Stock Photo - A quarryman drilling into the rock at Penyrorsedd Slate Quarry, Nantlle Valley, Caernarvonshire (now Gwynedd), North Wales. The silica dust in the air is lethal, giving rise to silicosis, an incurable respiratory disease affecting most slate quarry workers in middle age.

Stock Photo: A quarryman drilling into the rock at Penyrorsedd Slate Quarry, Nantlle Valley, Caernarvonshire (now Gwynedd), North Wales.

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