The sand and gravel resources of the country around Tholthorpe, North Yorkshire : description of 1:25,000 resource sheet SE 46

The geological maps of the Institute of Geological Sciences, pre-existing borehole information and 90 boreholes drilled for the Industrial Minerals Assessment Unit, form the basis of the assessment of sand and gravel resources of the country around Tholthorpe, North Yorkshire. All deposits which 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 1 :25 000 map is divided into five resource blocks; for each block the mineral-bearing area, the mean grading and the estimated volume of mineral are stated. For three of the blocks, where the available data are sufficient, the mean thicknesses of mineral and overburden, together with statistical assessments of the volume of mineral, are given also; for the two remaining blocks inferred assessments of the volume are made. Detailed borehole data are presented in Appendix E. The geology, the position of the boreholes, and the boundaries of the resource blocks are shown on the accompanying map.