Bromley will continue his association with Mindax in a consulting role to assist in an orderly transition for the company.
The company last week reached an agreement with non-executive director Andrew Tsang, who lodged a Section 249D notice on 5 March.
Tsang has now withdrawn his 249D Notice as a result of the changes to the board.
The rest of the board membership remains unchanged.
Gilbert George, Mindax chairman, said:
"I wish to acknowledge Greg's leadership over the past 8 years - where he has guided the company from its inception to the point where it has two projects - both developed from greenfields prospects to become significant discoveries.
"In the last two and a half years the Mt Forrest Project has grown from nothing to a 1.4 billion tonne resource at a discovery cost of around 1 cent per tonne, while the uranium resource was developed from first principles, andMindax has a significant holding in this new province.
"I wish Greg all the best in his future endeavours and on behalf of the board thank him for his significant contribution - both to Mindax and to the industry in the Yilgarn where his chairmanship of the Yilgarn Iron Producers Association has raised awareness of the region as one deserving of strong Government infrastructure support."
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