{"id":8271,"date":"2012-07-02T10:03:47","date_gmt":"2012-07-02T08:03:47","guid":{"rendered":"https:\/\/www.gold.fr\/news\/?p=8271"},"modified":"2019-08-02T10:48:01","modified_gmt":"2019-08-02T08:48:01","slug":"exploitation-de-lor","status":"publish","type":"post","link":"https:\/\/www.gold.fr\/news\/2012\/07\/02\/exploitation-de-lor\/","title":{"rendered":"Orpaillage : le Placer"},"content":{"rendered":"<p><span style=\"font-size: small;\"><img loading=\"lazy\" decoding=\"async\" class=\"alignleft size-thumbnail wp-image-2903\" style=\"float: left; margin: 5px; border: 1px solid black;\" title=\"P\u00e9pite or\" src=\"https:\/\/www.gold.fr\/news\/wp-content\/uploads\/2011\/10\/Or-p\u00e9pite-150x150.jpg\" alt=\"\" width=\"150\" height=\"150\" \/>Un placer alluvial se caract\u00e9rise par l&rsquo;existence d&rsquo;un cours d&rsquo;eau qui a la facult\u00e9 de produire des d\u00e9p\u00f4ts d&rsquo;alluvions qui pr\u00e9sentent localement des concentrations naturelles \u00e9lev\u00e9es en min\u00e9raux lourds. Ces d\u00e9p\u00f4ts se font sous forme de sables pouvant prendre la forme de d\u00e9bris fins, de paillettes, de grains ou de p\u00e9pites. <\/span> <span style=\"font-size: small;\">Ces sables sont caract\u00e9ris\u00e9s par leur composition \u00e0 base de min\u00e9raux \u00e0 forte densit\u00e9 ; <strong>m\u00e9taux<\/strong> (<a class=\"esk-seo-plu-link\" href=\"https:\/\/www.gold.fr\/news\/tags\/or\">or<\/a> notamment), cristaux lourds, mais \u00e9galement des produit beaucoup moins nobles tels que le <strong>plomb<\/strong> et les <strong>d\u00e9bris m\u00e9talliques<\/strong>. Tr\u00e8s souvent les d\u00e9p\u00f4ts primaires s&rsquo;\u00e9tiolent et disparaissent. La derni\u00e8re source de l&rsquo;<a class=\"esk-seo-plu-link\" href=\"https:\/\/www.gold.fr\/news\/tags\/or\">or<\/a> demeure le ruissellement des particules sur des pal\u00e9o-placers dispers\u00e9s dans les conglom\u00e9rats, l&rsquo;argile ou dans un ancien lit de cours d&rsquo;eau. De plus, il faut pr\u00e9ciser que les d\u00e9p\u00f4ts de min\u00e9raux notamment l&rsquo;<a class=\"esk-seo-plu-link\" href=\"https:\/\/www.gold.fr\/news\/tags\/or\">or<\/a> ne circulent pas al\u00e9atoirement sur toute la largeur du lit.<\/span> <span style=\"font-size: small;\">G\u00e9n\u00e9ralement, <strong>ils cheminent dans un canal \u00e9troit d\u00e9nomm\u00e9 \u00ab Gold Line \u00bb<\/strong> qui suit la corde du cours d&rsquo;eau. Ainsi, le trajet du \u00ab gold line \u00bb est variable et d\u00e9pend essentiellement du d\u00e9bit et de la g\u00e9om\u00e9trie du cours d&rsquo;eau. On peut trouver l&rsquo;<a class=\"esk-seo-plu-link\" href=\"https:\/\/www.gold.fr\/news\/tags\/or\">or<\/a> dans des plages de graviers sous forme de particules dans un m\u00e9lange constitu\u00e9 de sable et de gravier. On peut \u00e9galement trouver de l&rsquo;<a class=\"esk-seo-plu-link\" href=\"https:\/\/www.gold.fr\/news\/tags\/or\">or<\/a> dans anfractuosit\u00e9s creus\u00e9es dans la roche appel\u00e9es marmites et qui se trouvent au fond du lit de la rivi\u00e8re.<\/span> <span style=\"font-size: small;\">Ces marmites ont la particularit\u00e9 d&rsquo;\u00eatre tr\u00e8s riches en <a class=\"esk-seo-plu-link\" href=\"https:\/\/www.gold.fr\/news\/tags\/or\">or<\/a>. Effectivement la teneur peut monter jusqu&rsquo;\u00e0 500 grammes par m\u00e8tre cube de graviers sur quelques litres.<\/span> <span style=\"font-size: small;\">L&rsquo;exploitation de ces placers \u00e9tait tr\u00e8s rudimentaire \u00e0 l&rsquo;\u00e9poque au Far West. En effet, les premiers chercheurs \u00e9taient munis d&rsquo;une simple b\u00eache et d&rsquo;un r\u00e9cipient en m\u00e9tal appel\u00e9 \u00ab <a title=\"Activit\u00e9 d'Orpaillage\" href=\"https:\/\/www.gold.fr\/news\/2012\/06\/18\/lactivite-dorpaillage\/8109\/\" target=\"_blank\" rel=\"noopener noreferrer\">bat\u00e9e<\/a> \u00bb. Le sable \u00e9tait lav\u00e9 dans un r\u00e9cipient en impr\u00e9gnant un mouvement circulaire afin que les s\u00e9diments les plus l\u00e9gers soient expuls\u00e9s dans l&rsquo;eau de la rivi\u00e8re. Ainsi, il ne restait plus que le sable et l&rsquo;<a class=\"esk-seo-plu-link\" href=\"https:\/\/www.gold.fr\/news\/tags\/or\">or<\/a>.<\/span> <span style=\"font-size: small;\">Cette technique archa\u00efque avait \u00e9t\u00e9 d\u00e9velopp\u00e9e avec une sorte de longue caisse en bois dans laquelle l&rsquo;eau s&rsquo;\u00e9coulait. Des taquets \u00e9taient plac\u00e9s pour pouvoir capturer les particules lourdes, le \u00ab<strong> long tom<\/strong> \u00bb.<\/span> <span style=\"font-size: small;\">Puis est apparu le \u00ab <strong>Sluice <\/strong>\u00bb qui consiste \u00e0 utiliser des couvertures en laine pour arr\u00eater les d\u00e9p\u00f4ts les plus fins. Enfin, le mercure a \u00e9t\u00e9 employ\u00e9 en bout de Sluice afin que l&rsquo;<a class=\"esk-seo-plu-link\" href=\"https:\/\/www.gold.fr\/news\/tags\/or\">or<\/a> s&rsquo;agglutine autour. <strong>1.3Kg de mercure permet d&rsquo;amalgamer 1 Kg d&rsquo;<a class=\"esk-seo-plu-link\" href=\"https:\/\/www.gold.fr\/news\/tags\/or\">or<\/a><\/strong>.<\/span> <span style=\"font-size: small;\">Les placers sont plus facilement exploitables par l&rsquo;utilisation de jets d&rsquo;eau \u00e0 forte pression permettant d&rsquo;ameublir les s\u00e9diments. La boue produite est ensuite pass\u00e9e sur les tables.<\/span><\/p>\n<!-- AddThis Advanced Settings generic via filter on the_content --><!-- AddThis Share Buttons generic via filter on the_content -->","protected":false},"excerpt":{"rendered":"<p>Un placer alluvial se caract\u00e9rise par l&rsquo;existence d&rsquo;un cours d&rsquo;eau qui a la facult\u00e9 de produire des d\u00e9p\u00f4ts d&rsquo;alluvions qui pr\u00e9sentent localement des concentrations naturelles \u00e9lev\u00e9es en min\u00e9raux lourds. Ces d\u00e9p\u00f4ts se font sous forme de [&hellip;]<\/p>\n","protected":false},"author":43,"featured_media":2903,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_mbp_gutenberg_autopost":false,"_pgmb_is_evergreen":false,"_pgmb_ap_template_id":0,"footnotes":""},"categories":[6],"tags":[620,76,596,619,618],"ppma_author":[2562],"class_list":["post-8271","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-articles-de-presse","tag-gold-line","tag-or","tag-orpaillage","tag-pepite-or","tag-placer"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Orpaillage : le Placer - Gold.fr<\/title>\n<meta name=\"description\" content=\"D\u00e9couvrez c&#039;est quoi un placer et suivez le cours de l&#039;or, de l&#039;argent et d&#039;autres m\u00e9taux pr\u00e9cieux sur Gold.fr. 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