Unused older card JSPC 31 showing a view of Mine Dumps from Harrow Road.  These dumps have an interesting background story, as many Google entries reveal, including this:  “During gold mining, underground tunnels were created to extract ore and crushed rock waste, with gold processing residues being deposited at ground level, which led to the formation of substantial mine dumps and tailing dams in Johannesburg. These underground tunnels, dumps and tailings cover a large footprint.”  There’s so much more to be said, including accounts of radioactivity and also that some gold may remain.  Grade: 1