Open questions: County Antrim

Where sources disagree, MineArchive keeps both accounts rather than picking one; where a fact could not be settled, the record says so. 7 such claims on 5 records. All regions.

Brockley Porcellanite Quarry

• The Irish Times summary of the survey puts the stone-tool factory at about 7,000 years ago. (uncertain)

Carnlough Limestone Quarries

• The first section opened in 1854 and ran for about a mile at 1 in 25 to the quarries; operated by the Carnlough Lime Company, the system was later extended to about 7 km. (disputed)

Glenariff Iron Ore Mines

• Sources disagree on the exact closure date: Wikipedia gives 1875, when insufficient ore output, labour shortages and depressed prices halted production; the Glens of Antrim Historical Society gives 1881. Both agree the company was sold in a bankruptcy sale in 1885 after defaulting on its ground rent to the Earl of Antrim. (disputed)

Kilroot Salt Mine

• The workings extend over more than 350 hectares at over 400 m below ground. (uncertain)
• The surface site occupies the former Kilroot coastal artillery battery, decommissioned in 1956; the company operated from the fort's converted buildings before a purpose-built operations building was constructed. (uncertain)

Tievebulliagh Axe Factory

• The axes are dated 3800-2500 BC. (disputed)
• The Earth Science Conservation Review summary says Neolithic people established the factory 'somewhere around 3,000 years ago'. (disputed)