Dec 10 (Reuters) - Rio Tinto (LON:) Ltd :
* DECLARES MAIDEN ORE RESERVE AT JADAR
* ORE RESERVE AT JADAR IS 16.6 MT AT 1.81% LI2O AND 13.4% B2O3
* JADAR FEASIBILITY STUDY EXPECTED TO BE COMPLETE AT 2021-END; IF APPROVED, CONSTRUCTION COULD TAKE UP TO 4-YRS