With all due respect, the only way to "know exactly what they have in those drill cores" is by sampling and having the samples sent to an accredited analytical laboratory for analysis. The geologist logging the core makes a judgement as to what will be sampled and what elements the samples will be analyzed for. A hand-held, portable analyzer is used only to provide a "rough" estimate of some elements present. I do not believe that the particular instrument(s) currently in use by NOT is(are) able to detect/measure more than a few elements in situ in the field......probably Ni and Cr........but I'm not certain about the range of elements.
There is a school of thought, amongst analysts and companies alike, that "visuals" should not be released alone as they can be easily manipulated in a variety of ways leading to incorrect conclusions by many investors.
Respectfully submitted
geoprof