Been in the Congress/Rich Hill area detecting a couple of times. My buddy found some incredible specimen gold, and another friend of mine got some very nice nuggets. We detected along the tops of hills that ran down into big washes. We joined some clubs and had lots of ground to detect on. Terry has given you some solid advice about the best way to go about it. So, buy some memberships and then you don't have to worry about getting chased off someone else's claim or worse. You'll be able to relax and enjoy yourself. If you can hook up with a local that belongs to one of the clubs that can go with you for a day or two--that's even better.
The gold can be just about anywhere out there, and there's a huge wide-open country all around you. Don't be afraid to try places that seem to obvious--a couple of my buddies there detected the actual track of a trail and hit a huge find of specimen gold and nuggets--it was incredible. I have the pictures to prove it, and I saw it. As well, they detected, while I was there detecting with them, the margins of the trail out into the desert proper and found big chunks of specimen (gold and quartz). All of this while I was down in washes hammering along where the water had run--they got the gold.
I've also detected in the Gold Basin area with a good friend of mine that had permission to hunt some claims there. He put me in a spot filled with old dry-wash piles and told me he'd always intended to get around to detecting it. So, I tried it for a while--got lots of trash, so I headed off to detect some washes across the main big wash. A while later he yelled and called me back. He had a gorgeous nugget he'd dug from one of the very dry-wash piles he'd been trying to get me to focus on. So, I learned my lesson the hard way--if you're lucky enough to get a local to take you, spend some very, very serious time hammering any area they say is special or that they've always wanted to hunt.
All the best--the desert has its own unique, haunting beauty--nothing like Canada at all--everything has spines, pokes you, or bites, so be very careful as well,
Lanny