Contrygal,
The place I recommend is working the dry gulch directly below (to the South) of the old Granite Cemetery.
The cemetery is on County Road 398D just off CR 398.
Park there at the cemetery, walk around the cemetery and down the hill to Cache Creek. Directly to the South you'll see a small dry ravine/gulch zig sagging up from the creek. Walk up it a couple zigs & zags, maybe about 40 yards or so and dig material from the decomposing granite bedrock to about a foot up. Should look like a little orangish, compacted clay & gravels. Will need a pick to dig it. Pan & sluice that material.
Remember, you're at about 9,200 feet elevation, so the air is thin on oxygen. Walking down the hill is easy. I take 4 or 5 little rest breaks walking back up the hill to the parking lot. I recommend folks take 1 aspirin every morning, drink lots of water and take it easy to avoid altitude sickness from overexertion/dehydration. Especially if you're a lowlander.
The 2,160 acre Cache Creek property is all open land.............not open to claiming...........so no worries on others' claims there. Avoid the 1 active claim well below down stream from the cemetery, on the right hand side of the creek, that's the South side. IF you get that far down, a good 1/4 mile or so, you'll see the monuments & claim signs. Also, the BLM Elephant Rock campground area on CR 371 a couple miles North of Buena Vista is open for panning & sluicing on the Arkansas River. You can prospect about 100 yards downriver and 1/4 mile up river.
Here's 2 maps of Cache Creek that might help. The cemetery is the first circled loop in the middle of the Google Earth view and the up creek "placering area" parking lot is the second circled loop:
HTH,
Randy "C-17A"