The sand and gravel resources of the country around Catterick, North Yorkshire : description of 1:25,000 sheet SE 29

The geologica1 maps of the Institute of Geological
Sciences, pre-existing borehole information, and 53
boreholes drilled for the Industrial Minerals Assessment
Unit form the basis of the assessment of the sand and
gravel resources of the country around Catterick, North
Yorkshire.
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 mineral-bearing ground is divided into four
resource blocks, containing between 11.2 and 15.1 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 of the mineral 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.