Series of small pits and ruined buildings which may have been worked together or separately at different times - includes:
- Taldrwst Isaf SH486524
- Taldrwst West SH486517
- Taldrwst Uchaf SH487519
- Twll Melia SH483525
Publications (2)
- (1988); WMS Newsletter Issue 18 May; 12 pages
- Richards, Alun John (1991); Gazeteer of the Welsh Slate Industry, A; Gwasg Carreg Gwalch 978-0863811968
Nant y Fron - 141m- Fronlog - 283m
- Twll Llwyd - 315m
- Singrig - 423m
- Twll Coed - 454m
- Tyddyn Agnes - 479m
- Tanrallt - 528m
- Plas Du - 564m
- Ty'n y Llwyn - 754m
- Ty'n y Weirglodd - 804m
- Ty Mawr West - 941m
- Ty Mawr Green - 982m
- Bryn Castell - 1,074m
- Nantlle Vale - 1,115m
- Coed Madog - 1,166m
- Twll John Ffowc - 1,250m
- Cloddfa'r Coed - 1,380m
- Gwernor - 1,428m
- Cornwall - 1,483m
- Pwll Fanog - 1,563m
Gwernor - 1,608m- Tal y Sarn - 1,668m
- Dorothea - 1,835m
- Allt Llechi - 1,961m
- Gallt y Fedw - 1,997m
