The Sierra Leone Selection Trust was formed in 1934 following an agreement between the government of British Sierra Leone and the Consolidated African Selection Trust Ltd (CAST).
SLST corporation which had exclusive mineral mining rights in Sierra Leone beginning in 1935 was scheduled to last for 99 years.
However, with the creation of the Sierra Leonean parastatal National Diamond Mining Company in 1971, the diamond company was effectively nationalized, ending the SLST in Sierra Leone.
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