The sand and gravel resources of the country west of Stirling, Central Region : description of 1:25,000 sheet NS 69, 79

The geological maps of the Institute of Geological
Sciences, sixty-two boreholes and sixteen shallow
pits sunk for the Industrial Minerals Assessment
Unit, together with data from thirty-two other
boreholes and the inspection of sand and gravel
workings, form the basis of the assessment of sand
and gravel resources in the area west of Stirling,
Central Region.
All deposits in the area which might be
potentially workable for sand and gravel have been
investigated. The 1:25000 map is divided into
three resource blocks, for one of which a simple
statistical method is used to estimate the volume
of potentially workable sand and gravel over an
area of 12 .4km2. The reliability of this volume
estimate is given at the symmetrical 95 per cent
probability level. For the two other resource
blocks inferred assessments are offered for 2.7
and 2.9km2, respectively, of mineral.
The geology of the deposits is described and
the mineral-bearing area, the mean thickness of
overburden and mineral, and the mean grading are
stated. Detailed borehole data are given. The
geology, the outlines of the resource blocks and
the position of boreholes and shallow pits used in
the assessment are shown on the accompanying map