South Africa exports of Pebbles, gravel, broken or crushed stone; of a kind commonly used for concrete aggregates, for road metalling or for railway or other ballast, shingle and flint, whether or not heattreated was and quantity 4,613,710Kg. South Africa exported Pebbles, gravel, broken or crushed stone; of a kind commonly used for concrete aggregates, for road metalling or for ...