UPDATE: Several people pointed out that the map was oriented wrongly. I think I’ve corrected it now, but please feel free to correct it yourself (.kmz file), and send me a more accurate version! Incorrect version was here.
Here’s the map of the Blackheath Cavern from 1946 (mentioned in the previous post) overlaid onto Google Earth. I couldn’t work out how to get it into Google Maps unfortunately. Zoomed out version below (old map is in the top left corner, village is at the bottom).