Largest Slate Quarry In The World

Penrhyn quarryhe penrhyn quarry is a slate quarry located near bethesda in north wales the end of the nineteenth century it was the worlds largest slate quarry the main pit is nearly 1 mile 1km long and 1,200 feet 370 metres deep, and it was worked by nearly 3,000 quarryment has since been superseded in size by slate quarries in china, spain and the usa.

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