The sand and gravel resources of the country around Biggar, Strathclyde region : description of 1:25,000 sheets NS 93 and NT 03, and parts of NS 92 and NT 02

The geological maps of the Institute of Geological Sciences, thirty-eight boreholes and forty-four shallow pits sunk for the Industrial Minerals Assessment Unit, together with pre-existing borehole information, form the basis of the assessment of sand and gravel resources in the Biggar area which straddles the boundary between Strathclyde and Borders regions. Most deposits in the area that may 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 1:25 000 map is divided into four resource blocks containing between 4.5 and 7.3 km2 of potentially workable sand and gravel. 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 sample point data are given. The geology and the outlines of the resource blocks, the position of boreholes and shallow pits used in the assessment are shown on the accompanying resource map.