Directional Terms
Breast - Advancing in a near - horizontal direction , also the working face of an opening
Inby - Towards the working face , away from the mine entrance
Outby - Away from the working face , towards the entrance
Overhand - Advancing in an upward direction
Underhand - Advancing in downward direction
Excavation Terms
Adit - main horizontal or near - horizontal underground opening , with single access to the surface
Bell - funnel shaped excavation formed at the top of a raise to move bulk material by gravity from a stop to a drawpoint
Bleeder - Exhaust ventilation lateral
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