Data presented in this airmag announcement highlighted spiky magnetic anomalies with some similarities to Havieron. There is much more information to be deduced from detailed analysis of this survey that is likely to be too technical to do much more than form the basis for drilling programs or further geophysical surveys.
[For this post I worked mostly on the Mag-03 anomaly map only to realise (as I was beginning to type) that the airmag for this, and Mag-04, are from previous surveys which would likely have been flown with different line spacings, heights and sensors.]
Having done the research already, I will still post it because some of my rough methodology for the Mag-03 map area will be refined by trained geophysicists for all the 2018 survey areas, including those that don't have "pimples" namely the Triangle and Northern (E45/5219) areas (4 and 1 resp on this map.) The Mag-03 magnetic map extends down to Minyari/Waca/Judes with mag data that seems to have quite good resolution.
There are some fairly obvious magnetic domains (real vs my imagination) which I have numbered 1-6. AZY would have had this professionally interpreted. Domains: 1 folded statigraphy; 2 complex margin to possible intrusive complex(Domain 4); 3 dramatic change in magnetic pattern - depth of cover structure???; 5 probable deep cover and different geological environment with NW trending dykes or stratigraphy; 6 probably similar to 5 or the margin of a major structural embayment to the west. There are probably more subtle domains.
Zooming in on Mag-03 "pimple" shows the resolution available in these data. The inflection I mentioned in my last post is clearly visible and the "pimple" is composed of 3 separate peaks. The strong magnetic halo, plus the bend, could suggest something other than a local local increase of magnetism in an otherwise "moderately" magnetised unit. There are also subtle pimples on a similar magnetic unit to the NNE (plus a weak ?flexure). Perhaps also to the south but masked by the red and white circle.
Another area that is interesting when looked at in detail is the Minyari "Dome". A simplistic interpretation: stratigraphic units (Red) and a possible fault (Green) which ?terminates Minyari and Waca (south and north ends resp.). The dome is fairly complex with NCM and AZY probably both spending a lot of time trying to work out what joins to what.
The drilled extent of the Minyari and WACA deposits seem to match the shortish magnetic signatures for both - what happens at each end has been tested but still???
A lot of drilling, IP, and thought has gone into this structurally complex area but may only have touched the surface, if at all, in some parts.
Drilling geophysical anomalies is the only way to prove or disprove economics at the moment.
Subtle magnetic "pimply?? highs" are outlined in yellow on the map below - (Minyari and Judes (very subtle see below as locations may not be accurate). Have all been tested - most....
Over the last year AZY conducted a large aircore programme, AEM (not going to add this in) and extended a previous IP survey.
The image below shows mineralization index overlaid on magnetics. Some 20Kms? from memory and still sparse in some areas. The company has to be very creative with 4000+ sq kms to explore.
Another aspect of magnetics, and most (?all) digital data, is that they can be processed in many ways which enhance or reduce features. The image of Judes, below, is not easy (for me) to reconcile with the Mag-03 processing style. It shows the location of Judes and Hole 18-166 with a long intersection of Cu in what appears to be a "quiet" magnetic location.
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I would be interested to see if there is any magnetic signature associated with AEM anomalies (40-42) in the northern survey area on E45/5219 (area 1 at start). Given previous surveys here, I would suspect only subtle trends which are marginal to distal to distinctive magnetic intrusives that are well known from magnetics in the area.
I have been looking at Sol1's reference to RDM's 2018 pdf which gives some interesting gravity and other data on the northern Paterson with a view to posting in due course.
(20min delay)