Exploration for porphyry-style copper mineralisation near Llandeloy

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SANDSTONE: as above CLAY GOUGE: SANDSTONE: as above. Laminated to thickly bedded, Wispy laminae, thin beds silty mudstone generally uncommon to common, but abundant 100.18-100.83, 102.89-105.61, 108.70-109.22. Purple and green banded sandstone 98.49; magnetite sand laminae 1.02.32 and 108.92. Bedding 70". Network fractures and breccias with chlorite veining at intervals throughout. Pyrite disseminated, in veinlets and veins up to 1 cm, locally abundant. Calcite, quartz and epidote veinlets variable. Chalcopyrite 96.40-97.44 SANDSTONE: bluish-grey, massive, medium grained to 114.17; coarse-grained, graded, quartzose below. 1 cm mudstone with magnetite laminae at 114.17. Minor pyrite MICROTONALITE, porphyritic: as above. Upper contact 45O. Xenolithic. Pyrite not abundant MICROTONALITE, porphyritic: as above. Sharp irregular upper contact; 10 cm chilled zone. Pyrite moderately abundant in veinle ts, disseminated and irregular fractures. Epidote veinlets common,.quartz less so. Chalcopyrite and ?galena in quartz veln 122.47 END HOLE
APPENDIX 2 GEOPHYSICAL MEASUREMENTS IN THE LLANDELOY AREA Line-by-line descriptions are given of pseudosections measured along traverse lines only in the area of detailed investigations around Treffynnon. A subjective interpretation has been made of the pseudosections shown in A2.1-A2.9 (see Fig. 41 for locations). Near- surface anomalies are assigned in the text to the dipole positions at which they are estimated to occur, while deeper anomalies have been identified as such. Line 2500E Resistivity is low to moderate on most of the line, and generally-lower at the surface than at depth. arrow lows occur at about 720N and probably off the end of the line at about 350s. At about 620N and 75N lie narrow resistivity highs. Chargeabili ty is moderate on much of the line, but the north end has a lower, and the south end a higher IP response. A narrow maximum occurs at about 600N. Line 2900E Again low to moderate resistivities are seen. increasing: generally with depth. Near surface values *are rathe; higher between 400 and 450N, and at about 1100N. Four narrow resistivity lows occur, at 1120N, 850N, 670N and 370N approximately, of which the last is the strongest. Low resistivity material extends to greater depth to the south of 370N than to the north. Chargeability is moderate except for a high at the northern end of the traverse. A narrow high at lOOON coincides with a road, and a possible high lies at depth below about 150N. Line 3100E Low resistivity occurs to depth on the whole traverse except the northern end, where values are moderate to high. The two sections are separated by a narrow minimum at 720N. Most of the line also has low chargeability, but highs occur at 500 to 720N and north of 1200N. The former occurs where the line passes Tref fynnon village. Line 3500E Resistivity on this line is generally moderate to high, although some surficial lows occur, notably at 300 to 600N. At the northern end of the line, however, resistivity is low to depth. A narrow low lies at about 320N. Chargeability is high on the southern part of the traverse, with a maximum at 720N, and a broader high southwards from 450N. Line 3700E Most of this line seems to be underlain by hi h resistivity material at shallow depth (probably
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Natural Environment Research Counci
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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
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Page 80 and 81: APPARENT ESISTMTY H Bbs ys 06 q6 CH
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Page 84 and 85: z ~ 1 ~ 1 ~ 1 ~ 1 ~ 1 APPARENT FEJS
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Page 88 and 89: MAGNETIC FELD IN NAFTESLA Y /-*-.-.
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Page 94 and 95: PHYSICAL PROPERTY MEASUREMENTS ON B
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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 . .
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Page 112 and 113: Fig.7 Aeromagnetic anomaly map of t
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Exploration for porphyry-style copper mineralisation near Llandeloy

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