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产状世界上大多数铁石棉和温石棉来自南非。矿体赋存在德瓦士兰岩系的带状铁矿床中。这些铁矿床裸露在一条长弧形地带上。该地带从开普省的奥兰治河向北延伸到博茨瓦纳,然后向东到东德兰士瓦的奥尼夫恩河地区。最重要的兰石棉矿山座落在开普省内从南部的凯格斯到北部的庞弗雷特300英里的丘陵线上。
Most asbestos and chrysotile from the world are from South Africa. Ore bodies occur in the devastated belt iron ore bed. These iron deposits are exposed on a long arc. The strip stretches north from the Orange River in the Cape Province to Botswana, then east to the Oeifoonne area in East Transvaal. The most important Blue Asbestos mines are located within the Cape Province 300 miles from Ketchum in the South to Pomplet in the North.