Hout Bay Manganese Mine is one of three mines still in tact in the Greater Cape Town region. Seven adits up to 84 metres long. Worked between 1909 and 1911 when 5130 tons of manganese ore removed. The manganese occurs in a narrow lode up to 1.14 metres wide and hosted by sandstone of the Ordovician Peninsula Formation. The lode trends northwest for 600 metres.