The term 'Kind of Deposit' can refer to two different crossword solutions: MINERAL (7 letters) and ORE (3 letters). MINERAL deposits are naturally occurring concentrations of minerals or other geological materials that are of economic value. ORE is a type of rock that contains minerals or metals that can be extracted for commercial use. ORE deposits are formed through the process of mineralization, which involves the accumulation of minerals in a host rock.