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• W59286898 abstract "S LEME AMEC Minerals Exploration Seminar June 2004 Page 8 gravels and particularly at the residual regolith – colluvium interface (e.g., Harmony (Robertson, 2004) and Calista (Anand, 2001)). Current studies at the Jaguar and Teutonic Bore base metal deposits found multi-element geochemical signatures in transported gravels that appear to show the Teutonic Bore mineralization displaced at least 4 km downstream from the deposit. Critical for the interpretation are knowledge of: • regional geochemical patterns in lateritic residuum (background signature) • geochemical signature of the targeted mineralization in lateritic residuum (target signature) • palaeotopography and dispersion direction Exploratory statistical techniques such as score indices, and multivariate discriminant analysis can then be applied to identify targets in transported materials (and residuum) and to vector towards these targets by, for example, contouring score indices or statistical parameters. CSIRO/CRC LEME and GSWA have commenced laterite geochemical mapping of the western Yilgarn Craton, to establish geochemical background over the entire Yilgarn Craton, and to identify and delineate broad geochemical trends. Sampling is on a 9 km triangular grid, sufficient to show regional geochemical trends (Cornelius et al., 2001). For the western Yilgarn, the total number of samples will be 5000 of which 1900 are available from existing collections. This leaves approximately 3100 locations but it is estimated that, due to difficult access and other problems, only about 2350 will be sampled. To date, approximately 500 samples have been collected. Representative geochemical signatures of various deposit types are currently being compiled. Most data are already available as part of previous LEME or AMIRA projects and require compilation. Some samples will have to be re-analyzed to be compatible with the regional data sets. Where geochemical signatures in residual and locally transported ferruginous nodules suggest proximity to a target, preserved micro fabrics within the nodules may give further clues as to their origin. At Golden Grove, Gossan Hill, textural information from lateritic nodules and clasts can be diagnostic (Smith, 2004). Understanding the palaeotopography and therefore probable dispersion directions is essential for interpretation of the laterite geochemical data and vectoring towards mineralization. Company drill information (depth of transported cover) and the landform will, in many cases, be sufficient to interpret geochemical trends. Where there is insufficient information, some stratigraphic drilling or geophysical surveys may be required to fill gaps. In summary, the significant benefits that lateritic residuum has had for surface exploration in the past and the enormous knowledge base that exists suggest that it and its transported components have been underutilized in exploration under cover and that these media may be used to explore areas of colluvium and alluvium more effectively. Fifteen years ago, Canada had no economic primary diamond deposit. It was the efforts of some determined companies, geologists and prospectors who unraveled the indicator mineral trails in glacial tills. Glaciofluvial sediments have now led to the discovery of diamond pipes and the start of what is now one of Canada’s most important mineral industries. The transported cover of the Yilgarn Craton could be similarly utilized rather than seen as an impediment to exploration. Acknowledgements Reviews and comments by R.E. Smith and I.D.M. Robertson are appreciated. References Anand, R.R., 2001. Evolution, classification and use of ferruginous materials in gold exploration, Yilgarn Craton, Western Australia. Geochemistry: Exploration, Environment, Analysis, 1, 221-236. ABSTRACTS LEME AMEC Minerals Exploration Seminar June 2004 Page 9S LEME AMEC Minerals Exploration Seminar June 2004 Page 9 Cornelius, M., Smith, R.E. & Cox, A., 2001. Laterite geochemistry for regional exploration surveys – A review and sampling strategies. Geochemistry: Exploration, Environment, Analysis, 1, 211- 220. Cornelius M., Singh B., Meyer, S., Smith, R.E. & Cornelius, A.J. (in prep.). Laterite geochemistry applied to diamond exploration in the Yilgarn Craton, Western Australia. Geochemistry: Exploration, Environment, Analysis, in preparation. Geological Survey of Western Australia, 1998. Laterite geochemistry of the Yilgarn Craton and Albany-Fraser Orogen: digital data from CSIRO-AGE. Western Australia Geological Survey, Record 1998/8, 13p. Grunsky, E.C., 1991. Laterite Geochemistry in the CSIRO-AGE database for the Albany-Fraser region. CSIRO/AMIRA Laterite Geochemistry Project P240, Exploration Geoscience Restricted Report 161., 2 Volumes, 145 pp., 1 5.25” diskette. Grunsky, E.C., Innes, J., Smith, R.E. & Perdrix, J.L., 1988. Report on laterite Geochemistry in the CSIRO-AGE database for the Southern Murchison Region (Yalgoo, Kirkalocka, Perenjori, Ninghan sheets). Restricted Report 2R. CSIRO Division of Exploration Geoscience. 92 pp. (Reissued as Open File Report 8, CRC LEME, Perth, 1998). Grunsky, E.C., Smith, R.E. & Perdrix, J.L., 1989. Report on laterite Geochemistry in the CSIRO-AGE database for the Northern Murchison Region (Cue, Belele, Glengarry, Sandstone sheets). Restricted Report 68R. CSIRO Division of Exploration Geoscience. 148 pp. (Reissued as Open File Report 18, CRC LEME, Perth, 1998). Mazzucchelli, R.H. & James, C.H., 1966. Arsenic as a guide to gold mineralization in laterite covered areas of Western Australia. Institute Mining Metallurgy Transactions, Volume 75, sec. B, 286-294. Robertson, I.D.M. & Gray, D.J., 2004. Harmony gold deposit, Baxter Mining District, Western Australia. In: C.R.M. Butt, M. Cornelius, K.M. Scott and I.D.M. Robertson (Compilers and Editors) CRC LEME Monograph Regolith expression of Australian ore systems, http://www.crcleme.org.au/. Smith, R.E., 2004. Recognizing, in cover, detritus from the Gossan Hill VHMS deposit, Australia. Abstract, SEG2004, Predictive Mineral Discovery Under Cover, Perth, in press. Smith, R.E. & Perdrix, J.L., 1983. Pisolitic laterite geochemistry in the Golden Grove massive sulphide district, Western Australia. Journal of Geochemical Exploration, 18, 131-164. Smith, R.E., Campbell, N.A. & Litchfield, R., 1984. Multivariate statistical techniques applied to pisolitic laterite geochemistry at Golden Grove, Western Australia. Journal of Geochemical Exploration, 22, 193-216. Smith, R.E., Perdrix, J.L., & Davis, J.M., 1987. Dispersion into pisolitic laterite from the Greenbushes mineralized Sn-Ta pegmatite system, Western Australia. In: R.G. Garrett (Ed.), Geochemical exploration 1985, Part I. Journal of Geochemical Exploration, 28, 251-265. ABSTRACTS LEME AMEC Minerals Exploration Seminar June 2004 Page 10S LEME AMEC Minerals Exploration Seminar June 2004 Page 10" @default.
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• W59286898 title "REGIONAL LATERITE GEOCHEMISTRY OF THE CENTRAL YILGARN" @default.
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