lined.

Mine shafts may be used for a variety of purposes, including as a means of escape in the event of an emergency underground and allowing for the movement of:

* People
* Materials
* Mine services (such as compressed air, water, backfill, power, communications and fuel)
* Ventilation air
* Broken rock (in the form of payable ore, or non payable waste)
* Or any combination of the above

When the top of the excavation is the ground surface, it is referred to as a

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