Wilson is currently an independent director of the company.
Jonsson will continue as a director of the company and as company secretary.
Caledonia's president and chief executive officer said: "During the period of Carl's chairmanship, Caledonia has successfully overcome some significant challenges. Carl's assistance and guidance during this time has been invaluable."
Disclosure: I have no positions in any stocks mentioned, and no plans to initiate any positions within the next 72 hours.