That first video...2 weeks of "blood sweat and beers" for over $50,000 in Gold? Not a bad weeks wage if you can find the right spot!
Went out yesterday for a couple of hours near Castlemaine - nothing but a bit of rubbish - few nails, bullets, casings, can, shotgun shell (which was quite deep), etc At least I got a few flakes at Sovereign Hill beforehand ...