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   Open-pit mining – General Overview    - Protect Ecuador - Southern Ecuador | Open-pit Mining | Mirador Project | Human rights | Nature's rights
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padding: 10px 10px 14px 22px;">An <strong> ore </strong> is a type of rock that contains minerals with important elements including metals. The ores are extracted through mining and then refined to extract the valuable element(s).</div></div></ul></div><script>/* <![CDATA[ */ jQuery(function($){ $('#slider_1035').slides({container: 'thumbnail-list-slider', preload: true, paginationClass: 'slides_pagination', effect: 'fade', generatePagination: false, autoHeight: true});});</script><p>In many cases, <strong> logging of trees and clear-cutting or burning of vegetation above the ore deposit may precede removal of the overburden </strong> . The use of heavy machinery, usually bulldozers and dump trucks, is the most common means of removing overburden. Open-pit mining often involves the removal of natively vegetated areas, and is</div><div class="grid_6 omega">therefore  <strong> among the most  </strong><strong> environmentally destructive types of mining, especially within tropical forests. </strong><p><div class=slides_container id=slider_5652><ul class="stripped thumbnail-list-slider clearfix"><li><div class="clearfix content"><div style="background: #9EE3E1; padding: 10px 10px 14px 22px;"><strong> Overburden </strong> (also called <em> waste </em> or <em> spoi </em> l) is the material that lies above an area with economic or scientific interest. In mining, it is most commonly the rock, soil, and ecosystem that lies above a coal seam or ore body. Overburden is removed during surface mining.</div></div></ul></div><script>/* <![CDATA[ */ jQuery(function($){ $('#slider_5652').slides({container: 'thumbnail-list-slider', preload: true, paginationClass: 'slides_pagination', effect: 'fade', generatePagination: false, autoHeight: true});});</script><p>Because open-pit mining is employed for ore deposits at a substantial depth underground, it usually involves the creation of a pit that extends below the groundwater table. In this case, groundwater must be pumped out of the pit to allow mining to take place. A pit lake usually forms at some point in time after mining stops and the groundwater pumps are turned off.</div><div class=clear></div><p><div class="wp-caption aligncenter"style="width: 1290px"id=attachment_456><a href=http://protectecuador.org/wp-content/uploads/2012/12/Corta-Atalaya.jpg> <img alt="Corta Atalaya is the largest open-pit mine in Europe."class="size-full wp-image-456"sizes="(max-width: 1280px) 100vw, 1280px"srcset="http://protectecuador.org/wp-content/uploads/2012/12/Corta-Atalaya.jpg 1280w, http://protectecuador.org/wp-content/uploads/2012/12/Corta-Atalaya-300x138.jpg 300w, http://protectecuador.org/wp-content/uploads/2012/12/Corta-Atalaya-1024x471.jpg 1024w, http://protectecuador.org/wp-content/uploads/2012/12/Corta-Atalaya-642x295.jpg 642w, http://protectecuador.org/wp-content/uploads/2012/12/Corta-Atalaya-978x450.jpg 978w"title="Corta Atalaya"height=589 src=http://protectecuador.org/wp-content/uploads/2012/12/Corta-Atalaya.jpg width=1280> </a><p class=wp-caption-text>Corta Atalaya is the largest open-pit mine in Europe.</div><a class=scroll-top href=#> Scroll to Top </a><h3>Typical phases of a mining project.</h3><p>Each phase of mining is associated with different sets of environmental impacts.  Threfore, before  and during the actual  exploitation   <strong> environmental impact assessments </strong> ( <strong> EIA </strong> s)  are needed to ensure the safety of the project. <p class="warning message rounded clearfix"><a class="hideparent right"href=#> Close </a>    <strong> An environmental impact assessment </strong> ( <strong> EIA </strong> ) is an assessment of the possible positive or negative impact that a proposed project may have on the environment, together <em> <strong> consisting of the environmental, social and economic aspects </strong> . </em><p><h4>1.Exploration</h4><p><div class="grid_6 alpha">This phase includes <em> surveys </em> , <em> field studies </em> , and <em> drilling test boreholes </em> and other exploratory excavations. The aim is to obtain information about the <strong> location </strong> and <strong> value </strong> of the mineral ore deposit. The exploratory phase may involve <strong> clearing of wide areas of  </strong></div><div class="grid_6 omega"><strong> vegetation </strong> , to allow the entry of heavy vehicles mounted wit  <em> drilling rigs.  </em> Many countries require a <strong> separate EIA </strong> for the exploratory phase of a mining project because the impacts of this phase can be profound and because further phases of mining may not ensue if exploration fails to find sufficient quantities of high-grade mineral ore deposits.</div><div class=clear></div><p><h4>2.Development</h4><p><div class="grid_6 alpha"><em> <strong> The construction of access roads, </strong> </em>  either to provide heavy equipment and supplies to the mine site or to ship out processed metals and ores, can have  <strong> substantial environmental impacts </strong> , especially if access roads cut through ecologically sensitive areas or are near previously isolated communities. <em> <strong> Site preparation and clearing.  </strong> </em> If a mine site is located in a remote,</div><div class="grid_6 omega">undeveloped area, the project proponent may need to begin by clearing land for the construction of staging areas that would house project personnel and equipment. Even before any land is mined, activities associated with site preparation and clearing can have <strong> significant environmental impacts, especially if they are within or adjacen to ecologically sensitive areas. </strong></div><div class=clear></div><p class="warning message rounded clearfix"><a class="hideparent right"href=#> Close </a>    <strong> The EIA must assess, separately, the impacts associated with site preparation and clearing. </strong></p><a class=scroll-top href=#> Scroll to Top </a><p><h4>3.Active mining</h4><p><div class="grid_6 alpha">The active mining consists of two phases: the <strong> extraction </strong> and <strong> concentration </strong> (or <em> beneficiation </em> ) of a metal from the earth. </div><div class="grid_6 omega">Metallic ores are buried under a layer of ordinary soil or rock ( <em> the overburden </em> ) that must be moved or excavated to allow access to the ore deposit.</div><div class=clear></div><p><h4>4.Disposal of overburden and waste rock</h4><p><div class="grid_6 alpha">The overburden must be moved or excavated to allow access to the metallic ore deposit. The <em> quantity of overburden generated by mining is enormous </em> . These high-volume wastes, sometimes containing  <strong> significant levels of  </strong></div><div class="grid_6 omega"><strong> toxic substances </strong> , are usually deposited on-site, either in piles on the surface or as backfill in open pits. The EIA for a proposed mining project must carefully assess the management options and associated impacts of overburden disposal.</div><div class=clear></div><p><h4>5.Ore extraction</h4><p><div class="grid_6 alpha">Extraction of the mineral ore is made using <strong> specialized heavy equipment and machinery </strong> , such as loaders, haulers, and dump trucks, which transport the ore to processing facilities using haul roads.</div><div class="grid_6 omega">This activity creates  <em> a unique set of environmental impacts </em> , such as emissions of fugitive dust from haul roads.</div><div class=clear></div><p><div class="wp-caption aligncenter"style="width: 1290px"id=attachment_457><a href=http://protectecuador.org/wp-content/uploads/2012/12/Garzweiler-Germany.jpg> <img alt="Coal mining at Garzweiler, Germany"class="size-full wp-image-457"sizes="(max-width: 1280px) 100vw, 1280px"srcset="http://protectecuador.org/wp-content/uploads/2012/12/Garzweiler-Germany.jpg 1280w, http://protectecuador.org/wp-content/uploads/2012/12/Garzweiler-Germany-300x34.jpg 300w, http://protectecuador.org/wp-content/uploads/2012/12/Garzweiler-Germany-1024x116.jpg 1024w, http://protectecuador.org/wp-content/uploads/2012/12/Garzweiler-Germany-642x73.jpg 642w, http://protectecuador.org/wp-content/uploads/2012/12/Garzweiler-Germany-978x111.jpg 978w"title="Garzweiler, Germany"height=146 src=http://protectecuador.org/wp-content/uploads/2012/12/Garzweiler-Germany.jpg width=1280> </a><p class=wp-caption-text>Coal mining at Garzweiler, Germany. Photo – Raimond Spekking.</div><a class=scroll-top href=#> Scroll to Top </a><h4>6. Beneficiation</h4><p><div class="grid_6 alpha">The next step in mining is grinding (or milling) the ore and separating the relatively small quantities of metal from the non-metallic material of the ore in a process called ‘ <strong> beneficiation </strong> .’ Milling is one of the most costly parts of beneficiation, and results in very</div><div class="grid_6 omega">fine particles that allow better extraction of the metal. However, milling also allows a more complete release of contaminants when these particles become <strong> tailings </strong> . Tailings are what remains following milling of the ore to fine particles and extraction of the valuable metal(s).</div><div class=clear></div><div class=slides_container id=slider_5897><ul class="stripped thumbnail-list-slider clearfix"><li><div class="clearfix content"><div style="background: #9EE3E1; padding: 10px 10px 14px 22px;"><strong> Tailings </strong> , also called <em> mine dumps </em> , culm dumps, slimes, tails, refuse, <em> leach residue </em> or slickens,are the materials left over after the process of separating the valuable fraction from the uneconomic fraction (gangue) of an ore. Tailings are distinct from overburden.</div></div></ul></div><script>/* <![CDATA[ */ jQuery(function($){ $('#slider_5897').slides({container: 'thumbnail-list-slider', preload: true, paginationClass: 'slides_pagination', effect: 'fade', generatePagination: false, autoHeight: true});});</script><div class="grid_6 alpha">Beneficiation includes physical and/or chemical separation techniques (sometimes involving the use of mercury). Wastes from these processes include waste rock dumps, tailings, heap leach materials (for gold and silver operations), and dump leach materials (for copper leach operations).</div><div class="grid_6 omega">The chemical separation process involves the usage of sulfuric acid for treating copper ores and  cyanide for gold ores. Metallic ores generate large quantities of waste with toxic chemicals left from this separation.</div><div class=clear></div><p class="success message rounded clearfix"><a class="hideparent right"href=#> Hide </a>    The copper content of a goodgrade copper ore may be only one quarter of one percent (0.25%). <p class="success message rounded clearfix"><a class="hideparent right"href=#> Hide </a>    The gold content of a good grade <em>   </em> gold ore may be only a few one-hundredths of <em>   </em> a percent.</p><a class=scroll-top href=#> Scroll to Top </a><p><h4>7.Tailings disposal</h4><p><div class="grid_6 alpha">Even high-grade mineral ores consist almost entirely of non-metallic materials and often contain <strong> undesired toxic metals </strong> (such as <strong> cadmium </strong> , <strong> lead </strong> , and <strong> arsenic </strong> ). The <em> beneficiation </em> process generates <strong> high-volume waste called ‘tailings’ </strong> ,  the residue of an ore that remains after</div><div class="grid_6 omega">it has been milled and the desired metals have been extracted. If a mining project involves the extraction of a few hundred million metric tons of mineral ore, then the mine project will generate a similar quantity of tailings.</div><div class=clear></div><p><h4>8. Site reclamation and closure</h4><p><div class="grid_6 alpha">When active mining ceases, mine facilities and the site are reclaimed and closed. Mines that are notorious for their <strong> immense impact on the environment </strong> often made impacts only during the closure phase, when active mining operations ceased. <strong> These impacts can persist for decades and even centuries </strong> .</div><div class="grid_6 omega"><p class=promo_text>The goal of mine site reclamation and closure should always be to return the site to a condition that most resembles the pre-mining condition.</div><div class=clear></div><p class="warning message rounded clearfix"><a class="hideparent right"href=#> Close </a>    Therefore, the <strong> EIA </strong> for every proposed mining project must include <strong> a detailed discussion of the mine Reclamation and Closure Plan </strong> offered by the mining proponent.<div class="grid_6 alpha">Mine reclamation and closure plans must describe in sufficient detail how the mining company will restore the site to a condition that most resembles pre-mining environmental quality; how it will prevent – in perpetuity –</div><div class="grid_6 omega">the release of toxic contaminants from various mine facilities (such as abandoned open pits and tailings impoundments); and how funds will be set aside to insure that the costs of reclamation and closure will be paid for.</div><div class=clear></div><br><a class=scroll-top href=#> Scroll to Top </a><br><div class=toggle-container><strong> Resources for this article: </strong><div class="hidden toggle-fulltext">ProtectEcuador.org does not own any rights over the content of this page. This article is intended for educational purposes and it is a compendium of information already existing on the internet. <p><hr><ul><li>team of experts at the <a title="ELAW website"href=http://www.elaw.org/ target=_blank> Environmental Law Alliance Worldwide (ELAW) </a> (2010). “ <a title="ELAW download page, PDFs in 4 languages"href=http://www.elaw.org/mining-eia-guidebook target=_blank> Guidebook for Evaluating Mining Project EIAs </a> “<li>BC Wild, Environmental Mining Council of BC (2006). “ <a title="download page & infos - www.miningwatch.ca"href=http://www.miningwatch.ca/publications/acid-mine-drainage-mining-and-water-pollution-issues target=_blank> Acid Mine Drainage: Mining and Water Pollution Issues </a> “<li>Wikipedia.org – <a title="Wiki - Open-pit mining "href=http://en.wikipedia.org/wiki/Open-pit_mining target=_blank> Open-pit Mining </a> , <a title="Wiki - Environmental impact assessment"href=http://en.wikipedia.org/wiki/Environmental_impact_assessment target=_blank> Environmental Impact Assessment </a> , <a title="Wiki - overburden"href=http://en.wikipedia.org/wiki/Overburden target=_blank> Overburden </a> , <a title="Wiki - Ore"href=http://en.wikipedia.org/wiki/Ore target=_blank> Ore </a> , <a title="Wiki - Copper extraction"href=http://en.wikipedia.org/wiki/Copper_extraction target=_blank> Copper Extraction </a></ul></div><p><a class=toggle href=#> Show resources </a></div><script>jQuery(function($){ $('a.toggle').toggle( function() { $(this).parents('.toggle-container').find('.toggle-fulltext').slideDown(); $(this).html('Hide resources'); return false; }, function() { $(this).parents('.toggle-container').find('.toggle-fulltext').slideUp(); $(this).html('Show resources'); return false; }); });</script></div></div><div id=comments><p class=hidden>Comments are closed.</div></div></div></div><div class=clearfix id=footer><div class=clearfix id=footer-top><div class=container_12><div class="grid_12 footer-top-wrap"><div class="grid_4 alpha"><div class="widget widget_text"id=text-5><h3 class=widgettitle>Protect Ecuador</h3><div class=textwidget><p>The purpose of this website is to serve as a resource for any individuals or organisations who will help to protect Ecuador’s environment and multi-faceted Cultures. 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