glencore - australian coal assets - nsw · pdf filewestside story mine closure and...
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![Page 1: Glencore - Australian Coal assets - NSW · PDF fileWestside Story Mine Closure and Rehabilitation Neil Rae Operations Manager. September 2013. Glencore - Australian Coal assets 3](https://reader031.vdocuments.site/reader031/viewer/2022022005/5ab703b47f8b9a0f058e8710/html5/thumbnails/1.jpg)
Glencore XstrataWestside StoryMine Closure and RehabilitationNeil Rae Operations ManagerSeptember 2013
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3Glencore - Australian Coal assets
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Westside Mine Location
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• Located near Newcastle, North West of Lake Macquarie• Mine Life – Coaling from 1992 to 2012• Mine type – Contract open cut operation• Equipment - Truck and Shovel operation with Dozer push • Annual ROM Production - <1Mtpa• Market – Domestic thermal coal• Great Northern and Fassifern seams extracted
Westside Mine
Site Description
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Westside Mine
Aerial progress photographs
1999 2003
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Westside Mine
Aerial progress photographs
2007 2010
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Westside Mine
Integration of Mining sequence and rehabilitation
Key Drivers
• No Highwalls to be left on site
• Minimise time between finish of mining and finish of bulk shape
• Minimise carbonaceousmaterial on the surface• Sequence overburden removal and de-coaling to meet
these objectives
South Pit
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Westside Mine
Integration of Mining sequence and rehabilitation
Coaling direction
Dump progression against East highwall
South Pit / Future Final VoidSnap shot in Sept 2011
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Westside Mine
Final Void Rehabilitation - Shaping
Final Void Shaping- Bulk shaping completed 1 week after coaling completed
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Westside Mine
Integration of Mining sequence and rehabilitation
Final Void- Mining Completed Feb 2012 (1 x D11 on bulk shape)- Rehab completed April 2012 (1 x D6 rip/contour drains, 1 x 20t digger, 1 x 20t truck)
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Westside Mine
Rehabilitation Methodology
•Bulk shape
•Spread topsoil
•Contour drains
•Spread bulk ameliorants (Gypsum)
•Rip on contour
•Gather rocks into mounds
•Seed Preparation/mixing
•Seed/Fertiliser broadcasting
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Westside Mine
Rationalisation and Mine Closure
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3Rehabilitation Status
Comments:• December 2012 Rehabilitation
• Haul road width reduction to minimise dirty storm water run-off
• Bunds removed, drains constructed and revegetated with couch grass
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Westside Mine
Mine Closure activities
• Conceptual Mine Closure Plan;
• Annual E & C Broad Brush Risk Assessments/reviews;
• Pre Feasibility Constraints and Opportunities Analysis;
• Contamination Assessments;
• Kepner Tregoe Analysis of indentified land use options for each domain;
• OCAL Reject Emplacement Strategy;
• Final Void Management Plan;
• Closure cost reviews;
• Mine Closure Consultation Strategy;
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Westside Mine
Mine Closure activities (continued)
• Mine Closure Project Schedule;
• Site geotechnical analysis including slope stability;
• Mine Closure Risk Assessment;
• Final Land Use Strategy;
• Closure Criteria Development and sign-off;
• Mine Closure MOP;
• Westside Closure Project execution plan (Bucket list);
• Small workforce, redundancies/retention option, re-employment within the industry;
• Ongoing Land/Water Management and rehabilitation monitoring.
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• Closure criteria were developed using more than 10 years of biodiversity and
rehabilitation monitoring for inclusion in the Mine Closure MOP
• Each mine closure domain has its own criteria based on proposed final land use
• Closure criteria were approved by the Department of Resources and Energy.
Mine Closure and Rehabilitation
Closure Criteria Development
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Westside Mine
Westside Mine Domains
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Westside Mine
Signed-off Closure criteria
• Criteria are broad, straight forward and relatively easy to assess.
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Westside Mine
Signed-off Closure criteria
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Westside Mine
Signed-off Closure criteria
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North Pit Rehabilitation
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• Second generation tree seedlings are present
• More than 75% of trees are healthy and growing
• No treeless areas greater than 0.5 ha are present
• Monitoring demonstrates considerable soil profile development
• 70% of nest boxes in Northern Rehabilitation occupied by native arboreal mammals.
• 30 native flora species present • 32 native fauna species present
Biodiversity monitoring
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3Rehabilitation Sign off
• The Dept Resources and Energy has provided confirmation that the North Pit Rehabilitation area is progressing satisfactorily towards the agreed closure criteria.
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• High levels of species
diversity (over 34 native
species present)
• High level of regeneration
and recruitment
• Over 40 fauna species
recorded
• Three threatened fauna
species identified
Biodiversity monitoring
South Pit Rehabilitation
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Rehabilitation
South Pit Rehabilitation, near Dam E - Progression
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Westside Mine - Aerial view June 2013
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Westside Story Video
Westside’s Life of Mine Rehabilitation