IGO Core Geophysics Collaboration Final Report

Abstract

The objective of the 200m spaced airborne magnetic survey was to obtain a more detailed dataset in an area recently identified as having the potential to be highly prospective for iron oxide-copper-gold (IOCG) style mineralisation. The survey commenced on 17 August 2016 and ended on 5 October 2016. It was flown by Thomson Aviation out of the Nyirripi Aboriginal Community and covered EL 24915 and ELA's 29748, 30729, 30730, 30731, 30732, 30733, 30739 and 30740. The data acquired from this survey is currently being used to assist with: Detailed mapping of the interpreted Andrew Young Igneous Complex (AYIC); Enhanced identification of tectonic lineaments and fracture zones on a regional scale; and, Prospect scale targeting of high amplitude magnetic anomalies. It is anticipated that this work will be completed by January 2017. The decision to conduct the survey over (predominantly) exploration licence applications (ELA's) whilst negotiations with the Central Land Council (CLC) are ongoing means that any potential discovery will be able to be progressed as rapidly as possible once the ELA's are granted. If IOCG mineralisation is confirmed it is planned to utilise the survey data in conjunction with data obtained from a planned 1 km spaced ground gravity survey to be conducted once all the ELA's are granted and heritage clearance obtained. This combination of detailed magnetic and gravity data should allow Independence group NL (IGO) to directly target IOCG mineralisation under cover by detecting hematite accumulations (gravity high) and magnetite accumulations (magnetic and gravity highs). This approach already been used successfully in Queensland and South Australia, with the discovery of the Ernest Henry, Olympic Dam, Prominent Hill and Carrapeteena IOCG deposits.