A new method for spatial centrographic analysis of mineral deposit clusters |
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| Institution: | 1. Centre for Exploration Targeting, Western Australian School of Mines, Curtin University of Technology, G.P.O. Box U1987, Perth, WA 6845, Australia;2. Regalpoint Exploration Ltd., 225 St George''s Terrace, Perth, WA 6000, Australia;3. Centre for Exploration Targeting, M006, University of Western Australia, 35 Stirling Highway, Crawley WA 6009, Australia;1. Royal College of Surgeons in Ireland, Dublin, Ireland;2. Graduate Entry Medical School, University of Limerick, Limerick, Ireland;3. UCD School of Medicine and Medical Science, National Maternity Hospital, Dublin, Ireland;4. National University of Ireland, Galway, Ireland;5. UCD Centre for Human Reproduction Coombe Women and Infants University Hospital, Dublin, Ireland;6. Royal Jubilee Maternity Hospital, Belfast, Ireland;7. University College Cork, Cork University Maternity Hospital, Cork, Ireland;8. Rotunda Hospital, Dublin, Ireland;9. Coombe Women and Infants University Hospital, Dublin, Ireland;1. Master Program in Long-Term Care, College of Nursing, Taipei Medical University, Taipei, Taiwan;2. School of Gerontology Health Management, College of Nursing, Taipei Medical University, Taipei, Taiwan;3. Department of Physical Medicine and Rehabilitation, Taipei Medical University Hospital, Taipei, Taiwan;4. Department of Public Health, College of Health Sciences, Kaohsiung Medical University, Kaohsiung, Taiwan;5. Department of Occupational and Environmental Medicine, Kaohsiung Medical University Hospital, Kaohsiung, Taiwan;6. Department of Epidemiology and Biostatistics, School of Public Health, University of Maryland, College Park, MD, USA;7. Institute of Epidemiology and Preventive Medicine, National Taiwan University, Taipei, Taiwan;1. Private Practice, People''s of Seoul, South Korea;2. Professor, Department of Orthodontics, Catholic University of Korea, People''s of Seoul, South Korea;3. Professor, Graduate Dentistry Program in Orthodontics, School of Dentistry, Pontifical Catholic University of Parana, Curitiba, Brazil;4. Associate Professor, Department of Orthodontics, Center for Advanced Dental Education, Center for Advanced Dental Education, St. Louis University, St. Louis, Missouri;1. Resident, Department of Stomatology, Huashan Hospital, Fu Dan University School of Medicine, Shanghai, China;2. Resident, Department of Orthodontics, Ninth People''s Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai Key Laboratory of Stomatology, Shanghai, China;3. Professor, Department of Orthodontics, Ninth People''s Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai Key Laboratory of Stomatology, Shanghai, China |
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| Abstract: | A centrographic method for analysing mineral deposit clusters is illustrated using the komatiite-hosted Kambalda nickel sulphide deposit cluster, Yilgarn craton, Western Australia. In this method, the standard distance circle divides the cluster into a more endowed inner part and a less endowed peripheral part. The standard deviational ellipse, another centrographic object, depicts the preferred northwest–southeast trend of nickel orebodies at Kambalda. Weighted centrography shows that nickel endowment is greater in the eastern than western part of the cluster. The spatio-geometric interaction of the circle and ellipse splits the cluster into several partitions. The relative concentration of nickel orebodies or endowment within a partition in relation to their concentration within the entire cluster is termed ‘capture efficiency’. Komatiite areal trace exhibits higher nickel orebody capture efficiency than spatio-geometric partitions; however, some spatio-geometric partitions exhibit nickel endowment capture efficiencies comparable to that of komatiite. Furthermore, nickel orebody and endowment capture efficiencies of komatiite are elevated only within the standard distance circle. These results suggest that at Kambalda, (i) the standard distance circle is a prime window for understanding the komatiite-hosted nickel system, and (ii) spatio-geometric partitions are plausible locales for spatial analysis of nickel orebodies and endowment. The proposed centrographic method is potentially useful in mineral resource estimations and mineral exploration targeting. |
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