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Gwynfynydd Mine

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Journal Article
Published: 01 October 2001
Exploration and Mining Geology (2001) 10 (4): 249–272.
... quantitatively using the semi-variogram. Understanding of geological features such as reef texture and structure will provide improved models for the interpretation of assay data, drill core descriptions, etc. In this paper, a case study from the quartz-hosted gold occurrences in the Gwynfynydd mine, United...
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General surface geology of <b>Gwynfynydd</b> <b>mine</b> area showing outcrop of Chidlaw ...
Published: 01 October 2001
Fig. 2. General surface geology of Gwynfynydd mine area showing outcrop of Chidlaw Lode and projected position of underground workings in the Chidlaw Lode. The Link Zone segment is bounded faults that converge upward and cut out the Lode before it reaches the surface. The map is based on Ashton
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Composite level plan of the <b>Gwynfynydd</b> <b>mine</b> (Wales, U.K.) Chidlaw Link Zone...
Published: 01 January 2000
Fig. 10. Composite level plan of the Gwynfynydd mine (Wales, U.K.) Chidlaw Link Zone showing location of major block bounding A-B and C faults, mother vein, gold-bearing footwall vein, stopes and major gold zones (>6 kg Au) between the upper 6 level and lower 110 level. Source: Welsh Gold PLC.
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Plan of the geology of the early stages of development of the 40 level driv...
Published: 01 October 2001
Gwynfynydd Mine Ltd.
Journal Article
Published: 01 December 1988
South African Journal of Geology (1988) 91 (4): 450–464.
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F IG . 1. Terranes (A-F,  Table 1 ) north of the Iapetus suture,
together w...
Published: 01 December 2000
Burn, 10 = Cononish, 11 = Glen Lednock, 12 = West Water, 13 = Borland Glen, 14 = Mauchline basin, 15 (shaded area) = Glengaber: Moffatt and Glengap, 16 (shaded area) = Leadhills: Shortcleuch Water, 17 (shaded area) = Galloway: Glenhead and Fore Burn, 18 = Gwynfynydd mine, Dolgellau gold belt, North
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Laminated high-grade hangingwall vein with barren spurs, Poverty Reef, Nick...
Published: 01 January 2000
is in Clogau shale (CS) and its hangingwall in greenstone (GS). Location: 40 level (40 feet below 6 level, see Fig. 10 ), Chidlaw Link Zone, Gwynfynydd mine, Wales, U.K. Photo: Welsh Gold PLC.
 Plate 1d. Photograph showing the effects of late-stage activity on a pre-existing coarse gold-bearing vein. Overall
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Laminated high-grade hangingwall vein with barren spurs, Poverty Reef, Nick...
Published: 01 January 2000
is in Clogau shale (CS) and its hangingwall in greenstone (GS). Location: 40 level (40 feet below 6 level, see Fig. 10 ), Chidlaw Link Zone, Gwynfynydd mine, Wales, U.K. Photo: Welsh Gold PLC.
 Plate 1d. Photograph showing the effects of late-stage activity on a pre-existing coarse gold-bearing vein. Overall
Image
Laminated high-grade hangingwall vein with barren spurs, Poverty Reef, Nick...
Published: 01 January 2000
is in Clogau shale (CS) and its hangingwall in greenstone (GS). Location: 40 level (40 feet below 6 level, see Fig. 10 ), Chidlaw Link Zone, Gwynfynydd mine, Wales, U.K. Photo: Welsh Gold PLC.
 Plate 1d. Photograph showing the effects of late-stage activity on a pre-existing coarse gold-bearing vein. Overall
Image
Laminated high-grade hangingwall vein with barren spurs, Poverty Reef, Nick...
Published: 01 January 2000
is in Clogau shale (CS) and its hangingwall in greenstone (GS). Location: 40 level (40 feet below 6 level, see Fig. 10 ), Chidlaw Link Zone, Gwynfynydd mine, Wales, U.K. Photo: Welsh Gold PLC.
 Plate 1d. Photograph showing the effects of late-stage activity on a pre-existing coarse gold-bearing vein. Overall
Journal Article
Published: 01 January 2000
Exploration and Mining Geology (2000) 9 (1): 13–42.
...Fig. 10. Composite level plan of the Gwynfynydd mine (Wales, U.K.) Chidlaw Link Zone showing location of major block bounding A-B and C faults, mother vein, gold-bearing footwall vein, stopes and major gold zones (>6 kg Au) between the upper 6 level and lower 110 level. Source: Welsh Gold PLC. ...
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Journal Article
Published: 01 July 2001
Exploration and Mining Geology (2001) 10 (3): 215–233.
... of the distribution. For example, in the Gwynfynydd mine (Wales, United Kingdom) a diamond-drilling program on 15 m centers failed to intersect any high-grade zones. The program was successful in defining the geometry and location of the orebody, but would have required a hole spacing of less than 5 m to resolve...
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Plan of exposure of the entire lode (reef) at 6 level, simplified from <b>mine</b>...
Published: 01 October 2001
Fig. 7. Plan of exposure of the entire lode (reef) at 6 level, simplified from mine plan held by Gwynfynydd Gold Mine Ltd. (Welsh Gold PLC). This section illustrates the site of the gold-bearing footwall zone to the main packages of relatively barren quartz veins. Assays show significant gold
Journal Article
Published: 01 September 1978
Journal of the Geological Society (1978) 135 (5): 583–586.
... Mine, Doigdlan, North Wales J.H. Ashton At the Gwynfynydd mine, gold was won from normal faults filled with large quantifies of white quartz, fragments of wall rock, locally significant quantities of base-metal sul- phides and irregularly distributed patches of gold. Most veins dip 30-60* northwards...
Journal Article
Published: 01 January 2002
Exploration and Mining Geology (2002) 11 (1-4): 119–124.
... . The occurrence of high-grade gold pockets in quartz reefs at the Gwynfynydd Mine, Wales, United Kingdom: A geological explanation of the nugget effect . Exploration and Mining Geology , 10 , p. 249 – 272 . ROBERTS , L.S. , DOMINY , S.C. and NUGUS , M.J. , 2003 . Problems of sampling...
Journal Article
Journal: Economic Geology
Published: 01 December 2000
Economic Geology (2000) 95 (8): 1753–1773.
... Burn, 10 = Cononish, 11 = Glen Lednock, 12 = West Water, 13 = Borland Glen, 14 = Mauchline basin, 15 (shaded area) = Glengaber: Moffatt and Glengap, 16 (shaded area) = Leadhills: Shortcleuch Water, 17 (shaded area) = Galloway: Glenhead and Fore Burn, 18 = Gwynfynydd mine, Dolgellau gold belt, North...
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Journal Article
Journal: Economic Geology
Published: 01 September 2003
Economic Geology (2003) 98 (6): 1257–1268.
... and indirect approaches" by D. Marcotte and A. Boucher —Michel Dagbert 243 The occurrence of high-grade gold pockets in quartz reefs at the Gwynfynydd mine, Wales, United Kingdom: A geological explanation for the nugget effect —Ian M. Platten and Simon C. Dominy 249 Extended weights-of-evidence...
Series: Reviews in Economic Geology
Published: 01 January 2020
DOI: 10.5382/rev.21.01
EISBN: 9781629495798
... of hydrothermal gold mineralization during extension, well below the top 2 km of the crust where epithermal deposits form, are reported from the Dolgelau gold belt in north Wales, where the Clogau-St. Davids (100,000 oz Au produced) and Gwynfynydd (50,000 oz Au) mines are located ( Platten and Dominy, 2009...
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