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 1500 ft.

History

The early quarries

The first slate quarry on the site of what was to become Oakeley, was begun in 1818 when Samuel Holland, a Liverpool merchant, leased land near Rhiwbryfdir

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