{"id":29599,"date":"2018-06-22T10:48:10","date_gmt":"2018-06-22T14:48:10","guid":{"rendered":"https:\/\/www.fondriest.com\/news\/?p=29599"},"modified":"2018-07-24T10:45:43","modified_gmt":"2018-07-24T14:45:43","slug":"mining-waste-cleanup-reveals-interesting-lake-dynamics","status":"publish","type":"post","link":"https:\/\/www.fondriest.com\/news\/mining-waste-cleanup-reveals-interesting-lake-dynamics.htm","title":{"rendered":"Mining Waste Cleanup Reveals Interesting Lake Dynamics"},"content":{"rendered":"<p><span style=\"font-weight: 400;\">For the past decade or so, <\/span><a href=\"https:\/\/www.civil.ubc.ca\/faculty\/bernard-laval\"><span style=\"font-weight: 400;\">Dr. Bernard Laval<\/span><\/a><span style=\"font-weight: 400;\">, a civil engineer with the <\/span><a href=\"https:\/\/www.civil.ubc.ca\/faculty\/bernard-laval\"><span style=\"font-weight: 400;\">University of BC<\/span><\/a><span style=\"font-weight: 400;\"> in Canada, has been researching <\/span><a href=\"https:\/\/www.travel-british-columbia.com\/cariboo-chilcotin\/cariboo\/quesnel-lake\/\"><span style=\"font-weight: 400;\">Quesnel Lake<\/span><\/a><span style=\"font-weight: 400;\">, a large, deep lake with unusual water dynamics. This allowed him an unusually high level of insight into much of what makes the lake tick\u2014and when <\/span><a href=\"https:\/\/www.imperialmetals.com\/our-operations\/mount-polley-mine\/overview\"><span style=\"font-weight: 400;\">Mount Polley Mine (MPM)<\/span><\/a><span style=\"font-weight: 400;\"> experienced a breach in 2014, causing materials to be deposited into Quesnel Lake, he already had a sense of what the lake&#8217;s waters looked like.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u201cOur work was inspired by a desire to improve holistic understanding of lake function to help with fisheries management by BC Ministry of Environment (BC MOE) and <\/span><a href=\"https:\/\/www.canada.ca\/en\/fisheries-oceans.html\"><span style=\"font-weight: 400;\">Fisheries and Ocean Canada<\/span><\/a><span style=\"font-weight: 400;\"> (DFO),\u201d explains Dr. Laval. \u201cI was invited to join by <\/span><a href=\"https:\/\/profils-profiles.science.gc.ca\/en\/profile\/eddy-carmack\"><span style=\"font-weight: 400;\">Eddy Carmack<\/span><\/a><span style=\"font-weight: 400;\">, a recently retired DFO scientist with a passion for lakes\u2014he formerly worked for Environment Canada when they had a western lakes division. He was intrigued by this large, deep lake whose outflow, the Quesnel River, had large temperature fluctuations (several degrees over days) during summer. This observation was the toe-hold that started the study into how the lake functions as a whole.\u201d<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Although Quesnel Lake had been monitored for decades due to its high fisheries value, scientists have historically only studied the top portions of the lake where sunlight penetrates the water. This is because most of the lake&#8217;s life is within this region of the water.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u201cStandard sampling only went down to 75m depth,\u201d comments Dr. Laval. \u201cEddy [Carmack] first had the lake re-surveyed, since old survey equipment only went down to 150m, and most lake maps are still based on these old surveys. They found it is over 500m deep, making it the second deepest lake in Canada. So very little was known about much of this lake.\u201d<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Dr. Laval and the others went to work. By 2008, Laval published the first new paper on the lake.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u201cThe 2008 paper showed that the temperature variations in the Quesnel River are related to motions in the lake set up by wind friction on the lake surface moving water,\u201d details Dr. Laval. \u201cEssentially the warm water at the lake surface is dragged downwind, which happens to be away from the outlet to the Quesnel River, and cold water comes up at the upwind end, which introduces colder water into the river.\u201d<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The team continued with their research, and by 2012 they had deciphered many of the circulatory patterns within the lake.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u201cThe 2012 paper tells the story of whole lake circulation, or how water in different regions of the lake interact with each other,\u201d Dr. Laval describes. \u201cPart of that is showing where river water goes when it enters the lake. Another part of that is describing seasonal mixing from top to bottom within the lake, which is how nutrients are recycled from the deep water back to the surface where they are available for the \u201clife\u201d the fisheries scientists are focused on. Because of Quesnel Lake\u2019s great depth and resulting high pressures, 50 atmospheres at the bottom, this vertical cycling of water is somewhat exotic and not what you find in your lake textbooks.\u201d<\/span><\/p>\n<h3><span style=\"color: #808080;\">The mine waste breach<\/span><\/h3>\n<p><span style=\"font-weight: 400;\">This past March, Dr. Laval<\/span><a href=\"https:\/\/video.unbc.ca\/media\/Impact+of+a+mine+tailings+impoundment+spill+on+Quesnel+Lake,+British+Columbia,+Canada.+Dr.+Bernard+Laval,+UBC+-+March+16+2018\/0_hkrlhtlz\/19801\"> <span style=\"font-weight: 400;\">presented recent findings<\/span><\/a><span style=\"font-weight: 400;\"> about Quesnel Lake&#8217;s progress since the breach. The presentation revealed that the lake&#8217;s ecosystem has slowly been flushing deposited materials out over time.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The 2014 breach released mine waste, which is the mined rock without the extracted metals. Miners crush the ore into a \u201crock flour\u201d to extract the metals, leaving tailings that were stored in water behind a dam.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u201cWhen the MPM tailings dam failed, water and tailings were released into nearby Polley Lake, and they then flowed 8km down Hazeltine Creek to Quesnel Lake,\u201d states Dr. Laval. \u201cWhat entered Quesnel Lake was a mixture of water, tailings, and both the forest and forest floor scoured by the debris flow.\u201d<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The elements of this mixture did different things upon entering the lake.<\/span><\/p>\n<p><div id=\"attachment_29572\" style=\"width: 610px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-29572\" class=\"size-large wp-image-29572\" src=\"https:\/\/www.fondriest.com\/news\/wp-content\/uploads\/2018\/06\/EDIT_mining_waste_VERTICAL-600x800.jpg\" alt=\"Mining Waste Cleanup\" width=\"600\" height=\"800\" srcset=\"https:\/\/news.fondriest.com\/wp-content\/uploads\/2018\/06\/EDIT_mining_waste_VERTICAL-600x800.jpg 600w, https:\/\/news.fondriest.com\/wp-content\/uploads\/2018\/06\/EDIT_mining_waste_VERTICAL-225x300.jpg 225w, https:\/\/news.fondriest.com\/wp-content\/uploads\/2018\/06\/EDIT_mining_waste_VERTICAL.jpg 648w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><p id=\"caption-attachment-29572\" class=\"wp-caption-text\"><span style=\"color: #808080;\"><strong>Top Image:<\/strong> Mount Polley Mine site in British Columbia on July 24, 2014 prior to the dam breach on August 4, 2014. Credit: By Jesse Allen, using Landsat data from the U.S. Geological Survey. (Caption by Adam Voiland. (Visible Earth, NASA) [Public domain], via Wikimedia Commons)\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0<\/span><br \/><span style=\"color: #808080;\"><strong>Bottom Image:<\/strong> Mount Polley Mine site in British Columbia on July 24, 2014 prior to the dam breach on August 4, 2014. (Credit: By Jesse Allen, using Landsat data from the U.S. Geological Survey. Caption by Adam Voiland. (Visible Earth, NASA) [Public domain], via Wikimedia Commons)<\/span><\/p><\/div><span style=\"font-weight: 400;\">\u201cThe trees floated, the larger particles went to the bottom as a slurry, and a bunch of very small particles (~1 micron) ended up suspended in the lake throughout the deep water of the West Basin (the lake has two basins),\u201d explains Dr. Laval. \u201cThe West Basin is the smaller basin to the west of Cariboo Island, from which the Quesnel River flows. This basin is about 100m deep. The material that entered due to the breach raised the lakebed 5 to 10 meters in the West Basin.\u201d<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The most dramatic changes to the lake came within four months of the breach. Now, Dr. Laval reports, materials have settled to the bottom of the lake and are slowly being flushed out.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u201cThe material initially suspended in the water column slowly settled to the bottom, the largest particles fastest, so that turbidity decreased, until the annual vertical mixing event mixed deep with surface waters and the Western Basin and Quesnel River turned green as a result,\u201d states Dr. Laval. \u201cThis all flushed out during spring freshet. Since then, every Fall we have observed turbidity increasing in the deep waters of the West Basin of Quesnel Lake, which is flushed during the subsequent freshet. A hypothesis we are testing is, is this annual increase of turbidity due to settled particles being resuspended from the lakebed? If this is true, which is still to be determined, then the next question to answer is how much of the 5 to 10 meters of material on the bottom is suspendable?\u201d<\/span><\/p>\n<p><span style=\"font-weight: 400;\">While the fluid dynamics of this lake are unusual, not everything about the mining breach story hinges upon those differences. For example, the mechanics of deep water renewal from 500 meters are unusual, but Dr. Laval points out that they don\u2019t really figure into the Mt. Polley spill story. However, other strange traits of Quesnel Lake appear to be playing into how the recovery from the breach proceeds.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u201cThe large temperature variations in the Quesnel River due to wind-induced lake motions are also unusual,\u201d remarks Dr. Laval. \u201cWind does this to all lakes, but you don\u2019t usually see deep water coming to the surface in summer when the temperature difference between surface and deep waters is greatest and the largest buoyancy difference exists; mechanically the wind has to impose a large enough friction force to overcome the gravitational effects on buoyancy.\u201d<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Dr. Laval explains that this plays into the Mt. Polley story because those same wind-induced motions move water between the West Basin and the main basin of Quesnel Lake. Other remaining questions center upon how much of the spill material is moving westward across the constriction separating the two basins, and what the long-term impacts of this material to the larger portion of the lake might be.<\/span><\/p>\n<p><em><span style=\"color: #808080;\">Top image: The Lavender Pit, an open pit copper mine, in Bisbee, Arizona. (Credit: By The original uploader was Cornellrockey at English Wikipedia. (Transferred from en.wikipedia to Commons.) [CC BY-SA 2.5 (https:\/\/creativecommons.org\/licenses\/by-sa\/2.5)], via Wikimedia Commons)<\/span><\/em><\/p>\n","protected":false},"excerpt":{"rendered":"<p>As scientists monitor a mining waste cleanup in a deep lake with unusual water dynamics, they learn more about how these dynamics impact remediation efforts.<\/p>\n","protected":false},"author":31,"featured_media":29569,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[32,7,8,49,510],"tags":[730,60,726,729,103,109,669,725,727,137,728,724],"class_list":["post-29599","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-lakes-reservoirs","category-news","category-newsfeed","category-rivers-streams","category-water-quality","tag-bc-ministry-of-environment-bc-moe","tag-featured","tag-mining-waste","tag-mount-polley-mine-mpm","tag-news-2","tag-news-ticker","tag-nutrients","tag-quesnel-lake","tag-quesnel-river","tag-sediment","tag-tailings","tag-university-of-northern-bc"],"remote_post_permalink":false,"remote_post_featured_image":false,"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Mining Waste Cleanup Reveals Interesting Lake Dynamics<\/title>\n<meta name=\"description\" content=\"As scientists monitor a mining waste cleanup in a deep lake with unusual water dynamics, they learn more about how these dynamics impact remediation efforts.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.fondriest.com\/news\/mining-waste-cleanup-reveals-interesting-lake-dynamics.htm\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Mining Waste Cleanup Reveals Interesting Lake Dynamics\" \/>\n<meta property=\"og:description\" content=\"As scientists monitor a mining waste cleanup in a deep lake with unusual water dynamics, they learn more about how these dynamics impact remediation efforts.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.fondriest.com\/news\/mining-waste-cleanup-reveals-interesting-lake-dynamics.htm\" \/>\n<meta property=\"og:site_name\" content=\"Environmental Monitor\" \/>\n<meta property=\"article:published_time\" content=\"2018-06-22T14:48:10+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2018-07-24T14:45:43+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.fondriest.com\/news\/wp-content\/uploads\/2018\/06\/EDITmining_waste_open_pit.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"480\" \/>\n\t<meta property=\"og:image:height\" content=\"640\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Karla Lant\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Karla Lant\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"6 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.fondriest.com\\\/news\\\/mining-waste-cleanup-reveals-interesting-lake-dynamics.htm#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.fondriest.com\\\/news\\\/mining-waste-cleanup-reveals-interesting-lake-dynamics.htm\"},\"author\":{\"name\":\"Karla Lant\",\"@id\":\"https:\\\/\\\/www.fondriest.com\\\/news\\\/#\\\/schema\\\/person\\\/51170f7bfa3a05b94cea6f517ce4e79b\"},\"headline\":\"Mining Waste Cleanup Reveals Interesting Lake Dynamics\",\"datePublished\":\"2018-06-22T14:48:10+00:00\",\"dateModified\":\"2018-07-24T14:45:43+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.fondriest.com\\\/news\\\/mining-waste-cleanup-reveals-interesting-lake-dynamics.htm\"},\"wordCount\":1250,\"commentCount\":1,\"image\":{\"@id\":\"https:\\\/\\\/www.fondriest.com\\\/news\\\/mining-waste-cleanup-reveals-interesting-lake-dynamics.htm#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/news.fondriest.com\\\/wp-content\\\/uploads\\\/2018\\\/06\\\/EDITmining_waste_open_pit.jpg\",\"keywords\":[\"BC Ministry of Environment (BC MOE)\",\"featured\",\"mining waste\",\"Mount Polley Mine (MPM)\",\"news\",\"news ticker\",\"nutrients\",\"Quesnel Lake\",\"Quesnel River\",\"sediment\",\"tailings\",\"University of Northern BC\"],\"articleSection\":[\"Lakes &amp; 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