I went to a couple of claims listed in hte GPAA Mining Guide a couple of years ago. 1 claim was no longer GPAA owned. I went to another spot in the National Forest and found a couple of claims that were taken, but further down teh creek there was a place where people panned. I will say this. i spent ALL DAY and didn't find much much less black sands in the creek with all the slate rock all in the creek bed. Pretty hard to dig around in it. Some peices of slate was from small size pick up with your hands to 3-4ft big peices. I also went to a place 5 miles from Sturgis and really couldn't find it hence the reason I went into the National Forest.
Of course all I had was pans, buckets, and a shovel!
I am sure if one spends enough time there they should find some stuff, but my experience with the creeks there, A LOT OF SLATE!!!!!