The effect of stress damage on dilution in narrow vein mines

Stewart, P. C., Slade, J. and Trueman, R. (2005). The effect of stress damage on dilution in narrow vein mines. In: 9th AusIMM Underground Operators' Conference 2005, Proceedings. 9th Underground Operators' Conference, Perth, Australia, (211-222). 7-9 March 2005.

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Author Stewart, P. C.
Slade, J.
Trueman, R.
Title of paper The effect of stress damage on dilution in narrow vein mines
Conference name 9th Underground Operators' Conference
Conference location Perth, Australia
Conference dates 7-9 March 2005
Proceedings title 9th AusIMM Underground Operators' Conference 2005, Proceedings
Journal name 9th AusIMM Underground Operators Conference 2005
Place of Publication Melbourne, Australia
Publisher Australasian Institute of Mining & Metallurgy
Publication Year 2005
Sub-type Fully published paper
Open Access Status File (Author Post-print)
ISBN 9781920806248
Volume 2005
Issue 1
Start page 211
End page 222
Total pages 12
Collection year 2005
Language eng
Abstract/Summary Unplanned dilution has the potential to seriously undermine the economic viability of a mine, and in some cases results in mine closure. The effect of stress damage on dilution has become increasingly relevant as mining depths increase. In the case of narrow vein, mining, the incremental extraction of long-hole rings has the potential to result in a moving high stressed zone at the stope brow. This leads the hanging wall and footwall to experience a spike in the stress to strength ratios as the brow passes. In some cases, the stress to strength ratio may be high enough to result in fracturing or damage to the rock mass. The aim of the study described in this paper was to investigate whether stress damage results in a significant increase in dilution. The study involved analysis of overbreak from 410 case studies from the Kundana Gold mine in Western Australia. Site personnel had already undertaken calibration studies of the stress levels that result in rock mass damage. This calibration, in conjunction with numerical modelling showed that stress damaged stope walls at this mine had on average 50 per cent more overbreak than stope walls where stresses had not exceeded the damage criterion. For a design mining width of 1.5 metres, and with both walls impacted, this represents 36 per cent increase in dilution. After adjustment for possible sources of bias the difference reduced to an average 0.10 metres per stope wall, representing 13 per cent dilution for the mining width under consideration. The potential for stress damage related overbreak should therefore be considered as part of any assessment of narrow vein dilution.
Keyword Calibration
Plant shutdowns
Case studies
Damage criterions
Economic viabilities
Mine closures
Mining depths
Numerical modelling
Rock masses
Strength ratios
Stress levels
Stressed zones
Damage detection
Q-Index Code E1

Document type: Conference Paper
Collection: Sustainable Minerals Institute Publications
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Created: Tue, 02 May 2006, 22:46:10 EST