BRIEF-AngloGold Ashanti Chairman Tito Mboweni steps down

JOHANNESBURG, Feb 17 (Reuters) - AngloGold Ashanti Ltd ANGJ.J :

* Says Mboweni has stood down as chairman today

* Tito Mboweni has decided not to stand for re-election as non-executive director at the annual general meeting

* Says Sipho Pityana, who was elected unanimously by the board today

* Says Sipho Pityana, who was elected unanimously by the board today as chairman

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