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Investigation of stratiform sulphide mineralisation at Meall Mor, South Knapdale, Argyll

By C.G. Smith, W.G. McCourt, N.J. Fortey, C.E. Johnson, M.E. Parker, J.S. Coats and U. McLMichie

Abstract

A co-ordinated geochemical-geophysical-geological investigation of copper\ud mineralisation in the Meal1 ?46r area, South Knapdale, Argyll was carried 0th\ud in 1976 and followed by a drilling programme of 3 shallow holes in early 1977.\ud The mineralisation occursin a zone of weak stratiform sulphide mineralisation\ud (the pyrite zone) with a strike length of 1Okm in the Upper &ins Quartz&e\ud of the Middle Dalradian.\ud The geochemical drainage survey showed the existence of a strongly anomalous\ud distribution of Cu and Sb in the Abhainn Srathain draining south from .\ud Meal1 M&- and detailed soil sampling over the pyrite zone outlined a broad\ud area enriched in copper. Deeper soil sampling confirmed the anomalously\ud high copper values and a coincident IP anomaly was found stretching from\ud Meal1 M& south to the old mine workings on Abhainn Srathain, and is probably\ud caused by a local enrichment of pyrite and chalcopyrite within the pyrite\ud zone.\ud Three boreholes were drilled; two on coincident geochemical and geophysical\ud anomalies, and the third beneath the old mines at Abhainn Srathain. Copper\ud values in the first two holes range up to 0.24% Cu over 4.27m, but up to\ud 1.06% Cu over 2.67m in the third and this enrichment may be related to a\ud later remobilisation of the disseminated chalcopyrite. The results of subsequent\ud drilling at two other sites are given in Appendix III

Publisher: Institute of Geological Sciences
Year: 1978
OAI identifier: oai:nora.nerc.ac.uk:10669

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