DescriptionThe famous Mahd adh Dhahab and other gold deposits in the Saudi Arabia are well documented in several publications, most recently in the comprehensive volume 'Geology of the Arabian Shield' (JOHNSON P.R. and KATTAN F.H., 2012). Exploration practices for such deposits mostly follow a certain pattern as long as the searched for deposits are not too deep expected and therefore would most likely have some surface indications, which can be traced by various exploration methods. These indications are frequently manifested in outcrops, geochemical anomalies and often also by diggings of small scale miners. Exploration by various airborne surveys like detailed LIDAR photography and magnetometry give large scale information. Groundwork includes mapping, systematic geochemical work, IP - grids, trenching etc. Once the anomalies have been defined in some details, drilling follows. The assay results are evaluated in computer simulation of the shape and volume of the deposit. The economical side of the exploration is then done in a feasibility study. Although the Archean-Lower Proterozoic of the Arabian shield in the West of the Arabian Peninsula has already yielded many Au- and base metal mineralization deposits, there is no doubt more potential for economical viable deposits. This is a part of our Brown Bag Lecture series. A light lunch will be provided.
Reinhard Paul Ramdohr
After matriculation in 1957 I worked one year as trainee in German mines. In 1963 I obtained the mining engineering degree at the Clausthal School of Mines. This was followed by two and a half years with Freudenberg Group in Germany, building water treatment plants, before joining Sentinel Mining Company in West Australia, searching for iron ore. 1968 Ph.D. in Geology at Heidelberg University in Germany. The following years I spent as base metal exploration geologist on various projects in South Australia before joining Aquitaine Australia Minerals as Project geologist in NT and WA. This work involved all levels of exploration for base metals, gold and uranium. I was instrumental in the discovery of the Sorby Hills lead deposit. Exploration in Germany and Kanada, USA and Sambia for Preussag AG from 1976 to 1978. From 1978 to 1990 I worked again with the Freudenberg Group for investment planning and control. During this period I was involved in industrial projects in Brazil, exploration projects in Senegal and Guinea. Since 1991 I am working as an independent consultant on various projects, e.g. from 1995 to 1998 for the German GTZ to promote small scale gold mining projects in Ghana. Later on RE targets in Ethiopia, fluorite in Mongolia etc. From 2001 to 2010 I did exploration work in Madagascar, including four years as U – exploration manager with Pan African Mining Corp. 2010 to 2013 Director for High River Gold Exploration Burkina SARL and Jilbey Burkina SARL in Burkina Faso. 2014 Freelance Geologist. Publications on sapphire deposits in Madagascar and a copper deposit in South Australia. Several posters at international geol. conferences and many geol. presentations.
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