Welcome Dennis,
I can't say if it's a GPAA claim, but I can tell you how to get there, I've been there. The only advise I'll give you is the farther you go, the bigger the boulders get until you need a rock climber. So you better have a 4wd. A 2wd can be an issue in the soft sand.
Anyway off of 395, take Garlock Rd. to the Goler Heights area past the landing strip. Take the Goler Gulch dirt rd. Stay along the dirt road that goes along the base of the mountain. Go up the mountain, when the rocks in the road get to be really huge and your trucks oil pan is slammed on a boulder, you've gone too far.
Good luck, have fun.