Ward has been on the board since 2011 and has seen the company transition from coal explorer to bauxite miner; who in its first year of operation exported 2.0 million tonnes of bauxite product as planned.
His resignation is due to his recent appointment to the board of another listed public company.
Metro’s chairman Stephen Everett said: “Metro’s board, management and I personally wish to thank Lindsay for his support, hard work and tireless efforts during our journey to becoming a bauxite mining company.
“Transitioning from explorer to developer to producer is never easy however having strong leadership at Board level significantly assists with that effort.
“We will miss Lindsay and his contribution to the board and the committees on which he has served.”
Ward also said: “It has been a great privilege to be part of the Metro team which, over the past 7 years, has led Metro’s journey from coal explorer to successful bauxite producer.
“Due to other board commitments I have decided to leave the Metro board however I have every confidence that Metro will continue to deliver on its commitments to shareholders, stakeholders and customers in 2019 and beyond.”