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Oakeley Company

The Oakeley Slate Quarries Company was created in 1883 by amalgamating the Upper (Holland's) and Middle quarries at Blaenau Ffestiniog, later adding Cwmorthin and Nyth y Gigfran to become the third-largest producer in the Welsh slate industry, employing around 1,700 men across the largest underground slate mine in the world.

Mines operated

MineRegionYears
Cwmorthin Slate Mine Gwynedd 1900–1970
Votty and Bowydd Quarry Gwynedd 1933–1963

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