South Africa’s diversified black-controlled mining and minerals company African Rainbow Minerals (ARM) on Tuesday announced that its financial director Abigail Mukhuba would be stepping down with effect from the end of September to pursue a new career, and that ARM senior executive finance: corporate and tax Derrick King had been appointed acting finance director. King was part of the now defunct Anglovaal and continued in the finance department after the Anglovaal takeover by ARM in 2004.