18 September 1924
It is widely accepted that the gold reef on the Witwatersrand was discovered by George Harrison. What has always been disputed is that English born, George Walker discovered it with him. Both men had their own version of how they found the gold reef, but only Harrison’s version of events was supported by evidence. Walker died on 18 September 1924 in Krugersdorp. With his claims disputed, he was never recognized as the co-founder of the reef and died impoverished.
References

Joburg Three Georges strike paydirt[online] Available at: www.joburg.org.za[Accessed on 6 September 2013]|

Gauteng Blaauwbank Historic Gold Mine and Resort[online] Available at: www.gauteng.net[Accessed on 6 September 2013]