The geological maps of the Institute of Geological
Sciences, pre-existing borehole information, and 57
boreholes drilled for the Industrial Minerals Assessment
Unit form the basis of the assessment of the sand and
gravel resources of the Potter Hanworth and Reepham
area of Lincolnshire.
All deposits of 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 1:25 000 map is divided into four resource blocks, containing between 7.6 and 19.9 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
