Ambrose is chief operating officer of Zubair Corporation's energy & logistics division and he will represent shareholder Eclipse Investments LLC on the company’s board.
He replaces Sultan Al-Ghaithi who has stepped down as a non-executive director also with immediate effect.
"We warmly welcome Robert Ambrose to the board of Aminex and look forward to working with him as we, first, seek to complete the Ruvuma farm-out transaction and then progress development of the Ruvuma project as soon as possible,” said chairman John Bell.
“Robert's breadth and depth of experience across the industry will be of great benefit to the company.
“On behalf of the board, we thank Sultan for his contribution to the company over the last two years and wish him well for the future."