Oakeley Quarry
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| Opened | 1818 |
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| Closed | March 2010 |
| Date of Reg. | |
| Date of Upd. | |
| ID | 3026846 |
About Oakeley Quarry
Oakeley quarry is a slate quarry in the town of Blaenau Ffestiniog, north Wales. It was the largest underground slate mine in the world, and had 26 floors spanning a vertical height of nearly 1,500 feet.