Mitchell was sentenced to death 11 times on April 30, 1990, for the murder of 11 people of the Trust Feeds community near New Hanover in the KwaZulu-Natal midlands during a night vigil in 1988.
His sentence was later commuted to 30 years' imprisonment.
Four police constables were also charged and found guilty in connection with the killings and sentenced to 15 years in prison. They were granted indemnity and released in June 1994 in terms of the Further Indemnity Act.
Mitchell's amnesty application will be heard in the Pietermaritzburg city hall.