99: APPENDIX 5 COMPUTER MODELLING OF AE
Page 101 and 102: RMS RESID - 6.53 FLU. PT ELEV ORS n
Page 103 and 104: MRGNET I C: TIJTERF'HFTAT 1014 . .
Page 105 and 106: ANU.YSB OF BOLPROLB CORE& TRACE ELE
Page 107 and 108: . Sample BH , Depthv ,(m); -, - . ~
Page 109: . , I , . . . . .. . , . , '," . ',
Page 112 and 113: Fig.7 Aeromagnetic anomaly map of t
Page 115 and 116: \ Fig.13. Compilation map of resist
Page 117 and 118: Q Q E C E CCt C E Ct C Q Ct CtQ C Q
Page 119 and 120: !2 CO N A 4 ul o ~n o ul 0 DEPTH IN
Page 121 and 122:
Fig.25 BOREHOLE 5 C C C C Ct C E K
Page 123 and 124:
Fig.27 BOREHOLE 7 E Q C Q E C 0 Q E
Page 125:
81 82 83 84 Fig.30. : Location of c
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Exploration for porphyry-style copper mineralisation near Llandeloy

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