Open questions: Bristol

Where sources disagree, MineArchive keeps both accounts rather than picking one; where a fact could not be settled, the record says so. 6 such claims on 2 records. All regions.

South Liberty Colliery

• A Newcomen pumping engine is claimed to have been installed at South Liberty in 1750 and to have remained in use until the colliery closed in 1925; a map of 1769 by Donn does not show a steam engine on the site. (uncertain)

Speedwell Colliery

• Fred Moss's memoir calls the main line the coal was trammed to the Great Western Railway, while Grace's Guide records the Kingswood collieries' goods railway joining the Midland Railway at Kingswood Junction and the story map identifies the line as the one now the Bristol to Bath Cycle Path; which company's metals the Speedwell coal reached first is not settled. (disputed)
• Besides Speedwell's own downcast winding shaft of 380 yards and Deep Pit's upcast winding shaft of 410, the Kingswood Collieries worked four other shafts: Rubens, downcast and winding, 410 yards; Donkham Pit, pumping only; Cottles Engine Pit, downcast and pumping, 290 yards; and the Doxall Shaft for winding. (uncertain)
• The Speedwell pits are given as employing 600 men at the end of the 1890s, 482 by 1930 and 310 at closure in 1936. (uncertain)
• Deep Pit was known as Tylers Pit until 1838, though it had been working from the 1790s and earlier; the discovery of the Great Vein series in the 1830s set off the expansion of the district's workings. (uncertain)
• Parkfield and Brandy Bottom closed in the same year as Speedwell, 1936, leaving Frog Lane at Westerleigh as the district's last working pit until shortly after nationalisation. (uncertain)