Sept 21 (Reuters) - Rio Tinto (LON:RIO) Ltd RIO.AX :
* Rio Tinto PLC says adopts global paid parental leave standard, starting with U.S. operations
* Will implement a new global minimum standard for paid parental leave for all employees
* New global minimum standard provides 18 weeks of paid parental leave at full pay following birth or adoption of a child to all employees
* 18 weeks leave will be granted to an employee designated as child's primary caregiver; it is not gender specific