Hand Augering for acid sulfate soils close to Melbourne. Note the grey and black layering typical in the soils from this environment . Often there may be layers of shell (sometimes up to 70%) within the profile. Hand augering to 4-5 m was quite common during this study.
Above is an extract from
http://vro.agriculture.vic.gov.au/dpi/vro/vrosite.nsf/pages/soil_acid_sulfate_soils
Auguring down to 4-5 metres as explained in the article will not test into the zone through which the tunnels are drilled.
Agricultural analysis is not mining analysis.
Nanu
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