- noting or pertaining to a type of surface mining in which massive, usually metallic mineral deposits are removed by cutting benches in the walls of a broad, deep funnel-shaped excavation.
Origin of open-pit
First recorded in 1910–15
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for open-pit
The cableway is so economical in its working that it has greatly advanced the process of "open-pit" mining.The Romance of Modern Mechanism