The Regional Technical Statement 2 (RTS2) identifies an apportionment figure of 0.058 million tonnes of sand and gravel and 27.556 million tonnes of crushed rock.
Mae Datganiad Technegol Rhanbarthol 2 yn nodi ffigur dosrannu o 0.058 miliwn o dunelli o dywod a graean a 27.556 miliwn o dunelli o gerrig mâl.