Assessment of the Mineral Resources of the Arabian Shield, Cover Rocks, and Lava Flow, KSA
Rushdi R. Al Dawawsi, Adeeb H. Al-Ziyadi, Ali M. Babhair, and Majed M. Al-Qurashi
Seven trenches had been dug through the graphite occurrences at wadi Irkhayman, XRD demonstrates graphite-carbon percent is between 8.7 percent and 29.9 percent, no beneficiation tests has been made in this stage. Milky-white quartz veins in Bishah area at Jabal Arfajan, Jabal As Sayira Al Bayda and Jibal lumaiz Rak are forming together a promising reserves, chemical analysis for surface samples showed SiO2 content is ranging between 99 percent and 99.7 percent, and Fe2O3 content is between 0.07 percent and 0.22 percent.other quartz veins at Jabal Hitman Jabal al Marwatain and Wadi Yaibah are also of importance. A total of 38 surface samples of nepheline syenite had been collected from Jabal Ad Dur as Saghir north of An Nimas for chemical, mineralogical study and beneficiation tests. Chemical analysis results showed very high iron oxide content (commercial deposits contains <2 percent Fe2O3 ) ranging between 2.86 percent and 5.80 percent, mineralogical study investigation indicates nepheline syenite to nepheline bearing syenite. The magnetic separation after 3 runs on selected samples showed Fe2O3 contents ranging between 0.31 percent and 0.48 percent that make it is unfavourable high quality products. White to grayish-white limestone outcrops that situated, in particular at wadi As Sahba east and east of Al Kharj are of considerable extension and high chemical purity. Color Index measurements indicates promising whiteness which ranging between 89.80 percent and 91.93 percent. The limestone situated northwest of Ar Riyad is characterized by very high chemical purity (CaO contents vary between 51.2 percent and 55.6 percent), and whiteness percent is between 88.13 percent and 93.63 percent. This limestone may considered as a good source of carbonate filler for the Saudi local market. Granitic hills of attractive colors and minable surfaces are available at the vicinity of Tathlith. Marble outcrops that situated south east of Tathlith, Al Majaridah area, and east of Al Qunfuthah are of varied chemical composition graded from limestone to dolomite. This limestone/marble could be considered as a important source for cement raw material. Kaolinitic clay at Khushaym Radi is mainly gray in colore and locally with high Fe2O3 content, due to the ferruginous sandstone intercalations. The clay southeast of Al Qawz and the silt south of As Subaykhah contain high Fe2O3 content, and need more geologic investigation. Slate /schist at Jazaat Ath Thalooth is characterized by variegated color and could be used in industry after investigation also, these rocks has attractive colors and could used as tiles. Black sand is situated along southeast of Al Lith which could be an interesting source for ilmenite and magnetite.
Al Dawawsi R.R., Al-Ziyadi A.H., Babhair, A.M., and Al-Qurashi, M.M., 2011, Assessment of the mineral resources of the Arabian Shield, Cover Rocks, and Lava flow, KSA: Saudi Geological Survey Open-File Report SGS-OF-2011-2, 28 p., 14 figs., 22 tables.