Red and Green targets? If the above is what you were referring to, then it is the variations of gravity in the eastern part of Aileron. Highest gravity is white grading down through reds to orange green and blue being the lowest.
The targets are mainly from a combination of magnetics/gravity and interpreted structure.
After the Luni discovery gravity highs were the rage.
However, it is seldom simple and drilling by ENR in 2023 showed that gravity and mag lows can host carbonatites with local Nb. Targets such as Joyce, Macklin, Leopard, Crabeater and McIllroy were added following the feedback from results in 2023.
Bit repetitive but some comments on the targets here in east Aileron.
Perce is nearly a pure gravity target with only very subtle magnetics. By now they will have some idea of what is causing it.
A strong suspect is some form of intrusive plug with a diameter of 1+-Km. The lack of magnetics in dense rocks makes a Caird or Crean south like target (g*abbro/Lamprophyre resp.) unlikely unless there is destruction of magnetite (hence the idea of hematite alteration). Could be a carbonatite intrusion as magnetite and other magnetic minerals can be highly variable in them.
Mawson: cannot say too much although it does have characteristics of the magnetics and gravity in the western part of Pachapadra. Magnetics show linearity that extends beyond the gravity high suggesting a possible gneissic host. Carbonatite injected into the regional foliation could be one possibility.
Wordie is a circular weak gravity feature. At last year's AGM it was mentioned as being one of the most likely carbonatite intrusive targets (memory only.
Leopard ??? Doesn't look anything special compared to many other areas IMO. Access to the full geophysical database might change my opinion. Geophysicist and company geo choices.
Yes to carbonatite, perhaps to Nb in core.
Other than specimens at meetings I have no personal experience of carbonatite.
Carbonatite is a pretty unusual lithology when not expected. Probably had the WA1 geos puzzled a bit at P2. Likely sussed out by the time they drilled Luni's first 3 holes.
It is known in ENR's part of the West Arunta from examples in drill core at Crean (and Hoschke) plus RC chips at another 3 prospects. The geos will have a good idea if they run into anything similar. Suspect there might be some sharing of info and visuals between ENR and WA1 as well.
PXRF can help in at least two ways,
1 It would give around half the periodic table of what is in the rocks intersected and help lithology identification. I do not know if it would directly help determine carbonatites but could split them into common forms Calcio/Magnesio/Ferrro at least when combined with visuals on high carbonate bearing lithologies.
Marginal alteration of carbonatites is termed fenite and glimmerite. The latter has distinctive micas.
2 Identify relative zones of niobium. The selection of priority samples by ENR and WA1 suggest they have a mechanism that seems to work before assays (more obvious for WA1 anyway though priority AC samples recently for ENR).
Visually identifying the main Nb bearing mineral, pyrochlore, in the weathered zone may improve with feedback from Assays and/or PXRF.
In fresh rock, and at higher percentages of pyrochlore, visual ID would also likely improve with experience. There are a complex suite of Nb bearing minerals many of which might only be recognized by specialists in the lab.
Just knowing what may be present and having some type examples can help.
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Regarding the SP I was basically joking about a duster at Perce.
There does seem to be some market wide weakness over the last week or so with ENR following the basic trend.
EOFY as mentioned by
@RavingStark;
Big funds pulling cash out of Australia was something I saw elsewhere. We are along for the ride and it does tend to get bumpy.
Unlike RNX's drilling at Cloncurry I doubt there is as much SP focus on ENR's EIS holes at Aileron. Some, but limited success or dusters are not as critical.
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