Exploration for porphyry-style copper mineralisation near Llandeloy

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BOREHOLE 2 Registration Number STvI 82NE/3 Grid Reference SM 8526 2847 Height above O.D. 112 m Casing to 3.35 m Description of strata Pleistocene CLAY WITH PEBBLES: FELDSPAR SAND AND CLAY: deeply weathered MICROTONALITE, porphyritic: deeply weathered. Variable content phenocrysts feldspar to 3 mm, amphibole and uncommon quartz, biotite in very f ine-grained ground mass. Quartz veinlets sparse CLAY GOUGE: MICROTONALITE, porphyritic: as above. First fresh rock at 5.57, greenish grey. Xenoliths below 6.05. Quartz veinlets rare. Pyrite sparse in fractures QUARTZ: with epidote, chlorite, hematite, pyrite MICROTONALITE, porphyritic: s above. Some xenoliths porphyritic quartz-microdiorite. Veinlets quartz, pink feldspar rare. Epidote with carbonate, chlorite below 14.02. Pyrite in network fractures, veins, disseminated, locally abundant. Chalcopyrite in quartz-carbonate vein 17.00 QUARTZ-MICRODIORITE: medium grained, feldspathic with sparse phenocrysts 3 m m plagioclase, hornblende. Upper contact sharp, 45". Small xenoliths below 20.73. Quartz veins uncommon. Veinlets chlorite, quar tz-chlorite, quar tz-carbonate occur throughout. Epidote with pyrite veins 19.75-22.38, 23.90-24.42, 27.50. Intense epidotization 25.00. Pyrite disseminated, veins locally abundant. Chalcopyrite in veins with pyrite, 19.80, 22.77, 22.98. ?Autoclastic brecciation, 22.80-28.07 QUARTZ-MICRODIORITE: as above. Some veins carbonate, quartz. Pyrite sparse disseminated and veinlets. ? Autoclastic breccia zone 29.27-29.70 QUARTZ-MICRODIORITE: as above. Upper contact <strong>near</strong>ly parallel core. Network fracturing and breccia veins locally. Pyrite in veinlets common below 29.60. Chalcopyrite at 29.65, 30.07 QUARTZ-MICRODIORITE: as above. Sharp upper contact. Brecciation at intervals. Pyrite sparsely disseminated; veinlets with quartz, chlorite, carbonate and some chalcopyrite END HOLE
BOREHOLE 3A Registration Number SM 82NE/4 Grid Reference SM 8546 2850 Height above O.D. 116.2 m Casing to 8.93 m Recent Description of strata SOIL: Pleistocene CLAY WITH PEBBLES: CLAY: silty with layers pebbly clay and gravel FELDSPAR SAND AND CLAY: deeply weathered; gravel beds between 3.05-4.88, 14.63-16.46 QUARTZ-DIORITE: coarse-grained, plagioclase, hornblende, interstitial quartz, minor biotite. Some xenoliths sedimentary rocks. Deeply weathered; much core lost. Some epidote veinlets CLAY GOUGE: QUARTZ-DIORITE: as above. Minor pyrite cubes; sparse quartz, epidote 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 68 and 69: BOREHOLE 3B Registration Number SM
Page 70 and 71: BOREHOLE 5 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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