"The handheld Niton XRF readings were collected by taking...

"The handheld Niton XRF readings were collected by taking measurements through the

   heavy duty  plastic bags that hold the bulk samples for each metre.

Comparisons between previous Maldorky Resource handheld XRF results and

laboratory assay results and between current XRF results and laboratory certified standards directly and through the plastic has shown that the 200 μm thick plastic used in the bulk bags results

in a 10% -20% underestimation of iron results.

No correction factors have been applied to the Niton XRF results reported here, although the above evidence indicates they are likely to be upgraded by the conventional laboratory XRF assays, which will be reported in due course."