methods of extraction. the most economical method of coal extraction from coal seams depends on the depth and quality of the seams and the geology and environmental factors. coal mining processes are differentiated by whether they operate on the surface or underground.
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mining of copper ores is carried out using one of two methods. underground mining is achieved by sinking shafts to the appropriate levels and then driving horizontal tunnels called adits to reach the ore. underground mining is however relatively expensive and is generally limited to rich ores.
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open-pit mining or open-cast mining is a surface mining technique of extracting rock or minerals from the earth by their removal from an open pit or borrow. this form of mining differs from extractive methods that require tunneling into the earth such as long wall mining.