NVA (ASX) Ann: Further Visible Gold Intersected at RPM

Originally posted by danbradster: ↑

Below, I put the geology on top of a satellite image, with varying transparency. To note how the topsoil varies by area.

Below I marked some areas as High Grade, Medium, Low or Low-Medium, again noting how the topsoil related to grades.

The RPM Mid inferred zone looks fairly interesting. Only a couple of holes entered that area,

Not bad. Around 1g/t (which generally beats RPM South).

Point of note: the topsoil looks pretty continuous to me (remembering how RPM North shows a clear band of different coloured topsoil). As in, RPM Mid could be big? The inferred resource includes just a portion of that Mid area.

And doing some very rough estimating from the below image. RPM North (right) and RPM Mid (Left). RPM North has good grades, but thins out at depth (but luckily has decent width near surface). RPM Mid appears a lot larger, and with some decent grades like 1g/t so far. Maybe the width could add up to something significant.

The geology is something like this:

So Mid would become quite big if it did in fact connect to RPM South, and from a prior diagram, it looks to be 'at surface' too (inferred to be). So interesting potential, especially with grades superior to South (so far).

And then I threw a question mark above North. Why is the light band of dirt clearly visible on that side of the mountain too, but I see not drills pointed North through that area? Could be just top-soil rolling down the mountain and nothing underneath, but were there any drills confirming nothing there?

-004 passes through it a little bit. It didn't seem to hit anything amazing - 405m @ 0.4g/t inc. 259m @ 0.5g/t from surface

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Hi Dan,

Thanks for all your work here.

I further marked up one of your images with some grades from the surrounding holes, as I wanted a visual guide to wrap my head around how a decent, to high grade hit might affect the resource number in that area.

My amateur conclusions are that it may be quite significant, and that I don't think the market has priced that in yet.

The main reason I come to that conclusion is because of how little gold in a metre of core it takes to produce a big g/t number. We don't have a good idea of how that gold continues throughout the core, or whether we can see most of the gold, so we cant assume the random sample size I use based in fact, but even if it ended up being only 1/4 of it, it's still significant.

If we take 1m of 63mm core, and assume an SG of 2.9, we come out with a little over 10kg of rock. If the gold that metre of core contained was equivalent to a cylinder (of solid gold) measuring 3mm in height, and 2mm in diameter, it equals around 1.8g (when you account for the 19.3 SG of Gold).

Extrapolate that hypothetical number out, and you get a meter of core with around 180g/t. Now will ours be 20g/T? Will it be 200g/t? Time will tell.

Let's say we are very lucky and get just 1m with 100g/t, along with an average of those other holes of let's say a conservative 0.7g/t, and over a length of 170m.

In this100g/t hypothetical, just that small section of gold upgrades that whole 170m to be 1.28g/t. Likely expanding higher grade area, and maybe even dragging up the average grade of the whole resource by a pip.
Negatives? I (and others) have previously been positive about it being close to surface, and while that makes it easier to get to, it would be better in resource terms for it to be further away from the existing indicated resource. Also, we likely need to put another hole either side of 043 to get any of it to indicated.

Obviously not advice, and let me know if any of my maths is wrong!