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Seems there are a few newer faces around at the minute, so in case any of you haven't seen this and are interested in it to try to get an idea of what may be expected from the remainder of the iron ore results, I thought I would bring the thread back to the top.
I'm happy to answer any questions I know the answers too, or for this to open up discussion to correct me - I can't share images very easily here, but if you wanted to see an image of the mapping let me know and I can try to put somethingg clear together for visual support.
https://www.bloomberg.com/news/articles/2021-05-10/iron-ore-turns-very-very-hot-as-prices-jump-10-in-minutes?sref=frV97TwV
Nice work EWT! It’s clear you spent alot of time and effort on this. Thank you for sharing.
EWT great piece of work very interesting read.
Let’s see what next week brings.
944T
Message 3 of 3:
- The Weeli Wolli Formation hosts the Roy Hill Area which hosts a number of deposits of note:
1) Yandi/BHP – 85% owned by BHP, 8% CI Minerals Australia Pty Ltd, 7% Mitsui Iron Ore Corporation – has produced over 1 billion tonnes of iron ore at around 58% Fe.
2) Marrilana Creek Project owned by Brockman Mining, which has Direct shipping ore of 101.9Mt @ 55.6%, and 1,528Mt @ 42.6%.
3) Yandicoogani Hammersley Iron Mine; owned by Rio Tinto 100%; been in production since 1998, with a remaining resource of 488M@61.7% Fe, 238Mt@57.7% Fe and 62Mt@56.9% Fe in 2015.
4) Iron Valley Mine, mined by Mineral Resources, royalties paid to BCI Minerals; 182Mt mineral resource @58%Fe and 82.3Mt @ 58.2% Fe.
I have struggled to interpret results too much, as we have not been told which holes apply to where other than one hole – which has a 66m BIF intersection, and is formed on dolerite (as mentioned above tends to host higher magnesium and iron content), and is associated with Weeli Wolli Formation, but I hope this does help some of you - if anyone has any questions or any points of debate, or any knowledge/corrections please feel free to add to this.
Message 2 of 3:
The Kalgan Prospect where we have drilled looks to be formed along a thrust – a type of fault line – this typically pushes older strata over younger strata. This is formed over Weeli Wolli formation whereas the Kalgan Prospect is formed over Bolgeeda Iron Formation, however both are formed on a thrust. On our prospect the upthrown side is in our tenement, which means at the correct angle, as the stratigraphic sequence is generally replicated, we may have deeper, accessible iron ore reserves here – these are the areas that banded iron formation has been located by the team.
In terms of the rest of the areas we have drilled and where iron ore has been identified, I’m actually very hopeful for these areas;
1) The C-D-E Prospect, the C line (look at Figure 4 of the last RNS);
The C line follows the exposed fold (anticline) which runs right along the Weeli Wolli formation across our tenement.
E line follows an exposed fault (similar to the Sirius Deposit, but again on Weeli Wolli vs Bogleeda formation) and again runs right across our tenement which opens up the chance for extended strike similar to C. However, this does dip into Woongarra Rhyolite formation which reduces the chances of significant iron ore (at least DSO grade) reserves further along strike I would guess.
Line D is in between these two lines, and appears to be offering up strong grades of iron ore, however I can’t offer anything beyond this in terms of geological significance other than it again being formed on Weeli Wolli formation.
2) The southern-ridge prospect, if shown to have iron ore could extend back to the edge of the tenement (on the west side), as it looks to be formed along another exposed thrust, on the south side of Woongarra Rhyolite where it merges with Weeli Wolli, with the upthrown side on the side of the Weeli Wolli formation – which, from what I can tell improves the chances of high grade iron ore formation.
These are all just my observations, I am not qualified in geology so I do not know the ins and outs, verify all of this on your own research and don’t rely on it, but it could give some of you inspiration on where to go – I am happy to be corrected on any of this, by anyone with more knowledge on the subject.
A couple of notes:
- It is not impossible to find a resource on top of Woongarra Rhyolite, so don’t rule it out, it just appears less likely – Brockman Mining have a tenement to the north-west formed on Woongarra Rhyolite bedrock called Coondiner (consisting of Pallas and Castor), which it a 108Mt @ 58.3%.
Message 1 of 3:
Good evening guys, this may seem a bit uncoordinated/unstructured as a piece of research, but here are my thoughts on what we can expect from the iron ore assay results for Hanc0ck based off geological evidence surrounding our tenement.
The first thing to know is how the Hanc0ck prospect is formed in terms of its geology. The area consists of three types of bedrock formation roughly speaking:
1) Boolgeeda Iron Formation – This is a formation exclusive to the Western Australia, and consists of deep to shallow iron-rich sedimentary successions. This makes up a number of deposits around us including the Sirius Deposit and Kalgan Creek Deposit, also to note Rio also own a 532Mt 57.9%Fe deposit hosted in Bogleeda Iron Formation (the Poonda Deposit).
2) Woongarra Rhyolite – tends to have very silica content and not much good in terms of iron ore formation typically.
3) Weeli Wolli Formation – Consists of thick banded iron formation (BIF), which is commonly jaspilitic (a compact siliceous rock rich in hematite and resembling jasper), mudstone, siltstone with common metadoleritic sills – these ones have numerous dolerite sills.
For those looking for an explanation for this, here is a brief one:
Acidic rocks such as granite, microgranite and rhyolite are rich in silica and contain the minerals quartz, feldspar and biotite among others. Basic rocks such as gabbro, dolerite and basalt are poor in silica and contain the minerals olivine, pyroxene, feldspar and/or quartz among others; they are also rich in the metals magnesium and iron and are often described as “mafic”.
** Disclaimer: I don’t know how important the bedrock formation actually is, however from research there seems to be at least a reasonable level of significance. **
As we’ve heard, a lot of the remaining holes contain assays for areas where Banded Iron Formation is believed to be, BIF consists of finely interstratified chemical sediments rich in iron oxides, carbonates and/or silicates and have strong correlations in terms of location to the worlds largest iron ore bodies.
The Sirius Deposit is formed on Bolgeeda Iron Formation which slightly extends into our tenement (the Sirius Extension), however this is a smaller area than I earlier realised – there is likely further DSO iron ore across the top very slightly further, before it runs into Woongarra Rhyolite, so very unlikely to be any further iron ore in this area of the tenement, though there are higher grades to the west than I would have expected from drill holes already done – maybe slightly further north would have struck further DSO, but we know not to drill further down for DSO grade ore if that is the target for now.