| Locality | Latitude | Longitude | Distance | Bearing |
|---|
| Nant a Colliery, Llanfihangel Ysgeifiog, Isle of Anglesey, Wales, UK | 53° 14' 28" N | 4° 16' 44" W | 2.6km (1.6 miles) | |
| Berw Colliery, Llanfihangel Ysgeifiog, Isle of Anglesey, Wales, UK | 53° 13' 37" N | 4° 18' 12" W | 3.2km (2.0 miles) | |
| Morfa-mawr Colliery, Llanfihangel Ysgeifiog, Isle of Anglesey, Wales, UK | 53° 13' 9" N | 4° 19' 5" W | 4.1km (2.5 miles) | |
| Tai Hirion Colliery, Llanfihangel Ysgeifiog, Isle of Anglesey, Wales, UK | 53° 12' 51" N | 4° 19' 26" W | 4.7km (2.9 miles) | |
| Pen-Crug Colliery, Llangristiolus, Isle of Anglesey, Wales, UK | 53° 12' 38" N | 4° 21' 31" W | 5.9km (3.7 miles) | |
| Pont Marquis Colliery, Llanfihangel Ysgeifiog, Isle of Anglesey, Wales, UK | 53° 12' 5" N | 4° 20' 46" W | 6.5km (4.0 miles) | |
| Marquis Colliery, Bodorgan, Isle of Anglesey, Wales, UK | 53° 12' 13" N | 4° 21' 42" W | 6.7km (4.2 miles) | |
| Tyn-y-Flat Colliery, Bodorgan, Isle of Anglesey, Wales, UK | 53° 12' 11" N | 4° 21' 59" W | 6.9km (4.3 miles) | |
| Glantraeth Colliery, Bodorgan, Isle of Anglesey, Wales, UK | 53° 11' 49" N | 4° 22' 36" W | 7.9km (4.9 miles) | |
| Llanddwyn Bay, Rhosyr, Isle of Anglesey, Wales, UK | 53° 8' 22" N | 4° 24' 31" W | 14.5km (9.0 miles) | |
| Penrhyn Mine, Llandegai, Gwynedd, Wales, UK | 53° 12' 26" N | 4° 6' 14" W | 14.8km (9.2 miles) | |
| Parys Mountain Mines, Amlwch, Isle of Anglesey, Wales, UK | 53° 23' 12" N | 4° 20' 39" W | 14.8km (9.2 miles) | |
| Rhos Mynach Mine (Rhos-mynach Mine), Llaneilian, Isle of Anglesey, Wales, UK | 53° 23' 21" N | 4° 16' 53" W | 15.0km (9.3 miles) | |
| Nant Ffrancon Formation, Llandygai, Gwynedd, Wales, UK | 53° 13' 45" N | 4° 5' 2" W | 15.4km (9.6 miles) | |
| Llanllechid, Llanllechid, Gwynedd, Wales, UK | 53° 11' 49" N | 4° 3' 46" W | 17.7km (11.0 miles) | |
| Cook and Ddol Slate Quarries, Llanberis, Gwynedd, Wales, UK | 53° 7' 27" N | 4° 9' 12" W | 18.0km (11.2 miles) | |
| Bryn-havod-y-wern Slate Quarry, Llanllechid, Gwynedd, Wales, UK | 53° 12' 8" N | 4° 3' 7" W | 18.2km (11.3 miles) | |
| Glyn-Rhonwy Slate Quarry, Llanberis, Gwynedd, Wales, UK | 53° 7' 28" N | 4° 8' 47" W | 18.2km (11.3 miles) | |
| Tan-y-bwlch Slate Quarry, Bethesda, Gwynedd, Wales, UK | 53° 11' 33" N | 4° 3' 25" W | 18.3km (11.4 miles) | |
| Tan-y-bwlch Slate Quarry, Llanllechid, Gwynedd, Wales, UK | 53° 11' 41" N | 4° 3' 17" W | 18.3km (11.4 miles) | |
| Moel Faban Slate Quarries, Bethesda, Gwynedd, Wales, UK | 53° 11' 17" N | 4° 3' 24" W | 18.5km (11.5 miles) | |
| Rhoscolyn, Rhoscolyn, Isle of Anglesey, Wales, UK | 53° 15' 28" N | 4° 35' 48" W | 19.0km (11.8 miles) | |
| Marchlyn Slate Quarry, Llanddeiniolen, Gwynedd, Wales, UK | 53° 8' 29" N | 4° 5' 38" W | 19.2km (11.9 miles) | |
| Pant-y-Gaseg Mine, Amlwch, Isle of Anglesey, Wales, UK | 53° 25' 23" N | 4° 23' 24" W | 19.4km (12.0 miles) | |
| Penrhyn Slate Quarry, Llandygai, Gwynedd, Wales, UK | 53° 9' 43" N | 4° 3' 51" W | 19.4km (12.1 miles) | |
| Unnamed Quarry west of Gyrn, Llanllechid, Gwynedd, Wales, UK | 53° 11' 57" N | 4° 1' 52" W | 19.6km (12.2 miles) | |
| Carreg Fawr Mine, Betws Garmon, Gwynedd, Wales, UK | 53° 5' 49" N | 4° 10' 34" W | 19.8km (12.3 miles) | |
| Unnamed Quarry SW of Gyrn, Llanllechid, Gwynedd, Wales, UK | 53° 11' 52" N | 4° 1' 47" W | 19.8km (12.3 miles) | |
| Unnamed workings north of Gyrn, Llanllechid, Gwynedd, Wales, UK | 53° 12' 3" N | 4° 1' 36" W | 19.8km (12.3 miles) | |
| Gyrn Stone Quarry, Llanllechid, Gwynedd, Wales, UK | 53° 11' 52" N | 4° 1' 34" W | 20.0km (12.4 miles) | |
