Sublevel open stoping hanging wall instrumentation program at the Dugald River underground mine

Carswell, J; Player, John; Vries, Renko de; Hassell, Rhett

doi:10.36487/acg_rep/1508_38_carswell

Cited by 3 publications

(4 citation statements)

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“…The data used in this paper are from the underground Dugald River mine in Queensland, Australia (Figure 9). Longitudinal and transversal stopes are used to extract the Zn-Pb Ag ore. Stope dimensions can vary depending on the area of the mine but are approximately 25 m high and 15-30 m long (Hassell et al 2015). Stope width varies between 2 and 35 m depending on the thickness of the orebody.…”

Section: Case Studymentioning

confidence: 99%

“…Of these 173 stopes, 41 are a part of the north area of the mine and 132 are a part of the south part of the mine. Nineteen stopes were also part of the 2014 trial stoping stage that was conducted to test the validity of the geotechnical and mining parameters (Hassell et al 2015). For the analysis, the 2014 trial stoping, as well as stopes with data quality concerns, has been removed resulting in a total of 130 stopes.…”

Section: Data Overviewmentioning

confidence: 99%

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Assessing stope performance using georeferenced octrees and multivariate analysis

et al. 2023

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This paper presents the first steps towards a new stope design approach, where stope overbreak (OB; rock mined outside of the design) and underbreak (UB; planned rock left behind) is assessed using statistical multivariate analysis (principal component analysis [PCA] and partial least square [PLS]) and georeferenced data measured at an approximately cubic metre resolution (octrees). Results showed that OB is observed in areas of the stope where there is a large blasting energy proxy, large undercut and towards the middle of the face. UB tends to be observed near the border of the faces and where there is large blasting standoff and toeing of the rings. The resolution of the data and the use of multivariate analysis have enabled the depiction of an accurate interpretation of the variation of stope performance along the design surface, going beyond the simple per face analysis.

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Section: Case Studymentioning

confidence: 99%

Section: Data Overviewmentioning

confidence: 99%

Assessing stope performance using georeferenced octrees and multivariate analysis

et al. 2023

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“…A variety of instrument types and measurement techniques were utilised (19, 10 and 6 m length multiple point extensometers, 3 m length single point resistance wire extensometers, cavity monitoring system, and time domain reflectometry cables). The focus of the instrumentation program was to analyse the rock mass response within the HW of the trial stopes ( Figure 6 from Carswell et al 2015). Instrumentation was also installed along oredrives and FW development areas to determine the extent of rock mass response relative to the stoping front.…”

Section: Hw and Development Instrumentationmentioning

confidence: 99%

Geotechnical design considerations for Dugald River — from slot to sequence

Vries¹,

Hassell²,

Player³

2015

Proceedings of the International Seminar on Design Methods in Underground Mining

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Concerns regarding the uncertainty of stope dilution at the MMG Limited's Dugald River underground mine led to a trial stoping program to acquire full-scale comprehensive geotechnical information and to test the validity of the geotechnical and mining parameters. A total of 19 stopes were mined by sublevel open stoping with cemented rockfill (CRF). Specific studies were completed on the rock mass response to mining, rock stress and property measurements, stope blast vibration monitoring, production drilling deviation, CRF optimisation, re-logging of diamond core for structural and geotechnical information. Based on the trial stoping results, key geotechnical inputs into mine design and scheduling were provided. These included:  Stope drill and blast parameters such as borehole orientation, explosive type and stope boundary stand-off distances.  Oredrive and crosscut drive locations to achieve required stope drilling parameters.  Stope strike length and overbreak predictions.  CRF optimisation.  Development through CRF.  The location and sizing of capital development in relation to orebody and major lithological units.  Ground support standards based on expected damage from stress.  Stope sequencing to minimise stress concentrations and location of regional pillars. The considerable volume of data and the practical experience gained during the trial mining greatly increased the geotechnical knowledge of the rock mass and its response to mining. This allowed for a wide range of geotechnical design considerations to be applied to the project feasibility study at a higher confidence level.

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“…More detailed descriptions of the trial stoping program and outcomes can be found in de Vries et al (2015), Hassell et al (2015a;2015b) and Carswell et al (2015). Key mine design and scheduling parameters were established, including:…”

Section: Trial Stopingmentioning

confidence: 99%

Dugald River case study — the importance of understanding your orebody and designing your mine for maximum value

Harris¹

2015

Proceedings of the International Seminar on Design Methods in Underground Mining

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The Dugald River Zn-Pb-Ag deposit was first discovered pre-1880, and is regarded as one of the largest and highest-grade undeveloped deposits of zinc in the world with a mineral resource of 55 Mt at 13.4% zinc, 2.1% lead and 36 g/t silver. It was largely neglected until the 1950s, when systematic exploration was conducted; however, due to low base metal prices and the discovery and development of nearby deposits, the orebody remained undeveloped.Exploration decline development started in February 2012, providing early access to the orebody. Towards the end of 2012, exposure of the geological conditions in oredrive development and from underground diamond drilling highlighted a more complex and challenging mining environment than understood from the feasibility study.It is the purpose of this paper to explain in some detail the evolution in the technical understanding of the Dugald River deposit following its acquisition by MMG Limited. The advancement of technical knowledge not only led to a reduction in project risk and uncertainty, but also had significant impact on mine design and the project development plan.The importance of understanding and continually responding to the unique characteristics of an ore body and designing your project to maximise long-term value has been reinforced at Dugald River.

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Sublevel open stoping hanging wall instrumentation program at the Dugald River underground mine

Cited by 3 publications

References 0 publications

Assessing stope performance using georeferenced octrees and multivariate analysis

Assessing stope performance using georeferenced octrees and multivariate analysis

Geotechnical design considerations for Dugald River — from slot to sequence

Dugald River case study — the importance of understanding your orebody and designing your mine for maximum value

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