Open questions: Powys

Where sources disagree, MineArchive keeps both accounts rather than picking one; where a fact could not be settled, the record says so. 16 such claims on 10 records. All regions.

Abercrave Colliery

• The BGS mine-plans catalogue holds a Mining Remediation Authority abandonment plan titled 'Abercrave' (catalogue SW204, Two Feet., dated 1953); the catalogue gives no location and the plan's details do not clearly tie it to this working, so it may belong to another of the same name. (uncertain)

Brynhenllys Colliery

• The Waunlwyd slant, part of Brynhenllys Colliery, was claimed to be the first colliery in the South Wales coalfield to have a stay-down strike, in October 1934, when twenty-four men stayed down for six and a half hours. (uncertain)

Diamond Colliery

• The Diamond Colliery closed in 1938. (disputed)
• The Diamond Colliery was closed by the National Coal Board in April 1947. (disputed)

Dylife

• The 1858 transfer of the Dylife mining interests to the Dylife Mining Co. Ltd involved the prominent Victorian politicians Richard Cobden and John Bright. (uncertain)
• A site visit in September 2010 found the Martha Wheel pit — the wheelpit of the Rhod Goch — some 40 ft deep and restored in 2005, with the Llechwedd shaft, several adits and old lead flues traceable among the spoil, and wooden pipework surviving near one adit mouth. The visitor described the stream disappearing and reappearing repeatedly into old workings, frequent collapses, and new adits opening after heavy rain. (uncertain)
• Accounts differ on how big the settlement grew: the figure usually given is over a thousand people, while Powys County Archives puts the community at around 1,500 at its height. (uncertain)

Gurnos Colliery

• It abandoned the Four Feet seam in November 1922 and the Peacock or Brass seam in August 1928, when it closed, and was retained for pumping until 1944. (disputed)
• It employed 250 men in 1930 and 1934 and closed prior to 1947. (disputed)

Gwaunclawdd Colliery

• NMRS heads its page 'Ystalyfera', but its grid reference, the BGS plans (Powys) and Welsh Coal Mines place the colliery at Abercrave, working under Mynydd Drum with Abercrave and International collieries. (disputed)

International Colliery, Abercrave

• The BGS mine-plans catalogue holds a Mining Remediation Authority abandonment plan titled 'International, Abercrave' (catalogue SW198, Peacock, dated 1954); the catalogue gives no location and the plan's details do not clearly tie it to this working, so it may belong to another of the same name. (uncertain)

Llwyngwern Quarry

• Wikipedia dates the experiment in green living on the site to 1972; the Royal Commission's record says the Centre for Alternative Technology was founded in 1973. (disputed)

Penwyllt Quarry

• The Penwyllt Dinas Silica Brick company quarried silica sand at Pwll Byfre and manufactured refractory bricks at the Penwyllt brick works, destined for use in industrial furnaces; a narrow-gauge railway with a rope-worked incline transported silica sand and stones to the brickworks, which stood adjacent to the Neath and Brecon Railway. The works closed in 1937 or 1939. (disputed)
• Three groups of kilns are recorded: two at Penwyllt quarry created in the railway age by Jeffreys, Powell and Williams and dated 1878; a bank of four at Pen-y-foel near the Penwyllt Inn erected around 1863 to 1867, it is thought by the Brecon Coal & Lime Co., with a loading bank for railway wagons in front; and a bank of seven at Twyn-disgwylfa built by Joseph Claypon between 1836 and 1842, largely destroyed by quarry tipping with only one draw arch now visible. (uncertain)

Ystradgynlais Colliery

• In 1896 it employed 155 men underground and 29 at the surface. (disputed)
• In 1896 it employed 159 men underground and 29 at the surface. (disputed)