The term mineral source can be defined as a place where minerals are found. The crossword solution for this term is 'ORE', which is an acronym for 'Original Rock Excavation'. ORE is a type of rock that contains valuable minerals, such as metals, that can be extracted and used for various purposes. ORE deposits are formed by geological processes and can be found in many different locations around the world. ORE is an important source of minerals for many industries, including mining, manufacturing, and construction.