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Galmoy Mine, Johnstown, Co. Kilkenny, Ireland
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Calcite
Galmoy Mine, Johnstown, Co. Kilkenny, Ireland

Photo: SRW 2006
Latitude: 52°48'19"N
Longitude: 7°35'50"W
 
 
A lead-zinc underground mine.
The orebody, in Lower Carboniferous rocks, was discovered in the 1960's when significant soil geochemical anomalies were found. More surveys were conducted in the 1980's and finally mineralization was found.
The mine began production in 1997 and various satellite orebodies have been found.
The ore is breccia-hosted and forms, generally stratabound lenses of predominantly massive sulphides consisting of sphalerite, Ag-bearing galena and pyrite/marcasite.
'Room and pillar' extraction methods are used and unfortunately backfilling as well making collecting difficult.
Requests to the geology department for specimens, or access, were consistently ignored, or refused on the grounds that mineral specimens are "property of the company" and cannot be allowed off site. A policy strongly defended by the chief geologist. They seem to have had no interest in preserving their natural mineralogical heritage for future generations.
The mine closed in summer 2009, but reopened shortly after to permit removal of some remaining high grade ore for processing at the nearby Lisheen mine. Of the three modern Irish zinc mines (Galmoy, Lisheen and Tara) Galmoy was the best for vugs and crystallised material, but for the aforementioned reasons almost nothing has been saved. The few pieces obtained from employees indicate that this mine may have been the greatest Irish mineralogical treasure trove since Silvermines.

Mineral List

Anglesite
Anhydrite
Baryte
Boyleite
Calcite
Cerussite
Chalcopyrite
Copiapite
Dolomite
Galena
Goethite
Gypsum
Hematite
Hydrozincite
Jarosite
Lepidocrocite
Marcasite
Muscovite
var: Illite

Nontronite
Proustite
Pyrite
Quartz
Rozenite
Smithsonite
Sphalerite
Strontianite
'Tennantite-Tetrahedrite Series'
Willemite ?


28 entries listed. 26 valid minerals.

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References

- Balassone, G., Rossi, M., Boni, M., Stanley, G., and McDermott, P. (2008): Mineralogical and geochemical characterization of nonsulfide Zn–Pb mineralization at Silvermines and Galmoy (Irish Midlands). Ore Geology Reviews 33, 168-186.

- http://www.arcon.ie/s/GalmoyMine.asp [Link Broken? May 2014]
- http://www.lundinmining.com/galmoy/index.php [Link Broken? May 2014]
- http://www.mining-technology.com/projects/galmoy/

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Copyright © Jolyon Ralph and Ida Chau 1993-2014. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of thousands of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
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