Oct 16 (Reuters) - Valence Industries Ltd VXL.AX :
* Managing director appointment VXL.AX
* Says Christopher Darby has decided to resign as managing director and CEO of Valence Industries
* Says Robert Mencel will be appointed managing director effective 1 December 2015
* Says Robert Mencel, will be appointed deputy managing director effective 19 October and will join the company's board
* Source text for Eikon ID:nASX61gjKD