[en] Reconnaissance geochemical radiometric survey of stream sediments resulting from the weathering of outcropped rocks in and around the study area was performed. This survey included heavy mineral sampling, trace and radioelements and radon measurements to evaluate the radioactivity of the source rocks and to understand the nature and distribution of the heavy minerals and trace elements in the study area. Several techniques were used to achieve these objectives. The results of heavy mineral geochemical survey show that the abundant minerals are iron oxides (magnetite, hematite, goehtile and limonite) pyroxene and olivine; less abundant minerals are apatite, ilmenite, garnet, barite, siderite and gloconite, while rare minerals are zircon and rutile. Amphibole is reported as an abundant mineral in sand dunes and is less abundant in samples located in the northern part of the study area. The amphibole seems to be derived from the ophiolitic complex north of the study area. Grain size analysis of heavy minerals revealed that the concentration of economic minerals such as zircon rutile and ilmenite increases with the decrease of the grain size. The microscopic study showed fragments and fossils of foraminifere mostly impregnated with heavy metals such as iron and manganese resulting from diagenetic metasomatism and replacement processes of. Fish teeth (< 2 mm) and oolite of iron were also noticed in most of the samples. The morphology of heavy mineral grains shows that most of the grains are angular to subangular suggesting that they were transported for short distance from their source rocks. Normally, phosphate pellets, gloconite and iron ooids are not considered since their original morphological features show clear roundness that attributed to their sedimentological origin, not to transportation factor. The source rock of most of the heavy mineral assemblage is the basalt. Apatite and gloconite are derived from the phosphorite and phosphatized limestone encountered in the study area. While iron, ooids are derived from sedimentary iron mineralization located east of the study area. Radon measurement results outlined several high values in different locations of the study area particularly northwest and south associated with fault zone. Elsewhere, radon concentrations are falling within the background level. A GIS software IL WIS2.2 was used to produce geochemical and radiometric maps of the study area to help in delineating the anomalous areas and to interpret their occurrence in relation to geology, drainage and tectonic layers. These maps show that the relatively high values of uranium are related to phosphatic rocks encountered in and around the study area. Trace elements showed no slight variations reflecting little changes in the lithology and structure of the study area. Several locations of high concentration of few elements were pinpointed. The significance of drainage geochemistry (Stream sediments and heavy minerals) and GIS combination for radioactive minerals exploration to establish geochemical database was evident. (Author)