for base metals Cu, Pb, Zn, Ni and Sn & W, most geologists will be able to predict the grade within +-30%, usually better. If they are not providing the visually estimated % it is because they don't want us predicting the grade.
Either way, they have found hematite and should just model this up to see if it adequately explains the gravity anomaly. They are running out of room across to that fault to find something big.
Ann: IOCG Wedge Holes Provide Exceptional Visual Sulphides, page-40
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