Twll Mawr

United Kingdom / Wales / Caernarfon

Quick Info

Country United Kingdom 🇬🇧
Rock type Slate
Climbs
Sport routes 3 (9a to 9a+)
Trad climbs 7 (HVS to E8)

Quick Info

Country United Kingdom 🇬🇧
Rock type Slate
Climbs
Sport routes 3 (9a to 9a+)
Trad climbs 7 (HVS to E8)
Contributors
89 contributions since 23rd December 2020.
47 contributions since 13th September 2025.
2 contributions since 11th July 2025.

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Library


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Climbs

10 recorded climbs.

Year Climb Grade Climber Style Date
First ascent.

Originally given E6!

First ascent. With Bob Drury.

For god's sake, are you a foothold or not?! [2][3]

Johnny climbed the first 2 pitches on the 10th september and the second two pitches on the 11th september. He later climbed the route in a single push.

References

[1] https://www.youtube.com/watch?v=lLyF8zcP674

[2] Llanberis Slate. United Kingdom: Ground Up, 2011.

[3] Mountain Issue 112, page 18 /library/11111/mountain-112

First ascent.

References

[1] Mountain Issue 112, page 18 /library/11111/mountain-112

1987
1988–1990
1991
First ascent.

With M Thomas

1993
1994–2008
2009
2010 Slip of the Tongue E6 Pete Robins Lead | worked Nov 2010
First ascent.
First ascent.

I did it on a whim really. We got to the top of the Quarryman groove and I thought what can we do? I’ve done all the existing lines before so I thought I would just go for the traverse line. I got across and suddenly found myself bridging on poor smears, hanging on an edge and having to dyne (sic). At one point I had to sort of layback on the cheek of my face so I could swap hands on a hold. It was very tricky. [1]

Neil Dyer:

It was desperate, we couldn’t really do the moves on the crux. Fair enough we had a sneaky beer on the belay which always takes your edge off, bt still; it was so hard and then run-out after the hard bit was outrageous. Johnny clipped the Fire Escape bolts and then that was it, all the way to the Blockhead belay!”

References

[1] Slate Historical Section

First ascent.
2013
2014–2020
2021
First ascent.
First ascent.

Unusually, Franco used a knotted rope to protect the lower section of the route (before it joins The Meltdown) as he didn't want to place any bolts.

References

[1] https://www.instagram.com/p/Cy3dUaztBFm/

[2] Interview with Rob Greenwood, October 2023 https://www.youtube.com/watch?v=BkWSzo61Lwk

[3] https://ukbouldering.com/board/index.php/topic,33764.msg684096.html#msg684096

Climb Grade # Recorded Ascents Ascents Recorded Between
The Meltdown Direct 9a+ 1 1st April 2022 – 1st May 2022
The Dewin Stone 9a+ 1 26th October 2023
The Meltdown 9a 5 1st January 1985 – 5th June 2023
Climb Grade # Recorded Ascents Ascents Recorded Between
The Quarryman E8 7 10th September 1986 – 26th July 2025
Coeur de Lion E8 3 12th March 1986 – 1st May 2015
The Firé Escape E7 2 22nd September 1986 – 18th June 2024
King of the Mezz E7 1 1st May 2011 – 1st June 2011
Blockhead E7 1 1st January 1992 – 1st January 1993
Slip of the Tongue E6 1 1st November 2010 – 1st December 2010
Opening gambit HVS 1 1st January 1971 – 1st January 1972