Fresh is a common word to use to mean non-oxidized rock below the weathered layer. It is a geo's term.
The one thing I fear from the high grade samples and the low grade bulk is that the zone is spread artificially (by combining the bulk into one one mass) over a wide area, where in reality it may be one narrow richer zone.
And yes, that is commonly why an oxidized sample is higher grade than a fresh rock sample. But the very high differential is suspiciouser still. Sounds like some of those samples were as they say "selected".
Them's the breaks.
My bet is that the entire zone is not pervasively mineralized with gold.
Register for free to join our community of investors and share your ideas. You will also get access to streaming quotes, interactive charts, trades, portfolio, live options flow and more tools.