Pennant / Penrhyn Estate

Richard Pennant inherited the Penrhyn Estate in 1781 and consolidated its scattered workings into the vast Penrhyn Quarry, investing in roads, a railway and Port Penrhyn to build it into the world's largest slate quarry; the Pennant family's ownership, and its harsh labour relations, culminated in the three-year Penrhyn Lockout of 1900-1903, Britain's longest labour dispute.

Mines operated

Record created: 20 August 2026