The sand and gravel resources of the country around Wem, Shropshire : description of 1:25,000 resource sheet SJ 42 and SJ 52

The assessment of the sand and gravel resources in the
Wem area, Shropshire, is based on the geological maps
and borehole records of the Institute of Geological
Sciences, records made available by the sand and
gravel industry, recent field work and one hundred and
eighty-two boreholes drilled for the Industrial Minerals
Assessment Unit.
All deposits in the area which might be potentially
workable for sand and gravel have been investigated
geologically 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 confidence level.
The area has been divided into six resource blocks
each containing between 9.6 and 19.2 km2 of sand and
gravel. For these blocks the geology of the deposits is
described and the mineral-bearing area, the mean
thickness of overburden and mineral and the mean
grading of the mineral are stated. Detailed borehole
data are given. The geology, the position of the
boreholes and the outlines of the resource blocks are
shown on the accompanying map.