b'Data trends Data trendsA guide to measuring magneticreprinting the device manuals and text susceptibility in the field books. The simplified guide is intended only as a means of avoiding common The quality of petrophysics collected inerrors. We do, however, intend to produce the field is highly variable and may resultmore comprehensive guides with the in lost opportunities for companies tryinghelp of Cameron Adams at the University to later model and plot their explorationof Western Australia. These guides will course. In response, ASEG Members Regisenable on-site exploration geologists to Neroni, Mark Duffett and Tim Keepingdevelop a better understanding of the are producing simple, single sheetpurpose of petrophysical data and how it is (double sided) petrophysical field guideslikely to be used, as well as assisting them for exploration geologists to downloadwith identifying common pitfalls in data from the ASEG website, print, laminateacquisition. The first draft of the magnetic and hand to a field assistant. Each majorsusceptibility field guide is appended category will have its own guide tobelow. Please review the guide and email improve the quality control. These areyour questions and/or any feedback to magnetic susceptibility, specific gravitytechnical-standards@aseg.org.auTim Keepingand conduction.Associate Editor for geophysicaldata management and analysisThe guides are not comprehensive nor technical-standards@aseg.org.au explanatory, as we would simply be GUIDE TO MEASURING MAGNETIC SUSCEPTIBILITY IN THE FIELDWhat are you (mostly) measuring? the iron in a rockPreparing the meter- read the manual- set correct drill hole core diameter and units to SI- Ensure that these settings are recorded together with your dataAn ideal sample- is as wide as the device to maximise rock sampleTaking a measurement- zero the meter before each measurement (required by GMS-2/RT-1)- pick up and measure the sample away from metals and other rocksAvoiding bad measurements- do not measure in a tray as iron is commonly found in- aluminium alloy tray bodies- nails and screws in wood trays- trestles that trays sit on- do not wear excessive jewellery- do not use electronic devices nearby as they create magnetic fieldsOCTOBER 2021 PREVIEW 42'