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[Aureous]

4 minutes ago, Tom T said:

Would a XRF gun work?

I'm not very familiar with the XRF handheld units, but the Bruker range appears to be able to analyze multiple metals on rock faces without prior grinding. So, on the 'face' of it, thats a YES. Would still need a multi kilo assay done to determine mine-ability though. Determine the width of the ore vein and then channel sample it across the full width.