London-based Philip Haydn-Slater has been appointed non-executive director of ADX Energy.
Tim Maclean has been appointed to a newly created role of chief operating officer at Australian Mines to support the company through its transition to project developer.
Simon Wilkinson has been appointed chief technology officer of Dragontail Systems, and will be based in the company's new research & development facility in Melbourne.
Tim Goldsmith has been appointed chair of Hazer Group, replacing Rick Hopkins who has stepped down after joining the board since the company's inception in 2010. Mr Goldsmith was a partner at PwC for over 20 years and has decades of leadership experience in the mining sector.