sentences:  Gold mining and other industrial operations in the region were largely reliant on corrective labor camps of the Gulag system, with a large number operating in Susuman's vicinity.From 1949 until 1956, Susuman was the base for one of the Soviet Union's largest corrective labor camps, the "Zaplag" of the Dalstroy program.During this time, up to 16,500 prisoners were kept in the camps.