Its not pyrite, thats for sure. Pyrite causes serious issues, like the fact its highly flammable when in dust form and we have to take precautions like install water sprayers when we blast. I heard some stories where its caused fires.
But yeh, its some nice high grade samples from about 1.5km underground..... most of the dirt that gets refined is usually only 3-5% grade per tonne which is good.
As for selling it, no chance really. Last thing I wanna get caught doing that!!!! So it'll sit in the draw I guess.