South Manganese Investment Limited, an investment holding company, engages in the manganese mining, ore processing, and downstream processing operations in Mainland China, rest of Asia, Europe, and North America. It operates through four segments: Manganese Mining, EMM and Alloying Materials Production, Battery Materials Production, and Other Business. The Manganese Mining segment mines and produces manganese products, including manganese concentrates and natural discharging manganese powder and sand. The EMM and Alloying Materials Production segment mines and processes ores used in hydrometallurgical processing for/and production of electrolytic manganese metal and manganese briquette, and pyrometallurgical processing to produce silicomanganese alloy and ferromanganese. The Battery Materials Production segment manufactures and sells battery material products, such as electrolytic manganese dioxide, manganese sulfate, lithium manganese oxide, lithium nickel cobalt manganese oxide, and trimanganese tetraoxide. The Other Business segment trades in various commodities comprising manganese ores, EMM, manganese alloys, and non-manganese metals; sells scraps; and rents investment properties and leasehold land, as well as invests in companies engaged in the mining, production, and trading of non-manganese metals. The company also produces sulphuric acid and steam. The company was formerly known as CITIC Dameng Holdings Limited and changed its name to South Manganese Investment Limited in February 2021. South Manganese Investment Limited was incorporated in 2005 and is headquartered in Admiralty, Hong Kong.