DRE (ASX) Ann: Assays Confirm Yin as a High-Grade Rare Earth Discovery

Originally posted by salpetie: ↑

@GneissDougy
I suspect your last sentence is accurate with the 21Mt being some 3-4 times the quantity present. Would like to be proven incorrect though.
"Please note I acknowledge the above could be completely inaccurate and is for discussion purposes only. DYOR."
The main reasons:
Assuming uniformity - the previous announcement (25/7) does give detail in Table 1: Mineralised intervals as confirmed by an infield preliminary pXRF analysis >0.2% TREO. which need a fair bit of work to crunch down.
I do not follow your volume estimation method. I suspect it is not correct for this style of geometry resulting in an over estimate.
An SG of 3.3 is probably at the upper end of fresh rock only and a lower average value would be better IMO.

I would imagine you are aware of some of these with your emphasis on discussion purposes only.

======================================

I have posted a couple of estimates on the earlier (25/7) thread.
The methodology is basically what I was taught some 50 years ago. It was the way the company did initial estimates. However, we had down hole surveys and more accurate plots than available to us arm chair arm wavers.
A lot has happened since then.... 3D modelling and computing power to crunch the data way beyond the punch cards of those days.

Broad estimates in response to @SwissKid's query.
Like you I initially assumed more uniformity but with a little research of what is given in the announcement this simplistic approach obviously needed modifying. Splitting the area of detail drilling into two domains gave a number of 3.7Mt - as a back of the envelope estimate for discussion purposes.

Subsequently I went into more detail once the assays were announced for Section A (7350200N).
Still very rough calculations with assumptions but probably closer until infill drilling reveals how much variability exists. This effort focused on what may be the best zone, to date, between 7350100-700N and came up with
1.4Mt @ 1.9% TREO for Section A alone with the major assumption being on strike continuity (+-50m for 100m strike length) and SG of 2.5. The width and down dip extent are reasonably constrained. The rapid change in geology within 100m to the south makes the results of 50m infill important.

This post began as a follow up to the 100-700N estimate by looking at the next kilometer or so to the north where drill data are available (7350800-7351925N)

In summary of these latter two posts.

Methodology/Assumptions and individual sections for the northern area are in this rough PDF.

NORTHERN YIN ESTIMATES.pdf

====================================

There are a lot of data to digest.

I have not 'attributed' volume and hence tonnes for some sections where variability is too high and only fenite is reported.

However, the fenite/glimmerite and metasediment reported are all above 0.2% pXRF TREO as per Table 1 25/7 which is something I missed in the above estimates.

If the schematic sections are somewhat accurate then the ironstone/ferrocarbonatite/fenite alteration/glimmerite dykes appear to be relatively variable beasts in terms of on strike, down dip continuity plus variable dips. This has implications for any future mining.
The sections A-F provided by DRE are IMO the best sections to date at Yin. Less uniform sections were not presented....

Potential at Yin
.Assuming a uniform dyke (effectively a slab 1X150X100) with 1m thickness, a down dip length of 150m, Strike extent 100m at 2.5 SG each metre of thickness on 100m section line would be 37,500 tonnes.
Section A at some 30m average thickness would be 1.125Mt + the vertical zone.

Northern end closed off at 7351925N (at present) by 3 holes with no significant intersections of TREO pXRF. The 400+m to the south of this line appear to have only weak fenite mineralisation.

South of 7350000N - Section F shows mineralisation continues though only this has been reported so far.
Suggests very significant potential.
Open pit is the obvious initial approach.
How valuable is a tonne of material with high Nd/Pr and other REE's plus minus Nb?? High enough to warrant UG mining if the host has a size and shape such as Section F and continues to depth?

Section 7350600N might benefit from an UG approach.

Other implications for the thicknesses seen at Yin are there may, just may in pure speculative terms, be a reasonable sized source body of significant size at relatively shallow depth.

========================

Finally the planned drilling for the carbonatite areas C1-5 has been modified a little from the earlier proposal.

Data on this image are georeferenced - schematic yes, reasonable but DYOR especially for the planned drill holes.

Expand

Interesting post. Im not sure where you got your S.G value?

https://vibgyorpublishers.org/content/ijesg/ijesg-6-037-table1.html

No.	Vol.	Price($)
19	6378600	1.7¢

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6378600

1.7¢

Price($)	Vol.	No.
1.8¢	2575727	13

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2575727

No.	Vol.	Price($)
19	6378600	0.017
37	8960055	0.016
34	8355204	0.015
13	2992614	0.014
5	1790730	0.013

No.

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Price($)

6378600

0.017

8960055

0.016

8355204

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2992614

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1790730

0.013

Price($)	Vol.	No.
0.018	2528466	12
0.019	2904382	9
0.020	3733581	15
0.021	983397	6
0.022	976592	4

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No.

0.018

2528466

0.019

2904382

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3733581

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983397

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976592

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Ann: Assays Confirm Yin as a High-Grade Rare Earth Discovery, page-78

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Ann: Assays Confirm Yin as a High-Grade Rare Earth Discovery, page-78

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