In history before 1945, the first institution that handled mining in Dutch East Indies is Department of Mining ("Dienst van den Mijnbouw") Following Japanese occupation of the Dutch East Indies in 1942, the department name was changed to Chisitsu (地質) Chosajo, then to Mining and Geology Bureau ("Djawatan Tambang dan Geologi") after Proclamation of Indonesian Independence which was formed on 11 September 1945 under the Ministry of Prosperity.