b'FeatureDiscovery and geophysics of the Khamsin depositbe used as a third independent (and non-invasive) method toHaynes, D.W., K.C. Cross, R.T. Bills, and M.H. Reed. 1995. Olympic Dam Ore assess electrical properties for base metal sulphides, in order toGenesis: A Fluid-Mixing Model. Economic Geology 90: 281-307.further reduce risk in the risky endeavour of mineralexploration. Hodges, G., and R. Smith. 1997. Induced Polarization Effects in Time DomainEM Data In A. Gubbins, ed. 1997. Proceedings of Exploration 97: AcknowledgementsFourth Decennial Conference on Mineral Exploration: 565-566. Holladay, J.S. 1981. YVESFT and CHANNEL: Asubroutine package for stable The authors thank Jim McKinnon-Matthews, OZ Minerals, fortransformation of sparse frequency domain electromagnetic data to the managing aspects of the efforts needed to produce this report,time domain. Research in Applied geophysics 17. University of Toronto: and the authorities at OZMinerals Ltd, now BHP, for generousGeophysicsLaboratory.funding of the TEM work and for permission to publish the results.Hohmann, G.W. 1975. Three-Dimensional Induced Polarization and Electromagnetic Modelling. Geophysics 40: 309-324. We also acknowledge the work of Graham Haynes, HaynesLajoie, J.J., and G.F. West. 1976. The Electromagnetic Response of a Surveys Ltd, who collected the gravity data and Brett Weston,Conductive Inhomogeneity in a Layered Earth Geophysics 41(6a): 1133-1156. of GEM Geophysics Ltd, Perth, who managed the collection and processing of the TEM data. JEH is grateful to Richard S. Smith andMacnae, J.C., and Y. Lamontagne. 1987. Imaging quasi-layered conductive JamesC.Macnae for comments that improved the TEM discussion. structures by simple processing of transient electromagnetic data. Geophysics 52: 545-554.McNeill, J.D., R.N. Edwards, and G.M. Levy. 1984. Approximate calculations Referencesof the transient electromagnetic response from buried conductors in a conductive half-space. Geophysics 49: 918-924.Australian Stock Exchange Release, 2014. Initial 202Mt at 0.6% copperNabighian, M. 1979. Quasi-static transient response of a conducting half-Resource at Khamsin, 26May. spacean approximate representation. Geophysics 44: 1700-1705.Blakely, R.J. 1995. Potential Theory in Gravity and Magnetic Applications.Rai, S.S. 1985. Transient electromagnetic response of a thin conducting plate Cambridge University Press, 441pp. embedded in conducting host rock. Geophysics 50: 1342-1349.Esdale, D.J., D.F. Pridmore, J.H. Coggon, P.M. Muir, P.K. Williams, and F.P.Fritz.Rimbert, F., J-C. Erling, and J. Lakshmanan. 1987. Variable density Bouguer 1987. Olympic Dam depositgeophysical case history. Exploration Geophysicsprocessing of gravity data from Herault, France. First Break 5 (1): 9.18: 47-49. Republished in M.C. Dentith, ed. 2003. Geophysical Signatures of South Australian Mineral Deposits. ASEG Special Publication 12, PIRSA. Smith, R.S., R.N. Edwards, and G. Buselli. 1994. An automatic technique Flis, M.F., G.A. Newman, and G.W. Hohmann. 1989.Induced polarization effectsfor presentation of coincident loop, impulse response, transient in time-domain electromagnetic measurements. Geophysics 54: 514-523. electromagnetic data. Geophysics 59: 1542-50.Fullagar, P.K. 1989. Generation of Conductivity-Depth Pseudosections fromTalwani, M. 1961. Computation with the help of a digital computer of the Coincident Loop and In-Loop TEM Data. Exploration Geophysics 20:43-45. magnetic anomalies caused by bodies of arbitrary shape. Geophysics 26:203.Hanneson, J.E. 1992. The transient EM step response of a dipping plate in aTalwani, M. 1960. Rapid computation of gravitational attraction of three-conductive half-space. Geophysics 57:1116. dimensional bodies of arbitrary shape. Geophysics 25: 203.Hanneson, J.E. 2003. On the use of magnetics andgravity to discriminateWalker, P.W., and G.F. West. 1991. A robust integral equation solution between gabbro and iron-rich ore-forming systems. Explorationfor electromagnetic scattering by a thin plate in conductive media. Geophysics34 (1&2): 110-113. Geophysics56: 11401152.Hanneson, J.E., and G.F. West. 1984. The horizontal loop electromagneticWeidelt, P., 1975. Electromagnetic induction inthree-dimensional structures. response of a thin plate in a conductive earth: Part I Computational method.J. Geophys. 41:85-109.Geophysics 49: 411-420. Part II Computational Results and Examples.West, G.F. and J.C. Macnae. 1982. Lecture/Practical course: Electromagnetics Geophysics 49: 421-432. for Geophysical Exploration. South African Geophysical Association, Hart, J., and H. Freeman. 2003. Geophysics of the Prominent Hill prospect,Johannesburg, 13-19 January.South Australia. In M.C. Dentith, ed. Geophysical Signatures of South Australian Mineral Deposits, ASEG Special Publication 12, PIRSA.FEBRUARY 2024PREVIEW 51'