From 1963, Alusuisse was, for a long while, the cornerstone of Switzerland's presence in Sierra Leone, following the acquisition of a bauxite mine in the country. The civil war in the 1990s and the sale of Alusuisse once again prompted Swiss citizens to leave.
In 1920, Switzerland opened a consulate in Freetown. After Sierra Leone's independence, this consulate became a consulate general headed by an honorary representative.
On 17 April 1961, Switzerland recognised the independence of Sierra Leone. The following year, diplomatic relations were established between the two countries.
Sierra Leone, Historical Dictionary of Switzerland (de, fr, it)
Diplomatic documents of Switzerland, Dodis