In 1994, as the Mandela government came to power, Motsepe left the law firm and struck out on his own, hoping to build a business contracting low-level labor like sweeping, where workers use brooms to glean gold dust from the rock surface after industrial mining crews have done their work.
Brushing the surface of rocks with Curiosity's dust removal tool first enables the arm-held hand lens camera and X-ray spectrometer, in particular, to see features that might otherwise be obstructed.