MineArchiveHanson
The building-materials group that ran Tonfanau Quarry in its final years, closing it in 1998 and removing most of the plant and machinery. Nothing is recorded of the quarry's earlier corporate ownership.
Mines operated
| Mine | Region | Years |
|---|---|---|
| Allington Quarry | Kent | ?–2001 |
| Monks Park Mine | Wiltshire | ?–2017 |
| Penmaenmawr Granite Quarry | Conwy | 1989–2023 |
| Ribblehead Quarry | North Yorkshire | ?–2000 |
| Tonfanau Quarry | Gwynedd | ?–1998 |
| Tytherington Quarry | South Gloucestershire | 1988–2023 |
Record created: 3 September 2026 · Last researched: 3 September 2026