Miner's Concern is a term used to describe the safety of miners while they are working in mines. It includes the safety of the miners from physical hazards such as cave-ins, explosions, and toxic gases, as well as the safety of the miners from psychological hazards such as stress and fatigue. The term is also used to refer to the quality of ORE that miners are extracting, which is represented by the crossword solution 'ORE' (3 letters).