Manganese mine opened in 1894. Yielded 8.6 million tons of oxide ore and 3.4 million tons of manganese silicate-carbonate protore during 1902-95.
Ref: P. Leverett, P. Wiiliams & D. Hibbs (2008) Ca-Mg-Fe rich Rhodonite from the Morro da Mina Mine, Conselheiro Lafaiete, Minas Gerais, Brazil. Mineralogical Record 39:125-130.