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

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master_Louwerse_Dennis_2018.pdf (10.32 MB)

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Insinööritieteiden korkeakoulu | Master's thesis
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Date

2018-12-10

Department

Major/Subject

European Mining Course

Mcode

ENG3077

Degree programme

European Mining, Minerals and Environmental Programme (EMMEP)

Language

en

Pages

89+39

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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.

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Supervisor

Rinne, Mikael

Thesis advisor

Hänninen, Tuomo

Keywords

dilution, drillhole deviation, stope scanning, narrow-vein stoping

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https://urn.fi/URN:NBN:fi:aalto-201812146572

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[dipl] Insinööritieteiden korkeakoulu / ENG