Definitions from Wiktionary (costean)

▸ noun:  (mining) A trench in solid rock intersected by pits which reveals mineral veins.
▸ verb:  (mining) To search for 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.


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