Source document: https://docs-lawep.s3.us-east-2.amazonaws.com/1697643804048.pdf (Australia)
WA Bauxite Rehabilitation Overview Rehabilitation Huntly Mine 06 March 2017 Visit Agenda 13:00 – 13:05 Arrive at Myara Mine 13:05 – 13:30 WA Mining Rehabilitation Overview presentation 13:30 – 14:05 Tour active mining operations 14:05 – 14:45 Site visit: Rehabilitation (4 & 7 years) 14:45 – 15:30 Site visit: Huntly Lookout (mature rehabilitation) 15:30 Tour Complete 15/03/2018 2 Your safety today Fall from Height Confined Space Electric Shock Mobile Equipment Crane / Lifting Uncontrolled Release of Energy Haul Trucks Critical Risks 6 + 1  PPE required  Know the Muster Point  Stay close and together!
15/03/2018 3 3 World class integrated mining and refining system underpinned by a secure mineral lease ▪ Three alumina refineries: Kwinana, Pinjarra and Wagerup ▪ Two dedicated port facilities: Kwinana and Bunbury Perth ▪ Two bauxite mines: Huntly, 2nd largest bauxite mine in the world, 26 million tonnes a year; and Willowdale 10.2 million tonnes a year ▪ Mineral Lease of 7,129 km2 granted under State Agreement.
Less than 10% of lease planned to be mined Kwinana Alumina Refinery Shipping Mandurah Jarrahdale Huntly Bauxite Mine ▪ Exclusive rights to mine bauxite 1961-2045, with option to extend Pinjarra Alumina Refinery Dwellingup Boddington Wagerup Alumina Refinery Willowdale Bauxite Mine ▪ Access to bauxite contingent on preserving and restoring recreation, water catchment, timber resource and conservation land-use values Bunbury Shipping ▪ To the end of 2016; 24,556ha cleared for mining, 18,927ha of which is under rehabilitation with ~14,500 ready for handback Collie 15/03/2018 4 Huntly Bauxite Mine: the second largest bauxite mine in the world Overview ▪ Established in 1976 (Jarrahdale 1963 – 1998) ▪ Produces around 26 million tonnes per year ▪ Bauxite via overland convening system to Pinjarra Refinery ▪ Bauxite via overland conveying system and rail to Kwinana Refinery ▪ Current crusher location at Myara – east of North Dandalup ▪ Approximately 600 employees and over 100 contractors ▪ Recognised work leader in mine site rehabilitation 5 Privileged to mine in the world’s only natural jarrah forest Mining in a unique environment ▪ Contains more than 800 plant species ▪ Recognised as one of the world’s biodiversity hotspots ▪ The forest is highly valued – recreation, water catchment, timber resource, conservation ▪ Access to bauxite contingent on preserving and restoring these land-use values 6 Stage 1: Development Stage 2: Pre-mining Stage 3: Load and haul Stage 4: Crushing, conveying and refining ▪ ▪ ▪ ▪ Dieback Mapping Drilling Pre-Mining Surveys ➢ European Heritage ➢ Aboriginal Heritage ➢ Fauna ➢ Flora Logging & Clearing – Forest Products Commission Top soil/Overburden Ripping ▪ Wood Waste SOBR Blasting Rehabilitation process Landscaping Pre-ripping Soil Return Contour Ripping Contour Ripping Planting Fertilising Completion criteria and mine closure • • • • • • • 1996 First completion criteria for ‘post-1988’ rehabilitation developed 2001 Jarrahdale Mine decommissioned and rehabilitated 2002 Completion criteria for ‘pre-1988’ rehabilitation approved 2005 First Certificate of Acceptance for 975ha of rehabilitation at Closed Jarrahdale Mine issued 2007 2nd revision of ‘post-1988’ rehabilitation completion criteria 2015 3rd revision of ‘post-1988’ rehabilitation completion criteria 2016 Current program of rehabilitation sign-off commenced 1998 2003 15/03/2018 9 Research has been integral to improving rehabilitation First experiments on topsoil double stripping and direct return Marrinup Nursery laboratory for tissue culture plants.
Field trials of propagated understorey species Topsoil screening and spreading technology Introduction of diverse understorey seed mix Fire research: integration of rehabilitation into prescribe burning plans 1966 1984 1988 1996 2006 2016 1975 1985 1994 2001 2012 First rehabilitation Development of winged tine for deep ripping Seed is smoke treated.
Target 100% species richness Improved fauna habitat CWD trials Direct seeding of jarrah and marri becomes operational Fertiliser rates reduced after trials show benefits for forest similarity 15/03/2018 10 Species Contribution Breakdown THE FRESH TOPSOIL REPRESENTS THE GREATEST CONTRIBUTION Nursery Hand seeding Fresh Topsoil Topsoil Overburden Pit Floor 20% 10% 70% 70% 100% 90% 80% 70% 60% 50% 40% 30% 20% 10% 0 15/03/2018 1 1 1984 2016 15/03/2018 12 Returning a self-sustaining jarrah forest ecosystem to enhance or maintain water, timber, recreation & conservation values Achieved100% plant species richness in rehabilitated areas and 100% marsupial, 89% reptile, 90% bird return rates Del Park1980 Del Park 2001 Del Park 2017 13