A Comparison of Methods to Create the Initial Void for Longhole Open Stoping Blasting
2014 (English)In: Mining Education Australia (MEA) Journal of Research Projects Review, ISSN 2203-529X, Vol. 3, no 1, 27-31 p.Article in journal (Refereed) Published
This study is based on confidential case studies collected from a Western Australian gold mine, known from here on in as ‘Mine X’. The primary mining method used at Mine X is longhole retreat open stoping with paste backfill. The main objective of this research project is to investigate which method/s is the most appropriate to develop the initial void for stope blasting at Mine X.Two methods were investigated during this research; conventional longhole rising and slashing against paste. Rising is a very common method, used frequently at Mine X as well as in the broader mining industry as determined through a literature review. Because of the common use of rising, it was expected to be a more reliable option resulting in a higher success rate. Slashing against paste, however, is a new method to the industry and not well documented, but was trialled as a possible cheaper option. These two methods were compared in terms of: success rate; drill and blast costs; limitations for their use; and benefits derived from combining the two methods.The analysis of the case studies revealed several key points. Firstly, the success rate estimated by comparing stope design geometry and final surveyed shape showed that both methods achieved the same success rate of 78 per cent. The cost analysis determined that the average rise required more than double the costs per tonne of rock than slashing against paste. Slashing against paste was found to be a much more restrictive option, requiring new stopes to be situated next to paste filled stopes of specific dimensions. Rising does not have these restrictions; however, more often required slot drives to be developed prior to stoping than slashing against paste. Combining the two methods proved to be a beneficial option having the advantages of both methods. Overall this study recommends, for Mine X, the use of slashing against paste over rising in situations where slashing against paste is permitted. All other situations should consider the use of rising or a combination of rising and slashing against paste.
Place, publisher, year, edition, pages
2014. Vol. 3, no 1, 27-31 p.
Underground mines, blasting, Civil engineering and architecture - Geoengineering and mining engineering
Samhällsbyggnadsteknik och arkitektur - Geoteknik och gruvteknik
Research subject Mining and Rock Engineering
IdentifiersURN: urn:nbn:se:ltu:diva-10102Local ID: 8d97b98b-64ea-44b9-a6b0-125f5c4f0530OAI: oai:DiVA.org:ltu-10102DiVA: diva2:983042
Upprättat; 2014; 20140919 (adrhal)2016-09-292016-09-29