— For example, the Carajás and Quadrilátero Ferrífero (Iron Quadrangle) provinces in Brazil and the Hamersley province in Western Australia are among the largest iron formations on Earth and account for the bulk of the world's iron resources, in the form of iron formation-hosted high-grade iron ore.

 — Ore grade: The iron content, or iron grade, of iron ore is an important characteristic. High-grade iron ore typically contains a higher percentage of iron, which makes it more valuable and desirable for iron and steel production. Mineralogy: Different types of iron ore minerals have distinct mineralogical characteristics, such as crystal ...

Two major ore types are present in Sishen-type deposits, namely hard microcrystalline hematite ores derived from supergene enrichment of Asbesheuwels iron-formation below the

Metal Content. Crust Crust average average Grade Grade. As metal prices have not increased, and high grade ore deposits were intensively exploited in the past, it means that the Minimum_Exploitable_Reserves has increased significantly during the history of Mining in the 20th century.

Iron Ore is the raw material used to make steel and constitutes the world's second largest commodity bloc by value, after crude oil. Our medium grade iron ore has low sulphur dioxides and an average content of 65%-70% of iron oxide (hematite).

 — In the Hamersley Province, there are two major BIF-hosted iron ore styles (Fig. 6): (1) high-grade (58–<67% Fe) hematite, in many localities with martite-microplaty hematite, but little or no goethite ("blue" ore), mostly confined to the Brockman Iron Formation, and (2) high-grade (58–62% Fe) martite–goethite ores ("brown" ore) of ...

An iron ore is said to be of high grade when its Fe content is more than 65 wt.%, low grade when its Fe content is less than 58 wt.%, and medium grade when its Fe content is between 58 wt.% and...

 — The region hosts a number of world-class high-grade hematitic iron ore deposits, including the high-grade Simandou deposit (see Fig. 1.6). Recent investments by the major iron ore producing companies and countries indicate that West Africa is likely to be the next major global iron ore province.

 — Subordinated types of iron deposits are magmatic, volcanic-hosted and sedimentary ones. This paper briefly introduces the geological characteristics of major super-large iron ore clusters in the world. The proven reserves of iron ores in China are relatively abundant, but they are mainly low-grade ores.

 — Obtaining high-quality concentrates with high iron content and low content of impurities from low-grade iron ores requires the maximum possible liberation of valuable minerals and a high accuracy of separating features (difference in density, magnetic susceptibility, wettability, etc.).