Thought maybe it was aluminum.. remains of a pump house a bit further up.
Don't listen to those kill-joy folks like semtav, cfmct, and CT-curt : Those are platinum nuggets ! They just want to raid your site and find more platinum for themselves ! Sssshhhh, don't tell them you're on to their dirty little tricks!
that stuff is also great for nosy people who want to know what you're finding. i know of more than a few people (kids mainly) who have left the beach with a nice shiny "silver nugget" in their hand, courtesy of the treasure hunter.
Read a newspaper article about a house burning down that had silver coins stashed away. These coins melted into blobs. I usually bring home these that are heavy (not aluminum) and test them with metal test kit solutions to be sure they aren't silver or platinum. You just never know, until you do know.
... These coins melted into blobs. ....
... I figured it wouldn't hurt it bring them back and test!....