AUR (ASX) Ann: Quarterly Activities Report

Originally posted by Blythefan ↑

OK, so WDD003 started south of the interpreted reverse fault.
The fault is dipping south. The drill hole deflected north (doubtless due to the influence of the fault).
The hole penetrated the fold, and the core of basalt within the guts of the fold from 210 to 436m (226m of basalt). Either side is magnetite altered Ravelstone (but, equally, Thaduna greywacke derived from weathering of the narracoota; same-same).
The basalt is described as hyaloclastic (Noonyereena member; the good shiz according to Pirajno)
The veining is from 294 to 436 (again, the section says 42m, the text says 142m, same-same?).

The veining matches the basalt intersection fairly well; therefore the chalcocite-bornite-native copper (which is new data; suggests very low sulphidation!) bearing quartz-carbonate veining is constrained to the fault zone as it transects the basalt.

This fits the Thaduna deposit style extremely well; in Thaduna the reductive trap was the "graphite alteration"; chemically reductive bitumens that caused the low-sulphidation copper mineralisation to drop out of solution and form chalcopyrite, which got upgraded to bornite, then chalcocite with depth. This is a form of zone refining. The sulphur content says the same but more and more copper is added...until you get native copper.

So, this deposit here is hosted where the fertile fault crosses reductive lithology (basalt). The fault is portrayed as dipping south; more copper is to be found at depth. This is what happened at Thaduna.

So, the orientation (under this seat-of-pants model) is steely south dipping sheet of mineralisation, of unknown thickness (suggest 10-20m max), which is X metres tall and ~150m wide east-west. Though, if the fold thickens with depth, this would thicken at depth. Plus, the repeated structure to the south would be a prospective place to look.

I reckon they need to see what the DHEM says (a E-W oriented, south-dipping plate would half confirm this model), then zing a hole through the cross-fault and test it and see what the true thickness of the structure is. Time to get away from testing stratigraphy and test structure.

Expand

Thanks Blythefan. Your analysis is logical, and persuasive too,

Copper is copper ain't it, regardless of how it is 'made', so the company just has to pursue this and put the vms aside until the 'other stuff' has been thoroughly examined

You use the adjective 'reductive' preceding 'trap' and also 'lithology'. Could you please elaborate on this please. What does 'reductive' mean in these 2 contexts? It appears to mean the same in both contexts, just different geological situations. Right?

'Reduction' is the noun?

Also, are you saying suggesting that Thaduna is just analogous (reductive ....) or are you suggesting that it is similar in creation (ie same sort of rocks, age, mineral development etc)? Hopefully you get my drift!

Karl S gives Thaduna a favourable mention in this 19/10 story in The WA newspaper.

https://thewest.com.au/business/min...er-inventory-boost-for-sandfire-ng-b88633670z

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Thanks Blythefan. Your analysis is logical, and persuasive too,...

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