Egan Street managing director Marc Ducler said Hill was needed to make sure Rothsay was looked after, financially.
"It is increasingly clear that Rothsay is going to be a significant WA gold project and therefore we require strong financial management as we push hard to grow the inventory and establish the economic and technical aspects of Rothsay as we lead up to project development," he said.
Egan Street listed last year and, after one further capital raise following the IPO, is aiming to release a feasibility study by the close of the March quarter.