| Locality | Latitude | Longitude | Distance | Bearing |
|---|
| Penrhyn Slate Quarry, Llandygai, Gwynedd, Wales, UK | 53° 9' 43" N | 4° 3' 51" W | 0.0km (0.0 miles) | |
| Marchlyn Mawr, Llanddeiniolen, Gwynedd, Wales, UK | 53° 8' 9" N | 4° 4' 8" W | 2.9km (1.8 miles) | |
| Moel Faban Slate Quarries, Bethesda, Gwynedd, Wales, UK | 53° 11' 17" N | 4° 3' 24" W | 2.9km (1.8 miles) | |
| Marchlyn Slate Quarry, Llanddeiniolen, Gwynedd, Wales, UK | 53° 8' 29" N | 4° 5' 38" W | 3.0km (1.9 miles) | |
| Tan-y-bwlch Slate Quarry, Bethesda, Gwynedd, Wales, UK | 53° 11' 33" N | 4° 3' 25" W | 3.4km (2.1 miles) | |
| Tan-y-bwlch Slate Quarry, Llanllechid, Gwynedd, Wales, UK | 53° 11' 41" N | 4° 3' 17" W | 3.7km (2.3 miles) | |
| Llanllechid, Llanllechid, Gwynedd, Wales, UK | 53° 11' 49" N | 4° 3' 46" W | 3.9km (2.4 miles) | |
| Cwm Ffrydias Quarry, Llanllechid, Gwynedd, Wales, UK | 53° 11' 30" N | 4° 1' 33" W | 4.2km (2.6 miles) | |
| Cwm Ffrydias Trial Mine, Llanllechid, Gwynedd, Wales, UK | 53° 11' 33" N | 4° 1' 22" W | 4.4km (2.7 miles) | |
| Bryn-havod-y-wern Slate Quarry, Llanllechid, Gwynedd, Wales, UK | 53° 12' 8" N | 4° 3' 7" W | 4.5km (2.8 miles) | |
| Unnamed Quarry SW of Gyrn, Llanllechid, Gwynedd, Wales, UK | 53° 11' 52" N | 4° 1' 47" W | 4.6km (2.9 miles) | |
| Unnamed Quarry west of Gyrn, Llanllechid, Gwynedd, Wales, UK | 53° 11' 57" N | 4° 1' 52" W | 4.7km (2.9 miles) | |
| Gyrn Stone Quarry, Llanllechid, Gwynedd, Wales, UK | 53° 11' 52" N | 4° 1' 34" W | 4.7km (2.9 miles) | |
| Dinorwic Quarry, Llanddeiniolen, Gwynedd, Wales, UK | 53° 7' 22" N | 4° 5' 59" W | 5.0km (3.1 miles) | |
| Unnamed workings north of Gyrn, Llanllechid, Gwynedd, Wales, UK | 53° 12' 3" N | 4° 1' 36" W | 5.0km (3.1 miles) | |
| Penrhyn Mine, Llandegai, Gwynedd, Wales, UK | 53° 12' 26" N | 4° 6' 14" W | 5.7km (3.5 miles) | |
| Glyn-Rhonwy Slate Quarry, Llanberis, Gwynedd, Wales, UK | 53° 7' 28" N | 4° 8' 47" W | 6.9km (4.3 miles) | |
| Cook and Ddol Slate Quarries, Llanberis, Gwynedd, Wales, UK | 53° 7' 27" N | 4° 9' 12" W | 7.3km (4.5 miles) | |
| Nant Ffrancon Formation, Llandygai, Gwynedd, Wales, UK | 53° 13' 45" N | 4° 5' 2" W | 7.6km (4.7 miles) | |
| Cedryn Slate Quarry, Dolgarrog, Conwy, Wales, UK | 53° 9' 13" N | 3° 54' 58" W | 9.9km (6.2 miles) | |
| Britannia Mine, Beddgelert, Gwynedd, Wales, UK | 53° 4' 16" N | 4° 3' 57" W | 10.1km (6.3 miles) | |
| Carreg Fawr Mine, Betws Garmon, Gwynedd, Wales, UK | 53° 5' 49" N | 4° 10' 34" W | 10.4km (6.5 miles) | |
| Ystrad Mine (Silurian Mine), Betws Garmon, Gwynedd, Wales, UK | 53° 5' 36" N | 4° 10' 50" W | 10.9km (6.8 miles) | |
| Shadow Gully, Beddgelert, Gwynedd, Wales, UK | 53° 3' 36" N | 4° 4' 49" W | 11.4km (7.1 miles) | |
| Unnamed quarry NNW of Llyn Cowlyd Dam, Dolgarrog, Conwy, Wales, UK | 53° 9' 21" N | 3° 53' 37" W | 11.4km (7.1 miles) | |
| Tyddynbach Mine, Betws Garmon, Gwynedd, Wales, UK | 53° 5' 13" N | 4° 11' 5" W | 11.6km (7.2 miles) | |
| Lliwedd Mine, Beddgelert, Gwynedd, Wales, UK | 53° 3' 29" N | 4° 2' 29" W | 11.7km (7.2 miles) | |
| Gallt y Wenallt outcrops, Beddgelert, Gwynedd, Wales, UK | 53° 3' 33" N | 4° 1' 35" W | 11.7km (7.3 miles) | |
| Carnedd y Cribau, Beddgelert, Gwynedd, Wales, UK | 53° 3' 51" N | 3° 58' 39" W | 12.3km (7.7 miles) | |
| Hafod y Llan workings, Beddgelert, Gwynedd, Wales, UK | 53° 2' 56" N | 4° 3' 15" W | 12.6km (7.8 miles) | |
Penrhyn Slate Quarry, Llandygai, Gwynedd, Wales, UK