Small pit for green slate. Some building remains.
Offshoot of original Ty Mawr Quarry
Publications (3)
- Richards, Alun J. (2013); Slate Quarrying in Wales; Gwasg Carreg Gwalch; ISBN 1-84527-026-6
- Richards, Alun John (1991); Gazeteer of the Welsh Slate Industry, A; Gwasg Carreg Gwalch 978-0863811968
- Richards, Alun John, (1999); The Slate Regions of North and Mid Wales and their Railways; Gwasg Carreg Gwalch; 0863816028
Ty Mawr West - 141m- Nantlle Vale - 141m
- Ty'n y Weirglodd - 199m
- Twll John Ffowc - 282m
- Gwernor - 446m
- Plas Du - 498m
- Tanrallt - 526m
- Twll Coed - 588m
- Singrig - 606m
Gwernor - 626m- Cornwall - 751m
- Twll Llwyd - 779m
- Coed Madog - 787m
- Cloddfa'r Coed - 888m
- Fronlog - 920m
- Taldrwst - 982m
- Dorothea - 984m
- Pwll Fanog - 1,019m
- Tal y Sarn - 1,053m
- Nant y Fron - 1,115m
- Gallt y Fedw - 1,236m
- Blaen y Cae - 1,298m
- Twll Balast - 1,313m
- Allt Llechi - 1,339m
- Tyddyn Agnes - 1,456m
- Cloddfa Lon Twll Mawr - 1,491m
- Ty'n y Llwyn - 1,595m
- Cilgwyn - 1,621m
- Wern Ifan - 1,647m
- Pen y Bryn - 1,773m
- Bryn Castell - 1,894m
