Curious if any of you use some type of gravity concentration method (panning, sluicing, etc) as part of your hard rock gold prospecting workflow. If yes, please elaborate on how, when and where you use gravity concentration in your process. I've personally had good luck with panning soils on a grid (loaming) at one of my hard rock claims, examining heavies under a loop and/or microscope afterward, doing particle counts and breaking down size factions of the gold.

However, that area has lots of free milling gold that has been liberated from sulfides, making gravity concentration a perfectly viable exploration technique. Also, it's a hobbiest claim; I'm not trying to raise money for diamond drilling, to pump a stock or to option the claim.