The sand and gravel resources of the country around Callander and Dunblane, Central Region : description of 1:25,000 resource sheet NN 60 and 70

The geological maps of the Institute of Geological
Sciences, fifty-one boreholes and twenty-three shallow
pits sunk fort he Industrial Minerals Assessment Unit,
together with data from twelve other boreholes and the
inspection of sand and gravel workings, form the basis
of the assessment of sand and gravel resources in the
area around Callander and Dunblane, Central Region.
All deposits in the area which might be potentially
workable for sand and gravel have been investigated
and a simple statistical method 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, which contain between 2.6 and 9.6 km2 of
potentially workable sand and gravel as distinct fromm
potentially workable morainic drift. 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 various types of deposit are stated.
Detailed borehole and section data are given. The
geology and the outlines of the resource blocks, the
position of the boreholes, shallow pits and sections
used in the assessment are shown on the accompanying
map.