Picked up some rock samples a while ago, probably a year or 2, crushed a few through the mini crusher and ran it through a sluice and got some small specks of gold. But it wasn't heaps, and the rest of the rocks have just sat around home all that time. Just looking at them today in the sunlight, and this one looked like I could see gold visible in it with the naked eye. Had a look through the magnifier and it looks like gold: