Mining Plan

[Bamps21]

My take on what Shaun was saying.
He stated a depth of deposit could be 1900m which equates to 1500m of ore.
This would get to a level for bulk mining the EB ( in my opinion it goes deeper though so is only a thought for now).
He’s talking about a conveyor rather than a shaft/ hoist.
This would have to come from a crusher station below the bulk mine.
I can’t see a conveyor being any use for the SLOS until the lower levels near the crusher.
These 2 operations will be completely separate and can run alongside each other in tandem.
He mentioned 32m ton of ore on the conveyor if it goes straight to Telfer. It doesn’t mean it will get that high.
He did say straight but we know it needs zig zags.
The Decline can only take 3mt max and according to the tonnage per year chart it doesn’t achieve that figure.
I think it will be less than the 3mt as he reaffirmed what he said about 40 ton trucks being used so that’s 9 trucks per hour 24/7, 365 days . Seems an awful big task.

I still think it makes sense although it drew a big laugh from him to exit the conveyor into Scallywag.
The length of the conveyor to reach surface would be 11km at 1:5.5 from that 1900m level.
A big undertaking and time.

I couldn’t get him to say they were going to cherry pick the Northern corridor but he did mention cherry picking the EB
Timelines don’t match up with bulk mining the EB and cherry picking.
He did mention that some of the Northern corridor would come out in the SLOS operation and the life of the SLOS extended longer than stated

[Bamps21]

[Bamps21]

this is the mining plan of Red Chris showing the conveyor decline layout.
It can be seen to start from the base of the mine where a primary crusher will be sited.
Note the linking tunnels.
These could be for ventilation or escape ways but in the notes they describe access tunnels linking the straight sections will be excavated for different sections of the Decline to be excavated simultaneously

[Bamps21]

this is the mining plan of Carrapateena mine which is fairly similar to Havieron

The vertical shafts can clearly be seen between the straight sections

Possibility for siting a primary crusher half way down under the SLC level.
That won’t happen at Havieron, the crusher will be at the bottom

[Bamps21]

An underground crushing plant.
The conveyor start position would be below this point which shows how big the cavern has to be for this plant and the feed in point from the top by the boggers

https://www.mogroup.com/insights/blog/m ... -gyratory/

[Bamps21]

These primary crushers are used to crush the ores down in size making the ore size more consistent for transporting.
The initial mining of the ore has a bulking up factor every time it’s moved so crushing the ore reduces this bulking factor.

[poniexpress]

Bamps,
I am at a loss to understand the finer details and terminology (including abbreviations of your excellent inputs in this thread re conveyors etc. No disrespect intended to you and being much too specialized for my non-technical, non-geological brain. I generally leave the mine design etc to those that know what they are about (including yourself) and avoid commenting but I would like to ask you what you would consider to be a safe limit for a working mine depth if it remained open at depth. It probably is unlikely as historical geological events over long time spans eg 200 million years as a guess alters the geological footprint at the time.Perhaps this query should have been included in the general GGP chat category.
Thanks

[Bamps21]

Hi Poniexpress
The Witswaterand mine in South Africa have got down to 3,500-4000m.
The rock pressures have dictated the depths that can be mined and these mines have come to the end of their safe working limits.

The pressures on the side walls of the mine will splinter and shoot out like bullets.
The air is also under great pressure and causes high humidity.

If a shaft is being used you can’t have a vertical shaft from surface passed 1200m I think, due to the cable stresses, so a separate shaft is needed to go deeper down probably to 2400m from surface , so this will be about 2000m of ore maximum.
A conveyor is better for deep mines.

[poniexpress]

Hello Bamps21,
Thanks for answering my question. It helps me understand the present/future situation in relation to the development of Havieron which is important.

[Bamps21]

Three of last weeks drill results look to be expanding the high grade sections in the Western front zones 2 and 3.
I’ve highlighted these on these sketches.
Drill 133 is still targeting the area below the MRE and way below this mining plan.

Other intercepts have been increasing areas behind the Western front into the Northern Corridor increasing the likelihood of extending the stoping into these targets.

The previous results were all about expanding zone 1 the top level.

Will future results be expanding zones 4 and 5 maybe 6

[Bamps21]

Ok where did they get this information from?

[Bamps21]

Callum’s “ C**k and ball “ theory

[Bamps21]

Drill 154 no significant results

[Bamps21]

This is where they’re picking thetheup other information
Those red arrows were the end positions when the results were announced.
153 has been reported this results curling round into the SE crescent, it hasn’t missed it that plan is the top ovoid the lower one extends towards that drill with the drill curling in at the end.
154 has picked up the copper

I’m unsure of what information came from 153 and 155 but more than no significant results

[strudel]

For fans of Callum Baxter's screensaver a moment to gather the family, get the bucket of popcorn and dim the lights for another viewing:

https://www.share-talk.com/callum-baxte ... #gs.7iauap


May 6th 2020 AMEC Sharetalk

[Bamps21]

This section is showing 2 horizontal drives still in the Permian cover.
The first one starts before the fourth ring of the Decline starts.
The second is off the long straight still in the Permian.
Scope there for 2 more gangs to construct these while the Decline continues

[Bamps21]

although this is an old image with 5 rings on the Decline it does show those 2 horizontal drives heading over the ore body

[Bamps21]

A 3D graphic of the production decline can see it clearly by expanding the slide

[Bamps21]

This is an old slide from the environmental report mainly showing how they dealing with the underground water system.
All of this infrastructure is above the ore body, so we can assume from this that we have approvals to complete all this work.

As the decline gets lower into these works you can see opportunities to bring in more machines and gangs to accelerate these works.

You can see on the previous slide where these works are above the ore body.

When the vertical shafts start underground I doubt whether we will get to hear about these.
The only hint we may get of acceleration is the waste rock dump growing in size more rapidly

[Bamps21]

the waste rock dump is just beyond the primary crusher.

This primary crusher will reduce the ore coming out of the mine to a standard size, therefore reducing the bulking factor and enabling more ore to be transported per load to Telfer.
These 2 mounds to the north of the crusher will give us a clue to ore production commencement