<p>The Mining and Drilling sector comprises industries and companies involved in extracting naturally occurring mineral solids, such as coal and ores; liquid minerals, such as crude petroleum; and gases, such as natural gas. quarrying, well operations, beneficiating (e.g., crushing, screening, washing, and flotation), and other preparation customarily performed at the mine site, or as a part of mining activity.</p> <p>Industries and companies involved in Oil and Gas extraction are listed under <a href="/Business/Energy_and_Environment/Oil_and_Gas/">Business/Energy_and_Environment/Oil_and_Gas/</a><br> <br> </p> <p><i>(Source: This category description is based on the North American Industry Classification System (NAICS), 1997).</i>