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Reconnaissance wadi-sediment geochemical survey of the Bi'r Jarbuah area, Kingdom of Saudi Arabia

Open-File Report 90-286

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Abstract

A reconnaissance wadi-sediment geochemical survey for gold was conducted in the Bi'r Jarbuah Area (lat 20° 45' 00"-21 ° 00' 00" N., long 43° 30' 00"- 43° 41' 00" K). The area is located in the northern part of a regional concentration of gold occurrences, the Jabal Ishmas-Wadi Tathlith gold belt. Panned concentrates and minus-80-mesh fractions were obtained from 300 samples collected from a 320 km2 area and analysed by atomic-absorption spectroscopy. Analyses of the pannedconcentrate samples proved to be more definitive than sieved samples in delineating areas of mineralization. Most of the anomalous gold-and arsenic-bearing wadi-sediment samples are located along an irregular contact between gneissic and dioritic rocks in the center of an area characterized by the presence of subparallel dacitic dike swarms.

Most of the ancient gold mines are also located along this contact. Gold is associated with arsenic but not with silver. Five areas containing gold-anomalies areas and 6 areas containing tellurium anomalies and the contact zone between the diorite and the paragneiss are recommended for further investigation of precious-metals resources.

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Additional publication details

Publication type:
Report
Publication Subtype:
USGS Numbered Series
Title:
Reconnaissance wadi-sediment geochemical survey of the Bi'r Jarbuah area, Kingdom of Saudi Arabia
Series title:
Open-File Report
Series number:
90-286
Year Published:
1990
Language:
English
Publisher:
U.S. Geological Survey
Publisher location:
Reston, VA
Description:
iii, 32 p. : ill. ; 28 cm.
Country:
Saudi Arabia
Online Only (Y/N):
N
Additional Online Files (Y/N):
N