Exploration for porphyry-style copper mineralisation near Llandeloy

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BOREHOLE 3B Registration Number SM 82NE/5 Grid Reference SM 8546 2857 Height above O.D. 118.5 m Casing to 9.45 m Recent Description of strata SOIL: Pleistocene CLAY: sandy, pebbly, massive heteroli thic CLAY: silty, sandy GRAVEL: ?Tertiary CLAY: silty, bedded with thin gravel beds FELDSPAR SAND AND CLAY: deeply weathered feldspar sand with white clay laminae up to 4 mm GRAVEL: FELDSPAR SAND AND CLAY: deeply weathered, regular alternation 1.3-2.0 ern sand and 0.2-0.4 em clay to 5-94. Thickness variation below this GRAVEL: heterolithic, waterworn pebbles above 8 cm Iithic sand layer CLAY: retrieved with small pebbles 17.48-17.68 only SILT: sludge only END HOLE
BOREHOLE 4 Registration Number SM 82NE/6 Grid Reference SM 8566 2874 Height above O.D. 123.7 m Casing to 8.23 m Recent Description of strata SOIL: Pleistocene CLAY WITH PEBBLES: FELDSPAR SAND AND CLAY: deeply weathered, regular alternation of sand 1-2.5 cm, clay 0.3-1.0 cm to 2.23; irregular below GRAVEL: heterolithic FELDSPAR SAND AND CLAY: regular bedding as above. Some beds gravel with diorite pebbles only. Thick clay beds below 7.77 MICRODIORITE: medium grained, feldspathic with sparse phenocrysts, feldspar and amphibole up to 5 mm. Deeply weathered to 15.24. Quartz veins up to 2 cm at intervals with some adjacent silicification. Chlorite veinlets between 22.00-24.00; epidote veinlets mainly below 22.00; some epidotisation 17.30, 22.00. Pyrite disseminated and in fractures moderately abundant 11.36-11.50, minor below, but in veins with gangue at intervals. Chalcopyrite below 22.00 MICRODIORITE: as above. Sharp, irregular intrusive contact 30" at top. Porphyritic marginal phase to 25.59. Carbonate alteration, some epidote veinlets. Quartz veins with pyrite and chalcopyrite 25.75-25.85. Also disseminated pyrite MICRODIORITE: as above. Sharp upper contact 45O, porphyritic to 26.40. Patchy texture below 27.31, mainly due to recrystallization. Sparse veining. Pyrite rare disseminated, in veinlets with epidote 27.31-27.85. Chalcopyrite at 27.84 MICRODIORITE, porphyritic: fine-medium grained, greyish-green with phenocrysts feldspar 2 mm, hornblende 5 mm. Patchy carbonate alteration. Xenoliths up to 6 cm at 29.64, 31.78. Pyrite sparsely disseminated; com monly in veins with quartz, feldspar, chlorite, epidote to 32.80 only QU ARTZ-DIORITE: coarse-grained, feidspathic; sparsely porphyritic with plagioclase to 2 mm, hornblende to 5 mm increasing in proportion downwards. Sharp irregular upper contact with upward penetrating flames. Basic xenoliths at intervals; pegmatitic patch 34.15. Quartz veins rare, Epidote, chlorite, quartz, carbonate, feldspar veins more common; local epidotisation. Patchy recrystallization and textural variation. Pyrite in veinlets and disseminated only at 34.65, 35.90, 37.85-38.02 END OF HOLE
Page 1:
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 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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