The sand and gravel resources of the country around Coggeshall, Essex : description of 1:25,000 resource sheet TL 82

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 in the country around
Coggeshall, Essex.
All 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 their volume.
The accompanying 1:25 000 map is divided into five
resource blocks or sub-blocks containing between 4.6
and 35.3 km2 of potentially workable sand and gravel.
The geology of the deposits is described and the
mineral-bearing areas within each block are
distinguished. The mean thicknesses of overburden
and mineral and the mean gradings, together with
detailed borehole data, are also given. The geological
lines and symbols, the positions of all IMAU
boreholes (including grading information where
available) and most other non-confidential boreholes
used in the assessment and the outlines of the
resource blocks are shown on the accompanying
resource map.