Austal Ltd John Rothwell has stepped down from executive duties to become non-executive chairman. The role of managing director and CEO is to be assumed by the president and CEO of Austal USA, Bob Browning. Australian Wine Holdings Ltd Robert Brown has resigned as director. Avonlea Minerals Ltd David Riekie has been appointed managing director. Centamin Egypt Ltd Trevor Schultz has been appointed executive director. Clough Ltd Ross Kelly has retired from the board of directors. Colonial Resources Ltd The management services agreement engaging Mark Christian Hansen as company executive technical director has been terminated. Mr Hansen remains non-executive director. Dynasty Metals Australia Ltd Garry Hemming has resigned as non-executive director. Impress Energy Ltd Doug Jendry has resigned as non-executive director. Liberty Resources Ltd Executive directors Stephen Shelton and Marina Watts are to retire and be replaced by Andrew Haythorpe and Alan Phillips as managing director and non-executive director respectively. Mermaid Marine Australia Ltd Company secretary and chief financial officer Peter Raynor will hand over his company secretary duties to Dylan Darbyshire-Roberts. Navigator Resources Ltd Following the resignation of Tim Sugden, Gordon Galt has been appointed non-executive director. Paladio Group Ltd Leonard Troncone has resigned as company secretary and chief financial officer. Pearl Healthcare Ltd Louis Niederer has resigned from the board while Peter Stirling has joined. Current board chairman Greg Plummer will assume the additional responsibility of chief executive officer, thus becoming executive chairman until the next annual general meeting. Doug Surmon has been appointed chief operating officer. Paul Niederer has stepped down as chief executive officer but will remain non executive officer. Riversdale Mining Ltd Steve Mallyon has been appointed managing director. Sylvania Resources Ltd John Cooke has been appointed non-executive director and replaces non executive chairman Richard Rossiter as chairman of the board’s audit committee. His appointment follows the resignation of chief operating officer and executive director, Evan Kirby. Vital Metals Ltd Peter Knowles has been appointed non-executive director. Western Uranium Ltd The management services agreement engaging Mark Christian Hansen as company executive technical director has been terminated. Mr Hansen remains non-executive director. Westonia Mines Ltd Nigel Johnson has been appointed non-executive director.