Basics of an open pit mine - Mine EngineerThe definition of a open pit mine is "an excavation or cut made at the surface of . in "hard rock" mining for ores such as metal ores, copper, gold, iron, aluminum,.open pit aluminium mine,open-pit mining | BritannicaSep 7, 2010 . Open-pit mining, surface mining to obtain minerals other than coal. . Rolls of semifinished aluminum at a processing plant in Székesfehérvár,.