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<p>can drive, carrying <a href="page.php?w=ore">ore</a> and waste rock.</p>

<p><big> After closure </big></p>
<p>Open-pit mines are typically worked until either the <a href="page.php?w=mineral_resource_classification">mineral resource</a> is exhausted, or an increasing ratio of overburden to ore makes further mining uneconomic. After open-pit mines are closed, they are sometimes converted to <a href="page.php?w=landfill">landfill</a>s for disposal of solid waste. Some form of water control is usually required to keep the mine pit from becoming a lake.</p><p>
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