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Mine Exploration Forum

Author Underground working around Nantlle
LAP

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Joined: 04/02/2007
Location: Somewhere between Carnforth/Carn-Ffyrdd, and Milnthorpe.

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Underground working around Nantlle
Posted: 16/09/2007 22:15:59
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Hello all!
Nantlle was of course one of the biggest slate areas in North Wales, though it doesn't seem to attract many explorers due to the absence of underground workings.
Is anyone aware of any?

cheers

Linden

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JohnnearCfon

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Underground working around Nantlle
Posted: 16/09/2007 22:40:15
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I have seen an underwater plan (for divers) of Dorothea, and that shows tunnels. Whilst some were to link the varios seperate pits at bottom of main pit. Some seem to go off into the side of the pit, ie not to another pit.

Talysarn pit has a high level adit that goes who knows where!
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LAP

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Joined: 04/02/2007
Location: Somewhere between Carnforth/Carn-Ffyrdd, and Milnthorpe.

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Underground working around Nantlle
Posted: 16/09/2007 23:24:15
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Cheers for that info Big Grin
We all know where Peat's Cafe is in Llanberis. In there there was a picture of some people abseiling into a Nantlle quarry, which wasn't flooded and had some kind of chamber/overhang at the bottom. When we next go I'll check it's name.
On the map of the workings there are also shafts marked, though these are presumably for pumping.


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grahami

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Underground working around Nantlle
Posted: 17/09/2007 11:27:36
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Yes, there are some tunnels which are not flooded. When we were looking at Dorothea and to some extent GalltyFedw. There was a tunnel in the pit at GalltyFedw which ran roughly southwards, with a timber troughing in it to carry water. After some distance I think it started heading for the two pits which had been filled with ***£*))(% plastic waste, so we stopped! There was a shaft down from the surface covered with a steel plate. I believe there were some tunnels at PenyrOrsedd once which connected the surface levels with the sides of the pits.

Graham


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JohnnearCfon

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Underground working around Nantlle
Posted: 17/09/2007 12:12:17
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Mmmmmm, Pete's Eats, lovely Spag Bol, and plenty of it too! IP: 84.13.10.79
LAP

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Underground working around Nantlle
Posted: 17/09/2007 16:18:19
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grahami wrote:

Yes, there are some tunnels which are not flooded. When we were looking at Dorothea and to some extent GalltyFedw. There was a tunnel in the pit at GalltyFedw which ran roughly southwards, with a timber troughing in it to carry water. After some distance I think it started heading for the two pits which had been filled with ***£*))(% plastic waste, so we stopped! There was a shaft down from the surface covered with a steel plate. I believe there were some tunnels at PenyrOrsedd once which connected the surface levels with the sides of the pits.

Graham


Hmm sounds interesting!
I was aware that Dorethea had tunnels in it, though of none that didn't lead to other sincs.
There were of course many pumping shafts, though I wasn't aware of the one Grahami pointed out as being in a tunnel, and rising to the surface. And idea about what it could have been for. Ventelation at I guess, though there wouldn't be much need unless the tunnel was very long.

Slightly off topic, but there is also a longish tunnel at the Chwarel Fawr somplex near Dinorwig. The tunnel lead from Chwarel Fawr to another quarry. I think at some point in the tunnels history an air shaft was risen to the surface to allow better ventilation. This eventually developed into it's own quarry...

Linden

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grahami

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Underground working around Nantlle
Posted: 17/09/2007 16:26:42
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The tunnels at GalltyFedw were something to do with providing water supply to pumping wheels at a lower point - in the middle of a field. I forget now, I'll have to go digging (metaphorically) in my records to find what on earth it was about! It was a long time ago now.

Graham

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LAP

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Underground working around Nantlle
Posted: 17/09/2007 16:40:28
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well, thankyou anyway.. it was most useful!

As for chwarel fawr... the mentioned tunnel went to Domen Fawr, and the small ventelation quarry was known as "chwarel goch".


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BertyBasset

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Joined: 13/12/2007
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Underground working around Nantlle
Posted: 01/04/2019 10:38:48
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Old thread revival alert...

I was having an explore of Pen-y-Bryn and Gallt y Fedw yesterday, when I noticed something a bit suspicious not far from the public right of way heading up towards the wheel pits from the chimney.

Basically, there appears to be a (badly) covered shaft at about SH 5028 5343. It consists of a number of slate slabs and a bit of corrugated sheet across the top. I was standing on the slabs before I realised it actually was a shaft. A dropped stone took 2-2.5s to hit the bottom, suggesting 20-30m depth. I would presume a trial shaft maybe?

Also noted the adit at approx SH 506 535. Nice blog entry at http://robinsonmaps.blogspot.com/2014/03/gallt-y-fedw-slate-quarry-more-nantlle.html

IP: 185.19.209.50 Edited: 01/04/2019 10:39:38 by BertyBasset
SimonRL

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Underground working around Nantlle
Posted: 01/04/2019 11:22:37
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I suspect you were stood at the top of this:



(click image to open full size image in new window)

There's a level from the eastern side of the small pit, it forks after maybe 60m; both are blind ending, the right hand heads off at 90 degrees then turns left again after a short distance and at this point you're at the bottom of the shaft. The level reaches a collapse shortly after.

When I visited I felt the air was unpleasant in there, meant to go back wit the gas sensor but never got around to it.


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JonK

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Underground working around Nantlle
Posted: 02/04/2019 21:28:20
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Simon

Yes this is the shaft that tried to kill me. In 1997 or 98 I abseiled down only to enter CO2 or an area low in oxygen near the bottom. A quick change over and prussicking up about 5m and everything was OK. I will upload a report on the site later.

There is much more to see underground in Nantlle although it is a shame that the 160' shaft at Pen-yr-orsedd has been covered over. I wonder if somebody on this site did it . .

Jon
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JonK

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Underground working around Nantlle
Posted: 02/04/2019 21:30:41
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More efficient that I thought. Pen-y-bryn report was uploaded in 2010. IP: 109.153.129.175
BertyBasset

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Underground working around Nantlle
Posted: 03/04/2019 09:42:45
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I won't be going down that one then. It's nothing to do with the 'contaminated lake' is it? IP: 185.19.209.50
grahami

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Underground working around Nantlle
Posted: 04/04/2019 00:19:34
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I'm guessing JonK's referring to the PYO water balance shaft - but then he's much more familiar with the underground round there than I am so maybe there's another shaft?

Also find below the shaft we found covered with corrugated iron. Sadly I don't appear to have taken a photo looking down it!

Grahami

These were the remains of the water balance shaft many years ago now:
The shaft head:


(click image to open full size image in new window)
Cage Tank used as loco water (G.P.Jones looks on)


(click image to open full size image in new window)
The tank on another occasion.


(click image to open full size image in new window)

The Plas IA crew investigate the mysterious shaft in the boskage...


(click image to open full size image in new window)


(click image to open full size image in new window)


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