The sand and gravel resources of the country south of Horncastle, Lincolnshire : description of 1:25,000 resource sheet TF 26

The geological maps of the Institute of Geological
Sciences, pre-existing borehole information, and 48
boreholes drilled for the Industrial Minerals Assessment
Unit form the basis of the assessment of the sand and
gravel resources of the country south of Horncastle,
Lincolnshire.
All the deposits in the resource sheet area 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 1:25 000 map is divided into three resource
blocks containing between 8.2 and 17.0 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
gradings 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 map.