Small Aggregates Crushing Machine

Once the rock has been safely blasted, there remains a 25,000 – 30,000 tonne pile of rock which should be tall and narrow and therefore easy to pick up by the giant excavator. We have just invested over 1.6 million in a new 280 tonne excavator which has been named Thor by a local school pupil . The blast is also designed to ensure the rock fragments produced are small enough to pass through the primary crusher. For rocks which are too large, the excavator uses a giant six tonne manganese steel ball which it drops down to break them up. The two giant excavators we have on site each have a 20 tonne capacity bucket which load up 100-tonne capacity dumptrucks which drive up to the primary crusher where the rock goes through the first of several processing stages.

Screening rocks to collect different-sized aggregates

The crushed rock is then passed through 12 giant vibratory screens in the Screen House. These screens separate out nine different sizes of rock – suitable for many applications from the largest, about the size of a tennis ball, for rail ballast to the smallest as dust for paths and bridleways. The various sizes are collected into separate bins and conveyed to the next stage through a tunnel under Wood Lane. The storage building or ‘Toast rack’ holds batches of around 3,000 tonnes of single-sized product in covered bays. Below these bays four conveyors are controlled by a computerised central control system to blend the aggregates as they are required and feed material through to one of the final product processing areas.

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