Xanadu has now appointed Dr Andrew Stewart as managing director and chief executive officer.
Mark Wheatley, executive chairman, will move to non-executive chairman.
Both changes are effective immediately, and are in line with the company's succession plan.
Stewart commented: "Over the next few months, I will be appointing a highly experienced chief geologist to ensure a seamless transition of the succession plan.
"This will complete a reorganisation of our exploration team in Mongolia to ensure our focus on exploration success continues and will strengthen in-country capacity to support our well-funded ongoing exploration programs across multiple projects.
"My move to Australia will assist with promotion of the company and provide easier and more regular access to important stakeholders and capital investment markets."