JAMP  Vol.3 No.2 , February 2015
Magnetic Mineralogical Characteristics of Hamersley Iron Ores in Western Australia
Author(s) William W. Guo

This paper presents the research outcomes of a magnetic mineralogical study on Hamersley iron ores. Thermal magnetic analysis shows that typical high-grade martite-microplaty hematite or M- (mpl H) and martite-microplaty hematite-goethite or M-(mpl H)-g ores contain a small amount of original magnetite. A small amount of magnetite/maghemite and pyrite/pyrrhotite/siderite may exist in typical martite-goethite (M-G) and martite-ochreous goethite (M-oG) ores. In “the hardcap zone”, M-(H)-g ores contain a small amount of magnetite and maghemite. Compared with XRD, thermal magnetic analysis is not only more sensitive in identifying trace of magnetite contained in high-grade hematite ores, but also more diagnostic in identifying other unstable magnetic minerals like maghemite and pyrite/pyrrhotite/siderite co-existed in the ores.

Cite this paper
Guo, W. (2015) Magnetic Mineralogical Characteristics of Hamersley Iron Ores in Western Australia. Journal of Applied Mathematics and Physics, 3, 150-155. doi: 10.4236/jamp.2015.32023.
[1]   Guo, W. (1999) Magnetic Petrophysics and Density Investigations of the Hamersley Province, Western Australia: Implications for Magnetic and Gravity Interpretation. The University of Western Australia, Perth.

[2]   Guo, W., Dentith, M.C., Bird, R.T. and Clark, D.A. (2001) Systematic Error Analysis of Demagnetisation and Implications for Magnetic Interpretation. Geophysics, 66, 562-570. http://dx.doi.org/10.1190/1.1444947

[3]   Guo, W.W., Li, Z.X. and Dentith, M.C. (2011) Magnetic Petrophysical Results from the Hamersley Basin and Their Implications for Interpretation of Magnetic Surveys. Australian Journal of Earth Sciences, 58, 317-333. http://dx.doi.org/10.1080/08120099.2011.552984

[4]   Li, Z.X., Powell, C.M. and Bowman, R. (1993) Timing and Genesis of Hamersley Iron-Ore Deposits. Exploration Geophysics, 24, 631-636. http://dx.doi.org/10.1071/EG993631

[5]   Powell, C.M., Oliver, N.H.S., Li, Z.X., Martin, D.M. and Ronaszeki, J. (1999) Synorogenic Hydrothermal Origin for Giant Hamersley Iron Oxide Ore Bodies. Geology, 27, 175-178. http://dx.doi.org/10.1130/0091-7613(1999)027<0175:SHOFGH>2.3.CO;2

[6]   Li, Z.X., Guo, W. and Powell, C.M. (2000) The Timing and Genesis of the Hamersley Iron Ore Deposits: A New Palaeomagnetic Approach. Minerals and Energy Research Institute of Western Australia (MERIWA), Report M242.

[7]   Guo, W.W., Li, M.M., Whymark, G. and Li, Z.X. (2009) Mutual Complement between Statistical and Neural Network Approaches for Rock Magnetism Data Analysis. Expert Systems with Applications, 36, 9678-9682. http://dx.doi.org/10.1016/j.eswa.2008.11.045

[8]   Guo, W.W., Li, M.M., Li, Z.X. and Whymark, G. (2010) Approx-imating Nonlinear Relations between Susceptibility and Magnetic Contents in Rocks Using Neural Networks. Tsinghua Science & Technology, 15, 281-287. http://dx.doi.org/10.1016/S1007-0214(10)70062-6

[9]   Guo, W.W. A Study of Rock Magnetism of High-Grade He-matite Ores. Journal of Applied Mathematics and Physics. (In Press)

[10]   Guo, W.W. (2010) A Novel Application of Neural Networks for Instant Iron-Ore Grade Estimation. Expert Systems with Applications, 37, 8729-8735. http://dx.doi.org/10.1016/j.eswa.2010.06.043

[11]   Porath, H. and Chamalaun, F.H. (1968) Palaeomagnetism of Aus-tralian Haematite Ore Bodies II, Western Australia. Geophysical Journal of the Royal Astronomical Society, 15, 253-264. http://dx.doi.org/10.1111/j.1365-246X.1968.tb00184.x

[12]   Schmidt, P. and Clark, D.A. (1994) Palaeomagnetism and Magnetic Anisotropy of Proterozoic Banded-Iron Formations and Iron Ores of the Hamersley Basin, Western Australia. Precambian Research, 69, 133-155. http://dx.doi.org/10.1016/0301-9268(94)90083-3

[13]   Clark, D.A. and Schmidt, P. (1986) Magnetic Properties of the Banded-Iron Formations of the Hamersley Group, WA. CSIRO Division of Mineral Physics, AMIRA Report 1638.

[14]   Kneeshaw, M. (1984) Pilbara Iron Ore Classification—A Proposal for a Common Classification for BIF-Derived Supergene Iron Ore. Proceedings of Australasian Institute of Mining and Metallurgy, 157-162.

[15]   Morris, R.C. (1985) Genesis of Iron Ore in Banded Iron-Formation by Supergene and Super-gene-Metamorphic Processes—A Conceptual Model. Handbook of Strata-Bound and Stratiform Ore Deposits, Elsevier, 73-235.

[16]   Harmsworth, R.A., Kneeshaw, M., Morris, R.C., Robinson, C.J. and Shrivastava, P.K. (1990) BIF-Derived Iron Ores of the Hamersley Iron Basin. Geology of Mineral Deposits of Australia and Papua New Guinea, 617-642.

[17]   Merrill, R.T., McElhinny, M.W. and McFadden, P.L. (1996) The Magnetic Field of the Earth: Paleo-magnetism, the Core, and the Deep Mantle. Academic Press, San Diego.

[18]   Tarling, D.H. and Hrouda, F. (1993) The Magnetic Anisotropy of Rocks. Chapman & Hall, London.

[19]   Dunlop, D.J. and Ozdemir, O. (1997) Rock Magnetism. Cambridge University Press, Cambridge. http://dx.doi.org/10.1017/CBO9780511612794

[20]   Thompson, R. and Oldfield, E. (1986) Environmental Magnetism. Allen and Unwin, London. http://dx.doi.org/10.1007/978-94-011-8036-8