WALKABOUT RESOURCES LTD (ASX:WKT) - Potential Upside of WKT - Expandable Graphite, page-2282 - HotCopper | ASX Share Prices, Stock Market & Share Trading Forum

Originally posted by spid81 ↑

I will save you the effort Croc,

I don't want you coming back with another long-winded post that avoids the question. I am more than happy to help you with your research,

Please also note that WKT strip ratio was 2 to 1 which was based on the Jan 2017 DFS 16.1% contained resource with a 5% cut off, with the company increasing its cut off grade to 10% has resulted in the Strip ratio increasing. Most likely why WKT didn't include this figure in the updated 2019 DFS.

As you can see in the following cross-section which is taken through the inferred resource, the only colours of Ore that will be used is Purple 15%+TGC and RED 10-15% TGC, all other colours Grey, white and Orange are below WKT cutoff grade, or are overburden

Both ore bodies (graphite) slopes (dips) on a 30-40 degree angle with a large section of Biotite Geniess (white) which is right through the middle.

What this means, WKT needs to move the Biotite Geniss (White) and the Orange 5-10% TGC and Grey 5%TGC section, that are all now overburden before they gain access to the higher-grade ore - Red & Purple. (Obviously there will be some high grade at surface)

View attachment 1825918

Did you know, if WKT uses the 5% cut off grade that many of the other graphite companies are using, they have a very similar TGC% as many of the other Tanzanian companies and a similar amount of contained carbon, I am sure you already know all of this, similar to you know that WKT's strip ratio is nearly 4-6x more than other similar companies.

BTW, I noticed in that latest T40 list that the T40 had reduced their holding by 1 mil over a 20 day period. Do you know who this was? was it one of the T40 members who helped appoint Mike Elliot?

Here is the Investing News explanation on Strip ratio's, It might help you.

A strip ratio, or stripping ratio, is an important measurement related to the open-pit mining process. It represents the amount of waste material, also known as overburden, that must be moved in order to extract a given amount of ore.

Calculating stripping ratios

At their most basic, strip ratios can be calculated by dividing overburden thickness by ore thickness. For example, an overburden thickness of 100 meters and an ore thickness of 50 meters would yield a strip ratio of 2:1. That means mining 1 cubic meter of ore would require mining 3 cubic meters of overburden.

https://investingnews.com/daily/res...ip-ratio-western-copper-gold-nemaska-lithium/
2017 DFS Strip Ratio of 2 : 1
https://www.asx.com.au/asxpdf/20170207/pdf/43ftxj4sw4gg94.pdf
2019 DFS - No Strip Ratio
https://www.asx.com.au/asxpdf/20190307/pdf/4438vk96dh2yw4.pdf
Cross Section
https://www.asx.com.au/asxpdf/20181219/pdf/441c1cnppvnt6m.pdf

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Hi spid81 happy to debate this...

Strip Ratio

High strip ratio along with higher cut off grade reduce capex cost...Separate your mining level cost to mill level cost...Keep in mind at mining level the operation is a daily cost while Mill level is an upfront cost....Start up Capex of plant.

Quality is a consideration in strip ratio.If a deposit contains low grade quality ore more of it must be mined in order to achieve a return on investment. A higher grade deposit can support a higher strip ratio. There is an inverse relationship between deposit grade and strip ratio. The higher the grade inversely reduces plant capex and ROM of mine.

The higher the grade inversely reduces plant capex and ROM of mine

Walkabout Resource raised there strip/ratio level from 2:1 of previous DFS now to 4.4:1 over life of mine...At the same time they increased the cut off grade...There is little point raising strip ratio if you can not increase the cut off...10% TGC below this is now considered to be waste material of no value...

4.4 plus 1 Tons of material are moved for 1 ton of concentrate...Importantly the concentrate of value is all greater than 10% TGC...We have 24 year life of mine with 17.9% TGC average

Previously with out the high grade extension from surface our strip ratio was 2:1 while cut off was lower...Increase the strip ratio increase the cut off and only process higher grade material...The rest is treated as reserves....

Why would they do this....?

Only Walkabout Resource can do this which may explain why some posters have failed to grasp the select mill feed strategy...

While other projects have lower strip ratio they also have a low uneconomical cut off....IMO

From my previous Strip ratio post mining level activity varied from $13-25 dollars per ton of material moved...To max this out an 7:1.1 would only cost $200 per ton of feed concentrate at a grade of greater than 10% TGC....

Where it matters is capex of plant...

Thru put and high feed grade advantage....

Project A

1000 tons x 5 % TGC with LOM 2:1 strip ratio and cut off at 2 % TGC and LOM at 3.3% TGC
with recovery at 90% yield...29.7 tons
Mining level cost $75 (3 x 25)

Project B

1000 tons x 20% TGC /LOM 4.4:1 strip ratio and cut off at 10 % TGC /LOM at 17.9% TGC
with recovery at 90% yield...161 tons
Mining level cost $135 (5.4 x 25)

Scale this up and it is there for all to see the intrinsic value of high strip/ratio higher cut off advantage projects....We treat grades of 10% TGC as waste not ore which is expensive to process...projects to date have not secured funding with capex to high...

Our project starts in high grade with only 10 meters of over burden for life of mine at an 8 % cut off...

Croc