Mineshaft (noun)

A deep vertical or inclined excavation in the earth for the purpose of extracting minerals or other materials.

Origin:

From mine, meaning a place where minerals or other materials are extracted from the ground, and shaft, meaning a vertical passage or opening.

Examples:

1. The miners descended into the dark mineshaft, where they worked long hours to extract coal.
2. The mineshaft was the main access point to the rich veins of ore deep underground.
3. The mineshaft was supported by timbers to prevent it from collapsing.
4. The mineshaft was a dangerous place, with many hazards including cave-ins and gas buildup.
5. The mineshaft was the source of many minerals and metals that were used in industry and commerce.