RC drill should be able to drill 300-500m depending on the soil.
So I am stumped , they would have put the probe down on the earlier holes and known what was there
so why not do a extra 100m or so on the next few ,just to dip a wick into the new conductive feature, which commences 250m below surface. The rig was there and a extra 100m would have been 24hrs tops.
Im just a google geo anyway what would I know !! lol
Ann: St George Steps Up Drilling at Mt Alexander, page-32
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