{"id":41109,"date":"2022-06-09T07:34:48","date_gmt":"2022-06-09T07:34:48","guid":{"rendered":"https:\/\/blogs.agu.org\/landslideblog\/?p=41109"},"modified":"2022-06-09T07:34:48","modified_gmt":"2022-06-09T07:34:48","slug":"thetford-mines-landslide","status":"publish","type":"post","link":"https:\/\/blogs.agu.org\/landslideblog\/2022\/06\/09\/thetford-mines-landslide\/","title":{"rendered":"The Black Lake landslide at Thetford Mines in Quebec"},"content":{"rendered":"<h4>The Black Lake landslide at Thetford Mines in Quebec<\/h4>\n<p>In the last few days a video captured by a drone of the aftermath of the 2009 Black Lake rockslide at Thetford Mines in Quebec, <a href=\"https:\/\/blogs.agu.org\/landslideblog\/?s=canada&amp;submit.x=0&amp;submit.y=0&amp;mswhere=blog\">Canada<\/a>, has gone viral.\u00a0 The video was captured by <a href=\"https:\/\/www.youtube.com\/c\/Optiquevideo\">Optique video<\/a> in 2021, and a very dramatic backing track has been added.\u00a0 You should be able to view the footage below:-<\/p>\n<iframe loading=\"lazy\" title=\"FPV cinematic episode #5 - The disaster\" width=\"800\" height=\"450\" src=\"https:\/\/www.youtube.com\/embed\/b_pTjvzyeuI?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture\" allowfullscreen><\/iframe>\n<p>.<\/p>\n<p>This landslide is located at 46.026, -71.363, and is very clear on Google Earth:-<\/p>\n<div id=\"attachment_41112\" style=\"width: 810px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-41112\" class=\"wp-image-41112\" src=\"https:\/\/blogs.agu.org\/landslideblog\/files\/2022\/06\/22_06-Thetford-Mines-1.jpg\" alt=\"Google Earth image of the Black Lake landslide at Thetford Mines in Quebec, Canada.\" width=\"800\" height=\"568\" srcset=\"https:\/\/blogs.agu.org\/landslideblog\/files\/2022\/06\/22_06-Thetford-Mines-1.jpg 1246w, https:\/\/blogs.agu.org\/landslideblog\/files\/2022\/06\/22_06-Thetford-Mines-1-300x213.jpg 300w, https:\/\/blogs.agu.org\/landslideblog\/files\/2022\/06\/22_06-Thetford-Mines-1-1024x727.jpg 1024w, https:\/\/blogs.agu.org\/landslideblog\/files\/2022\/06\/22_06-Thetford-Mines-1-768x545.jpg 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><p id=\"caption-attachment-41112\" class=\"wp-caption-text\"><em>Google Earth image of the Black Lake landslide at Thetford Mines in Quebec, Canada.<\/em><\/p><\/div>\n<p>.<\/p>\n<p>The landslide destroyed a section of Route 112 in the area of the Lac d\u2019amiante asbestos (serpentinised peridotite) mine, which closed in 2011.\u00a0 The road was rerouted, with a new section opened in 2015.<\/p>\n<p>The development of the landslide is quite interesting.\u00a0 A Google Earth image from May 2009 shows the road in an intact state, but some of the benches below the highway in the pit wall had collapsed:-<\/p>\n<div id=\"attachment_41114\" style=\"width: 810px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-41114\" class=\"wp-image-41114\" src=\"https:\/\/blogs.agu.org\/landslideblog\/files\/2022\/06\/22_06-Thetford-Mines-2.jpg\" alt=\"Google Earth image from May 2009 showing the site of the Black Lake landslide at Thetford Mines in Quebec, Canada.\" width=\"800\" height=\"634\" srcset=\"https:\/\/blogs.agu.org\/landslideblog\/files\/2022\/06\/22_06-Thetford-Mines-2.jpg 1219w, https:\/\/blogs.agu.org\/landslideblog\/files\/2022\/06\/22_06-Thetford-Mines-2-300x238.jpg 300w, https:\/\/blogs.agu.org\/landslideblog\/files\/2022\/06\/22_06-Thetford-Mines-2-1024x811.jpg 1024w, https:\/\/blogs.agu.org\/landslideblog\/files\/2022\/06\/22_06-Thetford-Mines-2-768x609.jpg 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><p id=\"caption-attachment-41114\" class=\"wp-caption-text\"><em>Google Earth image from May 2009 showing the site of the Black Lake landslide at Thetford Mines in Quebec, Canada.<\/em><\/p><\/div>\n<p>.<\/p>\n<p>By January 2012 the slope failure had retrogressed and damage to the road was evident.\u00a0 In one location a section of the side of the road had collapsed, and in others large tension cracks had developed:-<\/p>\n<div id=\"attachment_41116\" style=\"width: 810px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-41116\" class=\"wp-image-41116\" src=\"https:\/\/blogs.agu.org\/landslideblog\/files\/2022\/06\/22_06-Thetford-Mines-3.jpg\" alt=\"Google Earth image from June 2012 showing the site of the Black Lake landslide at Thetford Mines in Quebec, Canada.\" width=\"800\" height=\"635\" srcset=\"https:\/\/blogs.agu.org\/landslideblog\/files\/2022\/06\/22_06-Thetford-Mines-3.jpg 1217w, https:\/\/blogs.agu.org\/landslideblog\/files\/2022\/06\/22_06-Thetford-Mines-3-300x238.jpg 300w, https:\/\/blogs.agu.org\/landslideblog\/files\/2022\/06\/22_06-Thetford-Mines-3-1024x813.jpg 1024w, https:\/\/blogs.agu.org\/landslideblog\/files\/2022\/06\/22_06-Thetford-Mines-3-768x610.jpg 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><p id=\"caption-attachment-41116\" class=\"wp-caption-text\">Google Earth image from June 2012 showing the site of the Black Lake landslide at Thetford Mines in Quebec, Canada.<\/p><\/div>\n<p>.<\/p>\n<p>The image from October 2016 shows that complete failure had occurred, whilst the mine was flooded at the end of operations:-<\/p>\n<div id=\"attachment_41118\" style=\"width: 810px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-41118\" class=\"wp-image-41118\" src=\"https:\/\/blogs.agu.org\/landslideblog\/files\/2022\/06\/22_06-Thetford-Mines-4.jpg\" alt=\"Google Earth image from August 2016 showing the fully developed Black Lake landslide at Thetford Mines in Quebec, Canada.\" width=\"800\" height=\"633\" srcset=\"https:\/\/blogs.agu.org\/landslideblog\/files\/2022\/06\/22_06-Thetford-Mines-4.jpg 1224w, https:\/\/blogs.agu.org\/landslideblog\/files\/2022\/06\/22_06-Thetford-Mines-4-300x237.jpg 300w, https:\/\/blogs.agu.org\/landslideblog\/files\/2022\/06\/22_06-Thetford-Mines-4-1024x810.jpg 1024w, https:\/\/blogs.agu.org\/landslideblog\/files\/2022\/06\/22_06-Thetford-Mines-4-768x607.jpg 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><p id=\"caption-attachment-41118\" class=\"wp-caption-text\">Google Earth image from August 2016 showing the fully developed Black Lake landslide at Thetford Mines in Quebec, Canada.<\/p><\/div>\n<p>.<\/p>\n<p>The Black Lake landslide is described in a paper (<a href=\"https:\/\/doi.org\/10.1139\/cgj-2017-0298\">Amoushahi <em>et al.<\/em> 2018<\/a>) published in the <a href=\"https:\/\/cdnsciencepub.com\/journal\/cgj\">Canadian Geotechnical Journal,<\/a> which analysed the stability of the slope.\u00a0 The study, and others, indicated that about 50 million cubic metres of rock slipped over a lateral extent of about 1,100 metres.\u00a0 Approximately 70 m of vertical movement was observed at the crown of the slope.<\/p>\n<p>.<\/p>\n<h4>Reference<\/h4>\n<p><span class=\"NLM_string-name\">Amoushahi<\/span>, S., <span class=\"NLM_string-name\">Grenon<\/span>, M., <span class=\"NLM_string-name\">Locat<\/span>, J. and <span class=\"NLM_string-name\">Turmel, D. 2018.<\/span>\u00a0<a href=\"https:\/\/doi.org\/10.1139\/cgj-2017-0298\">Deterministic and probabilistic stability analysis of a mining rock slope in the vicinity of a major public road \u2014 case study of the LAB Chrysotile mine in Canada<\/a>.\u00a0<i>Canadian Geotechnical Journal<\/i>.\u00a0<b>55 <\/b>(10): 1391-1404.\u00a0<a href=\"https:\/\/doi.org\/10.1139\/cgj-2017-0298\">https:\/\/doi.org\/10.1139\/cgj-2017-0298<\/a><\/p>\n<!-- AddThis Advanced Settings generic via filter on the_content --><!-- AddThis Share Buttons generic via 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--><\/p>\n","protected":false},"author":22,"featured_media":41112,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[29],"tags":[4,2349,469,963,299,205,725],"class_list":["post-41109","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-landslide-video","tag-canada","tag-drone","tag-featured","tag-landslide-video","tag-mine","tag-mining","tag-north-america"],"_links":{"self":[{"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/posts\/41109","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/users\/22"}],"replies":[{"embeddable":true,"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/comments?post=41109"}],"version-history":[{"count":0,"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/posts\/41109\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/media\/41112"}],"wp:attachment":[{"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/media?parent=41109"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/categories?post=41109"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/tags?post=41109"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}