Although the western central Damara Belt hosts Namibia's best-known deposits (e.g. Rossing, Langer Heinrich, Valencia), uranium has also been found in the north (Engo Valley) and in the south (Namaqua Belt). Airborne radiometric surveys conducted by the Geological Survey in the 1970s located a number of new occurrences, classified as intrusive-hosted, pedogenic, or sedimentary.