Workings in the No.3 Yard Seam in Aberdare, Trecynon and Cwmbach

Scope and Content

Plan showing workings in the No.3 Yard Seam (or Seven Feet at Bwllfa or Five Feet of PD [Powell Duffryn]). Nantmelyn, Bwllfa, Cwmdare, Park, Dare, Graig, Blaengwawr, Cwmbach, No.9, Forge, River Level, Mountain, Blaenant, Werfa and Tunnel. Merthyr Tunnel is also referred to on the plan. The plan is undated but shows workings from 1870s to 1947. Scale 6 Inches: 1 Mile.

Administrative / Biographical History

The location shown on the plan corresponds to Ordnance Survey, Glamorgan Sheets 11SE and 18NE.

Custodial History

Previous reference number: DNCB/75/7/2