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