Zambia Exports of bitumen and asphalt (natural), bituminous or oil shale, tar sands to South Africa was US$7 during 2018, according to the United Nations COMTRADE database on international trade. Zambia Exports of bitumen and asphalt (natural), bituminous or oil shale, tar sands to South Africa - data, historical chart and statistics - was last updated on May of 2024.