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Garrycam deposit (Keel Mine), Keel, Ballymahon, Co. Longford, Ireland

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Latitude & Longitude (WGS84): 53° 38' 49'' North , 7° 44' 12'' West
Latitude & Longitude (decimal): 53.64722,-7.73694
GeoHash:G#: gcd3pynjs
Locality type:Deposit
Köppen climate type:Cfb : Temperate oceanic climate


MVT-type Pb-Zn(-baryte) deposit.

The site of a modest Zn/Pb prospect which at the time of discovery and on the basis of borehole data, was mistakenly perceived to be a much larger deposit. A shaft and 3 levels were driven but were later found to be sub-economic.

Small, albeit very gemmy, honey blende sphalerite can be found by breaking up tough quartz conglomerate boulders strewn around the site, although most are concentrated under trees and in a flat area of spoil to the north of the site which has been concreted over (several trenches have broken through this capping and spoil is visible in the sidewalls).

On September 20th, 2009, it was discovered that a house has been built on the southern half of the site and the landowner has the intention of building another on the remaining portion, thus destroying whatever is left to be found.

Regions containing this locality

Ireland (island)

Island - 484 mineral species & varietal names listed

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


11 valid minerals.

Detailed Mineral List:

Baryte
Formula: BaSO4
Habit: Tabular
Colour: White/Colourless
Description: Microscopic tabular plates associated with needle quartz and honey blende sphalerite have been found in vuggy quartz conglomerate.
Reference: Barry Flannery (Personal Collection); Singer, D.A., Berger, V.I., and Moring, B.C., (2009), Sediment-hosted zinc-lead deposits of the world; database and grade and tonnage models: U.S. Geological Survey Open-File Report 2009-1252
Chalcopyrite
Formula: CuFeS2
Reference: Singer, D.A., Berger, V.I., and Moring, B.C., (2009), Sediment-hosted zinc-lead deposits of the world; database and grade and tonnage models: U.S. Geological Survey Open-File Report 2009-1252
Dolomite
Formula: CaMg(CO3)2
Habit: Rhombohedral
Colour: White/Tan
Description: Comonnly found lining vugs.
Reference: Barry Flannery (Personal Collection); Singer, D.A., Berger, V.I., and Moring, B.C., (2009), Sediment-hosted zinc-lead deposits of the world; database and grade and tonnage models: U.S. Geological Survey Open-File Report 2009-1252
Freibergite
Formula: Ag6[Cu4Fe2]Sb4S13-x
Colour: Metallic Grey
Description: Known only from ore thin-sections.
Reference: Singer, D.A., Berger, V.I., and Moring, B.C., (2009), Sediment-hosted zinc-lead deposits of the world; database and grade and tonnage models: U.S. Geological Survey Open-File Report 2009-1252
Galena
Formula: PbS
Habit: Cubo-Octahedral
Colour: Metallic Grey
Description: Rarely found but lustrous complex crystals showing a predominantly cubo-octahedral structure have been found associated with honey blende sphalerite.
Reference: Barry Flannery (Personal Collection); Singer, D.A., Berger, V.I., and Moring, B.C., (2009), Sediment-hosted zinc-lead deposits of the world; database and grade and tonnage models: U.S. Geological Survey Open-File Report 2009-1252
Jalpaite
Formula: Ag3CuS2
Description: Known only from ore thin-section. Identified optically and by electron microprobe analysis.
Reference: Patterson, J.M. (1970) Unpub. Ph.D. thesis, University of London.; Morrissey, M.J. et al. (1971) Trans. Inst. Mining Metall., sect. B., 80,174-85.; Ryback, G., Nawaz, R. and Farley, E. (1988) Seventh Supplementary List of British Isles Minerals (Irish). Mineralogical Magazine, vol. 52, n° 365, pp. 267-274.; Singer, D.A., Berger, V.I., and Moring, B.C., (2009) Sediment-hosted zinc-lead deposits of the world; database and grade and tonnage models: U.S. Geological Survey Open-File Report 2009-1252.
Pyrargyrite
Formula: Ag3SbS3
Colour: Metallic Grey
Description: Known only from ore thin-sections.
Reference: Singer, D.A., Berger, V.I., and Moring, B.C., (2009), Sediment-hosted zinc-lead deposits of the world; database and grade and tonnage models: U.S. Geological Survey Open-File Report 2009-1252
Pyrite
Formula: FeS2
Habit: Pyritohedral
Colour: Gold
Description: Tiny pyritohedra on sphalerite or baryte have been found.
Reference: Barry Flannery (personal observation); Singer, D.A., Berger, V.I., and Moring, B.C., (2009), Sediment-hosted zinc-lead deposits of the world; database and grade and tonnage models: U.S. Geological Survey Open-File Report 2009-1252
Quartz
Formula: SiO2
Habit: Prismatic
Colour: Colourless/White
Description: Commonly found as sharp colourless needles in vugs or else as massive crystalline material cementing conglomerate pebbles.
Reference: Barry Flannery (Personal Collection)
Sphalerite
Formula: ZnS
Colour: Honey
Description: Honey blende crystals in vuggy quartz conglomerate is occasionally found.
Reference: Barry Flannery (Personal Collection); Singer, D.A., Berger, V.I., and Moring, B.C., (2009), Sediment-hosted zinc-lead deposits of the world; database and grade and tonnage models: U.S. Geological Survey Open-File Report 2009-1252
Tetrahedrite
Formula: Cu6[Cu4(Fe,Zn)2]Sb4S13
Reference: Singer, D.A., Berger, V.I., and Moring, B.C., (2009), Sediment-hosted zinc-lead deposits of the world; database and grade and tonnage models: U.S. Geological Survey Open-File Report 2009-1252

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
'Chalcopyrite'2.CB.10aCuFeS2
'Freibergite'2.GB.05Ag6[Cu4Fe2]Sb4S13-x
'Galena'2.CD.10PbS
'Jalpaite'2.BA.45Ag3CuS2
'Pyrargyrite'2.GA.05Ag3SbS3
'Pyrite'2.EB.05aFeS2
'Sphalerite'2.CB.05aZnS
'Tetrahedrite'2.GB.05Cu6[Cu4(Fe,Zn)2]Sb4S13
Group 4 - Oxides and Hydroxides
'Quartz'4.DA.05SiO2
Group 5 - Nitrates and Carbonates
'Dolomite'5.AB.10CaMg(CO3)2
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
'Baryte'7.AD.35BaSO4

List of minerals arranged by Dana 8th Edition classification

Group 2 - SULFIDES
AmBnXp, with (m+n):p = 2:1
Jalpaite2.4.4.1Ag3CuS2
AmXp, with m:p = 1:1
Galena2.8.1.1PbS
Sphalerite2.8.2.1ZnS
AmBnXp, with (m+n):p = 1:1
Chalcopyrite2.9.1.1CuFeS2
AmBnXp, with (m+n):p = 1:2
Pyrite2.12.1.1FeS2
Group 3 - SULFOSALTS
3 <ø < 4
Freibergite3.3.6.3Ag6[Cu4Fe2]Sb4S13-x
Tetrahedrite3.3.6.1Cu6[Cu4(Fe,Zn)2]Sb4S13
ø = 3
Pyrargyrite3.4.1.2Ag3SbS3
Group 14 - ANHYDROUS NORMAL CARBONATES
AB(XO3)2
Dolomite14.2.1.1CaMg(CO3)2
Group 28 - ANHYDROUS ACID AND NORMAL SULFATES
AXO4
Baryte28.3.1.1BaSO4
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2

List of minerals for each chemical element

CCarbon
C DolomiteCaMg(CO3)2
OOxygen
O BaryteBaSO4
O DolomiteCaMg(CO3)2
O QuartzSiO2
MgMagnesium
Mg DolomiteCaMg(CO3)2
SiSilicon
Si QuartzSiO2
SSulfur
S BaryteBaSO4
S ChalcopyriteCuFeS2
S FreibergiteAg6[Cu4Fe2]Sb4S13-x
S GalenaPbS
S JalpaiteAg3CuS2
S PyrargyriteAg3SbS3
S PyriteFeS2
S SphaleriteZnS
S TetrahedriteCu6[Cu4(Fe,Zn)2]Sb4S13
CaCalcium
Ca DolomiteCaMg(CO3)2
FeIron
Fe ChalcopyriteCuFeS2
Fe FreibergiteAg6[Cu4Fe2]Sb4S13-x
Fe PyriteFeS2
Fe TetrahedriteCu6[Cu4(Fe,Zn)2]Sb4S13
CuCopper
Cu ChalcopyriteCuFeS2
Cu FreibergiteAg6[Cu4Fe2]Sb4S13-x
Cu JalpaiteAg3CuS2
Cu TetrahedriteCu6[Cu4(Fe,Zn)2]Sb4S13
ZnZinc
Zn SphaleriteZnS
Zn TetrahedriteCu6[Cu4(Fe,Zn)2]Sb4S13
AgSilver
Ag FreibergiteAg6[Cu4Fe2]Sb4S13-x
Ag JalpaiteAg3CuS2
Ag PyrargyriteAg3SbS3
SbAntimony
Sb FreibergiteAg6[Cu4Fe2]Sb4S13-x
Sb PyrargyriteAg3SbS3
Sb TetrahedriteCu6[Cu4(Fe,Zn)2]Sb4S13
BaBarium
Ba BaryteBaSO4
PbLead
Pb GalenaPbS

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

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Slowey, E. P. (1986) The Zn-Pb and Barite Deposits at Keel, Co. Longford. In: Geology and Genesis of Mineral Deposits in Ireland, Edited by Andrew, C. J.; Crowe, R. W. A.; Finlay, S.; Pennell, W. M.; Pyne, J. F., Irish Association for Economic Geology, Cahill Printers, Ireland, 711 p, p. 319 - 330.
Ryback, G., Nawaz, R. and Farley, E. (1988) Seventh Supplementary List of British Isles Minerals (Irish). Mineralogical Magazine, vol. 52, n° 365, pp. 267-274.
Slowey, E.P., Hitzman, M.W., Beaty, D.W., Thompson, T.B. (1995) The Keel Zn-Pb and Garrycam BaSO4 Deposits, Co. Longford, Ireland
in Irish Carbonate-Hosted Zn-Pb Deposits, Commemorating the SEG 75th Anniversary, Guidebook for Field Conference May 13-19, 1995, Edited by Anderson, K.; Ashton, J.; Earls, G.; Tear, S., Guidebook Series, Society of Economic Geologists, Citizen Printing Co. Inc., Fort Collins, Colorado 80521, 21, 296 p, p. 227 - 241.
Ryback, G. and Moreton, S. Microminerals from Ireland, Part 3, The East (Leinster, Cavan and Monaghan): UKJMM, No. 12: 36-41.

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