Gindalbie Metals managing director Dale Harris has been moved across to become chief executive at 48 per cent-owned Mid-West magnetite producer Karara Mining.
Mr Harris will replace acting chief executive Paul Sims to oversee the clearing of bottlenecks and ramp up production at the Chinese-controlled Karara project.
"We have every confidence in Dale's ability to oversee this process given the insights that he has gained into the Karara project since joining Gindalbie last year and his own extensive experience in managing large-scale iron ore operations," Gindalbie chairman Keith Jones said.
Mr Harris will be replaced at Gindalbie by Michael O'Neill as acting managing director. Mr O'Neill has been a director of the company for eight years.
The company said Mr Sims, who had previously been Karara's chief financial officer, had decided to resign. He would remain an employee until July.
"While a great deal has been achieved in establishing the Karara project, the board of Gindalbie acknowledges and shares the disappointment felt by shareholders in the ongoing delays in the ramp-up of the concentrator," Mr Jones said.
"However, the board remains firmly committed to working closely with Ansteel to resolve the outstanding technical issues and to achieve nameplate production levels as soon as possible."
China's Ansteel owns 52 per cent of the project.