I believe (And most probably naively, but will debate it none the less) that there would be places where there are large deposit. If there were previously there still would be today, despite the good going over the place has had. Fact is, we have large gold bearing areas and while the "stuff on top" has been scooped up, not everywhere has been picked over. With modern equipment and techniques I am CERTAIN there is more to be found. Imagine this, the number/amounts of nuggets and color sitting in cervices just waiting to be sniped or the areas in remote locations where the rivers have deviated over time leaving large deposits still yet undiscovered. The crux of the whole scenario is: How the frick do you get to it (location remoteness, overburden, permitting, licensing, etc... We all know... Gold is where you find it. Also, there was a source for all this lovely mineral, wheres that?
People are stumbling across massive nuggets in OZ on a semi regular basis (if you go on a fact that some finds are reported and the majority are not)
https://www.youtube.com/watch?v=wiAnhfZ9HKI Now I know Oz is a vast and remote place but this 177 ouncer was found super close to civilization. NZ might be slightly different, but one thing is consistent, both countries are gold bearing, so there is hope that similar scenarios are possible here.
Now, can you rock up somewhere and start a hole and find a few pounds per day (By hand)... Hmmmm maybe not... can you rock up and start a hole and find a few ounces per day (By hand)... Hmmmm quite possibly.... Can you rock up somewhere and find a few grams per day (By hand)... Hmmmm bloody oath you can... and there are many combinations of the above, depending on location, equipment, season etc...
Tell me, if you could successfully and economically dredge the sea shelf around the west coast for instance, what do you think would be there? I bet there a ton of the stuff that's been washed down the rivers and into the ocean sitting there... now is it as accessible as what you see on the TV show "Bering Sea Gold" nope, but that doesn't mean its not there.
Anyway, I love the fact that if I do some homework and gain some experience (the more the better) I still hold onto the simple fact that I could find an amount of it reflective of my commitment, luck and skill... Plus I just love doing it, and that's worth gold in itself.
Rant Over... time for rebuttals.