Tailings Dams, Failures, and the proposed Casino Mine. February 23 rd, 2016 Hellaby Hall Presentation
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1 Tailings Dams, Failures, and the proposed Casino Mine February 23 rd, 2016 Hellaby Hall Presentation
2 Topics to be covered Yukon Conservation Society Overburden and Waste Rock Tailings Dry and Wet Acid Rock Drainage Historical Yukon Tailings Faro Current Yukon Tailings Tailings Dam Failures Future Tailings Dams Casino Conclusion
3 Yukon Conservation Society Established in 1968 because of the concerns raised by the impacts of the 1960s mining boom To pursue ecosystem well-being throughout the Yukon and beyond, recognizing that human wellbeing is ultimately dependent upon fully functioning healthy ecosystems. That mining in the Yukon occurs only in places where such activities are ecologically and culturally acceptable.
4 Problems with Mining Surface Disturbances Contaminants
5 Placer Hard Rock Problems Hard Rock
6 Overburden and Waste Rock These are mining words do not reflect the values we place on surface ecosystems Overburden - materials overlying an ore or mineral body that are displaced during mining without being processed. They are typically shoveled to one side. Sometimes they are placed behind a dam type control structure. Waste Rock rock that is removed but does not have mineral potential. It can be used to build infrastructure and roads.
7 Acid Rock Drainage Acid rock drainage (ARD) or acid mine drainage (AMD): acidic water that is created when sulphide minerals are exposed to air and water and produce sulphuric acid. Acid breaks down rock, which in turn releases other metals into the environment. Photo Credit - Canadian Geoscience Education Network
8 Waste Rock Issues Clinton Creek Photo credit
9 What Are Tailings? Tailings the mud or powder which is left over after ore is crushed, processed, and metals extracted Tailings come from hardrock mining they tend not to be created by placer mining Wet or Dry Tailings - typically either classified as wet or dry (but are really a combo) Paste Tailings thickener added to wet tailings, used as backfill in underground shafts
10 Dry Tailings Dry Tailings water is mostly extracted, either mechanically or allowed to drain out Can be mounded, or stored behind a dam There are still environmental concerns Whitehorse Copper, Photo Credit Lewis Rifkind
11 Current Yukon Dry Tailings Minto Mine has a drystack tailings pile Starting to move but there is a plan Note: company is paying for stabilization Photo Credits YCS Airforce and LightHawk.org
12 Wet Tailings Wet Tailings less expensive up front, but expensive afterwards. Must be maintained. Faro Mine Photo Credits
13 Faro Tailings Dams Current information on this site is limited Photo Credits YCS Airforce and LightHawk.org
14 Other Wet Tailings Wolverine Mine Tailings Facility Photo credit Keno Tailings Pond Photo credit
15 Historical Yukon Tailings Wolverine (bankrupt) Ketza River (abandoned) Clinton Creek (abandoned) Keno (abandoned) Faro (abandoned) Whitehorse Copper Mt Nansen (abandoned) Sa Dena Hess Tulsequah Chief Tungsten Mine (abandoned) Map: (but edited by YCS)
16 Paying For It Faro 70 million tonnes of tailings and 320 million tonnes of waste rock located across the mine complex estimated 400 years to remediate costing $1 billion Mt Nansen: $23 million Keno: unknown Clinton Creek: unknown Privatizing the profit but socializing the risk
17 Tailings Dam Failures Mt Polley tailings dam failure photo credit Spanish Tailings Dam failure, 1998 Photo credit Hungarian Tailings Dam failure, 2010 photo credit Der Standard
18 Yukon Tailings Failures Faro, 1975 Mt Polley,2014 Faro Mine tailings spill 1975 Photo credits CBC and unknown Faro Mine tailings spill 1975 Photo Credit - various
19 What is Casino?
20 What is Casino? Photo Credit Photo Credits Western Copper and Gold
21 Casino Overview Casino Mine Project YESAB Adequacy Review Report Backgrounder
22 Casino Has Some Issues Design: Guin Lalena
23 Greenhouse Gases Source: Environment Canada
24 Klaza Caribou Range Screenshot from Casino site animation video - Western Copper and Gold Klaza Caribou Herd -
25 Casino Tailings Dams
26 Casino Facts Will store 947 million tonnes of tailings produced by the processing plant, and 658 million tonnes of potentially reactive waste rock generated through mining The earth-fill dam would be one of the world's highest dams, and possibly the highest tailings dam. An on-site LNG power plant will be used to generate the needed 150 megawatts of power for mine operations Freshwater will be supplied from the Yukon River, via a 17-km long pipeline with four booster stations at a rate of 3,400 m3/hr.
27 Casino Watershed mages/aquatic_rsa_1may jpg
28 YESAB Panel Review
29 Other Tailings Dams Photo credit Selwyn Chihong Photo Credit Cathy Archbould Photo credit cbc.ca Photo credit Wellgreen Platinum
30 Moving Forward A future without tailings dams. That means a future of dry stack tailings. Which means a future without Casino (as currently envisioned).
31 Remediation and Closure Options Every mine site should have closure options that do not include tailings dams Brewery Creek Photo credit -
32 What You Can Do! Submit written comments against the Casino tailings dam when it goes to public comments at YESAB Go to and look for Project Number: , Casino Mine Project Encourage the mining industry to look to alternatives to wet tailings dams Support the Yukon Conservation Society: for more information, to volunteer, to become a member Follow us on
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