Coslet Colliery

Overview

One of the many Dowlais Iron Company levels feeding the works with coal and iron ore, closing with the rest of the wider Dowlais Collieries complex in 1924.

History

Coslet Colliery was used by the Dowlais Iron Company to feed its iron works, and was abandoned in May 1924. It formed part of the wider "Dowlais Collieries" complex, the umbrella name for everything worked for the Dowlais Iron Works, which comprised Coslet alongside Black Ball, Blaen Dowlais, Brewhouse, Buxton's, Carno, Cwmcenol, Morgan's, Pant-y-Waun, Penyard, several Penydarren pits, Pen-yr-Heol, Price's, Rhas Las, Tyla Dowlais and Vanwain — all worked for coal and ironstone and abandoned together in that same month.

Geology

Unknown — no specific seam is named for Coslet itself in the sources read for this pass.

Workings

A level worked for coal and iron, part of the wider Dowlais Collieries complex.

Closure

Abandoned in May 1924, along with the rest of the wider Dowlais Collieries complex.

What remains

Unknown.

Nearby mines

• Banwaun Colliery — 0.3 km N
• Twyn-y-Waun Colliery — 0.4 km SW
• Price's Colliery — 0.7 km NE
• Vanwain Colliery — 0.7 km SW
• Blaen Dowlais Colliery — 1.1 km N

Straight-line distance, within 15 km. Show on the map.

Recorded claims

Individual factual claims, each attached to the source(s) that support it below. Where sources disagree, both are kept.

• Used by the Dowlais Iron Company to feed its iron works, abandoned in May 1924. ¹
• Named among the pits making up the wider Dowlais Collieries complex, all worked for coal and ironstone and abandoned together in May 1924. ²
• Owned by the Dowlais Iron Company throughout its documented working life. ²

Photographs & further reading

Sources

1. (secondary) Small collieries of the Dowlais Cwmbargoed & Penydarren areas — Northern Mine Research Society
2. (secondary) Dowlais Collieries — Northern Mine Research Society

Record created: 15 September 2026 · Last researched: 15 September 2026