Abstract
Large variations in quality of excavated limestone, mainly the content of CaCO 3, originate from different mineral compositions at 20 excavator points in 2 big quarries, and they are controlled within desired limits by regulating the time sequence of unloading trucks of different material into the 5 crushers distributed about the quarries. A Ferranti ARGUS 100 computer, connected on-line to all important parts of this plant of 3 km diameter, has not failed in two years of continuous operation, and it monitors the material unloadings and precalculates the mix quality at the final confluence point of a comprehensive conveyor belt system from the crushers. Then the computer checks which possible unloadings may bring the future total quality out of its limits. Next it temporarily stops, by means of traffic lights, those trucks with loads which would disturb the quality. Besides this quality control, the computer monitors the operation of 180 parts of the plant, and it gives information to several outstations in the plant on the accumulated ton production of excavators, trucks, crushers, belts, and quarries since commencement of a shift and also on qualities at the different parts of the quarries.
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