Wang, who previously worked for Jiangxi Copper in Shenzhen, spent 2-1/2 years in the raw materials department at China Copper, a major smelter that is a unit of state-run metals group Chinalco.
He joined Gerald last week, said the sources, who declined to be named as they were not authorised to speak to the media.
London-based Gerald did not immediately respond to a request for comment.
(Reporting by Tom Daly; editing by Jason Neely)
