During the majority of its tenure term, very little field work was conducted on the subject ground. Initially, office studies of available geophysical and open file geological data were performed during 2005 to try to identify possible drilling...
During the majority of its tenure term, very little field work was conducted on the subject ground. Initially, office studies of available geophysical and open file geological data were performed during 2005 to try to identify possible drilling targets. Reprocessing of historic government and company open file aeromagnetic data was done for the entire portfolio of Centrex Metals' SA exploration tenements. Data spacing and quality were variable, which led to some uncertainty in drill target selections. Consequently, in February 2007 a new airborne magnetic, radiometric and digital terrain survey was flown, for 840 line km acquired within EL 3125 at a line spacing of 100 m and a nominal sensor height of 50 m above the ground surface. This survey covered all five West Middleback region tenements, with the survey expenses and data shared between Centrex Metals and Lincoln Minerals. Full details of the 2005 reprocessing and the 2007 survey, and the survey’s data, are available from Envelope 11449. Detailed geological and structural mapping, and outcrop rock chip sampling on EL 4185, occurred during 2009-2010 as part of a larger mapping exercise addressing the entire West Middleback region. New outcrops of the Cooyerdoo Granite and many other rocks were recognised within EL 4185, and follow-up PACE funded collaborative geochronology studies (results are published in Report Book 2011/00003 and discussed herein) revealed additional rocks that were over 3000 million years old. During May 2010, the iron ore - related and modal mineralogical compositions of 19 selected outcrop samples of magnetite-rich BIF, haematite-rich BIF and associated other ironstone bedrock units were determined by laboratory semi-quantitative XRF analysis. No mechanical drilling was undertaken by Centrex Metals or Lincoln Minerals (or SAIOG) within the subject licence area. A hand powered post hole digger was used to bore holes into lakebeds and regolith to ascertain thicknesses of potential detrital iron ores. These holes were backfilled immediately after their contents and layering had been examined.
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