Botswana Exports of pebbles, gravel, flint, macadam of slag, tarred macadam to Zambia was US$12.73 Thousand during 2020, according to the United Nations COMTRADE database on international trade. Botswana Exports of pebbles, gravel, flint, macadam of slag, tarred macadam to Zambia - data, historical chart and statistics - was last updated on May of 2024.