Waste rock dilution in stoping of steeply dipping narrow-vein deposits

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en
dc.contributor.advisor Hänninen, Tuomo
dc.contributor.author Louwerse, Dennis
dc.date.accessioned 2018-12-14T16:13:03Z
dc.date.available 2018-12-14T16:13:03Z
dc.date.issued 2018-12-10
dc.identifier.uri https://aaltodoc.aalto.fi/handle/123456789/35556
dc.description.abstract On the basis of literature reviews, monitoring operational parameters and stope performance, the origins of and the main influences on unplanned waste rock dilution in narrow-vein stoping at the Jokisivu mine were allocated. Stope scanning with a cavity monitoring system (CMS) indicated that most of the unplanned dilution originates from the hangingwall side of the stopes, but also stope footwalls show levels of sloughage. Combining visual observations with scanned stope models, knowledge of past experiences and existing geological structures, revealed that there are two main factors governing the level of unplanned dilution at the Jokisivu operation. The first group of factors are the local geological setting, geological structures and rock-mechanical properties of the host rock. The second factor is the inaccuracy in marking drillhole collar locations. Large deviations in marking drillhole collar locations resulted in designed stope boundaries not being met or being exceeded. This in turn caused additional dilution and ore loss. After monitoring operational parameters and stope performance, several methods have been proposed to minimize unplanned waste rock dilution in future practices of the Jokisivu operation. Prominent measures being the implementation of an alternative method of marking drillhole collar location, reinforcing stope hangingwall support and the continuous monitoring of stopes via the use of a CMS. en
dc.format.extent 89+39
dc.language.iso en en
dc.title Waste rock dilution in stoping of steeply dipping narrow-vein deposits en
dc.type G2 Pro gradu, diplomityö fi
dc.contributor.school Insinööritieteiden korkeakoulu fi
dc.subject.keyword dilution en
dc.subject.keyword drillhole deviation en
dc.subject.keyword stope scanning en
dc.subject.keyword narrow-vein stoping en
dc.identifier.urn URN:NBN:fi:aalto-201812146572
dc.programme.major European Mining Course fi
dc.programme.mcode ENG3077 fi
dc.type.ontasot Master's thesis en
dc.type.ontasot Diplomityö fi
dc.contributor.supervisor Rinne, Mikael
dc.programme European Mining, Minerals and Environmental Programme (EMMEP) fi
local.aalto.electroniconly yes
local.aalto.openaccess no

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