NVA (ASX) General Chat

Originally posted by Grasti: ↑

Hi Danbradster,

There are two types of samples taken during the 'boots on the ground' type exploration phase undertaken by the field geologists.

'Rock chip' samples are taken from bedrock/outcrop and these are taken to get an idea of what minerals/metals are present and to provide a broad appreciation of scale. As you rightly point out, these have not been transported as mobile soil/scree cover. As a first pass sampling program, rock chips are typically taken and these help guide the drilling program.

The other type of samples are 'soil' samples (as opposed to rock chip samples). These can still be fragments of rock, but are part of the soil/scree cover, and hence there is less certainly regarding where exactly they originated from. Obviously the closer to a ridgeline the more likely a soil sample represents the intact rock, as there is less opportunity for that sample to have been transported from someone other than immediately further up the slope. Soil samples from valley floors may have been transported by ice flows (glaciers) or by streams/rivers for samples further down the valley system.

Clearly, just from the perspective of knowing where the sample actually originated (i.e. the level of confidence regarding where the minerals/metals are), rock chip samples are superior to soil samples in this setting.

The ridgeline naturally are better for collecting samples of rock chips (using a geopick/hammer) as there is no scree cover. In some instances, rock outcrop may protrude through scree cover in pockets, and that is where other 'rock chip' samples can be taken. Because these samples are taken by the field geologists using hand tools, samples rock chip samples are only taken where the intact bedrock is exposed and does not require digging down through scree or snow/ice.

You can see that some of the samples are taken below the ridge line. IFthose samples are identified as rock chips, then that is from the intact bedrock. If they are identified as soil samples, then they will be from the scree cover. Two different symbols are used to visually distinguish between these sample types - a triangle and a circle/dot.

Regards.

Expand

So based on this, there's likely only 1 area within the snow cover that has convenient access to outcrop, where we see rocks peeking above the snow (which is why they have just the 1-2 main rockchips from the snowcover area). Maybe around the red circled bit above.

So it's interesting that it shows good grade, but too bad that there's only 1 place to sample in that big snowcover.

Man for scale -

I think some of Train's high grade rock chips came from these particular rocks. Do they have any resemblance to 'High-grade sheeted vein RPM style gold mineralization'? (management's description) -

Maybe like this?

Or this?

Or this?

Or this?

Or this?

RPM North looks different from surface

But RPM-005 shows 'from 7m', so that surface colour may be barely mineralised, just associated / a signal, with the actual mineralisation being the black cores?

Also of note. In the Korbel map, purple means >1g/t. In the RPM map, purple means >10g/t..... Yellow in RPM is equivalent to purple in Korbel (>1g/t).

So green in Korbel is pretty bad (0.1-0.3g/t). Green in RPM is not actually that bad, it's still decent ore (0.5-1g/t). It's teal in RPM that is more marginal (0.3-0.5g/t).