The use of scale independent shape measures to assess open stope performance

Cepuritis, Peter

doi:10.1016/j.ijrmms.2011.07.005

Cited by 2 publications

(2 citation statements)

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“…Cavity performance consists of comparing the resulting void from rock breakage versus the designed, planned volume. The conventional parameters used to assess stope mining performance quantify and minimise two parameters, dilution and ore loss (Cepuritis 2011;Villaescusa 2014). Dilution is a portion of the rock blasted within a design that has no economic benefit, and ore loss is a portion of the ore included in a particular design that did not break.…”

Section: Drawbell Performance Assessment Based On Cavity Analysismentioning

confidence: 99%

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Geotechnical analysis of blasting sequence and resulting shapes of drawbells in block cave mines

2023

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Drawbells allow disassembled ore to be extracted from the production levels in block cave mines. As part of the construction process, blast damage must be minimised, enabling the remaining rock mass surrounding the drawbell to sustain the induced stress during the different stages of a block-caving operation for a successful mine plan extraction and ore recovery.This paper proposes two approaches for the geotechnical evaluation of drawbell blast performance. Initially, the expected dynamic burden is calculated along the length of the blasthole and used to assess surveyed blast holes. Secondly, the design compliance is evaluated using the Radial Distance of Over/Underbreak concept, which compares designed and scanned shapes relative to height and radial orientation.The results have identified confined blast zones at the top and around the corners of drawbells. Excessive confinement may cause damage to the pillars and negatively impact the stability of the production level.

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Section: Drawbell Performance Assessment Based On Cavity Analysismentioning

confidence: 99%

“…Some of the conventional performance calculations are usually undertaken to analyse excavation walls (Cepuritis 2011). However, for drawbells, this may be unsuitable due to the likely shadow effects and the muckpile zone conditions shown in Figure 8.…”

Section: Drawbell Performance Assessment Based On Cavity Analysismentioning

confidence: 99%