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Galmoy Mine, Johnstown, Co. Kilkenny, Ireland

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Latitude & Longitude (WGS84): 52° 48' 19'' North , 7° 35' 49'' West
Latitude & Longitude (decimal): 52.80528,-7.59722
GeoHash:G#: gc6s7hgv5
Other regions containing this locality:Ireland (island)
Locality type:Mine (Inactive) - last checked 2018
Köppen climate type:Cfb : Temperate oceanic climate


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 even access to the mine, have been consistently ignored or refused on the grounds that mineral "specimens are the 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


36 valid minerals.

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org

Early Carboniferous
323.2 - 358.9 Ma



ID: 3143524
Dinantian

Age: Mississippian (323.2 - 358.9 Ma)

Lithology: Major:{limestone}, Minor{claystone,sandstone}

Reference: Asch, K. The 1:5M International Geological Map of Europe and Adjacent Areas: Development and Implementation of a GIS-enabled Concept. Geologisches Jahrbuch, SA 3. [147]

Early Carboniferous
323.2 - 358.9 Ma



ID: 3192030
Paleozoic sedimentary rocks

Age: Mississippian (323.2 - 358.9 Ma)

Lithology: Sedimentary rocks

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License



This page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.

References

Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Sullivan, J.R. et al. (2005) A Technical Review of the Galmoy Mine and Prospecting Licences Held by Arcon in the Irish Midlands-republic of Ireland for Lundin Mining Corporation.
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.
Barrie, C.D., Boyce, A.J., Boyle, A.P., Williams, P.J., Blake, K., Wilkinson, J.J., Lowther, M., McDermott, P., and Prior, D.J. (2009) On the growth of colloform textures: A case study of sphalerite from the Galmoy ore body, Ireland. Journal of the Geological Society 166(3), 563-582.

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