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Quarrying, More than 23,000 work in the quarrying industry in some capacity Most work in rural areas

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Introduction

Quarrying More than 23,000 work in the quarrying industry in some capacity Most work in rural areas Current UK aggregate outputs of crushed rock, sand and gravel is 320 million tonnes, the majority of which is used in the construction industry The market for aggregates is enormous; Quarrying is essential to the maintenance and growth of our society. The aggregates are used in building houses, schools, hospitals and shops. Roads, railways and airports. Also sewerage systems, sea defences, agricultural and leisure facilities. Aggregates are obtained from two main sources. In the first instance, rock is blasted from the quarry face and screened to yield stockpiles of 'sized' aggregates. Three basic types of rock are used to produce most crushed rock aggregates - igneous, sedimentary and metamorphic. The cliffe hill quarry uses an intermediate intrusive igneous rock called 'Granodiorite'. ...read more.

Middle

The waves, together with the force of the expanding gases, raise the medium into a cupola. Material is then forced outwards producing a pattern of cracking and shattering of the rock. The rock produced by the blast is then transported by truck and or conveyor to a crusher, and there begins the process of size reduction. The rock is moved through various stages of crushing and screening into a range of final sizes of aggregate. It may sometimes be washed before being carefully stored in segregated piles according to it's size or even colour. The quarry can become very deep over a period of years with steps or benches of many meters. Some of the aggregates are mixed on site with bitumen or cement to make asphalt or ready-mix concrete. This reduces the loading and transportation operations. ...read more.

Conclusion

Dust Cliffe hill quarry has wheel-cleaning facilities to ensure that mud and dust are not carried outside the quarry area. Within the quarry itself, areas particularly prone to dust are sprayed with water and the stone itself is sprayed as it enters the crusher. When the aggregates are heated and dried to make asphalt, dust is eliminated by fan extraction and the dirty air is then put through filters before being discharged. Pics - a dust extractor in operation, loads being sheeted and wheels cleaned before transport leaves the quarry Re-instatement and aftercare Rock quarries are difficult to restore because of their depth Conclusion Our life-style demands high quality building products and this means that quarries must work effectively and efficiently and economically while remaining environmentally aware. There are many ways to restore a quarry - to lakes, for boating, fishing or nature conservation, as parks or woodland, for public enjoyment as well as for commerce and buildings such as houses, factories and shops. ...read more.

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