town 58 km south-west of rustenburg and 72 km west-north-west of magaliesburg. it was founded on the farm kleinfontein in 1913, and has been administered by a village council since january 1931. said to have been named either after dr herman jacob coster (1866-1899), state attorney of the south african republic, after its surveyor, or after bastiaan hendricus koster, owner of the farm kleinfontein. the latter explanation seems most plausible.