Sierra Leone Selection Trust
E hiwere Sierra Leone Selection Trust na 1934 na-eso nkwekọrịta n'etiti gọọmentị Britain Sierra Leone na Consolidated African Selection Trust Ltd (CAST).  E hiwere CAST na 1924 ma bụrụ akụkụ nke nnukwu ụlọ ego ngwuputa ego nke Selection Trust Ltd nke Alfred Chester Beatty (onye na-egwupụta akụ America) hibere na 1913.  Agbanyeghị na ndị Oppenheimers (De Beers) tinyere ego na CAST na ndị enyemaka ya site na 1920s wee nwee nnọchi anya ụlọ, CAST nọọrọ onwe ya na alaeze ukwu Oppenheimer.  Ụlọ ọrụ SLST nke nwere ikike ịgwupụta mineral pụrụ iche na Sierra Leone malite na 1935 ka e mere atụmatụ ịdịru afọ 99.  N'afọ 1955, ndị SLST gbahapụrụ n'ịgwupụta ihe ndị dị n'ime ala wee biri n'ubi Yengema na Tongo.  Agbanyeghị, site na okike nke Sierra Leonean parastatal National Diamond Mining Company na 1971, ụlọ ọrụ diamond ahụ bụ mba nke ọma, mechie SLST na Sierra Leone.

Ebe e si nweta ya 

 Peter Greenhlagh - West African Diamonds - Akụkọ akụ na ụba 1919-83.
 Obi nke Ihe: Sierra Leone, Diamonds & Human Security

Njikọ mpụga 

 Ndepụta nke akwụkwọ Selection Trust na Archives Division nke London School of Economics.
 Documents and clippings about Consolidated African Selection Trust Ltd in the 20th Century Press Archives of the ZBW