Was out looking for boulders today out the back of Sand River (didn't find much), but did spot this sick looking orange wall that I'm unlikely to develop so I thought I would record it's location for posterity.
If Forestry gave out the key to the gate (they don't - I've previously asked - they say they won't because you can get into the army range from this road), this would only be a ~300m walk from the road, but instead it's ~5km from the gate, with a decent bit of uphill at the start. Maybe 25 minutes on an e-bike. Or even better a motor bike.
There is more rock in this valley, but didn't spot anything anywhere near as good. Upstream there is grey rock near the creek (canyon) but it's a bit vegetated. You can see some more orange stuff at the mouth of the valley just to the south of Justin's place on the way out from Sand River, but it's (probably) on private land. But if anyone develops this it would be definitely worth exploring downstream to the boundary of the public land.