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Economic Geology; October 1965; v. 60; no. 6; p. 1218-1237
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The Northgate base-metal deposit at Tynagh, County Galway, Ireland; a preliminary geological study

D. R. Derry, G. R. Clark, and N. Gillatt

Primary sulfide ore, containing galena, sphalerite, pyrite, subordinate chalcopyrite and tetrahedrite, and a few ounces of silver per ton, underlies a body of black sulfide mud of supergene origin. In the primary ore, which occurs as layers and lenses in a reef facies of Mississippian limestone, a 'coincidence of volcanic ash, reef conditions, iron formation and sulfides is believed significant, and the origin of the ore is not satisfactorily explained by conventional hydrothermal processes. An origin for both sulfides and iron formation by solfataric solutions during local vulcanicity is suggested."

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