. Quarries McQuillan Companies McQuillan Quarries have been associated with high quality materials and service for generations. This tradition has ensured that we are now leading suppliers of blacktop products, high PSV aggregate and sub base materials throughout GB and Ireland today. Granite Quarry Red Granite Aggregate Europe's Premier Cloburn Quarry produces a wide range of landscaping materials suitable for commercial use. Our range includes, decorative red aggregates, bedding sand, SUDS aggregates, crusher runs and sub-bases. We also have a subsidiary ready-mix company Granitmix™ which supplies premium concrete. All of which is produced using the same high quality granite. 