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Anomalous amounts of tungsten, molybdenum, and bismuth were found previously in surficial debris collected from the Uyaijah-Thaaban area in the west-central part of the Precambrian Al Uyaijah ring structure. The area is mostly underlain by quartz monzonite. Countless quartz vsins ranging from a knife edge to more than 3 m in thickness cut the qiartz monzonite; many of these veins contain molybdenite. Detailed mapping and intensive sampling of the molybdenite-bearing quartz veins indicate that their grade and quantity are probably inadequate to permit present-day mining; however, they represent a potential future resource. The tungsten of the area appears to be negligible. 32°S A(IR)-191 48' 16 16' 48°F igure 1.-Index map of western Saudi Arabia showing the location of the Al Areyef region, the Uyaijah ring structure, and the Uyaijah-Thaaban area. 1-211 identifies the area covered by the scale 1:500,000 geologic map of the southern Najd quadrangle (Jackson and others, 1962).

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