I guess if it's not VMS it's a play on shear hosted Cu-Au like Deflector / Gullewa.
22Kt back of the envelope "resource" isn't anything.
The reason WGX wasn't interested?
1) Copper, particularly oxide and transitional, is a killer for Au recovery. See, for instance, DRM's Gullewa project and it's protracted and sordid backstory. Also see CRB (which I hold an interest in; full disclosure) which is dealing with oxide Cu and Au at Mt Morgans, from a different perspective.
Realistically, if you threw Chunderloo ore in with the ore at bluebird, it would sterilise 10 times as much gold as you'd get out of it. It is metallurgical suicide. So why would Westgold hold onto a property with ore that does't accrete value? The tenements also require working, so if you can't make money from it, and it's costing you money, and you are producing gold for (nominally) $40/Oz margins....why hold it? It's not a sensible property to just drop (looks terrible to just drop tenements) and your rehab costs might suck as well. So, good, pragmatic move by WGX.
2) The scope of the system is clearly not yuge. I made the same gripe on THX up at Red Boring; postage stamp tenements with lots of drilling equals a dead horse. THX's management disagrees with me, which is their prerogative, but at least in this case not much has been done on the property since 1994, aside from Mercator chucking out a lo-fi "resource"
3) The scope of the system doesn't meet WGX's needs. WGX needs to replace 150-450K Oz per annum in resources. Unless Chunderloo got real coherent real quick at 5g/t and lost the tricksy copper, it wouldn'tkeep the Bluebird mill going and wouldn't be NV accretive.
The only negative for Auris is that they didn't flog >5% of their market cap to WGX to extinguish the first right of refusal - that would lock WGX in as a holder until the next dilutative raising. Now, WGX can clear off $325K in shares and no one will know about it. Though, that's 5 days turnover, so....plus ca merde...
As for the geology, well, 'amphibolite' is a grab bag that could mean any form of mafic. If Chunderloo is in dolerites vs basalts, and there's no evidence of VMS based on the forthcoming mapping, then VMS goes out the window. But at this stage we don't really know what the geology is, the pathfinder association, etc.
As said elsewhere, there's a lot made by laypeople about pathfinder elements. in this case, the fact there is no data means that it is appropriate for Auris to go see if there are any. But that's a test of the hypothesis that this is a VMS; the hypothesis can be tested by mapping, petrography and testing the geochemistry to see if it has the hallmarks of a VMS system or it is something else (shear hosted Cu-Au, for example).
Like anything, just because they go looking (ith pXRF or otherwise) doesn't mean much. It's premature to get excited about VMS prospectivity before evidence is presented to confirm it.
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VMS's aren't common. Not as common as lode gold. The largest VMS's are in phanerozoic successions (eg; Tasmania, and Iberian Pyrite Belt), but there's a few large ones in the Archaean in Canada. In terms of Western Australian Archaean settings, the major VMS clusters are;
Golden Grove
North Pilbara eg; Whim Creek
East Pilbara eg, Kangaroo Caves / Panorama
Jaguar
South Pilbara (Whundo, etc)
Nimbus (mostly Ag, Hg)
There's a couple of dozen subeconomic occurrences eg, Mt Mulcahey, Austin, 3-4 peripheral systems in the Golden Grove area, 3-4 around Jaguar, 5 or so around Whim Creek, 3 around panorama, etc, which amount to <100Kt mineralisation or are subeconomic in grade or have insufficient metal to justify a development. Even Whim creek right now is subeconomic and the play is to socialise the Panorama ores with Whim Creek / Salt Creek sulphide ores and maybe make it work via magic road trains.
It's a tough gig.
Hell, even the Proterozoic VMSs are a tough gig aka Bryah. There's probably 8 or 9 systems (Horseshoe, Wodger, Big Billy, Forrest, DeGrussa, Monty, Cuba at a stretch, Orient maybe, maybe Labouchere area) and 2 are mines and 1 is a resource. That's actually reasonable success rate, but discovery is hard.
So being brutally honest...you're better off going to Spain than picking up a postage stamp at Meekatharra.
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