Mining. local. Also keval, -il. [Origin obscure.] The name given by Derbyshire lead-miners to a calcareous stone found mingled with the ore (see quots.).
1747. Hooson, Miner’s Dict., E j. Burr [is] a hard Knot or Lump in the Vein, or Sticking, of Caulk, Chirts, Kevells, &c. mixed with the Ore.
1802. Mawe, Mineral. Derbysh. Gloss., Kevel, a sparry substance found in the vein, composed of calcareous spar, fluor, and barytes.
