You can reach the area from Rio Acima town, going through the Gandarela Mountain or from Santa Barbara. Actually, the location belongs to Santa Barbara town. In the rainy season, I wouldn't try it on a normal vehicle.
Take a good camera with you as the scenery is wonderful also on the way to the geocache. If you come from Santa Barbara, take your time to visit Caraça.
I found this location by chance when I was trying to reach Caraça from Rio Acima on a 4x4.