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1740 J. Clerk Let. 16 Feb. in Publ. Surtees Soc. (1883) 76 101 Of coal-levels, pitts, or sinks.

1834 Blackwood's Edinb. Mag. May 799/1 The starving agriculturists of Glamorgan and Monmouth would displace, at half price, the full paid miner in the iron and coal levels of Merthyr Tydvil.

1837 Prize-ess. & Trans. Highland & Agric. Soc. Scotl. 11 198 The water which issues from this coal level (on the beach near Spittal), is..impregnated with magnesia.

1913 Brit. Med. Jrnl. 13 Dec. 1533/2 I got chilled after scrambling about in a most uncomfortable coal level where one could not stand upright.

1952 G. H. Dury Map Interpr. xiii. 148 It is evident from the numerous old coal levels and old ironstone levels that..gently dipping seams of coal and beds of iron ore were worked in adits not by shafts.

2002 R. Jeffreys-Jones Cloak & Dollar p. vii The thirties snooker emporia shared the dim lighting of the coal levels, but not the comradely trust and support.