Exploration for porphyry-style copper mineralisation near Llandeloy

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BOREHOLE 6 Registration Number SM 82NW/2 Grid Reference SM 8486 2875 Height above O.D. 99.4 m Casing to 9.75 m - Recent Description of strata SOIL: Pleistocene CLAY WITH PEBBLES: buff, structureless sandy clay with subangular pebbles to 0.83; horizontal streaky lamination and increased silt content below CLAY: thinly laminated brown clay and silty clay with rare pebbles passes down into massive clay. Below 2.00 regular alternation, brown clay 2-5 mm, blotchy greyish-orange sandy feldspathic clay 0.5-2.0 cm GRAVEL: interbedded with lithic sand FELDSPAR SAND AND CLAY: regularly interbedded clay and feldspathic sandy clay as above to 3.50; irregular below Downward increase in feldspar content. Clay bed 0.37 m thick at 4.33. Rotted diorite pebble gravel beds ACID LAVA: porphyritic with feupar 3 mm, smaller quartz phenocrysts in greenish-ey finewained groundmass, Feldspar orientation 20" to 35' below 11.0 0. Local brecciation CLAY: ACID LAVA: as above. Rare pyrite CLAY: ACID LAVA: as above. Rare veinlets quartz, chlorite QUARTZITE: greenish grey, poorly sorted, badly fractured, minor write ACID LAVA: as above. Top 10 cm shows contorted bedding. Minor quartz-chlorite veins, 4 cm breccia vein at 22.45. First fresh rock at 20.98 MICROTON ALITE, porphyritic: deeply weathered to 30.46. Plagioclase 3 mm, pseudomorphs after hornblende, minor quartz phenocrysts in fine-grained matrix. Minor quar tz7 chlorite and epidote veining. Breccia vein 33.06. Sparse pyrite cubes END HOLE
BOREHOLE 7 Registration Number SM 82NE/8 Grid Reference SM 8527 2915 Height above O.D. 123.7 m Casing to 8.23 m Recent Description of strata SOIL: Pleistocene CLAY WITH PEBBLES: brown sandy clay, struc tureless with mainly black shale pebbles to 1.07; laminated and silty with sparse pebbles below with pebbly band 1.22-1.30 CLAY: regularly alternating brown-clay 2-3 mm, greyish mottled clay 1.1-1.5 cm with local irregularities. Beds coarse lithic muddy sand below 1.83. Gravel bed ?0.36 cm thick at 4.94 QUARTZ-MICRODIORITE: deeply weathered with sparse plagioclase, amphibole phenocrysts ACID LAVA: deeply weathered, badly broken core, much lost QU ARTZ-MICRODIORITE: medium-grained with sparse plagioclase and hornblende phenocrysts. Deeply weathered. Network fracturing 12.75-14.83 and locally elsewhere. Quartz veins up to 1 cm at intervals, some with pyrite. Quartz-feldspar, epidote and chlorite veinlets uncommon. Locally epidote-pyrite veins. Pyrite, disseminated and in veinlets is locally abundant; especially 15.74, 16.96-18.28 CLAY GOUGE: QU ARTZ-MICRODIORITE: as above. Xenoliths microdiorite and other rocks in upper parts. Glomeroporphyritic below 21.00. Patchy carbonate alteration. Network fractures throughout. Quartz veinlets common. Pyrite abundant in veinlets and disseminated, locally with quar tz-chlorite veinlets. Local carbonate, epidote veinlets and silicification QU ARTZ-MICRODIORITE: as above. Sharp intrusive upper contact. No xenoliths. Downward increase in porphyricity. Numerous epidote veinlets, quartz veinlets not common. Pyrite mainly in fractures 23.00-24.08, 24.47-24.94 QUARTZ-MICRODIORITE: as above. Sharp intrusive upper contact, xenolithic. Network fractures in places. Abundant veinlets quartz, carbonate, chlorite 27.30-27.47. Intense epidotization locally 25.48 to base. Pyrite abundant disseminated and in fractures 25.68-26.02 CLAY GOUGE: QU ARTZ-MICRODIO RITE: as above. Epidotization increases downwards. Pyrite veins and disseminated 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 70 and 71: BOREHOLE 5 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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