Universal Colliery

Overview

A South Wales steam-coal colliery that was the site of the worst mining disaster in British history — 439 men and boys killed in an explosion in 1913, twelve years after an earlier explosion at the same colliery had already killed 81.

History

William Lewis, later 1st Baron Merthyr, began developing Universal Colliery at Senghenydd — then a farming hamlet of around a hundred people — from 1890, with shaft-sinking starting in 1891 and the first coal raised in 1896. By 1913 the colliery was producing 1,800 long tons of prized steam coal a day from two shafts, Lancaster (downcast) and York (upcast), both 1,950 feet deep. The colliery suffered two catastrophic explosions twelve years apart: 81 men were killed on 24 May 1901, and 439 men and boys plus one rescuer — 440 in total — were killed on 14 October 1913, the worst death toll of any mining disaster in British history (see Disasters, below, for both). Manager Edward Shaw, convicted of safety breaches after the 1913 disaster, remained in post until the colliery finally closed in November 1928.

Geology

The colliery worked South Wales steam coal, a high-quality fuel much sought after for naval and merchant shipping, from a gassy seam whose firedamp content contributed directly to both of the pit's major explosions.

Workings

Two shafts served the colliery: Lancaster, the downcast (intake) shaft, and York, the upcast (return) shaft, both sunk to 1,950 feet.

What remains

The colliery closed in 1928 and its buildings were later demolished; the site is now occupied by Nant-y-Parc Primary School and the Welsh National and Universal Mining Disaster Memorial Garden, added to the Cadw/ICOMOS Register of Parks and Gardens in March 2024.

Nothing of the working colliery survives above ground; a 20-foot replica of the pit's winding gear (erected by the National Coal Board in 1981) and later memorial sculptures, including a 2013 centenary monument depicting a rescuer aiding a survivor, now mark the site.

Abandoned workings can be dangerous — unstable ground, uncapped shafts, flooding and bad air are common even where a site looks safe from the surface. This entry describes history and general location only; it is not an access guide.

Disasters & major incidents

• Senghenydd colliery disaster, 1901
  24 May 1901 · Explosion · 81 fatalities
  Three underground explosions killed 81 miners at Universal Colliery as the night shift was leaving — an earlier disaster at the same colliery that struck again, far more severely, in 1913.
• Senghenydd colliery disaster, 1913
  14 October 1913 · Explosion · 440 fatalities
  An explosion in the western workings of Universal Colliery killed 439 miners and one rescuer — the worst mining disaster in British history.

Sources

1. (primary) Universal Colliery / Senghenydd Mine Plans (BGS/Coal Authority, SWR1397/SWR1398) — British Geological Survey / The Coal Authority
2. (secondary) Senghenydd colliery disaster — Wikipedia

Record created: 22 August 2026 · Last researched: 22 August 2026