No disturbance to lines set up for AC drilling to AC drill sites and some spot activity that has not been reported as drilling.
Irregular yellow outlined areas appear to have been aircore drilled but not reported.
Always good to see a good spatial correlation of anomalous holes as above. More drilling probably with RC to firm up any good zones within it or hopefully all.
============================ The broader structural pattern has been well covered. AZY have been struggling to understand the structure at Minyari for years. Perhaps they have reached the next plateau of information.
Essentially think of a pipe like breccia like Havieron that gets faulted as described in the announcement and expanded on by @Onceover.
In simple terms it makes sense.
A sequence of events has taken place: Some basics which are not necessarily in order or exclusive
Sedimentation - thick variable sequence with some more susceptible to mineralisation than others.
Folding to produce Minyari Dome. No evidence of breccia being folded??
Intrusions in broader area - felsic and mafic?.
Formation of a breccia pipe.
Faulting of breccia pipe. As presented in the announcement the "pipe" seems to have acted like a solid body.
Extremely simplistic and welcome comments and additions.
================== Some issues which may or may not need to be addressed. Many more probably.
Point 1 has significant implications as to where the best mineralisation could form as well as barren zones.
At Telfer there seems to be a huge vertical range of "good":sediments plus structural complexities that add to creating a tier 1 orebody.
Havieron seems to be a high grade pipe with very little information available about any grade control from the sediments surrounding it.
Winu and Calibre, in broad terms, seem like large alteration zones largely independent of sedimentary 'control'
Minyari does seem to have some level of sedimentary 'control'. Physical and (perhaps) chemical have been mentioned. More brittle can have better mineralisation.
If the sedimentary sequence has a significant impact on the localisation of mineralisation then folding and faulting it can have implications for depth continuity. With normal faulting as envisaged at Minyari the attitude of bedding to structure becomes important. Originally horizontal or weakly domed then a sub vertical pipe will cut a wide range of beds not all of which may be good hosts. Steeper and sub parallel to a pipe then just a matter of whether the best conjunction occurs - full or partial.
Given the range in the Paterson Havieron - Telfer - Winu (Not really enough detail available on some and even doubts for Telfer after 50 years) it is likely there will be a range of related but different ore body types.
Point 2 Minyari dome is complex with multiple 'cores' largely defined by magnetics and some outcrop to the north. How well the stratigraphy can be defined in drill core/chips is not something that is well explained in announcements or reports. Probably tough to be definitive. Rio use PXRF at Winu to try and sort out a very monotonous sequence with some level of success. AZY? The doming probably comes with some level of faulting which may or may not be reactivated at times.
Points 3 and 4 may or may not be related. A lot of debate is still ongoing as to the source of mineralisation. While there are many intrusives in the region there doesn't seem to be any significant ones in close proximity to known mines/prospects/deposits except O'Callaghans. The Minyari intrusives may be some of the closer known ones to mineralisation. Havieron has >1Km vertical extent of complex brecciation and is probably a near one off until another is found. Minyari appears to be similar though with less mineral endowment and now appears to be sliced and diced by faulting post mineralisation.
Point 5 The interpretation of normal faulting is OK. However, the stress fields needed for this need to be reconciled with all the above not just the breccia pipe. Do these late, post mineral anyway, faults offset the domal features or sedimentary units? In some way this does not matter as long as the mineralised zone is where it is predicted. Academics can argue about the fine details which AZY geos are almost certain to have some handle on and can probably answer some of the above queries.
Beginning to get a "unified" theory for Minyari Dome. Well done Roger and Co.
(20min delay)