The HH-XRF results could be overestimated due to a number of factors.
1) Contamination. Usually determined through insertion of blanks.
2) Consistency of what part of the sample is scanned. if there is a mixture of fines and larger rock chips in the one sample bag pending what part of the sample you focus on will give you a different fe%. The precision of these could be measured with field duplicates but again this isn't documented in the JORC table.
3) Accurate measure of the gangue analytes e.g. LOI, SIO2 etc. which have a combined influence on the wt chemistry of the bulk rock and inversely are used to estimate total fe.
4) Insufficient pulverising and splitting not providing a homogenous sample..
Ann: Grants Iron Ore Basin Drilling Commencing Soon, page-27
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