COSTEANING
Noun
costeaning (plural costeanings)
(mining) A process for discovering metallic lodes by sinking small pits through the superficial deposits to the solid rock, and then driving from one pit to another across the direction of the vein, so as to cross all the veins between the two pits.
Source: Wiktionary
Cos"tean`ing, n.
Definition: The process by which miners seek to discover metallic lodes. It
consist in sinking small pits through the superficial deposits to the
solid rock, and then driving from one pit to another across the
direction of the vein, in such manner as to cross all the veins
between the two pits.
COSTEAN
Cos"tean` (ks"tn`), v. i. Etym: [Cornish cothas dropped + stean tin.]
Definition: To search after lodes. See Costeaning.
Source: Webster’s Unabridged Dictionary 1913 Edition