Return Airway

The roadway that carries used air back out of the workings. A ventilated mine has two separate air courses — the intake bringing fresh air in to the men, and the return taking the spent air, gas and dust away — and keeping the two apart is the whole basis of mine ventilation.

Historical usage

The intake-and-return arrangement is as old as mechanical ventilation in British mines, first driven by a furnace at the bottom of the upcast shaft and later by a fan at the surface. Where more than one district was being worked, the air was divided into separate circuits, or splits, so that air already used at one face could not be sent on to ventilate another.

How it worked

Air is drawn down the downcast shaft, along the intake roadways, past the working faces and back along the returns to the upcast shaft. Doors, stoppings and brattice keep the two streams from short-circuiting into each other, and where a return has to cross an intake an air crossing carries one over the other. Men work in the intake by design; the return carries whatever the workings have put into the air, so it is the most gaseous and dustiest part of the mine and is entered as little as possible.

Why it was used

Without a return there is no circuit, and without a circuit there is no ventilation — just a dead-end filling with firedamp, blackdamp and dust. Splitting the air into separate returns for separate districts also limits how far a problem in one district can travel.

Risks & limitations

Because the return is the gassiest and dustiest roadway in the mine, anything put in it that can produce heat or flame is exceptionally dangerous. The Baddesley Colliery disaster of 1882 is the clearest British case: a steam boiler was installed in the return airway at the extreme deep of the workings to drive a pump, with its roof cut away so that smoke and flame passed along the top of the airway and coal on either side. The engineer specified a brick archway around it, which was never built. The coal caught, the smoke filled the only road in or out, and thirty-two men died. The coroner's jury found it an error of judgement to have placed the engine and boiler so far from the shaft bottom in the return airway, in such an imperfect and unprotected manner. The other standing risk is more ordinary: a return that is too small, too long or leaking into its intake will not shift enough air, and inadequate ventilation is a recurring finding in colliery disaster inquiries — including William Pit in 1947.

Regional variation

'Return' and 'intake' are standard across the British coalfields; the shafts they end at are the upcast and downcast. Older accounts speak of the 'return air course'.

Related terminology

Afterdamp, Bad Air, Brattice, Chokedamp, Firedamp, Shaft

Mines associated with this term

Included only where MineArchive's own research gives a reasonable evidential basis — not every mine where this might plausibly apply.

• Auchengeich Colliery — North Lanarkshire (well documented example)
  Automatically linked by scripts/link_terms.py: exact-phrase match in the record's own recorded text.
• Tower Colliery — Rhondda Cynon Taf (well documented example)
  Automatically linked by scripts/link_terms.py: exact-phrase match in the record's own recorded text.
• Universal Colliery — Caerphilly (well documented example)
  Automatically linked by scripts/link_terms.py: exact-phrase match in the record's own recorded text.

Disasters associated with this term

Included only where MineArchive's own research gives a reasonable evidential basis, with the nature of the relationship stated — not every disaster where this term might plausibly apply.

• Chatterley Whitfield (Whitfield) Colliery explosion (contextual relationship)
  Automatically linked by scripts/link_terms.py: exact-phrase match in the record's own recorded text.
• Auchengeich Colliery fire, 1959 (contextual relationship)
  Automatically linked by scripts/link_terms.py: exact-phrase match in the record's own recorded text.

Sources

1. (primary) Baddesley Colliery Explosion — Atherstone — 1882 — Northern Mine Research Society
2. (secondary) Ventilation — Basic Mining Process and Terminology — underground COAL

Record created: 25 August 2026 · Last researched: 25 August 2026