- Eclipse Metals has released geophysical data re-interpretation results, highlighting multiple geophysical anomalies at Ivittuut Project.
- Seven conductive targets identified are yet to be tested.
- The re-interpretation highlights the REE magnetite and massive sulphide exploration potential.
- Initial comments on the data from Core Geophysics have delivered information on prospectivity of carbonatite occurrence and mafic dykes.
Diversified metals explorer Eclipse Metals Limited (ASX:EPM) has identified numerous geophysical anomalies with the re-interpretation of geophysical data over the Gronnedal-lka area at the Ivittuut Project (MEL2007/45) in Greenland. The Ivittuut project tenement is considered prospective for rare earth elements (REE).
The recently interpreted datasets included information from the government-commissioned regional magnetic and radiometric surveys along with commercial airborne TMI and Dighem surveys. The re-interpretation activity was aimed to identify fresh magnetic/EM anomalies with similar geophysical signatures as the known mineralisation at other mineral deposits in the Gardar Province.
EPM roped in Core Geophysics to procure and process the available open file geophysical datasets, in order to obtain initial suggestions on the REE magnetite and massive sulphide exploration potential. Thus, Core Geophysics has provided Eclipse Metals with significant information on prospectivity of mafic dykes and carbonatite occurrences.
The re-interpretation and re-modelling of the geophysical data have delivered fresh insights about the Gronnedal-lka areas. The program also confirms that the carbonatite/dyke geological units are more extensive, thereby enhancing their prospectivity for REE and sulphide mineralisation.
The Dighem survey has identified seven conductive targets, which would likely undergo follow-up exploration. The radiometric data displays anomalous response over the carbonatites. The radiometric survey has been recognised as an important direct detection tool for REE exploration. Additionally, higher resolution surveys have been suggested over the tenement.
Re-interpretation & Modelling of Geophysical data
The magnetic data (1995) delivers the best coverage and resolution over the tenement. The strong magnetic responses were recorded in the eastern portion of the tenement that are closely associated with carbonatite and gabbro bodies. The strong magnetic response outlines the potential of a high magnetite concentration besides highlighting multiple north-east and east-west trending (gabbroic) dykes of which only a few appear in the 1:100,000 mapping.
The Ivittuut mine lies on the edge of a large magnetic low (in the regional survey), indicating a granitic intrusive body. The data resolution in the vicinity of the project is too coarse to define small features to characterise the response of the intrusion.
The Dighem electromagnetic data has defined seven conducting zones, which are likely sourced from either sulphide minerals or magnetite to produce a conductivity-like response in frequency domain EM systems. The large conductive zones along the south eastern and western survey zones are due to sea water in the fjords. The target areas have been identified on the stronger conductors and are suggested to be followed up.
EM Imagery with Target Zones (Source: EPM ASX Update, 9 February 2021)
The Gabbroic dykes have been subject to base metal exploration programs with MDA investments making a NI sulphide discovery at Discovery Dyke, ~30km to the south. The Dighem survey has defined multiple conductive targets, representing sulphide or possibly magnetite sources.
The radiometric data is very coarse; however, it indicates anomalous values in the Carbonatites region that may be best defined with the uranium data. The high uranium response in the project tenement should be explored and assessed for additional carbonatites.
Background of the Geophysical Survey
During 1980s, the Geological Survey of Denmark and Greenland (GEUS) captured the most recent geophysical surveys at the Ivittuut project. The regional surveys were conducted by exploration companies and commissioned by the government.
The most prominent and relevant datasets are from the 1995 GEUS aeromagnetic survey (TMI) at 500m line spacing and a Dighem airborne electromagnetic survey at 200m line spacing conducted by Diamond Field Resources in 1995.
The Dighem survey, conducted in 1995, includes both magnetic and electromagnetic data. The magnetic data was processed and imaged separately and then, merged with the GEUS magnetic dataset. The radiometric data was sourced from the 1979-1980 radiometric surveys at the Syduran project.
Stock information – EPM traded at AUD 0.019 on 10 February 2021.