High Bluff. Progress reports and final report to licence full surrender, for the period 9/1/1978 to 23/2/1985.
Created: 11 Nov 2024
Revised: 11 Nov 2024
Author: Dunn, P.R.;Craven, B.;Slade, J.;Webb, R.J.;Pontifex, I.R.;Alter, H.W.;Davidson, G.J.;Fander, H.W.
Exploration for possible Alligator Rivers (Northern Territory) style uranium deposits occurring in potential host rocks (carbonaceous pelites and carbonate rocks) within an Early Proterozoic metasedimentary sequence underlying a Middle Proterozoic...
Exploration for possible Alligator Rivers (Northern Territory) style uranium deposits occurring in potential host rocks (carbonaceous pelites and carbonate rocks) within an Early Proterozoic metasedimentary sequence underlying a Middle Proterozoic unconformity, across an area of the western Cleve Uplands on eastern Eyre Peninsula, has included a detailed low level helicopter radioactivity survey and detailed geological mapping (1:10,000 scale). 6 areas were selected for detailed ground follow-up work which included 7 percussion drillholes (total 1150 m) and 863 RAB drillholes (total 6253 m) that tested nearly 70 anomalies, but no encouraging uranium mineralisation was intersected (best values 100-350 ppm U3O8 in Hutchison Group metasediments and lateritic ironstone cappings to basement granitoids). All of the radiometric anomalies investigated were found to be mainly due to the presence of thorium with lesser amounts of uranium. Subsequent exploration for Broken Hill style Cu-Pb-Zn stratiform targets in the Lower and Upper Middleback Jaspilites, within an overturned regional scale anticline in the Middleback Subgroup, comprised interpretation of airborne magnetic data, inspection of old mine workings, ground magnetic and Sirotem surveys, and RAB drilling (431 holes totalling 5345 m). Anomalous zinc-bearing pyritic gossanous zones to 1980 ppm Zn detected in Hutchison Group ironstone and calc-silicate horizons at the Stanley mine were considered not widespread enough to warrant further work.
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