摘要
Banded iron formation-hosted high-grade(>60 weight percent(wt%)iron(Fe))hematite ore deposits make up the bulk of the world’s iron ore production and reserves.They developed mainly through supergene and/or hydrothermal leaching of silica from the iron formation host rock under oxidizing conditions.Early Palaeoproterozoic iron formations of the Transvaal Supergroup host several such high-grade hematite ore deposits.The largest ones are developed in the Asbesheuwels Subgroup iron formation on the Maremane Dome,between Sishen and Postmasburg in the Northern Cape Province of South Africa.These deposits currently produce virtually all of South Africa’s annual supply of about 78 million tonnes(Mt)of high-grade hematite ore.
