Traditional Culture Encyclopedia - Traditional festivals - How is coal dug out of the ground?
How is coal dug out of the ground?
One way to dig coal out of the ground is to dig a shaft from the ground, dig out the coal and transport it to the well; Another method is to dig a large area from the ground into an open-pit coal mine, and then dig out the coal. This is the method of digging coal in shallow coal mines.
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