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Concession Coordinates
OPAL MINING .CO. LTD SIGNED CONECESSION AGREEMENT FOR THE EXPLORATION DEVELOPMENT AND EXPLOITSTION OF GOLD AND ASSOCIATION METALS .
BLOCK : NS-R2
NORTHERN STATE
(WADI HALFA)
The area surveyed is known as Sahara desert . It covers an area of about 300. sq.km.
The area bounded by Latitude 21° 20' 25" and 21° 12' 37"; Longitude 31° 42' 0.00" and 31°30' 0.00" (Fig.1). The area is accessible from Khartoum to Abu Hamad through National Highway; from Abu Hamad along the railway to Wadi Halfa, from railway station No. 6 to the concession area unpaved road, (only 4X4 cars). The distance from Khartoum to Abu Hamad is 470 km and from Abu Hamad to railway station No6. 165 km and to the Concesion area is about 55 km. the total distance is about 690 km.
Physiography and Climate
The concession area domain situated in the western margin of the Nubian Desert, whereby, more than 50% of the surface area covered by sand dunes.
The thickness of the sandy sheets varies from place to place, but in most localities reaches few meters above the surrounding. Most of the ridges and basement inselbergs are scattered in this area. Low-lying basement outcrops are exposed as peneplains,
The topography of the south of Block covered by low-lying Nubian Sandstones. The concession is part of the Sahara Desert and thus the prevailing climate is dry with less than 50mm per year rainfall in the period from July to September. The winter season is from November to February in which the daily temperature may drop to 15oC. Otherwise, the climate is very dry and hot, the daily mean temperature ranges from 35oC To 42 oC
TECTONIC SETTING AND REGIONAL GEOLOGY
The Precambrian geology in NE Africa comprises two distinct crustal domains;
The Nile Craton and the Arabian-Nubian Shield (Stern, 1994; Kröner, et al. 1987a; Vail, 1983; 1988; Rocci, 1965). Geology of Wadi Halfa-Bayuda-Gabgaba area
The area covered by Bayuda Desert is relatively well studied compare to other areas in northern Sudan (Vail, 1971; Barth and Meinhold, 1979; Dawoud, 1980; Ries, et al, 1985). Wadi Halfa and Bayuda Terrains (Schandelmeier, et al, 1994) represent the reworked eastern foreland of the Nile Craton, while Gabgaba Terrain (Abdelrahman, 1993) represented the western most par of the Arabian-Nubian Shield (ANS). Wadi Halfa area poorly understood due to the limited studies conducted in the area (Stern, et al, 1994; Griffiths, et al, 1987).
According to the previous studies in the north and northeast Sudan, the litho-stragtigraphic units of the Wadi Halfa-Bayuda-Gabgaba area are (Denkler, et al, 1994; Abdelrahman, 1993; Vail, 1988; Barth and Meinhold, 1979):
1. Phanerozoic sediments (youngest).
2. Magmatic rocks.
3. Molasse – type sediments.
4. Volcano-sedimentary sequences.
5. Ophiolitic mélange rocks.
6. Low-grade metasediments.
7. High- grade supra-crustal metasediments.
8.High-grade gneisses (oldest).
