The original road through the Nant Ffrancon was constructed by Lord Penrhyn in the late 18th century, and at Capel Curig in 1801 he built a coaching inn, which is now Plas y Brenin, the UK National Mountaineering Centre.
In 1765 Anne Susanna married the other heir to the Penrhyn estate, Richard Pennant, who later became the 1st Baron Penrhyn.
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The quarry was first developed in the 1770s by Richard Pennant, later Baron Penrhyn although it is likely that small-scale slate extraction on the site began considerably earlier.