Magnetic geophysical data over the Lennis Project reveals a buried circular 7km diameter magnetic ring anomaly with a complex magnetic central core.
This feature is potentially caused by a meteorite impact or igneous ring complex. Government gravity geophysical data shows a distinctive, strong gravity high potentially related to a buried intrusive body located within the magnetic ring feature.
Meteorite impact structure expert Andrew Glikson has posed the magnetic rings and other characteristics are indicative of a potential meteorite impact structure. Other scientists propose the magnetic rings represent an igneous ring complex. Lennis is therefore prospective for:
- Hydrothermal zinc-copper-lead-(gold)-(uranium) mineralization related to a meteorite impact.
- Magmatic nickel-copper-PGE massive sulphide mineralization associated with a buried mafic – ultramafic intrusion.
Existing gravity coverage at Lennis is wide spaced and an infill ground based gravity survey was conducted to generate more detail on the gravity anomaly. The gravity survey delineated eleven potential igneous intrusions or alteration zones and eight potential structural target zones were identified within the approx. 20km diameter ring structure.
Induced Polarisation (IP) survey was conducted over sections of the gravity anomalies to detect potential zones of disseminated sulphides (as potential carriers of nickel – copper – gold). However, the IP survey was cut short due to the great results at Behemoth, there is insufficient data to get a proper picture of the prospectivity of Lennis. Hence, there is still scope for further work at Lennis.