Mining. A mass of rock enclosed within or interrupting a vein of ore; = horse, n. 11. Now rare.

a mass of rock that interrupts a vein of ore; also, the front cross-piece of a blast furnace.

Mining. A bed of clay or stone running across a mineral vein or seam.

Geology. A narrow deposit of a mineral or minerals forming a partition within a larger body of rock.

A mass of rock or earthy matter enclosed within a lode or vein (usually part of the rock through which the lode runs); a fault or obstruction in…

Geology and Mining. A dislocation or break in continuity of the strata or vein. Also, a flaw or dislocation in ice. Cf. French faille.

Mining and Geology. A horizontal displacement or dislocation of a vein or stratum, at a ‘fault’.

spec. Mining. A stratum or bed of stone or other substance occurring irregularly. Cf. band, n.2 12.

(see quot. 1945).

Coal Mining. In a coal seam: a space filled with sand, clay, or rock; = horse, n. 11a. Obsolete. rare.

Scottish. Mining. Whitish rock forming an intrusion in a coal seam. Cf. horse, n. 11a. rare.