DBPapers
DOI: 10.5593/SGEM2014/B13/S3.047

MINERAL EXPLORATION OF ALLUVIAL GOLD - COMPARATIVE RESULTS USING 11" AND 50" DIAMETER BOREHOLES

D. Drymonitis
Wednesday 1 October 2014 by Libadmin2014

References: 14th International Multidisciplinary Scientific GeoConference SGEM 2014, www.sgem.org, SGEM2014 Conference Proceedings, ISBN 978-619-7105-09-4 / ISSN 1314-2704, June 19-25, 2014, Book 1, Vol. 3, 353-360 pp

ABSTRACT
I.G.M.E. (Institute of Geology and Mineral Exploration) (at present N.C.S.D.) has carried out a major exploration project for alluvial gold deposits in Northern Greece since 1975. The orebody under study is one of great interest in North-Eastern Greece, where a great exploration project has been carried out. During the first exploration stage 94 boreholes, 11” in diameter were drilled and about 5,000 samples taken. A first geostatistical ore reserves estimation was carried out. Having decided that the deposit is economically interesting, a new exploration campaign was carried out by drilling 8 new boreholes, 50” in diameter, close to the corresponding 11” boreholes. The analyses of the 50” diameter samples showed a significant increase of the gold content of about 42% in average. This important and interesting analytical outcome lead to the re-evaluation of the variables of the deposit, to define the source of this significant difference.

Keywords: mineral exploration, alluvial gold, drilling, geostatistics, correction factors.