SCALE IN  FEET so ao zoo ago I I I 1 districts—lead in Somerset, Shropshire, Flintshire and Derby-shire; iron in the west Sussex Weald, the Forest of Dean, and (to a slight extent) elsewhere . Other minerals were less potable . The gold mentioned by Tacitus proved scanty . The Cornish tin, according to present evidence, was worked comparatively little, and perhaps most in the later Empire . Lastly, the roads .