The sand and gravel resources of the country around Chichester and north of Bognor Regis, Sussex : description of 1:25,000 sheet SU 80 and 90

The geological maps of the Institute of Geological Sciences, pre-existing borehole information and 138 boreholes drilled for the Industrial Minerals Assessment Unit (IMAU) form the basis for the assessment of the sand and gravel resources of the country around Chichester and north of Bognor Regis, Sussex. All the deposits in the district that might be potentially workable for sand and gravel have been investigated and a simple statistical method has been used to estimate the volume. The reliability of the volume estimates is given at the symmetrical 95 per cent probability level. The mineral bearing ground is divided into eight resource blocks, containing between 7.5 and 16.1 km2 of potentially workable sand and gravel. For each block the geology of the deposits is described, and the mineral bearing area, the mean thicknesses of overburden and mineral and the mean gradings of the mineral are stated; detailed borehole data are also given. The geology, the positions of the boreholes and the outlines of the resource blocks are shown on the accompanying resource map.