TERRAMIN AUSTRALIA Limited Angas Zinc Project. Tailings Storage Facility Overview Long presentation...
-
Upload
rosaline-malone -
Category
Documents
-
view
221 -
download
0
Transcript of TERRAMIN AUSTRALIA Limited Angas Zinc Project. Tailings Storage Facility Overview Long presentation...
![Page 1: TERRAMIN AUSTRALIA Limited Angas Zinc Project. Tailings Storage Facility Overview Long presentation – may of necessity be a bit technical Why we need.](https://reader036.fdocuments.net/reader036/viewer/2022062322/56649f0d5503460f94c208b7/html5/thumbnails/1.jpg)
TERRAMIN AUSTRALIA LimitedTERRAMIN AUSTRALIA Limited
Angas Zinc Angas Zinc ProjectProject
![Page 2: TERRAMIN AUSTRALIA Limited Angas Zinc Project. Tailings Storage Facility Overview Long presentation – may of necessity be a bit technical Why we need.](https://reader036.fdocuments.net/reader036/viewer/2022062322/56649f0d5503460f94c208b7/html5/thumbnails/2.jpg)
Tailings Storage Facility Tailings Storage Facility Overview Overview
• Long presentation – may of necessity be a bit technical• Why we need a Tailings Storage Facility (TSF)• The Design Process
– Requirements– Guidelines– Testwork
• Tailings Handling method• Water management• Design selection• Closure• Location – Flood Plain
![Page 3: TERRAMIN AUSTRALIA Limited Angas Zinc Project. Tailings Storage Facility Overview Long presentation – may of necessity be a bit technical Why we need.](https://reader036.fdocuments.net/reader036/viewer/2022062322/56649f0d5503460f94c208b7/html5/thumbnails/3.jpg)
Angas Zinc Project: Angas Zinc Project: Tailings storageTailings storage
• Mining & processing ore creates non-saleable by-products
• “Tailings”- fine sand of the waste rock
• Often combined with water
• Stored close to site of processing
• About 40% goes back underground as “cemented backfill”
• However, need to design for “worst case”
![Page 4: TERRAMIN AUSTRALIA Limited Angas Zinc Project. Tailings Storage Facility Overview Long presentation – may of necessity be a bit technical Why we need.](https://reader036.fdocuments.net/reader036/viewer/2022062322/56649f0d5503460f94c208b7/html5/thumbnails/4.jpg)
THE TSF DESIGN PROCESS
![Page 5: TERRAMIN AUSTRALIA Limited Angas Zinc Project. Tailings Storage Facility Overview Long presentation – may of necessity be a bit technical Why we need.](https://reader036.fdocuments.net/reader036/viewer/2022062322/56649f0d5503460f94c208b7/html5/thumbnails/5.jpg)
TSF GuidelinesTSF Guidelines
• ANCOLD Guidelines used, no current Guidelines in SA. ANCOLD draws substantially from WA “Guidelines on the Safe Design & Operation Standards for Tailings Storage” but goes further in the area of dam design
• PIRSA -EPA “Guidelines for the Management of Tailings” at the proposed Angas Zinc Project, Strathalbyn, SA
![Page 6: TERRAMIN AUSTRALIA Limited Angas Zinc Project. Tailings Storage Facility Overview Long presentation – may of necessity be a bit technical Why we need.](https://reader036.fdocuments.net/reader036/viewer/2022062322/56649f0d5503460f94c208b7/html5/thumbnails/6.jpg)
TSF - designTSF - design
• Australian Tailings Consultants
• TSF objective:
– No contamination of natural water drainage systems, ground water, land and soils either on or off site during operation and indefinitely post closure caused by mine ore or waste material.
![Page 7: TERRAMIN AUSTRALIA Limited Angas Zinc Project. Tailings Storage Facility Overview Long presentation – may of necessity be a bit technical Why we need.](https://reader036.fdocuments.net/reader036/viewer/2022062322/56649f0d5503460f94c208b7/html5/thumbnails/7.jpg)
TSF -TSF -The TestworkThe Testwork
• Test pits • In-situ permeability testing.• Lab. testing of soils.• Geochemical & geotechnical testing of simulated
tailings.• Impoundment layout & bank design - modeling.• Seepage analyses, assessment of groundwater
impact & design of proposed mitigating measures.• Location, design & installation of groundwater
monitoring bores.• Water mgt. both process & rainfall.• Proposals for TSF closure & rehabilitation***
![Page 8: TERRAMIN AUSTRALIA Limited Angas Zinc Project. Tailings Storage Facility Overview Long presentation – may of necessity be a bit technical Why we need.](https://reader036.fdocuments.net/reader036/viewer/2022062322/56649f0d5503460f94c208b7/html5/thumbnails/8.jpg)
TSF - TSF - Tailings Handling OptionsTailings Handling Options
Two Options:
• Un-thickened tailings– Majority of TSF in Australia
• Thickened tailings– Few places in the World using very high
density tails deposition – used when water is scarce, ease of closure***
![Page 9: TERRAMIN AUSTRALIA Limited Angas Zinc Project. Tailings Storage Facility Overview Long presentation – may of necessity be a bit technical Why we need.](https://reader036.fdocuments.net/reader036/viewer/2022062322/56649f0d5503460f94c208b7/html5/thumbnails/9.jpg)
Advantages of thickened tailingsAdvantages of thickened tailings
• Low water demand• No water pond to attract birds• Tailing surface crust stops dusting• Beach area dries rapidly allows early
access.
• Allows for progressive closure
![Page 10: TERRAMIN AUSTRALIA Limited Angas Zinc Project. Tailings Storage Facility Overview Long presentation – may of necessity be a bit technical Why we need.](https://reader036.fdocuments.net/reader036/viewer/2022062322/56649f0d5503460f94c208b7/html5/thumbnails/10.jpg)
TSF - Thickened tailingsTSF - Thickened tailings
• Wheaton River’s, Peak Mine - Cobar
![Page 11: TERRAMIN AUSTRALIA Limited Angas Zinc Project. Tailings Storage Facility Overview Long presentation – may of necessity be a bit technical Why we need.](https://reader036.fdocuments.net/reader036/viewer/2022062322/56649f0d5503460f94c208b7/html5/thumbnails/11.jpg)
Thickened tailingsThickened tailings
• Wheaton River’s, Peak Mine - Cobar
![Page 12: TERRAMIN AUSTRALIA Limited Angas Zinc Project. Tailings Storage Facility Overview Long presentation – may of necessity be a bit technical Why we need.](https://reader036.fdocuments.net/reader036/viewer/2022062322/56649f0d5503460f94c208b7/html5/thumbnails/12.jpg)
Water management
![Page 13: TERRAMIN AUSTRALIA Limited Angas Zinc Project. Tailings Storage Facility Overview Long presentation – may of necessity be a bit technical Why we need.](https://reader036.fdocuments.net/reader036/viewer/2022062322/56649f0d5503460f94c208b7/html5/thumbnails/13.jpg)
TSF - Water TSF - Water ManagementManagement
![Page 14: TERRAMIN AUSTRALIA Limited Angas Zinc Project. Tailings Storage Facility Overview Long presentation – may of necessity be a bit technical Why we need.](https://reader036.fdocuments.net/reader036/viewer/2022062322/56649f0d5503460f94c208b7/html5/thumbnails/14.jpg)
TSF - Water management: TSF - Water management: Water from TSF to PlantWater from TSF to Plant
![Page 15: TERRAMIN AUSTRALIA Limited Angas Zinc Project. Tailings Storage Facility Overview Long presentation – may of necessity be a bit technical Why we need.](https://reader036.fdocuments.net/reader036/viewer/2022062322/56649f0d5503460f94c208b7/html5/thumbnails/15.jpg)
TSF - Water managementTSF - Water management
Summary
• Divert all surface flows from surrounding area around the TSF
• Dam design allows for the catchment of a 1:100yr 5 day storm event
• No water pond on TSF
![Page 16: TERRAMIN AUSTRALIA Limited Angas Zinc Project. Tailings Storage Facility Overview Long presentation – may of necessity be a bit technical Why we need.](https://reader036.fdocuments.net/reader036/viewer/2022062322/56649f0d5503460f94c208b7/html5/thumbnails/16.jpg)
The TSF Design Selection
![Page 17: TERRAMIN AUSTRALIA Limited Angas Zinc Project. Tailings Storage Facility Overview Long presentation – may of necessity be a bit technical Why we need.](https://reader036.fdocuments.net/reader036/viewer/2022062322/56649f0d5503460f94c208b7/html5/thumbnails/17.jpg)
TSF DesignTSF Design
![Page 18: TERRAMIN AUSTRALIA Limited Angas Zinc Project. Tailings Storage Facility Overview Long presentation – may of necessity be a bit technical Why we need.](https://reader036.fdocuments.net/reader036/viewer/2022062322/56649f0d5503460f94c208b7/html5/thumbnails/18.jpg)
Risk Analysis
![Page 19: TERRAMIN AUSTRALIA Limited Angas Zinc Project. Tailings Storage Facility Overview Long presentation – may of necessity be a bit technical Why we need.](https://reader036.fdocuments.net/reader036/viewer/2022062322/56649f0d5503460f94c208b7/html5/thumbnails/19.jpg)
TSF-Risk AnalysisTSF-Risk Analysis
![Page 20: TERRAMIN AUSTRALIA Limited Angas Zinc Project. Tailings Storage Facility Overview Long presentation – may of necessity be a bit technical Why we need.](https://reader036.fdocuments.net/reader036/viewer/2022062322/56649f0d5503460f94c208b7/html5/thumbnails/20.jpg)
TSF location & detailTSF location & detail
QuickTime™ and aTIFF (LZW) decompressor
are needed to see this picture.
![Page 21: TERRAMIN AUSTRALIA Limited Angas Zinc Project. Tailings Storage Facility Overview Long presentation – may of necessity be a bit technical Why we need.](https://reader036.fdocuments.net/reader036/viewer/2022062322/56649f0d5503460f94c208b7/html5/thumbnails/21.jpg)
TSF construction: base layerTSF construction: base layer
![Page 22: TERRAMIN AUSTRALIA Limited Angas Zinc Project. Tailings Storage Facility Overview Long presentation – may of necessity be a bit technical Why we need.](https://reader036.fdocuments.net/reader036/viewer/2022062322/56649f0d5503460f94c208b7/html5/thumbnails/22.jpg)
TSF options- detailTSF options- detail
• Proposed Design Option: Decant well
![Page 23: TERRAMIN AUSTRALIA Limited Angas Zinc Project. Tailings Storage Facility Overview Long presentation – may of necessity be a bit technical Why we need.](https://reader036.fdocuments.net/reader036/viewer/2022062322/56649f0d5503460f94c208b7/html5/thumbnails/23.jpg)
TSF DesignTSF Design
Design Summary: • HDPE liner (base and cap)• Thickened tailings
• Liner ensures TSF design requirement
• Placement: beyond 1:100 ARI flood level
• Footprint:15ha
• World’s Best Practice
![Page 24: TERRAMIN AUSTRALIA Limited Angas Zinc Project. Tailings Storage Facility Overview Long presentation – may of necessity be a bit technical Why we need.](https://reader036.fdocuments.net/reader036/viewer/2022062322/56649f0d5503460f94c208b7/html5/thumbnails/24.jpg)
TSF Closure
![Page 25: TERRAMIN AUSTRALIA Limited Angas Zinc Project. Tailings Storage Facility Overview Long presentation – may of necessity be a bit technical Why we need.](https://reader036.fdocuments.net/reader036/viewer/2022062322/56649f0d5503460f94c208b7/html5/thumbnails/25.jpg)
TSF Closure: capping layersTSF Closure: capping layers
![Page 26: TERRAMIN AUSTRALIA Limited Angas Zinc Project. Tailings Storage Facility Overview Long presentation – may of necessity be a bit technical Why we need.](https://reader036.fdocuments.net/reader036/viewer/2022062322/56649f0d5503460f94c208b7/html5/thumbnails/26.jpg)
TSF ClosureTSF Closure
![Page 27: TERRAMIN AUSTRALIA Limited Angas Zinc Project. Tailings Storage Facility Overview Long presentation – may of necessity be a bit technical Why we need.](https://reader036.fdocuments.net/reader036/viewer/2022062322/56649f0d5503460f94c208b7/html5/thumbnails/27.jpg)
TSF ClosureTSF Closure
• Closure is important aspect for the longer term environmental considerations
• Impervious cover liner
• Earthworks – reshaping, topsoil
• Rapid revegetation
• Risk based closure plan used
![Page 28: TERRAMIN AUSTRALIA Limited Angas Zinc Project. Tailings Storage Facility Overview Long presentation – may of necessity be a bit technical Why we need.](https://reader036.fdocuments.net/reader036/viewer/2022062322/56649f0d5503460f94c208b7/html5/thumbnails/28.jpg)
Flood Plain ModellingFlood Plain Modelling
![Page 29: TERRAMIN AUSTRALIA Limited Angas Zinc Project. Tailings Storage Facility Overview Long presentation – may of necessity be a bit technical Why we need.](https://reader036.fdocuments.net/reader036/viewer/2022062322/56649f0d5503460f94c208b7/html5/thumbnails/29.jpg)
TSF placement to meet outcomesTSF placement to meet outcomes
• 100m from 1:100 ARI flood plain
• Flood modelling
• Tonkin- Chris Purton: Senior Meteorologist
![Page 30: TERRAMIN AUSTRALIA Limited Angas Zinc Project. Tailings Storage Facility Overview Long presentation – may of necessity be a bit technical Why we need.](https://reader036.fdocuments.net/reader036/viewer/2022062322/56649f0d5503460f94c208b7/html5/thumbnails/30.jpg)
Historic Rainstorms and Floods at Strathalbyn
• The largest rainfall event in 145 years was the three day rainstorm ending 9am, 26 January 1941 – 217mm
• The December 1992 monthly rainfall was 171.2 mm, which was the second highest monthly rainfall on record. The two-day total of 116 mm and the three-day total of 124 mm both had an ARI of just under 100 years
![Page 31: TERRAMIN AUSTRALIA Limited Angas Zinc Project. Tailings Storage Facility Overview Long presentation – may of necessity be a bit technical Why we need.](https://reader036.fdocuments.net/reader036/viewer/2022062322/56649f0d5503460f94c208b7/html5/thumbnails/31.jpg)
Historic Rainstorms and Floods at Strathalbyn
![Page 32: TERRAMIN AUSTRALIA Limited Angas Zinc Project. Tailings Storage Facility Overview Long presentation – may of necessity be a bit technical Why we need.](https://reader036.fdocuments.net/reader036/viewer/2022062322/56649f0d5503460f94c208b7/html5/thumbnails/32.jpg)
1:100yr ARI Flood Plain
![Page 33: TERRAMIN AUSTRALIA Limited Angas Zinc Project. Tailings Storage Facility Overview Long presentation – may of necessity be a bit technical Why we need.](https://reader036.fdocuments.net/reader036/viewer/2022062322/56649f0d5503460f94c208b7/html5/thumbnails/33.jpg)
1:100yr ARI Flood Plain
• Conclusion
• Since the terrain rises steeply from the maximum indicated floodplain extent (without a bund) towards the proposed Tailing Storage Facility site, it is certain that the floodplain extent will not extend any further into the mining lease site than is shown in Figure 1.3
![Page 34: TERRAMIN AUSTRALIA Limited Angas Zinc Project. Tailings Storage Facility Overview Long presentation – may of necessity be a bit technical Why we need.](https://reader036.fdocuments.net/reader036/viewer/2022062322/56649f0d5503460f94c208b7/html5/thumbnails/34.jpg)
Tailings Storage Facility Tailings Storage Facility SummarySummary
• Every TSF design has some unique issues• To design a TSF you must do a lot of standard tests to;
– Tails characterisation ,sg, sizings, settling rates geochem., etc.– Soil characterisation geotechnical stability, permeability, etc– Seismic susceptibility
• There is nothing out of the ordinary in the testwork required in the design for the TSF – follow the relevant codes
• What is required is the first of its kind in the world