Open questions: Perth and Kinross

Where sources disagree, MineArchive keeps both accounts rather than picking one; where a fact could not be settled, the record says so. 3 such claims on 2 records. All regions.

Blairenbathie Colliery

• In 1954 the colliery employed 929. (uncertain)

Foss Mine

• Accounts differ on when the deposit was found: BGS's Minerals in Britain profile says the Mineral Reconnaissance Programme discovered baryte in the Aberfeldy area in 1973, a 2012 description of the mine gives 1975, and the Gazetteer for Scotland says the mine opened in the late 1970s. (disputed)
• The Foss baryte shows evidence of at least five episodes of folding, which makes following it underground far from easy. (uncertain)