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Understanding Quarrying: An Animated Guide

Understanding Quarrying: An Animated Guide
14/05/2018

Did you know that every year the UK quarries over 300,000,000 tonnes of aggregates? Or that there are 1300 quarries operational around the UK today? You rely on quarries more than you know, with aggregates providing the foundation for houses, roads, shops and farms.

We’ve produced this animated video to introduce you to quarrying and help you to learn a little bit more about how it works. We’ve also put together a more detailed FAQ which can be found underneath the video and will answer your most burning questions.

What is Quarrying?

Quarrying is the process of extracting minerals such as rocks, sand and gravel from the earth. A quarry is the place where this happens and normally looks like a deep pit. The main difference between a quarry and a mine is that a mine is underground, whilst a quarry lacks a roof; in the UK this is a legal definition but around the world the two terms are used more loosely.

Quarried construction materials like rocks, sand and gravel are called ‘aggregates’ (recognise the name?!) Dimension stones are also excavated; these are much larger and very precisely cut and finished for a particular effect. The main stone types extracted for this purpose are granite, limestone, slate, marble and sandstone.

What are aggregates used for?

The biggest use for aggregates is in construction and they are used in a huge variety of applications, including:

• Asphalt – used for roads, pavements, runways, playgrounds etc. • Ready mixed cement – created from limestone and shale • Drainage structures • Noise barriers • Buildings – used in foundations • Driveways and gardens • Railway ballasts • Reservoirs and sewage treatment works • Equestrian arenas • Concrete – a mixture of aggregates, cement and water • Agriculture • Glass – created from sand

In total, aggregates make up around 85% of all non-energy minerals extracted in the UK and are used widely in construction and industry.

Dimension stones are also used in construction and are often used to construct prestigious and beautiful buildings such as monuments and official buildings. They’re also used to create kitchen counter tops, gravestones, and tiles for roofs and paths.

The Quarrying Process Large rock drill rigs are used to drill several holes into the rockface.

• These holes are then filled with explosives which are detonated to break up the rock.

• Over the years, this process has become very precise, with blasts carefully timed and delivered to fragment the maximum amount of rock with the least number of blasts in order to minimise environmental impact. Blasts need to be delivered at the right time, place and in the correct quantities.

• Quarries are subject to strict safety protocols. Before blasting, the area must be properly barricaded and people kept a safe distance from the blast. Quarries must also make efforts to minimise environmental impacts such as ground vibration, airblast and fumes; this can be achieved through proper blast design.

Loading and Excavating

• Once the all-clear has been given, front end loaders and excavators can collect the blasted material and move it to haul trucks.

Hauling

• As quarries are often in isolated areas, special haul roads often need to be built.

• Rigid frame and articulated lorries transport the quarried material from the quarry to the primary crusher or processing plant.

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