AC would work on saprolite though although auger probably cheaper if only going down 20 meters as RMI have been doing for about 5 years
http://www.asx.com.au/asxpdf/20170228/pdf/43gdjxgf3phfbz.pdf
page 7
Trial open cut mining planned: ~100Koz pa Au at a conservative 1oz/t Au, page-42
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