Abstract
Rock magnetism is useful in various applications. Hematite is one of the two most important carriers of magnetism in the natural world and its magnetic features were mostly studied through laboratory experiments using synthetic hematite samples. A gap exists between the magnetic behaviors of hematite contained in the natural rocks and ores and those of synthetic hematite samples. This paper presents the results of a rock magnetism study on the natural hematite ores from the Whaleback mine in the Hamersley Province in the northwest of Western Australia. It was found that high-grade hematite ores carry a much higher remanent magnetization than induced magnetization. Hematite ores with less than 0.1% magnetite appear to have an exponential correlation between the bulk susceptibility and hematite content in weight percentage, different from the commonly accepted linear relationship between the bulk susceptibility and hematite content obtained from synthetic hematite samples. The new knowledge gained from this study contributes to a better understanding of magnetic behaviors of hematite, particularly natural hematite, and hence applications to other relevant disciplines.
Highlights
Rock magnetism is a study focusing on magnetic features of various natural rocks, including different types of ores
This paper presents the results of such a rock magnetism study on the natural hematite ores from the Whaleback mine
= κb 0.00048×100.00738W (SI) (30 ≤ W ≤ 100). This is different from the linear relationship between the bulk susceptibility and hematite obtained from synthetic hematite samples [12]
Summary
Rock magnetism is a study focusing on magnetic features of various natural rocks, including different types of ores. Most research outcomes were resulted from laboratory experiments using synthetic hematite samples. Such knowledge is very useful and important in understanding the fundamental magnetic behaviors of hematite. There is a gap between the magnetic behaviors of hematite contained in the natural rocks and ores and those of synthetic hematite samples. The former is likely to better reflect specific applications in the real world. (2015) A Study of Rock Magnetism of High-Grade Hematite Ores. This paper presents the results of such a rock magnetism study on the natural hematite ores from the Whaleback mine. New knowledge gained from this study contributes to a better understanding of magnetic behaviors of hematite, natural hematite, and applications to other relevant disciplines
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