

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.
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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