b'Discovery of the Havieron Au-Cu deposit, WAFeaturealgorithm to yield app%mag = 3.56 and app%ht + s = 0.53,Acknowledgementsto use the same nomenclature, or more correctly now that the magnetic mineral component is known to be pyrrhotite,We thank Newcrest Mining personnel, who first recognised the app%pyrr = 3.56 and app%ht + s = 0.53, where the s nowpotential of the area, for permission to publish. Thanks also to refers to non-magnetic sulphides. Visual inspection of pyrrhotiteGreatland for permission to publish. We also thank Bernie Stockill in drill core is broadly consistent with this estimate. of Daishsat Surveys Ltd. for putting the authors in contact and Ken Cross for suggesting several improvements to the manuscript. Adelaide Mining Geophysics Pty Ltd claims copyright to phase/Conclusion scatter diagrams of the type described above.We have sought to tell the Havieron story from first-hand experienceup to the 2018 discovery hole (HAD001). SomeReferencespost-discovery information is provided where it shows, for example, that the assumed remanence was confirmed andBlakely, R.J., 1995. Potential theory in Gravity and Magnetic because it supports the methodology that was applied. Applications, Cambridge University Press, 441pp.Freund J.E., 1960. Modern Elementary Statistics, Prentice-Hall Inc, The first of the historic holes HAC9101, which seems to haveElglewood Cliffs NJ, 413pp.been directed into the magnetic peak, had the potentialGrant, FS, and West, GF, 1965. Interpretation Theory in Applied to make the discovery had it been drilled deeper. A similarGeophysics, McGraw-Hill, Toronto, 584pp.comment may also pertain to the second hole, HAC9201, butHammer, S, 1939. Terrain corrections for gravimeter stations. how these holes were designed is unknown to the writers.Geophysics, 4, 184.The remaining four historic holes seem to have been designedHanneson, J.E., 2003. On the use of magnetics and gravity to based on a different philosophy, or perhaps a differentdiscriminate between gabbro and iron-rich ore-forming modelling algorithm, but they were ineffective- missing whatsystems. Exploration Geophysics. 34, (1&2), 110-113.the present model deems to be the primary target. Talwani, M., 1960. Rapid computation of gravitational attraction Remanence required shifting the magnetic source and providedof three-dimensional bodies of arbitrary shape. Geophysics, a more concise model body, so that by adding mass, the same25, 203.body could also be used to simulate the source of both theTalwani, M., 1961. Computation with the help of a digital magnetic and gravity anomalies. computer of the magnetic anomalies caused by bodies of arbitrary shape. Geophysics, 26, 203.We believe HAD001 succeeded where HAC9101 failed becauseTelford, W.M., Geldar, L.P., Sheriff, R.E., and Keys, D.A., 1980. of improved geophysical analysis and geological determination. Applied Geophysics, Cambridge University Press, 860pp.47 PREVIEW AUGUST 2022'