[2] In September 1870 the government appointed Truter Commissioner and Inspector General for the diamond fields south of the Orange River.
This was in the aftermath of the Conference of Nooitgedacht concerning ownership of the diamond fields around Kimberley and Truter was chosen for the job because of his political experience and negotiation skills.
Despite his diligence and the trust he received from the diggers, Truter could not avoid that the British annexed the area as Griqualand West by proclamation of 27 October 1871.
[2][3] On 21 July 1872 the government appointed Truter Landdrost of Bloemfontein in which position he was also an official member of the Executive Council (Uitvoerende Raad) of the republic.
In 1879 Truter was temporarily appointed Government Secretary, after the sudden death of the incumbent F. Kaufmann Höhne on 19 April of that year.