Open questions: North Lanarkshire

Where sources disagree, MineArchive keeps both accounts rather than picking one; where a fact could not be settled, the record says so. 17 such claims on 13 records. All regions.

Auchengeich Colliery

• The colliery is recorded as having been owned by James Nimmo and Company before nationalisation. (uncertain)

Blairmuckhill Colliery

• The BGS mine-plans catalogue holds a Mining Remediation Authority abandonment plan titled 'Blairmuckhill' (catalogue 11348, Ball, dated 1934); 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)

Broomside Colliery

• In 1947 the colliery raised 60,000 tons with 265 people. (disputed)
• The workforce peaked at 234 in 1947. (disputed)

Commonhead Colliery

• In 1850 the pit belonged to David and James Sneddon. (disputed)
• James and John Seddon were charged with culpable homicide after the 1850 explosion. (disputed)

Duntilland Colliery

• Duntilland Colliery began production in 1896 with a workforce of just under 200, owned by the Coltness Iron Co. Ltd, and closed in 1951. (disputed)
• Dewshill and Duntilland Colliery, beyond Duntilland Quarry, closed in 1943. (disputed)

Fortissat Colliery

• In March 1936 Fortissat Colliery was described as belonging to the Shotts Iron Co. (Ltd.). (disputed)

Hirstrigg Colliery

• Hirstrigg began working some time after 1880 and closed around the 1940s. (uncertain)

Knowton Colliery

• Knowton Nos. 1 and 2 worked until about 1933. (uncertain)

Milnwood Colliery

• The BGS mine-plans catalogue holds a Mining Remediation Authority abandonment plan titled 'Milnwood' (catalogue 1718, Main, dated 1884); 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)

Motherwell Colliery

• Motherwell Colliery worked coal, possibly ironstone and fireclay from the late 19th century to 1920. (disputed)

Overtown Colliery

• It closed in 1954 so that the shafts could be deepened from 305 to 430 m to reach coking coal, reopening in 1959. (disputed)
• Overtown, Wishaw, is dated 1930 to June 1954 and again 1956 to January 1968. (disputed)

Stepends Colliery

• A mid-nineteenth-century siding ran south from Stepends to a small colliery and two opencast ironstone pits, probably worked out by the 1880s. (uncertain)

Westrigg Colliery

• In 1902 the colliery, with an output of about 700 tons a day, was bought by John Nimmo and Sons. (disputed)