b'Conferences and eventsNewsallow geophysicist to test their ideas using real data and represents an important resource for the exploration geophysicist.We are so lucky in Australia to have all the data available thanks to the state geological surveys and Geoscience Australia, John Hart.Havieron Gold-Copper Deposit: Discovery and geophysical characteristicsEric Battig, NewcrestThe world-class Havieron gold-copper discovery is a success story of systematic Rapt audience at MAG22 undercover exploration leaning heavily on geology-led geophysical modelling. the Lower Soldiers Cap Group, is aGeophysics of the Prominent HillThe deposit is situated ~40 km east of steeply dipping system, consisting of aIOCG Deposit Telfer, within the Proterozoic Paterson number of massive sulphide, pyrrhotiteProvince, and comprises a series of rich lenses. The discovery was madeJohn Hart, Rio Tinto nested vertically extensive breccia using B-field ground EM techniquescolumns. Mineralisation primarily occurs through 50 m of highly conductive,In November 2001, Minotaur Resources announced the results of discoveryalong the contacts of a multiphase Mesozoic sediments to the southeastintrusive complex trending NW-SE and of the Eloise mine. From 2014 throughdrill hole URN001, at the Prominent Hill prospect. The drill hole intersected 107 mremains open. The Havieron bulls-to 2017, Minotaur Exploration andeye anomaly was first recognised by Oz Minerals conducted a series ofaveraging 1.94% Cu and 0.66 g/t Au from 200 m depth, and a further 152 mNewmont in a 1980s regional airborne airborne and ground EM surveys inmagnetic survey. The first drill hole, sited an attempt to identify pyrrhotiteaveraging 1.20% Cu and 0.61 g/t Au from 429 m, hosted in a hematite breccia.by Newcrest using higher resolution rich, massive sulphide mineralisationaeromagnetic data, intercepted more similar to the Eloise deposit which wasURN001 was drilled to test a gravity anomaly, located under 150 m of Mesozoicthan 100 m of mineralisation below discovered by BHP in 1987. Incremental420 m of cover. Follow-up aeromagnetic discoveries of small amounts of sulphidecover, and to the south of a previously drilled strong magnetic anomaly. Followingand gravity surveys were crucial in mineralisation led to surveys beingrecognising the significance of magnetic extended into areas previously thoughtthe completion of URN001, a number of potential field and electrical surveysremanence, which fed directly into the to be uninteresting, despite being quitemethodology used in targeting of the close to a deposit. Part of this successwere completed over the then Prospect Area, primarily in an attempt to map thediscovery hole. Magnetic remanence was due to a thorough understandinghas subsequently been confirmed of the geophysical response of ISCGdistribution of copper mineralisation.in petrophysical measurements, and systems as well the tools with which toThis presentation revisits the deposit,ongoing petrophysical characterisation explore for these systems. Jericho is anearly 20 years after the originalis being employed to improve blind deposit, has little magnetism, nopresentation on the geophysics ofgrowth and brownfields exploration surface geochemical anomalism andthe deposit and uses open file dataoutcomes. Recent surveys include displays very little alteration, makingprimarily from the SARIG database. Inmagnetotellurics, seismic and borehole it geologically difficult to find andSouth Australia data acquired more thatelectromagnetics.essentially reliant on EM techniques inyears ago is released in accordance with making the discovery. provisions in the Mining Act. This meansInnovation is supported by Dont let any pre-conceivedthat high quality digital data is freelypersistent investment and cross-ideas get in the way, Andrewavailable over a number of significantdiscipline engagement, Eric base-metal deposits. This data can be Thompson. used be to undertake case-studies whichBattig.17 PREVIEW FEBRUARY 2023'