Mining. The act of breaking through a wall separating one mine from another; a connection between two mines resulting from such an act. Also: the…

The action of undercutting a coal-seam.

Mining and Metallurgy. A yard or floor where ores are cleaned, sorted, or amalgamated by the patio process. Also: †the patio process (obsolete).

The action or process of breaking down a coalface; (in later use) spec. the insertion of a cutting device into a coalface or rock face…

Mining (Australian and New Zealand). The process of excavating down to a mineral-bearing stratum, or to the bedrock. Cf. bottom, v. 8a. Obsolete.

In various technical, colloquial, and slang uses (see the verb).

a process for separating silver from the ore by amalgamating it with mercury on an open floor.

The cutting of coal at a fixed rate per yard.

‘The accumulation and sudden discharge of a quantity of water (in placer mining, where water is scarce).’ Raymond Mining Gloss. 1881.

Coal Mining. The action of, or the work involved in, cutting or blasting down the roof, or building supporting and blocking walls in a coal mine…

Similarly in various technical uses (see quots.); spec. in cigar-making and mining.

The action of examining by percussion; spec. auscultation; an instance of this.

= yardage, n.2 1.

Mining. The catching of ore in suspension by a blanket-sluice; the ore thus caught.

The action of creating or using a goaf in a coal mining operation; an instance of this. Also: the action of a goaf collapsing; an instance of this.

(see quot. 1967).

Chiefly Mining. A mechanized method for loading materials on to a conveyor belt, esp. coal at the coalface. Cf. power loader n. at power, n.1…

The spreading of pulverized rock in a coal mine in order to reduce the risk of coal-dust explosions. Cf. stone-dusting n. at stone, n. compounds 2a.

North American. The action or process of removing waste material from a mine. Occasionally with out (cf. compounds).

the process of filling abandoned workings with solid material, esp. spoil.

the introduction of stone-dust to the air in a mine to render the coal-dust less combustible.

the practice of using roof bolts; cf. rock bolting n. at rock, n.1 compounds 2a(a); roof bolts collectively.

the practice or technique of using rock bolts; (also) rock bolts collectively; cf. roof bolting n. at roof, n. compounds 3.