{"id":569,"date":"2014-04-22T22:01:05","date_gmt":"2014-04-22T19:01:05","guid":{"rendered":"http:\/\/www.energy-sciences.org\/energy\/2014\/04\/22\/le-canada-gros-producteur\/"},"modified":"2014-04-22T22:01:05","modified_gmt":"2014-04-22T19:01:05","slug":"le-canada-gros-producteur","status":"publish","type":"post","link":"https:\/\/www.energy-sciences.org\/sciences\/le-canada-gros-producteur\/","title":{"rendered":"Le Canada, gros producteur"},"content":{"rendered":"<p class=\"bodytext\"><strong>En 2001, le Canada est demeur\u00e9 au premier rang des producteurs d&rsquo;<span class=\"definition glossaire xt-\u00adclick\">uranium<\/span>, car sa production annuelle, \u00e9valu\u00e9e \u00e0 environ 600 millions de dollars, atteint le niveau record de 12.522 tonnes d&rsquo;uranium m\u00e9tallique.<\/strong><\/p>\n<p class=\"bodytext\" style=\"text-align: justify;\">Au Canada, les ressources r\u00e9cup\u00e9rables connues totalisent 452.000 tonnes en 2002. \u00c0 l&rsquo;avenir, le Canada conservera le premier rang, car 85 % de ses ressources sont exploitables \u00e0 co\u00fbt modique.<\/p>\n<p class=\"bodytext\">La demande d&rsquo;uranium a augment\u00e9 en raison :<\/p>\n<ul>\n<li>de la demande en Asie ;<\/li>\n<li>de l&rsquo;am\u00e9lioration de l&rsquo;exploitation des centrales \u00e0 travers le monde ;<\/li>\n<li>du prolongement de la dur\u00e9e d&rsquo;exploitation des r\u00e9acteurs.<\/li>\n<\/ul>\n<p class=\"fs-media\" style=\"text-align: center;\"><img fetchpriority=\"high\" decoding=\"async\" class=\" fs-txdam-50062751 diaporama-trigger\" src=\"http:\/\/fr.cdn.v5.futura-sciences.com\/sources\/images\/dossier\/rte\/magic\/4304_uranium_051.jpg\" border=\"0\" alt=\"La pechblende, dont voici un \u00e9chantillon en provenance de la mine de Payne, au Qu\u00e9bec, est un min\u00e9ral \u00e0 partir duquel on produit l\u2019uranium.\" title=\"La pechblende, dont voici un \u00e9chantillon en provenance de la mine de Payne, au Qu\u00e9bec, est un min\u00e9ral \u00e0 partir duquel on produit l\u2019uranium.\" width=\"280\" height=\"280\" style=\"display: block; margin-left: auto; margin-right: auto;\" data-htmlarea-clickenlarge=\"1\" \/><br \/>La pechblende, dont voici un \u00e9chantillon en provenance de la mine de Payne, au Qu\u00e9bec, est un min\u00e9ral \u00e0 partir duquel on produit l\u2019uranium. \u00a9 Mus\u00e9e national des sciences naturelles<\/p>\n<p class=\"bodytext\" style=\"text-align: justify;\">Le Canada produit 30 % de l&rsquo;uranium mondial et exporte 80 % de sa production. Pour suivre le rythme, il acc\u00e9l\u00e8re la production dans les mines existantes, met en valeur des <span class=\"definition glossaire xt-\u00adclick\">gisements<\/span> plus petits et d\u00e9j\u00e0 connus et prospecte de nouveaux gisements. Rassemblant la moiti\u00e9 des r\u00e9serves et de la production d\u2019uranium du monde, l\u2019Australie et le Canada reconnaissent que l\u2019\u00e9nergie nucl\u00e9aire peut aider \u00e0 relever le d\u00e9fi pos\u00e9 par les changements climatiques.<\/p>\n<p class=\"fs-media\" style=\"text-align: center;\"><img decoding=\"async\" class=\" fs-txdam-50062752 diaporama-trigger\" src=\"http:\/\/fr.cdn.v5.futura-sciences.com\/sources\/images\/dossier\/rte\/magic\/4304_uranium_052.jpg\" border=\"0\" alt=\"Carte de l'uranium au Canada. Les mines en activit\u00e9 sont marqu\u00e9es d\u2019un rond, celles qui ont \u00e9t\u00e9 ferm\u00e9es d\u2019un carr\u00e9 et les sites potentiels d\u2019un triangle. Les \u00e9toiles figurent les sites de raffinage en activit\u00e9.\" title=\"Carte de l'uranium au Canada. Les mines en activit\u00e9 sont marqu\u00e9es d\u2019un rond, celles qui ont \u00e9t\u00e9 ferm\u00e9es d\u2019un carr\u00e9 et les sites potentiels d\u2019un triangle. Les \u00e9toiles figurent les sites de raffinage en activit\u00e9.\" width=\"450\" height=\"295\" style=\"display: block; margin-left: auto; margin-right: auto;\" data-htmlarea-clickenlarge=\"1\" \/><br \/>Carte de l&rsquo;uranium au Canada. Les mines en activit\u00e9 sont marqu\u00e9es d\u2019un rond, celles qui ont \u00e9t\u00e9 ferm\u00e9es d\u2019un carr\u00e9 et les sites potentiels d\u2019un triangle. Les \u00e9toiles figurent les sites de raffinage en activit\u00e9. \u00a9 DR<\/p>\n<h2><strong>Le bassin de l\u2019Athabasca au Saskatchewan<\/strong><\/h2>\n<p class=\"bodytext\" style=\"text-align: justify;\">Toutes les mines d\u2019uranium exploit\u00e9es au Canada sont situ\u00e9es au Saskatchewan. La mine de McArthur River y a des teneurs de 19 \u00e0 25 %. Elle renferme plus de 150.000 tonnes d\u2019uranium titrant en moyenne 18 %. Elle est \u00e0 550 m\u00e8tres sous <span class=\"definition glossaire xt-\u00adclick\">terre<\/span>, perdue dans les for\u00eats du nord-ouest, et on y acc\u00e8de par <span class=\"definition glossaire xt-\u00adclick\">avion<\/span> charter et une heure de pistes. C\u2019est la plus importante mine d\u2019uranium \u00e0 haute teneur au monde, et sa puret\u00e9 est de 21 % d\u2019uranium, soit 100 fois la teneur moyenne mondiale, avec certains morceaux qui d\u00e9passent 60 % de puret\u00e9.<\/p>\n<p class=\"fs-media\" style=\"text-align: center;\"><img decoding=\"async\" class=\" fs-txdam-50100459 diaporama-trigger\" src=\"http:\/\/fr.cdn.v5.futura-sciences.com\/builds\/images\/rte\/RTEmagicC_4304_uranium_053_txdam50100459_9dd4e4.jpg\" border=\"0\" alt=\"G\u00e9ologie du bassin de l\u2019Athabasca. Les filons majeurs d\u2019uranium sont situ\u00e9s sur les carr\u00e9s rouges, et les campagnes de prospection sur les ronds de m\u00eame couleur.\" title=\"G\u00e9ologie du bassin de l\u2019Athabasca. Les filons majeurs d\u2019uranium sont situ\u00e9s sur les carr\u00e9s rouges, et les campagnes de prospection sur les ronds de m\u00eame couleur.\" width=\"448\" height=\"350\" style=\"display: block; margin-left: auto; margin-right: auto;\" data-htmlarea-clickenlarge=\"1\" \/><br \/>G\u00e9ologie du bassin de l\u2019Athabasca. Les filons majeurs d\u2019uranium sont situ\u00e9s sur les carr\u00e9s rouges, et les campagnes de prospection sur les ronds de m\u00eame couleur. \u00a9 DR<\/p>\n<p class=\"bodytext\" style=\"text-align: justify;\">Cigar Lake, un autre gisement, renferme 135.000 tonnes d\u2019uranium pur (soit environ 90.000 tonnes titrant en moyenne 15 % d&rsquo;uranium), dans un bloc de 50 m\u00e8tres sur 300, \u00e0 500 m de profondeur. Mais une <span class=\"definition glossaire xt-\u00adclick\">inondation<\/span> y est survenue en 2006 qui a pouss\u00e9 \u00e0 la hausse les prix du march\u00e9 mondial. Le co\u00fbt de l\u2019accident est estim\u00e9 \u00e0 un milliard de dollars, et les r\u00e9parations ont pris des ann\u00e9es.<\/p>\n<h2><strong>Remise en \u00e9tat de la mine de Cigar Lake<\/strong><\/h2>\n<p class=\"bodytext\" style=\"text-align: justify;\">La soci\u00e9t\u00e9 Cameco, dont le si\u00e8ge est \u00e0 Saskatoon, est le plus important producteur d&rsquo;uranium au monde. Les actions de Cameco se n\u00e9gocient aux bourses de Toronto et de New York. L\u2019entreprise a proc\u00e9d\u00e9 \u00e0 la remise en \u00e9tat de la mine de Cigar Lake \u00e0 la suite d&rsquo;une venue d&rsquo;eau survenue le 23 octobre 2006, qui a inond\u00e9 les ouvrages souterrains. Cet \u00e9v\u00e9nement aurait \u00e9t\u00e9 l\u2019une des causes de l\u2019envol\u00e9e des prix de l\u2019uranium en 2007.<\/p>\n<p class=\"fs-media\" style=\"text-align: center;\"><img loading=\"lazy\" decoding=\"async\" class=\" fs-txdam-50062754 diaporama-trigger\" src=\"http:\/\/fr.cdn.v5.futura-sciences.com\/sources\/images\/dossier\/rte\/magic\/4304_uranium_054.jpg\" border=\"0\" alt=\"Chantier de la mine de Cigar Lake, au Canada.\" title=\"Chantier de la mine de Cigar Lake, au Canada.\" width=\"400\" height=\"333\" style=\"display: block; margin-left: auto; margin-right: auto;\" data-htmlarea-clickenlarge=\"1\" \/><br \/>Chantier de la mine de Cigar Lake, au Canada. \u00a9 DR<\/p>\n<p class=\"bodytext\" style=\"text-align: justify;\">La premi\u00e8re \u00e9tape comportait le forage de trous jusqu&rsquo;\u00e0 la venue d&rsquo;eau, le pompage de <span class=\"definition glossaire xt-\u00adclick\">b\u00e9ton<\/span> par les trous de forage, l&rsquo;\u00e9tanch\u00e9ification de la zone d&rsquo;infiltration et le forage de trous d&rsquo;\u00e9vacuation de l&rsquo;eau. Les \u00e9tapes ult\u00e9rieures comportaient l&rsquo;\u00e9vacuation de l&rsquo;eau, la cong\u00e9lation du sol dans le secteur de l&rsquo;infiltration d&rsquo;eau, la remise en \u00e9tat des secteurs souterrains et la reprise du d\u00e9veloppement minier.<\/p>\n<p class=\"bodytext\" style=\"text-align: justify;\">En 2008, la mine a subi une nouvelle inondation, alors m\u00eame qu\u2019elle \u00e9tait en cours d\u2019ass\u00e8chement. Ce n&rsquo;est qu&rsquo;en 2010 que les travaux pour am\u00e9nager la mine ont pu reprendre. Ainsi, l&rsquo;ouverture de l&rsquo;exploitation de la mine de Cigar Lake a \u00e9t\u00e9 r\u00e9guli\u00e8rement report\u00e9e, en 2011, 2013 et finalement 2014. 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