Ian Cochrane will step down as chair of mining services business Perenti, with the company citing ill health as reason for the decision.
His board experience outside of Perenti has been wide-ranging, having in recent years chaired Wright Prospecting, VOC Group and Dacian Gold.
He is also at present a director of Ardross Group, a position he has held since 2014.
Robert Cole, who serves as Perenti's deputy chair, will now step into the role of chair.
Shares in Perenti were trading at $1 as at 3pm AEST.