The sand and gravel resources of the country north-east of Thaxted, Essex : description of 1:25,000 sheet TL 63

The geological maps of the Institute of Geological
Sciences, pre-existing borehole information, and 93 boreholes
drilled for the Industrial Minerals Assessment Unit
form the basis of the assessment of the sand and gravel
resources of the country north-east of Thaxted, Essex.
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 four resource blocks,
containing between 0.9 and 9.6 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.