MineArchive
Menu

Ynyshir Steam Coal Company

James Thomas's company, which began sinking the Ynyshir pits in the Rhondda Fach in 1875 and 1876 and reached the Rhondda Four Foot steam seam in 1877 and 1878.

Mines operated

MineRegionYears
Ynyshir Colliery Rhondda Cynon Taf 1875–1912

Record created: 10 September 2026 · Last researched: 10 September 2026

Accessibility options

Saved in this browser and applied on every page. Colour is never the only cue on MineArchive; if links are hard to pick out, underline them or raise the contrast. For larger text, use your browser's zoom.

Contrast
Link visibility
Motion
Reading width