A Welsh Coal Mines web page

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Gelli Colliery, Ystrad.

E. Thomas and G. Griffiths sunk this pit to the bituminous coal levels in 1870.

Four men lost their lives here in an underground accident in 1871.

In 1878 shafts were sunk to reach the steam coal levels.

Five men died of their injuries and 16 others were badly burned after an explosion in the Globe pit, on the 21st of August 1883.

They were: -

John Chubb, the under manager, John Jones, John Lewis, David Thomas and Thomas Woodliff.

Later (1884) it came under the ownership of Cory Brothers and Co, who held it until Nationalisation in 1947.

From the Inspector of Mines list 1896, there were 578 men employed at Gelli Steam and 127 men at Gelli House coal.

By 1908 the workforce numbered 777 and 128 respectively in the Steam coal and House coal pits.

In 1918 there was 380 men employed at the house coal pit and only 120 in the steam pit, and in 1923 the House coal pit was working the Pentre and Two Foot Nine seams, employing 427 men. The Steam coal pit was working the Seven Feet, Yard, Lower Seven and Five Feet seams, employing 493 men.

By 1938 only the Steam coal pit was still opened, and there were 225 men employed. The House coal pit listed as "Abandoned".

In 1945 Gelli steam coal pit employed 536.

It closed in January 1962.

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Gelli House and Steam Coal