Don't know for sure, but the history of my town (Montville 07045) tells of a Gold mine in town that sold shares, but never was developed. It has always been assumed that it was a "salted" mine and that the whole thing was a scam, but I remember seeing printed info on the old story. Also once heard from an old timer, now dead, that he once found some native silver in one of the town's streams when he was a kid, he had a lot of stories, so I always took that one with a few grains of salt as it were. Lots of mining up here in Northern NJ, but most of it was for iron, I have a lot of chunks of Magnetite that I have picked up around old mine sites when Hiking and keep my eye out for mineralization, but so far I have only seen Iron. There is also a story of an old Copper mine in Bergen county which I know to be true. If copper has been found in Northern NJ, I suspect that Gold is a possibility, but as law happy as this state seems to be, if you found any, what would be the chance that you would be allowed to get it out of the ground