Reference | {Deposit:: LEFOND,S.J., 1973, BRAZILIAN MINING: RELAXED GOVT. ATTIT. PA}{Deposit:: WAY FOR EXPLOITING CRITICAL RESERVES: MIN. ENG. VOL 25:11}{Deposit:: ROCHA,A., 1973, PERFIL ANALITICO DO CHUMBO: DNPM BOLETIM NO.}{Deposit:: DE JANEIRO, 76P.} |