MINE OUTPUT is a term used to describe the materials that are extracted from a mine. ORE (3 letters) is a rock or mineral that contains valuable metals or minerals, ORES (4 letters) are rocks or minerals that have been mined and processed to extract the valuable metals or minerals, and COAL (4 letters) is a combustible black or brownish-black sedimentary rock that is composed mainly of carbon and hydrocarbons.