Detailed Study on Dawmat al Jandal Silica Sand, Al Jawf Region, Kingdom oF Saudi Arabia

SGS-TR-2011-8 Rafat A. Ghandoura, Zaid A. Al-Nakhebi, Omar M. Tayeb, Mazen A. Al-Tamimi, and Ghassan Al-Sulimani
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ABSTRACT


The Al-Mulayh silica sand deposit is located about 44 km to the south of Dawmat Al Jandal town.  The investigated sandstone is assigned to the Sirhan Formation and is exposed along the Hail - Dawmat Al Jandal expressway.  The study area is represented by discontinuous and dispraised hills situated within a flat area.  The hills are elevated up to 10m from the wadi level, and consist principally of white, poorly cemented sandstone and are mantled by sand dunes.  Geologically, the Al-Mulayh silica sand is related to the Aruma Group of Sirhan Formation of Tertiary age. The deposit predominantly consists of well-sorted white silica sand covering an area of about 200 km2. The average thickness of sandstone is 18 m.  The Al-Mulayh deposit has been divided into two zones. Zone A is exposed to the west of the Hail-Dawmat Al Jandal Qurayat highway (N 29° 28’ 54.6” and E 39° 53’ 48.4”). Zone B lies to the east of the Qurayat highway (N 29° 27’ 27.2” and E 39° 59’ 40.1”).  Analysis of the surface samples from the Al-Mulayh silica sand show an average silica (SiO2) content of 97 percent, iron oxide 0.2 percent and alumina 1.4 percent. A total number of 27 drill holes were executed during the drilling program, covering an area of about 20 km2 in both zones within the Al Muleyh sand deposit. Core sample analysis shows average silica (SiO2) content of 97 percent, iron oxide 0.1 percent and alumina (Al2O3) 0.6 percent. Silica sand resources that were estimated on the basis of drill core data and surface outcrops are about 80 million tons. Particle size analysis shows an acceptable size range for various industrial uses. Due to its high silica content, Al Muleyh silica sand is suitable for glass applications. The high whiteness ratio of the investigated silica sand from the study area could make an appreciable contribution to the filler industry.

 

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Ghandoura, R.A., Al-Nakhebi, Z.A., Tayeb, O.M., Al-Tamimi, M.A., and Al-Sulimani, G., 2011, Detailed study on Dawmat Al Jandal silica sand, Al Jawf region, Kingdom of Saudi Arabia: Saudi Geological Survey Technical Report SGS-TR-2011-8, 20 p., 15 figs., 12 tables.