The Keel Zn-Pb and Garrycam BaSO4 Deposits, Co. Longford, Ireland
Published:January 01, 1995
E. P. Slowey, M. W. Hitzman, D. W. Beaty, T. B. Thompson, 1995. "The Keel Zn-Pb and Garrycam BaSO4 Deposits, Co. Longford, Ireland", Irish Carbonate-Hosted Zn-Pb Deposits, Kerr Anderson, John Ashton, Garth Earls,, Murray Ritzman, Simon Tear
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The Keel zinc-lead deposit is located on the southern side of a Lower Paleozoic inlier at Keel, County Longford, in the northern portion of the Irish Midlands. The deposit was discovered in 1962 by Rio Tinto Finance and Exploration Ltd during regional reconnaissance stream-sediment sampling. Diamond drilling and underground development established 1.85Mt of indicated and inferred reserves grading 7.71% Zn, 1.04% Pb, 0.12% Cd, 39.6 g/t Ag (Slowey, 1986). Development work on the project was suspended in 1968. Sulfides occur within a fracture stockwork and as disseminations in the Upper Devonian-Lower Carboniferous Old Red Sandstone and the Lower Carboniferous Navan Group carbonate rocks. Subsequent exploration located a stratiform barite - iron sulfide - sphalerite body with minor galena near the base of the Waulsortian limestone at Garry cam, less than 1 km east of the Keel shaft. Garrycam contains 1.35Mt grading 36.14% BaS04, 2.67% Zn, and 0.18% Pb; a higher grade barite zone within the deposit has been identified with 0.63Mt at 65.48% BaS04-
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Irish Carbonate-Hosted Zn-Pb Deposits
This paper describes the stratigraphy, basin evolution, and structural geology of Ireland so that the hydrothermal processes which formed the deposits can be placed in a geological context. Informal regional nomenclature are used throughout this paper to provide a clearer overview, rather than the myriad of existing local formation names (see Jones and Earls, this volume). The stratigraphy, together with series and stage designation and available radiometric ages, is presented in Figure 1.