The sand and gravel resources of the country around Nayland, Suffolk : description of 1:25,000 resource sheet TL 93

The geological maps of the Institute of Geological
Sciences, pre-existing borehole information, and 111
boreholes drilled for the Industrial Minerals Assessment
Unit form the basis of the assessment of the sand and
gravel resources of the country around Nayland, Suffolk.
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 1:25 000 map is divided into 8 resource blocks,
containing between 3.2 and and 14.5 km' 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.