costean
intransitive verb
cos·tean
variants
or costeen
käˈstēn,
ˈ⸗ˌ⸗
-ed/-ing/-s
British
: to dig trenches or small pits through the surface soil or debris to the underlying rock in place for the purpose of exposing the outcrop of a mineral deposit and determining its course
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Merriam-Webster unabridged
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