Trails around Torpedo Bay near Lake Tinaroo

A while ago I walked the circuit around Torpedo Bay by Lake Tinaroo in the hiking books and found a mess of other trails in the area that are flagged but not signed. There is a map is displayed at a couple of places on the trail indicating the trail goes to Black Mountain (I'd put in a photo of the map here, but I don't know how)
I took the trail to "Black Mountain" and walked for 3 hours (including losing the trail a few times), came by a nice creek, walked and walked, but no end to the trail in sight. Does anyone know where it eventually leads?
I took the trail to "Black Mountain" and walked for 3 hours (including losing the trail a few times), came by a nice creek, walked and walked, but no end to the trail in sight. Does anyone know where it eventually leads?