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Galmoy |
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Ireland |
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Zn Pb
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Super Porphyry Cu and Au
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IOCG Deposits - 70 papers
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All papers now Open Access.
Available as Full Text for direct download or on request. |
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The Galmoy
ore body had an original proven + probable reserve of 6.5 mt
@ 12.9% Zn, 1.26% Pb. It is hosted by lower Carboniferous
carbonates of the Waulsortian Limestone on the Rathdowney Trend
in central Ireland, and is approximately 10 km to the north-east
of Lisheen. The zinc-lead sulphide mineralisation is hosted
by a grey rock matrix breccia within the Waulsortian Limestone,
which at Galmoy is dolomitised throughout. This breccia
is localised stratigraphically, generally commencing within 1
m of the base of the Waulsortian, and has limited lateral extent
regionally. It is composed almost entirely of sub-rounded
to sub-angular clasts of dolomite in a dark grey, fine grained
dolomitic and argillaceous matrix. There are two main orebodies,
the 700x450x6 m CW-Orebody, and the 450x300x8 m G-Orebody.
There are no significant faults in the vicinity of the CW-Orebody,
although the G-Orebody is truncated and displaced by an east-west
normal fault. The stratabound massive sulphides are underlain
by a zone of Cu-Ag mineralisation. Within the main sulphide
bands, pale to buff sphalerite and galena occurs as fracture
and void fill sulphides, accompanied by sulphide replacement
of the host carbonates along clast boundaries and vein margins.
The sphalerite-galena lenses pass gradationally up into a pyrite-marcasite
cap which has a sharp upper margin where it has become massive
sulphides. The Galmoy mine is operated by Arcon Mines Limited.
The most recent source geological information used to prepare this decription was dated: 2001.
This description is a summary from published sources, the chief of which are listed below.
© Copyright Porter GeoConsultancy Pty Ltd. Unauthorised copying, reproduction, storage or dissemination prohibited.
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Doyle E, Bowden A A 1995 - Field guide to the Galmoy zinc-lead deposits, Co. Kilkenny: in Anderson K, Ashton J, Earls G, Hitzman M, Tear S (Eds.), Irish Carbonate Hosted Zn-Pb Deposits SEG Guidebook Series, Littleton, Colorado, USA v21 pp 139-145
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Doyle E, Bowden A A, Jones G V, Stanley G A 1993 - The geology of the Galmoy zinc-lead deposits, Co. Kilkenny: in Bowden A A, Earls G, O Connor P G, Pyne J F (Eds.), The Irish Minerals Industry 1980-1990 Irish Association for Economic Geology, Dublin pp 211-225
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Hitzman M W 1995 - Geological setting of the Irish Zn-Pb-(Ba-Ag) Orefield: in Anderson K, Ashton J, Earls G, Hitzman M, Tear S (Eds.), Irish Carbonate Hosted Zn-Pb Deposits SEG Guidebook Series, Littleton, Colorado, USA v21 pp 3-23
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Wilkinson J J 2003 - On diagenesis, dolomitisation and mineralisation in the Irish Zn-Pb orefield: in Mineralium Deposita v38 pp 968-983
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Wilkinson JJ, 2010 - A Review of Fluid Inclusion Constraints on Mineralization in the Irish Ore Field and Implications for the Genesis of Sediment-Hosted Zn-Pb Deposits : in Econ. Geol. v105 pp. 417-442
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Porter GeoConsultancy Pty Ltd (PorterGeo) provides access to this database at no charge. It is largely based on scientific papers and reports in the public domain, and was current when the sources consulted were published. While PorterGeo endeavour to ensure the information was accurate at the time of compilation and subsequent updating, PorterGeo, its employees and servants: i). do not warrant, or make any representation regarding the use, or results of the use of the information contained herein as to its correctness, accuracy, currency, or otherwise; and ii). expressly disclaim all liability or responsibility to any person using the information or conclusions contained herein.
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