Exploration for porphyry-style copper mineralisation near Llandeloy

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- 1;;::;;j x X ZX X X X X * X X X X X X X X X So11 Drl ft dep osrts Feldspar sand and clay Gravel bed Sllt Mlcrodrorrte Porphyrrtrc m~crodrorlte Q ECQCt C ECQCt QCM ECQCtMCp QECCtS QEKCtCS KECtH QEC QEC QECKCt ECQCtK E E QCE Q QECtC Q Quartz C Chlor~te Ct Carbonate E Eprdote K K-feldspar S Serlclte H Hemat~te Quartz drorlte M Magnetite L CHEMICAL ANALYSIS CJ n PPm 1 $6 3 *Hot HNOB extractable ~alf detect~on l~rn~t values subst~tuted <strong>for</strong> levels less than the detect~on l~rn~t Serlcrte-chlorrte-amphibole Serrclte-chlurlte-magnetrte Serrcrtt-cl~lorrte-brotlttK- feldspar ppm % pprn % Cu Pb Zn Fe As Mo K,O Sencrttchlorrte-magnetrte-amphibole-K- feldspar BOREHOLE 4 w Base of weathered zone ~p Chalcopyrite tm Sencrte-chlonte with rare ep~dote F Probable fault 'FRACTURING-Broken core may conceal lengths of network or other fractur~ng A Fresh amphibole - I P MAGNETIC SUSCEPTIBILITY 0 30 60 ms 0 10 20 30 40 x10-~ SI urllt
Fig.25 BOREHOLE 5 C C C C Ct C E K Ct E E CH QHC E C Q H ' E H EC H H E C M Q C Q C Q C Ct E Ct K C Ct K 2 74 9 75 11 58 Lost Water -1 3 41 Soil D~ft deposits Feldspar sand and clay Silt and sand Q E C Quartz Epldote Chlorite Tonal~te Ct Carbonate W-+ Base of weathered zone H Hematite F Probable fault M Magnetite I - lntrus~on breccia vein U) W J a CHEMICAL ' ANALYSIS CHEMICAL ANALYSIS + MAGNETIC SUSCEPTIBILITY 275 20 80 360 270 20 70 2 90 325 20 70 2 80 310 20 70 300 360 10 80 4 20 14630470io 90 670 Lost Water-1 1768C330 5 80 17 68 10 70 4 30 20 73 Lost Water- +21 34 * Hot HNO, extractable W seric~te-chlorite-blotlte 23 78 wlth some epidote serlclte-chlorite-magnetite amphibole-K feldspdr-epidote sericite-chlor~te-r~idyrietlte serlclte-chlor~te sericite-chlonte- K feldspar + Half detect~on I~ni~t v,tlues subst~tuted <strong>for</strong> levels less than the dtte~t~on Iini~t
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Natural Environment Research Counci
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Report No. 78 @ Crown copyright 198
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SUMMARY REGIONAL STUDIES Intrusive
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SUMMARY Geological, geochemical and
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concluded that except for Zn the re
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The only rock containing evidence o
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Table 3 Analyses of miscellaneous r
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- 28 St. Brides Bay -
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Hercynian orogenies (M. 3. Arthur,
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Figure 14 Location of soil anomalie
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producing a very limited dispersion
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-1 00- Contours of VLF horizontal i
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area and periglacial and glacial de
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the Brunel Beds or the Tetragraptus
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contains sparse subhedral plagiocla
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There is some variation in the alte
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The cause of other isolated weak Cu
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j Table 9 Summary of analyses of in
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increase the Zr content. The divisi
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variation between pu8M microdioritn
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T/I~~/~~IPYS openjoi~~tcd limestone
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Table 13 Summary statistics for sed
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than average values quoted for sand
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Introduction The main geophysical m
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Figure 42 Contour map of apparent r
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Figure 45 Contour map of tow magnet
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Pigum? 47 Cumulative f reguency plo
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it to this late propylitic alterati
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HOLWSTER, V.F. 1974. An appraisal o
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APPENDIX 1 ABBREWATEI) BOREHOLB LOG
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BOREHOLE 2 Registration Number STvI
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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: !2 CO N A 4 ul o ~n o ul 0 DEPTH IN
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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