There's no standard. It is spot readings with human bias versus impartial composite assays from a lab that are subject to QA. Apples and pears.
Someone could invent a machine where you plug in the very latest Niton and have it slide the core up and down in transects and then maybe you could get something quantitative and within acceptable variance with lab results. But until such a standard exists then best to keep the reference to Nitons along the lines of "mineral X was observed at X% over X metres, and its presence was confirmed by spot XRF readings undertaken in the field.
That is the position the ASX and AusIMM should currently have on Niton's while the technology and methodology is still evolving, and I contributed as such to the review last year. But I note no policy has yet been forthcoming.
What I want to know is which unit are these guys using.
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