The sand and gravel resources of the country around Wem, Shropshire : description of 1:25,000 resource sheet SJ 42 and SJ 52

The assessment of the sand and gravel resources in the Wem area, Shropshire, is based on the geological maps and borehole records of the Institute of Geological Sciences, records made available by the sand and gravel industry, recent field work and one hundred and eighty-two boreholes drilled for the Industrial Minerals Assessment Unit. All deposits in the area which might be potentially workable for sand and gravel have been investigated geologically 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 confidence level. The area has been divided into six resource blocks each containing between 9.6 and 19.2 km2 of sand and gravel. For these blocks the geology of the deposits is described and the mineral-bearing area, the mean thickness of overburden and mineral and the mean grading of the mineral are stated. Detailed borehole data are given. The geology, the position of the boreholes and the outlines of the resource blocks are shown on the accompanying map.