Systematic geochemical soil and stream sediment sampling by the Geological Survey of Namibia (GSN) commenced in 1999. The Regional Geochemical Sampling Programme follows the Final Report of the IGCP (International Geological Correlation Programme) Project 259. Its aim is to establish a National Baseline Geochemical Database of elements in the anthropogenically undisturbed geosphere. Baseline geochemical surveys have applications in mineral exploration, land use planning, agriculture, medical geology, and many other fields. 2850 stream sediment and soil samples, including 159 duplicates, were collected at pre-selected locations in the area covered by 250 k map sheet 2116 Okahandja. Preliminary geochemical data were obtained by analysing the fine fraction (<180 μm) by portable XRF (Niton Energy Dispersive XRF) at the GSN laboratory to assess the effectiveness of this method in regional surveys. Spatial distribution maps for Cu and Fe in soil and stream sediments were compiled with ESRI ArcGIS software, and interpreted in terms of underlying country rock and morphology. Keywords: Geochemical mapping, baseline study, copper, iron.