DBPapers
DOI: 10.5593/SGEM2014/B13/S3.069

ROOM AND PILLAR MINING AT OKD, A.S. IN THE CZECH REPUBLIC

J. Golasowski, R. Vochta, V. Hudecek, P. Dvorak , M. Mikolas
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, 529-536 pp

ABSTRACT
This paper will address the many challenges involved in implementing room and pillar mining at great depths in a region that has never tried this method before. The region of the Czech Republic has a long history of bituminous coal mining extending nearly 200 years. Longwall mining has been the traditional method of mining, but due to its subsidence impacts cannot be used under some densely populated areas and thus an experimental project has been undertaken at ČSM Mine operated by OKD, a.s. in the Czech Republic. The room and pillar method was chosen mainly to minimize subsidence impacts, however, mining here is very challenging including but not limited to the following items which will be addressed in the paper. Existing gateroad and roadway development for the mines in this region is typically performed with either roadheaders or drill and blast methodology and steel arches are the primary means of support throughout. Since the room and pillar method of mining is not used here – along with its key features: continuous miners, bolters and other equipment not typically used here, pillars, and explicit use of bolts as the primary support, it must first be demonstrated through empirical means (an authentication process) that it is indeed possible to overcome all of the problems associated with the conditions of the deep mines at OKD in the Czech Republic and de facto, as well in Central Europe. Secondly, the outcome of the authentication process must be sound enough to obtain the consent from the Czech Mining Authority as they, also, are unfamiliar with this method of mining and existing laws and regulations were not written to address some of the particulars of this method of mining. In the framework of the verification/authentication process we will demonstrate compliance with the main objective of the introduction of the room and pillar mining method at OKD which is the minimum effect on the surface and the possibility of its use for exploitation of reserves under densely populated areas where the use of conventional technology by the retreat LW method with regard to the influence of surface is impossible.

Keywords: Room&Pillar, experimental project, new mining method, Longwall mining,surface subsidence, authentication process