What is a continuous Miner?:

Typically, to begin a room, the continuous miner engages in cutting (removal) a 3 m (9.8 ft) wide sechon of coal to a depth determined to be safe based on local geologic conditions and mining regulations-on average up to 6.1 m. Deeper cuts can be made (called extended-cut mining) with special permission from state and federal mining regulators. After the cut coal is loaded onto haulage vehicles, the operator then backs the continuous miner out of the partially formed room, repositions the machine, and reenters to begin removing an additional 3 m section of coal to produce a wider entry. This process is repeated until a section of the seam is removed, forming a room approximately 12.2 m (approximately 40 ft) long and 6.1 m wide.

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