"Mr Lamming will enter into a six-month consulting agreement to provide his services to the company ensuring continuity and an orderly handover," chairperson Brian Moritz said in a statement on Monday.
"Mr Visagie, in his capacity as financial director since the company's admission to AIM in July 2006, has been instrumental in the growth of Goldplat and is well suited to lead the company in the interim."
AIM is the London Stock Exchange's international market for smaller growing companies.
Moritz said Goldplat was now seeking to find a South African-based chief executive, who would be ideally suited geographically to guide the African-focused gold company through the next phase of its "evolution", as it looked to build its market-leading gold recovery position in Africa.
"We'd like to thank Russell for all his efforts in helping us develop the company. Now that we are focusing more on the recovery business, I believe we stand to benefit from having a South African-based chief executive as we move to our next stage of development," he said. – Sapa