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Lisheen

Ireland

Main commodities: Zn Pb
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The Lisheen carbonate hosted zinc-lead deposit is located in approximately 18 km south-west of the town of Rathdowney in south-central Ireland, and approximately 10 km south-west of the galmoy deposit.

The Lisheen deposit is hosted by lower Carboniferous carbonates within the Rathdowney Trend in central Ireland.  The first discovery of massive sulphide at the prospect was in April 1990.  Within the prospect area there are three main units, the lower Argillaceous Bioclastic Limestone, the Waulsortian Limestone composed of biomicrites, argillites and micrites, and the overlying cherty calcarenites if the Crosspatrick Formation.

The ore is located along the western edge of a broad zone of dolomitisation within the Waulsortian and Crosspatrick Formations along the Rathdowney Trend.  Ferroan dolomite zones over print the dolomitisation and partially envelope, but predate the sulphides.

Massive sulphides are localised immediately above the base of the Waulsortian as a series of stratabound lenses with zones of vein stockworks.  Minor mineralisation extends down into the Argillaceous Bioclastic Limestone as disseminations accompanied by silicification and veining.

Mineralisation is interpreted to represent host rock replacement and open space fill.  A black matrix breccia forms irregular zones, above, below and laterally to massive sulphides.  This breccia is composed of angular to sub-rounded, irregular clasts of dark grey dolostone, set in a very dark grey to black, <1 to 15µm grain sized matrix of ferroan dolomite, non-ferroan dolomite and minor disseminated iron sulphides, with abundant microscopic voids.

The pre-mining resource has been stated (Guven, et al., 2007) at 17.9 Mt @15.8% Zn, 2.6% Pb, although alternative resources at a lower cut-off of 21 Mt @ 12% Zn, 2% Pb have also been published.

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:
Hitzman M W  1995 - Mineralisation in 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 25-61
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
Hitzman M W, O Conner P, Schaffalitzky C, Beaty D W, Allan J R, Thompson T  1993 - Discovery and geology of the Lisheen Zn-Pb-Ag prospect, Rathdowney Trend, Ireland: 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 227-246
Hitzman M W, Redmond P B, Beaty D W  2002 - The Carbonate-hosted Lisheen Zn-Pb-Ag deposit, County Tipperary, Ireland: in    Econ. Geol.   v97 pp 1627-1655
Johnston J D  1999 - Regional fluid flow and the genesis of Irish Carboniferous base metal deposits: in    Mineralium Deposita   v34 pp 571-598
Pannalal S J, Symons DTA and Sangster DF,  2008 - Paleomagnetic Evidence for an Early Permian Age of the Lisheen Zn-Pb Deposit, Ireland : in    Econ. Geol.   v103 pp 1641-1655
Shearley, E., Redmond, P., King, M., Goodman, R.,  1996 - Geological controls on mineralization and dolomitization of the Lisheen Zn-Pb-Ag deposit, Co Tipperary, Ireland: in Strogen, P., Somerville, I.D., Jones, G.L.l., (Eds.), 1996 Recent Advances in Lower Carboniferous Geology Geol. Soc.   Spec. Publ. No. 107 pp. 23-33
Torremans, K., Kyne, R., Doyle, R., Guven, J.F. and Walsh, J.J.,  2018 - Controls on Metal Distributions at the Lisheen and Silvermines Deposits: Insights into Fluid Flow Pathways in Irish-Type Zn-Pb Deposits: in    Econ. Geol.   v.113, pp. 1455-1477
Wilkinson J J  2003 - On diagenesis, dolomitisation and mineralisation in the Irish Zn-Pb orefield: in    Mineralium Deposita   v38 pp 968-983
Wilkinson J J, Eyre S L and Boyce A J  2005 - Ore-Forming Processes in Irish-Type Carbonate-hosted Zn-Pb Deposits: Evidence from Mineralogy, Chemistry and Isotopic Composition of Sulfides at the Lisheen Mine: in    Econ. Geol.   v100 pp 63-86
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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