What is a Downcomer in Mining Operations?

In the context of a mining operation, a downcomer is a shaft or inclined passageway that connects the bottom of a mine shaft to the underground workings. The downcomer allows for the transportation of personnel, materials, and equipment between the surface and the underground workings, and also serves as an escape route in case of emergency.

The term "downcomer" is derived from the fact that the shaft or passageway leads downward from the surface to the underground workings. It is often used interchangeably with the term "inclined shaft," although some sources may use the two terms to refer to different types of structures.

In general, a downcomer is a critical component of a mine's infrastructure, as it allows for the safe and efficient transportation of people and materials between the surface and the underground workings.