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Galmoy

Ireland

Main commodities: Zn Pb
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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 summary 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.


  References & Additional Information
   Selected References:
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
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
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
Wilkinson J J  2003 - On diagenesis, dolomitisation and mineralisation in the Irish Zn-Pb orefield: in    Mineralium Deposita   v38 pp 968-983
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


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 takes no responsibility what-so-ever for inaccurate or out of date data, information or interpretations.

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