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Mine Exploration Forum

Author United Downs Deep Geothermal Project
Roy Morton

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Joined: 09/10/2007
Location: Redruth Cornwall

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United Downs Deep Geothermal Project
Posted: 29/10/2018 21:54:17
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Things are moving at the site with the arrival of the drilling rig.
The rig is still in the process of setting up and drilling is scheduled to start very soon.
The first hole will be 24" diameter and eventually reducing to 8" at the final destination.
2 holes will be drilled. The injection hole will be 2.5km (1.55 miles) deep, with the production hole deeper at 4.5km (2.8 Miles) deep.
There's details about the project online but not a great deal. Information about 'Fracking' of the target zone has not been mentioned. Roll Eyes



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"You Chinese think of everything!" "But I''m not Chinese!" "Then you must have forgotten something!"
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The Fresh Prince of Portreath

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United Downs Deep Geothermal Project
Posted: 30/10/2018 10:24:07
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So, all of the fluccans (in killas) are going to go down into granite, where they will be uncemented fracture zones with a massive area for heat exchange.

It's a shame with all of these things, there is a man in a shiny suit using lots of words like "low carbon" and "sustainable" and lots of Tony Bliar style hand signals. I'd love to read their interpretation of the records and explain what their thinking is.

I haven't looked at the site to know exactly where it is, but I've seen the rig and it seems to be sort of "behind" the Poldory area (in an area which hasn't been mined).

Presumably, their hypothesis is that all of the minor crosscourses will coalesce into a massive joint at depth. Looking at section 3 of 4 (0500E-1600E Sheet 3) of the New Jane plans, it appears that there are several things between them and the county crosscourse (which presumably is their target).

The trio of fluccans in Tingtang are neither here nor there, and presumably, the two in Wheal Squire aren't either. Odgers Fluccan, which separates Wheal Squire from United is quite a major thing and the whole Poldory section is an absolute swarm of crosscourses/fluccans. Presumably, these all join like a hand and coalesce in depth. One thing appears to be certain, they are going to run into the Poldory Fluccans (and be drilling, presumably sort of down dip - ish). I wonder what the nature of the ground will be (cemented/uncemented/open fracture/breccia) and how that will respond to their drilling.

I can't say I've read anything which hints at the nature of these structures at depth, but if they can get a suitable area for heat exchange, they will no doubt get very very good results. How this will work with other stuctures (more minor than the county xc) is anyone's guess. I think it's a properly good project and unlike many others seems to have success in it's sights, rather than shiny suits and white rangerovers for the criminals promoting the scheme.

Talking of which, stand by for the lithium. LITHIUM FOLKS, BUY MY SHARES, THE WATER IN THE GEOTHERMAL WELL IS FULL OF LITHIUM. PUMP PUMP PUMP can I have a gold coloured rangerover with white leather seats and blacked out windows please! I imagine it will be enough for him to get a massive EU grant to spend on himself and his pals.
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Roy Morton

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United Downs Deep Geothermal Project
Posted: 30/10/2018 12:01:39
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They propose to eventually use water from the old mines in the area, which they would surely need to buffer, if only for the sake of their equipment.
I wonder what other additives will need to be thrown in to ensure that the fractures don't gum up? There's a lot of dissolved solids in mine water, especially once you start moving the stuff around.


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United Downs Deep Geothermal Project
Posted: 31/10/2018 21:45:19
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As we know, there are some funny things going on with the adits in the area. Tingtang being flooded to shallow adit.

I would have thought the pH and lack of oxygen in the water would have effectively made their drill string soluble.

Time for some brass kit Nangiles style.
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Nicho

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United Downs Deep Geothermal Project
Posted: 29/09/2019 14:19:20
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Are you sure you're using the term 'fluccans' in the right context? My understanding is that 'a fluccan' is a lens of clayey material in the country-rock, often found in the lode but not necessarily, and in places in faults or crosscourses. But I'm not aware that a fluccan necessarily goes the full depth or length of a fault, where the most likely material would be brecciated country rocks and lenses of fluccan, with loads of water of course. IP: 86.157.177.39
Nicho

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United Downs Deep Geothermal Project
Posted: 29/09/2019 14:22:41
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Actually, they have mentioned it, quietly of course, as they have a system of monitors set up to monitor any minor seismic activity. IP: 86.157.177.39
Morlock

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Joined: 31/07/2008

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United Downs Deep Geothermal Project
Posted: 30/09/2019 19:33:34
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You have mail.Smile IP: 81.135.122.15
The Fresh Prince of Portreath

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United Downs Deep Geothermal Project
Posted: 02/10/2019 22:48:51
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Nicho wrote:

Are you sure you're using the term 'fluccans' in the right context? My understanding is that 'a fluccan' is a lens of clayey material in the country-rock, often found in the lode but not necessarily, and in places in faults or crosscourses. But I'm not aware that a fluccan necessarily goes the full depth or length of a fault, where the most likely material would be brecciated country rocks and lenses of fluccan, with loads of water of course.


On both the modern Wheal Jane composite plans of the area, as well as those from R103 (United Downs) they are called cross courses, or fluccans, depending on what they are. Have a read of Thomas' Camborne to Chasewater mining district. There is quite a good breakdown of the terminology as applied to that immediate area. It varies a bit, but Odgers Fluccan, which was a major one (off the top of my head) separates wheal squire from united mines and was basically a seam of clay associated with the movement and structure of the county crosscourse.

Since all of this was formed at very considerable depth, it is odd how a bit further down, it's just fractured with no real brecciation/pulverisation of note.

Having picked up my Thomas volume, it appears that many Crosscourses are referred to as "quartz and clay" and the fluccans are just clay, but some crosscourses are just clay.

According to Collins (1912) Fluccan or "miners putty" is a clayey deposit filling the walls or minor fissures in lodes.

Obviously, the true definitions have waggled around a bit.

The one I use is that a crosscourse is a quartzy one and a fluccan is a proper clay seam. When I say clay, I mean very very fine plasticey clay and in a proper vein.
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Nicho

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United Downs Deep Geothermal Project
Posted: 03/10/2019 11:58:03
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Ah, ok. I've only ever come across it describing clay-filled lenses or pockets, either referred to as 'fluccan' or 'a fluccan', depending, I suppose, on how large. Sometimes called 'floocan'? Excellent example in a long level near St Neot. IP: 86.157.177.39
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