Gholamreza Fotoohi Rad
In brief terms, I think the best type of Fe ore deposits related to the grade of ore are typically high-grade deposits, which have a high percentage of iron content. The two most valuable types of high-grade iron ore deposits are:
1. Banded Iron Formations (BIFs):
Grade: 25-45% Fe, upgradeable to 65-70% Fe.
Characteristics: Sedimentary rocks with alternating iron-rich and silica layers, found in regions like Pilbara and Lake Superior.
2. Direct Shipping Ore (DSO):
Grade: Over 60% Fe, up to 65-70% Fe.
Characteristics: Naturally enriched, requires minimal processing, commonly found in hematite deposits.
Hematite (Fe₂O₃) and Magnetite (Fe₃O₄) are the primary minerals in these deposits, with hematite being favored for its higher iron content and easier processing.
As far as I remember from the literature, the best types of iron ore deposits in relation to ore grade are primarily hematite and magnetite ores. Hematite ores are generally preferred for their high iron grades, but magnetite ores are also valuable due to their potential for concentration and processing. The choice between these types often depends on the local geological conditions and the specific requirements of the steelmaking process. I believe there was a publication from Australia on this topic; it should be available on this site: https://www.ga.gov.au/
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