The sand and gravel resources of the country around Mold, Clwyd : description of 1:25,000 sheet SJ 26 and part of SJ 16

The geological maps of the Institute of Geological
Sciences, pre-existing borehole information, and 73
boreholes drilled for the Industrial Minerals Assessment
Unit form the basis of the assessment of the sand and
gravel resources of the country around Mold, Clwyd.
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 where appropriate.
The mineral bearing ground is divided amongst five
resource blocks, containing between 2.2 and 14.2 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.