What is the term for a caved-in area in a mine?

The term "gob" refers to the caved-in area in a mine, particularly in the context of underground mining. Specifically, it describes the void or the waste material that remains after the extraction of coal or other minerals. The gob area is a result of the collapse of the mine structure that occurs when the underground support is removed during the mining process.

Understanding this term is crucial for mine safety and management, as it directly relates to the structural integrity of a mining operation and the potential hazards for miners. Monitoring the gob area helps ensure that safety protocols are followed to prevent accidents or further collapses.

The other terms, while they might relate to voids or empty spaces in various contexts, do not specifically capture the mining-specific definition and implications of "gob."