Open questions: Surrey

Where sources disagree, MineArchive keeps both accounts rather than picking one; where a fact could not be settled, the record says so. 5 such claims on 3 records. All regions.

Brockham Hearthstone Mine

• Alfred Bishop patented the continuously burning 'Brockham patent' lime kiln in 1889, and most of the existing flare kilns were modified to the design. (disputed)
• Bishop's patent for the kiln design was taken out in August 1890, following an earlier patent of 1882 for improvements in kiln design. (disputed)
• An account of hearthstone mining in the 1890s gives an output of 200 tons a week, though the true figure was probably less than half that. (uncertain)

Marden Mine

• Also used as an ammunition store during the Second World War. (uncertain)

Nutfield and Redhill Fuller's Earth Mines

• The 'Fulling Earth Field' at Nutfield is first recorded in 1583. (uncertain)