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August Simmer and John Jack, c. 1889
Simmer and Jack Mines Ltd (until 1924 known as The Simmer & Jack Gold Mining Co. Ltd.) is a South African company which was founded in 1887 by the German August Simmer and Scotsman John Jack, shortly thereafter selling the majority shareholding to Gold Fields of South Africa Ltd. The company was listed until 2013 at the Johannesburg Stock Exchange.