HIGHLIGHTS
- Mangaroon North project area (E09/2422) is considered prospective for ironstone hosted REE and carbonatites similar to those at Hastings' Yangibana and
- Eight ironstone targets over a combined strike length of 10km have been identified. The aeromagnetic data has also highlighted several other discrete, narrow and strike extensive magnetic responses that are interpreted to represent ironstone units that warrant field inspection and sampling.
- Anomalous potassium response appearing intermittently over 6km is evident on the margin of tightly folded Gooragoora Formation, interpreted as a potential later stage intrusive (carbonatites).
- Importantly, several targets are located close to the Edmund Fault, a crustal-scale structure that may have acted as a pathway for carbonatitic or ferro-carbonatitic melts.
- 3D magnetic inversion modelling was completed to assist the defining and location of ironstone bodies for targeting within the survey.
- Assessment of the magnetic data for base metal and gold mineralisation has provided additional target areas for follow up investigation.
An extensive field sampling program is scheduled for April/
Project background
Venus' E09/2541 abuts tenements by
Tenement E09/2422 is located approximately 240 kilometres northeast of Carnarvon in
MagSpec Airborne Surveys conducted a high-resolution magnetic and radiometric survey (Figures 2a & 2b*) with a 50 m line spacing a for a total of approximately 3,000 line kilometres over tenement E09/2422 (Refer ASX release
3D inversion modelling (Figure 3*) was completed to highlight magnetic stratigraphy and possible ironstone or carbonatite responses. The model result has been used to specifically target ironstone bodies and a more detailed view of the inversion result over an interpreted ironstone (Figure 4*) highlights the difference between a basement response and that of an interpreted ironstone.
Iron Stone REE Targets
Eight magnetic anomalies were identified as potential iron stone targets prospective for carbonatite and therefore present priority targets for field checking. The most compelling target is an approximately 6km long narrow unit of moderate magnetic susceptibility (modelling indicates ~ 5000 x 10-5 SI) that appears to be transgressive to stratigraphy, suggesting a late-stage emplacement of a magnetic source rock along a fracture plane.
Radiometric REE Targets
The southern portion of E09/2422 is dominated by Cainozoic cover and therefore lacks targetable radiometric signatures. The remainder of the tenement shows abundant exposure of
Structural Gold Targets
This part of the analysis focussed on identifying gold prospective structures using only magnetic data. Gold mineralisation at the historical Star of Mangaroon goldmine is noted to be hosted in an anastomosing quartz vein oriented at 010 degrees (Martin et al., 2005). Target zones within E09/2422 are considered prospective when they are close to the intersection of NNE-SSW and WNW-ESE striking faults (Kreuzer, 2012). This review targets structural combinations of N-S and SE-NW intersecting faults within the granite terrane of the Durlacher Supersuite. Targets represent various interpreted fault or structural intersections considered prospective for Star of Mangaroon style mineralisation.
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