DBPapers

PASTE BACKFILL PREPARATION AND APPLICATION FOR UNDERGROUND BACKFILLING PROCESS

AUTHOR/S: YILMAZ, E., KESIMAL, A., ERCIKDI, B.
Sunday 1 August 2010 by Libadmin2004

4th International Scientific Conference - SGEM2004, www.sgem.org, SGEM2004 Conference Proceedings/ ISBN: 954-918181-2, June 14-18, 2004, 135- 144pp

ABSTRACT

Paste backfill was first developed by Preussag at the Bad Grund Mine. Filtered
tailings were combined with 30 mm heavy media separation tailings to produce a
paste backfill. These ingredients were combined and mixed on surface and pumped to
the underground mine using two Putzmeister concrete pumps working in parallel. Dry
cement was added to the paste mixture just prior to being placed into the stope. The
resulting fill then formed the roof for the next cut using an undercut and fill mining
method. The experimental work carried out resulted in the design criteria required to
manufacture, transport and place a thickened fill in an efficient cost effective manner.
The most important requirement to produce a paste is the presence of a sufficient
quantity of fine particles. In most cases, paste fill must contain at least 15 per cent by
weight of particles less than 20 microns in diameter. Tailings from the milling or
processing operation of a mine are the most common source of solid material for paste
backfill in the mining industry. This paper explains paste backfill preparation and its
application as underground backfilling process.