I did take a look at Araxa and associated info on Nb/carbonatites in Brazil in a few posts on the WA1 site. Mainly interested in what the distribution of Nb was like in a vertical sense but, as happens, Pandora's box of info gets opened.
Some other miscellaneous Araxa info posts buried in same WA1 thread from me and others.
Inferences? Green is a poor cousin if any relation to Araxa. Could be a very different species altogether which happen to share arcuate to circular features. IMO (which is not well informed on this).
Regional Brazil: There is a wide distribution of carbonatites/alkaline/Kimberlite/syenites in Brazil. Clusters are present - ?West Arunta exploration in progress. Araxa magnetics at a different scale to Aileron (not really checked). There is Nb in the Tapira Complex though less significant, lower/grade tonnage from 1997 data. May not mean much but shows variation in adjacent complexes that would be expected given all the variables involved in Brazil and Aileron. For scale on mag map below 1 degree of latitude is approx. 110 Kms
Local Comparison of geology is a bit beyond me especially since the West Arunta (WA) data is in a 'primitive' state (2 vs 70 years) and limited. Some comments which are off the top of my head mostly so DYOR.
Size Araxa is similar to the circular Mt Weld and about 3-4 times the current known size of Luni. It would also cover Green (Rough shape from ENR's target map) quite comfortably (assuming a 5 Km diameter Araxa).
Araxa calc alkaline+- carbonatite zones vs carbonatite at WA.
Age Araxa c90 Ma vs WA ?1600 Ma??
Residual weathering: Araxa likely recent say last 5 My vs WA currently unknown but likely c10-30 Mya Much deeper weathering at Araxa <=200m vs c100m which may or may not reflect preservation. Araxa has a ring of alteration that has helped preserve the profile.
Green Magnetics very subdued relative to Araxa. The subtle arcuate shape near a known carbonatite elevates what may have been a weak target lacking gravity IMO. Shape, mag low, proximity to structures seem to be a mantra for current targeting by ENR from a simplistic view. Gravity is a feature for Luni and P2 and perhaps others but may not be necessary. Ditto all of the above when something is found that does not fit the model.
For Green the "leakage" from Luni to the NE does add a positive for exploration.
Not high grade in 82/3 ENR holes but carbonatites which could extend to the NE and E. Exploration.
(20min delay)