 | | Report (issue) | | technical history and exploration with reference to mine workings in the British Isles are welcomed for inclusion...:. R.G. GUTHRIE PUBLICATION AFTERSALES NORTHERN MINE RESEARCH 186 STATION ROAD BILLINGHAM CO.CLEVELAND...CLEVELAND TS232RT Tel: 0642 554437 © NORTHERN MINE RESEARCH SOCIETY SOCIETY This volume is copyright...Sheffield S2 5HH, for the Publishers, The Northern Mine Research Society, Sheffield,· England. ISSN: ISBN:...OF THE C.Eng., NORTHERN SOCIETY. 1979. FGS., MINE FIMM. RESEARCH 6 I ' AUTHORS =====-- NOTE |  | | Journal (article/letter/editorial) | | alteration assemblages from the Welsh Borderland, UK R. METCALFE"', R.E. BEVlNS2 and 0. ROBINSON' 'Department...Bristol BS8 IRJ, UK 2Department of Geology, National Museum of Wales, Cardiff CFI 3NP. UK Localized (domainal)...lavas and volcaniclastic rocks at Builth Wells, Wales, UK suggest that such interpretations cannot be applied...prehnite f pumpellyite f calcite f muscovite f quartz (considered to have formed at c. 200 C and G2.5...pumpellyite prehnite calcite - titanite & chlorite (*quartz). The domains formed at temperatures of 130 230°C |  | | Journal (article/letter/editorial) | | of Chadian and earliest Arundian strata in North Wales: implications for Dinantian (Carboniferous) lithostratigraphy...Eithyn Hall, Llanfarian, Aberystwyth, Dyfed SY23 4BY Wales N. J. Riley British Geological Survey, Keyworth...Eithyn Hall, Llanfarian. Aberystwyth, Dyfed SY23 4BY Wales The late Chadian Foe1 Formation, previously thought...thought to be confined to the Dyserth area of North Wales, forms a poorly exposed but persistent basal unit...the first record of Cf48 assemblages from North Wales and establish an early Arundian age for these beds |  | | Report (edition) | | SURVEY ENGLAND AND WALES EXPLANATION OF SHEET 248 • THE GEOLOG1- OF THE SOUTH WALES CO.A.LFIELD PART...condition of the Rhretic g�oup in. this part of South Wales is well exhibited near Pyle, but a full account..... H. K. Jordan oi his researches on the South Wales Coalfield .. Some new oollieri,es referred to in...No. 8, Llwyn-y-pia Colliery (No. I Pit). No. 9, Gelli C,olliery. No. 10, Pentre Colliery. No. � I , Abergorky...of the anticline may b e traced with ease across Gelli-wion Brook, along the southern side · of Mynydd-y-Glyn |  | | Journal (article/letter/editorial) | | Nomenclature of the Lower Palaeozoic l~ocks of England & Wales,' Sedgwick notes the Coniston Limestone as the equivalent...editions of the Geological Survey Memoir on :North Wales. 3 I t is marvellous that Jukes was able to show...of tile Cambrian & Base of the Silurian in North Wales,' T h o m a s R u d d y ~ describes definite lines...easy to follow, with the exception of that across Gelli Grin, where the faulting of the beds appears to...later in the Geological Survey Memoir on North Wales (2nd ed. 1881), he gives 11,000 feet as a more probable |  | | Journal (article/letter/editorial) | | metasediments of the Vale of Ffestiniog, North Wales T. R. W. Hawkins and f . G. Jones Middlesex Polytechnic...style. KEY WORDS Folding Cleavage Cambrian North Wales 1. introduction and lithostratigraphical setting...relation to the maximal fold structures of North Wales. Figure 2. Geological map of the Vale of Ffestiniog...sedimentary facies and provenance of the Cambrian of Wales and an overall comprehensive review of the Merioneth...an orientated chlorite-muscovite felt and minor quartz with slightly coarser (fine-silt grade) very thin |  | | Journal (article/letter/editorial) | | THE NOD GLAS SEDIMENTS OF CARADOC AGE IN NORTH WALES R. CAVE Twenty feet to thirty feet of black shale...4, Pt. 2, 1965 279 280 R. CAVE MAP OF NORTH WALES S W I N G KNOWN OUTCROPS OF CAE - LLA" CAROlCAN...Fig. 1.-The Y4 outcrop of the Nod Glas in North Wales. (Grid Ref. 33/0134 2659 to 33/0056 2648) 8 ml...with phosphatic nodules THE NOD GLAS IN NORTH WALES 28 1 are some pale grey mudstones containing calcareous...RELATIONSHIPS Accounts of the lowest Ashgdl rocks of North Wales usually place them within the zone of Phillipsinella |  | | Journal (article/letter/editorial) | | the shores of the Irish Sea near Conway in North Wales, through Denbighshire and Montgomeryshiro into the...attention of the earlier geological workers in Wales. As early as 1843 Sedgwick and Salter had noticed...the Berwyn 1 Sir Andrew Ramsay, 'Geology of North Wales' ]~em. Geol. Surv. vol. iii (1866) p. 207. Downloaded...the 1st edition of the Geological Survey maps of Wales (] 850) no attempt was made to show these 'pale...of Upper Silurian age. I n the further survey of Wales (1855) Aveline discovered proofs t h a t what appeared |  | | Journal (article/letter/editorial) | | the GOLD-BEARING DISTRICT of MERIONETHSmRE, NORTH WALES. By Prof. A. C. RAMSAY, F.R.S., F.G.S. THAT part... and W. of Tyn-y-groes. A strong lode, bearing quartz and lead, commences between Dol-y-melynen and the...R O C K S O F N . W A L E S . 243 a r e four quartz-lodes, bearing a little copper, in a mass of trap...Three near Tan'rallt run N. and S. There are two quartz-lodes with lead a little N.E. of Moel Ispri, and...Barmouth. The country in which the Dol-y-frwynog mine lies is interesting, and in part peculiar. I shall |  | | Journal (article/letter/editorial) | | Llanuwchllyn to Llanymawddwy area, south Gwynedd, North Wales M. G. Lockley Department of Geology, University...be laterally equivalent to the upper part of the Gelli-grin Formation; it is also subdivided into two members...new to the Caradoc Series of this area, and to Wales, are noted. 1. Introduction The present study is...(Bassett et al. 1966) within the upper part of the Gelli-grin Formation. Of these five members only the upper...units (members). Between the upper 20 m of the Gelli-grin Formation at Tan y Bwlch (Grid Ref. SH 914240) |  | | Journal (article/letter/editorial) | | 3H ) THE VISIT TO DOLGELLEY, NORTH WALES. EASTER, 1927. REPORT BY THE DIRECTORS: PROFESSOR A. HUBERT...occupying the outcrop of the soft Menevian beds. A quartz lode in the stream and its attendant greenstone...the ruins of the crushing mills and offices of the mine were passed. The last part of the route lay through...between the lower slopes of Mynydd-y-Gader and Gelli-Lwyd at the point of coalescence of the lines of...visited the foot-hills of the Cader range, between Gelli Llwyd and the Gwynant Gorge, for the special purpose |  | | Journal (article/letter/editorial) | | from stage 6. IV.—THB BASIC INTENSIONS EAST OF GELLI HILL, RADNORSHIBE. By H. G. SMITH, A.R.C.S., B...https://doi.org/10.1017/S0016756800200848 East of Gelli Hill, Radnorshire. 501 llwyn, notably forming...elsewhere in a mixture of serpentine and calcite or quartz. Their shape and structure leave no doubt as to...be absolutely unique in the igneous history of Wales,1 and the rock is remarkably fresh. On this question...north, and is continued on the eastern side of Gelli Hill to disappear under the ashes near the Bog, |  | | Book | | A Mineralogy of Wales RfCHARD E. BEYfNS Ocpartmellf o[Geolngy, Nmin11a/Museum of\Valcs, Cardiff AMGUEDDFA...Colliery, Ponh, Mid Glamorgan. National Museum of Wales specimen 48.264.GR 175. ex Cymmer Welfare Library...CE 6 I CES IN WALES 9 30 127 138 6 INTRODUCTION The mineralogy of Wales is diverse. with over...reveal the presence of additional species new to Wales. and perhaps new to the British Isles. It is also...completely new to cience will be discovered in Wales. as techniques for analysing specimens become ever |  | | Journal (article/letter/editorial) | | R. 0. ROBERTS, B . S C , University College of Wales, Aberystwyth. I. II. III. IV. V. VI. INTRODUCTION...consist, in the main, of bastite and secondary quartz, the latter being allotriomorphic, exhibiting undulose...alteration of olivine into serpentine, magnetite, and quartz may be represented by the following equation :—...+ JO2 = 3MgO.2SiO,. 2H2O + FeaO., + SiO, magne- quartz olivine serpentine tite In ordinary light, the...after augite are generally composed of secondary quartz, exhibiting undulose extinction, together with |  | | Book | | the Area. Mines - History Mineralization - General Mine Index (Map References) Mineral Index Minerals of...37 38 39 39 40 PLATES Nantiago Mine Pwllrhenaid Shaft .. Penrhiw Mine Dylife Esgairhir Castell Henfwlch...Cwmystwyth Blaenceulan Pyrite on Calcite (Nantiago Mine) .. ■ .. 11 14 14 17 17 18 19 20-21 22 24 MAPS...Acknowledgements are due to members of The Russell Society (a mine�alogical society based in Leicester) who contributed...dating from the early nineteenth century - the old mine heaps still remaining providing the basis for collecting |  | | Book (volume) | | 9502040 ron t co,..er . N • antyrarian 2 1 · mine, near G . oginan, Aberyst (B_vcourte~vofM, "'Yth...BebbJ n 11 ·1 r. c o The Old Metal Mines of Mid-Wales ~i//lJCff ~fJ fJtt Part 2 Cardiganshire-The Rheidol...United Mines, 1858 .. Machinery Foundations at Bog Mine Cwmbrwyno Plan, 1887 .. Ystum Tuen: Waller and Morris's...the Lode Nantycria: Structure of the Lode Goginan: Mine Section c.1850 .. The Bwlch Area in the 1880's Pwllrhenaid...• .•:-· • CWMBRWYNO - 18 .. TY LLWYD-32 ~GELLI -3/ BWADRAIN-2! ••·.. NANT P' ~ !¾NT • iE |  | | Report (edition) | | ENGLAND 1�ND W..t�LES. THE GEOLOGY OF THE SOUTH· WALES COAL-FIELD. PART VII. THE COUNTRY AROUND AMMANFORD...part of the l\femoir on the Geology of the Sol1th Wales Coalfield, is illustI·ated in Sheet 230 of the New...made between the Carboniferot1s rocks of South Wales and Devonshi1·e than was fo1�merly possible. The...phenomena are finely developed in this part of' Sot1th Wales. For the most part the ice moved southwarils, crossing...assistance has been rende1,ed by mining engineers and mine•managers within the limits of the Coalfield. Our |  | | Journal (article/letter/editorial) | | the re-mapping on the 6-inch scale of the South Wales Coalfield and the ground adjacent thereto, it fell...concretionary, whilst in the upper part, small pebbles of quartz become apparent, and are frequent near the summit...summit. This felspar conglomerate, with quartz pebbles of the size of eggs, varies from that state to a...Bethesda is included in the diabase north of Pen-gelli-uchaf and coloured as a greenstone-dyke. The diabase...1904. 3 ' On the Formation of the Rocks of South Wales & South-Western England ' Mem. Geol. Surv. vol. |  | | Journal (article/letter/editorial) | | Government, Survey u n d e r De la Beehe in South Wales. The region adjoining that to be described in this...ignorance. ~ The Geological Survey m e m o i r on South Wales pays scant attention to this district, and relatively...Goodwick, runs in a W.S.W. direction towards Carn Gelli; on the S.E. side it drops down the volcanic breccias...and to belong to a very conspicuous zone in South Wales occurring close below, or in the immediate neighbourhood...of Strumble Head past Goodwick and through C a m Gelli. Thirdly, the central outcrop of ]avas and breceias |  | | Journal (article/letter/editorial) | | numbered among the most picturesque areas of N o r t h Wales, and exposures are everywhere so numerous t h a...Classification of the Fossiliferous Slates of North Wales' Q. J. G. S. vol. iii, p. 147. The presence of the...consist here, as almos~ everywhere in N o r t h Wales, of a great series of greyish-blue flaggy slates...seems at first sight rather different from that on Gelli-llwyd and other localities east of the Gwynant and...the strike; but, between the Gwvnant Valley and Gelli-llwyd, the outcrop of the rhyolitic rocks is'interrupted |  | | Report (volume) | | thanks to the Council of the University College of Wales, Aberystwyth, for having released me as far as possible...vV. PLANT, Cwmmawr. Mr. W. RICHARDS, Penrhiw, Ystumtuen. Mr. JOHN Wrr,1,1AMS, Esgairmwyn. To Capt. GEORGE...Estate, I am indebted for perrnission to use the mine records and plans in the Estate Office; to 1\Ir...IX.-Longitudinal Section of Loveden Mine • • X.,, ,, Brynyrafr Mine XI.,, ,, East Daren · • XII.. ,, ,...Dyfngwm districts X:Xll.,, ,, district near Van Mine• XXTII.-Plan of Van fiat.s • XXIV.-Chart showing |  | | Journal (article/letter/editorial) | | these characters in one mineral, and probably both quartz and albite are present. 424 H. G. Smith— This...situated about mid-way between Ty'n-y-coed and Gelli Hill. The intrusion has a north-south trend and...pointed out that at intervals round the base of Gelli Hill, which is a pile of ashes resting on shales...these shows that the rock is made up largely of quartz, but there are fragments of volcanic rocks and...cracks, and their margins, where in contact with quartz, are indented. In fact, the volcanic fragments |  | | Report (issue) | | of the complex Lower Palaeozoic geology of North Wales. The present account is designed to be read in conjunction...Waterfall at Pont Cyfyng, Capel Curig 51 25 Abandoned mine near Sarnau 52 26 Lodes and properties in part of...the two editions of the classic memoir on North Wales by Ramsay (1 866, 1 881) . Supplementary contributions... 195 4) , and subsequently e lsewhere in North Wales (Rast and others, 1 9 58; Beavon and others, 1 961...The whole of the Ordovician volcanism in North Wales is interpreted by Fitton and Hughes ( 1 970) as |  | | Journal (article/letter/editorial) | | Rotational Strike-Slip Faults, Llandeilo, Wales By JOHN F. POTTER ABSTRACT A number of rotational strike-slip...deposits cut by the faults are generally strongly quartz-veined and fracture-jointed near to the disturbance... 6 Rotational Strike-Slip Faults, Llandeilo, Wales 491 KEY TO FAULTS KEEPER'S LODGE U-ETHB MEUSYDD...Cwm Rotational Strike-Slip Faults, Llandeilo, Wales *{£- (p \ " ] HfTRES ^ - 499 ^ ( yj PRINCIPAL...strike-slip faults in the Llandeilo district. 1. Gelli-groes Fault. 2. Pen-Arthur-isaf Fault. 3. Grip Fault |  | | Journal (article/letter/editorial) | | FEATURES. be visited includes a portion of Central Wales bordered by the coast from Towyn to the south of...Subsequen tly a genera l uplift of th e whole of Wales caused renewed excavation in those rivers which...(Equivalent Doubtful) Ceiswyn Beds (Upper part) Gelli-Grin Calcareous Ash Pont-y-Ceunant Ash Chasmops...junction with the slates are ofte n veined with quartz and may contain a certain amount of galena. These...graptolites may be collected at the Blaen-Cowarch Lead Mine and the Aran Slate Quarries, but the identifications |
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