What is coal extraction? Classify coal extraction and explain the classifications.

Coal extraction, also known as coal mining, is the process of obtaining coal from underground or open-pit mines. Coal is a fossil fuel formed from the remains of plants that lived millions of years ago. It is a significant energy source globally, primarily used for electricity generation and industrial processes.

There are two primary methods of coal extraction: surface mining and underground mining. These methods are further classified based on the techniques and equipment used to extract coal.

1. Surface Mining:
   Surface mining, also known as opencast or open-pit mining, is the most common method of coal extraction, particularly when coal seams are relatively close to the surface. Surface mining ________ ____ _____ ____ _____ _______ ______ ______ ___ ________ ________ ______.
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