(*Completed with thanks*)Jupiter Gold Mine

[Nookie]

Jupiter Mine was next door to the Simmer mine in Germiston.  They both went into liquidation in 1920. The Simmer and Jack Mine is now a living museum. At the entrance to Germiston, on the western side, is a fountain in the shape of a mine headgear; the play of the water and brilliant illumination at night contribute to a spectacular effect.

Hope this helps

[Meredith48]

Thanks to everyone who contributed to my search for the Jupiter Mine.  All the info helped me pin the location down - I've just met up with a relative of a relative who lived in Jo-Burg for a few years, and has been able to confirm locatation of the mine - it is just to the west ( maybe south-west) of the Geldenhuys Interchange on the road from Johannesburg to Germiston. 
What an adventure.
thanks, Meredith