Slovakia Exports of pebbles, gravel, flint, macadam of slag, tarred macadam to Belgium was US$1.51 Thousand during 2018, according to the United Nations COMTRADE database on international trade. Slovakia Exports of pebbles, gravel, flint, macadam of slag, tarred macadam to Belgium - data, historical chart and statistics - was last updated on May of 2024.