London Mining has pulled eight employees out of its Marampa Mine after an outbreak of Ebola virus.
London Mining said that no cases of Ebola had been reported in communities around the iron ore mine, and that production had not been affected.
However, the company has said that staff who can work remotely will not return to the country, as a precautionary measure in line with standard operating procedure.
Operations personnel have remained in the country.
An outbreak of the Ebola virus began in March in Guinea, resulting in international mining staff being evacuated and closure of international borders.
Reuters has reported that so far there have been five Ebola deaths in Sierra Leone, and about 185 people have died of the disease in Guinea and Liberia.
London Mining began production at Marampa in December 2011, achieving the target of 1.6 million wet metric tonnes (Mwmt) in 2012. Marampa’s 2013 production was 3.4 million wet metric tonnes, a 108 per cent increase, and had expanded production capacity to 5.4Mwmt.