The discovery of gold at Tati led President Pretorius in April 1868 to issue a proclamation extending his territories on the west and north so as to embrace the goldfield and all Efforts Bechuanaland.
The Sand River Convention of 1852 had not defined the western border of the state, and the discovery of gold at Tati to the northwest, together with the discovery of diamonds on the Vaal in 1867, offered Pretorius every inducement to extend his boundary.
Administratively attached to the protectorate is the Tati concession, which covers 2500 sq.
The last named is the chief township in the Tati concession, the centre of a gold-mining region, and the most important white settlement in the protectorate.
Gold mines are worked in the Tati district, the first discoveries having been made there in 1864.
In 1864 Karl Mauch discovered gold in the Tati district.