No they cannot - you can gauge the content of the pyrite in %age terms - 30% fgp (fine-grained pyrite) will usually be a good sign but can also be barren while v.g. (visible gold) can look sensational and comeback sub-economic. In the case of EXS, if the core contains mineralization similar to previously-assayed core, complete with the banding and quartz-veining, it should be a positive outcome.
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