DBPapers

LIGNITE RECOVERY IN MULTI- SEAM OPEN-PIT MINING OPERATIONS IN NORTHERN GREECE

AUTHOR/S: KOLOVOS, N., SOTIROPOULOS, D., GEORGAKOPOULOS, A.
Sunday 1 August 2010 by Libadmin2003

3rd International Scientific Conference - SGEM2003, www.sgem.org, SGEM2003 Conference Proceedings/ ISBN: 954-918181-2, June 9-13, 2003, 59- 66pp

ABSTRACT

This paper illustrates, by means of the case study of the most important
lignite deposit in Northern Greece, the lignite recovery in multi-seam or “zebra”
type lignite deposits. It discusses the difficulties encountered in most efficiently
producing lignite from this type of sequence, characterized by the multiple
interchanges of lignite layers and thin sterile intercalations consisting mainly of
clays, marls and sands. The knowledge of the geometry and the quality
characteristics of the recoverable lignite are of the utmost importance in designing
efficient lignite exploitation. Technical and quality criteria are taken into account
to obtain the maximum lignite recovery, fulfilling certain technical and quality
specifications. These criteria are related to the geometry and quality parameters of
the recoverable lignite, the geometry and quality parameters of the sterile
intercalations either those included in the excavation block or those which are
dumped, and the selective mining losses. Using these criteria, lignite recovery up
to 91.9% is achieved.