Open questions: Kent

Where sources disagree, MineArchive keeps both accounts rather than picking one; where a fact could not be settled, the record says so. 12 such claims on 6 records. All regions.

Allington Quarry

In the region of twenty million tonnes of stone were extracted from the quarry, for local buildings, roads and railways, most recently for the Channel Tunnel Rail Link. (uncertain)
There is evidence of quarrying in the area from 1174, when Allington Castle was built, and the quarry itself had certainly existed since the 1790s. (uncertain)
In 2001 Hanson Aggregates decided to close the site and relocate to Blaise Farm near Offham, estimated to hold thirty-five million tonnes of reserves. (uncertain)
Only two ragstone quarries now operate in Kent: Hermitage Quarry at Barming, the sole supplier of Kentish ragstone building stone, and Blaise Farm, worked mainly for aggregate. (uncertain)

Betteshanger Colliery

A miner named Cephas was killed in 1934 when a lump of loosened rock fell and crushed him while hewing coal, one of a number of individual fatal accidents recorded at the colliery. (uncertain)

Chislehurst Caves

In 1903 the archaeologist William Nichols proposed that the workings were dug by Druids and extended by Romans and Saxons, and the three sections are still named accordingly on tours. (disputed)
Contemporary scholars disputed Nichols's theory, holding that most of the excavation had taken place within the previous two centuries, and the claim remains unverified; an 1862-63 Ordnance Survey map shows the site as a chalk pit with kilns and an engine house. (disputed)
A 9th-century Saxon charter is cited as the earliest mention of the site, with no further reference until about 1232; the earliest documentary evidence of the chalk workings themselves dates to 1737, and mining is thought to have ceased in the 1830s or 1840s. (uncertain)

Chislet Colliery

Coal was reached at 1,350 ft (411 m) in 1919, after the cementation process was used to consolidate the chalk; some accounts date first production to 1918. (uncertain)

Cowden Furnace

An iron furnace at Cowden is recorded in 1574 and 1588, possibly established by John Tichborne (a mill on the site was 'proved' in 1556); it was ruined by 1664. Early ironmasters named in connection with Cowden's furnaces include Quyntyn and Michael Weston, though without precise dates in the surviving record. (uncertain)

Snowdown Colliery

The No. 1 shaft was lost during sinking to a sudden water inrush at 260 ft; the Northern Mine Research Society and Dover Museum both record 22 men drowned and the shaft abandoned. (uncertain)
A detailed local history of the sinking names Edwin Knight as the first man killed at Snowdown, drowned by a sudden inrush of water into the shaft, and does not describe a mass-fatality event. (uncertain)