Hyperspectral imaging of sedimentary iron ores – beyond borders

SummaryBanded iron formations (BIFs) and granular iron formations (GIFs) are the two primary types of sediment hosted iron ore deposits and provide the primary source for iron, globally. Although both deposit types are comprised of bedded chemical sediments and chert layers, these deposits show notable differences in mineralogy and texture which can affect grade and processing behaviour.Hyperspectral imaging technology is able to map key iron ore minerals as well as the textural relationships between these minerals. This paper presents a case study comparing the mineralogy and texture of two distinct iron ore regions across the globe from one another: the Biwabik Iron Formation in Minnesota, U.S.A. (GIF) and the Pilbara Region in Western Australia (BIF). Using hyperspectral imaging data, the mineralogy and texture of these two distinct regions are compared to one another and to traditional iron ore characterisation from core logging. The results show that hyperspectral imaging technology is a useful tool in mapping the mineralogical, textural, and grade characteristics of both BIFs and GIFs. The application of this technology in the iron ore industry would provide rapid, accurate, and cost-effective ore characterisation to meet the ever-increasing production demand.