The columns are made of single pieces of granite (the quarries were owned by the duke).

Today the quarry is owned by Leiths Group and employs 12 people.

The quarry is owned by the Haida who have the sole right to use the substance from that quarry for carving.

The quarry is now owned by a local family.

The quarry is privately owned and was added to the National Historic Register in 1978.

Since 1963, the quarry has been owned by the de Beijer family.

Both quarries are owned by the Duchy of Cornwall.

The quarry is run and owned by Lafarge Aggregates.

Both quarries are owned by The Crown Estate and have been leased since 1982.

The quarry was originally owned by Brittain Bricks.