the pictures are under a USB microscope at 20X to 200X. it looks like copper but im not positive. I have about 10 pieces some bigger some smaller.
had to throw the last one in there to show what my gold cube is expecting me to pan. That stuff is tiny.....pics at 250X
Try taking a small bit and having it tested at the pawn shop, that or sacrifice a small bit to nitric acid and see if it sticks around. Be neat if it was wire gold.
Nokta FoRs Gold, a Gold Cube, 2 Keene Sluices and Lord only knows how many pans....not to mention a load of other gear my wife still doesn't know about!