Since 1947 the area has been a major source of construction sand, brick shale and plastic clay, the latter two commodities being produced from fluvio-lacustrine sediments of Tertiary age within the Golden Grove Embayment, on the eastern flank of the...

ICI has been undertaking a limited dewatering programme at its Penrice Quarry since mid-1978 to allow quarrying of the 4th level (EL 327 m). Monitoring carried out for the programme has included recording of the groundwater levels in wells drilled...