The sand and gravel resources of the country south of Wrexham, Clwyd : description of 1:25,000 resource sheet SJ 34 and parts of SJ 24

The geological maps of the Institute of Geological Sciences, pre-existing borehole information, and 70 boreholes drilled for the Industrial Minerals Assessment Unit form the basis of the assessment of the sand and gravel resources of the area south of Wrexham, Clwyd. 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 four resource blocks, containing between 9.4 and 18.4 km2 of sand and gravel. For each block 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 also given. The geology, the position of the boreholes and the outlines of the resource blocks are shown on the accompanying resource map.