Monitoring the blast fragmentation of Boliden Mineral's Aitik mine
2007 (English)In: Fourth EFEE World Conference on Explosives and Blasting: [Vienna Conference Proceedings 2007] / [ed] Peter Moser, European Federation of Explosives Engineers , 2007, 47-62 p.Conference paper (Refereed)
The Boliden Mineral's Aitik mine strives to increase the throughput of the primary mills, which requires a better understanding of the blast fragmentation. This article describes detailed fragmentation monitoring work of round, 4141-2. Structural mapping and core drilling, drilling and charging monitoring, VOD-measurements and blast filming were made. The blast fragmentation on the trucks was monitored automatically with Split Online and manually with Split Desktop. Four barrel samples were sieved to obtain the fines part of the fragment size distribution. The Desktop images had to be edited to avoid fragment splitting and merging errors. The Online images contained errors of many kinds and seem to be sensitive to light conditions; measured fragmentation during night-time was about 50% finer than during daytime. The data appear to be log-normally distributed. The average fragment size x50 became either 171±108 mm (Online) or 458±175 mm (Desktop) and the correlation between the online and desktop data is virtually non-existent. Suggestions are also made how to improve the quality of the data. At the end, a complete fragment size distribution down to 0,2 mm for round 4141-2 is constructed by the use of the x50- and x80-values from Split Online and Desktop and the sieved samples, using the Swebrec function.
Place, publisher, year, edition, pages
European Federation of Explosives Engineers , 2007. 47-62 p.
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-39410Local ID: e2929a00-7844-11dc-80da-000ea68e967bISBN: 978-0-9550290-1-1OAI: oai:DiVA.org:ltu-39410DiVA: diva2:1012921
EFEE World Conference on Explosives and Blasting : 09/09/2007 - 11/09/2007
Godkänd; 2007; 20071011 (finn)2016-10-032016-10-03Bibliographically approved