The action or process of splitting rock using gads (gad, n.1 6).

The process of sinking a costean.

spec. The refining of a substance or product; esp. the removing of impurities or unwanted elements by some process, or series of processes.

the boring of wells or shafts using a drill suspended and worked by means of a rope.

U.S. Mining. The washing away of dirt by means of a jet of water from a pipe, as a method of extracting gold or ore. Cf. pipe, v.3 4. Obsolete.

Mining. The process of extracting gold and silver from certain ores by means of chlorine.

Opencast mining.

= resuing, n. Chiefly attributive, esp. in resue mining.

A method of mining used for narrow veins, in which the rock wall adjacent to the vein is removed by cutting or excavating in steps or layer by layer…

The practice of using bacteria to extract metals and minerals from ores. Cf. bioleaching n. at bio-, comb._form affix 2c.