Aug 19 (Reuters) - Rio Tinto (LON:) Ltd :
* PRODUCTION GUIDANCE FOR REFINED COPPER IN 2020 IS NOW 135 TO 175 KT
* RIO TINTO'S KENNECOTT MINE IN UTAH HAS EXPERIENCED DELAYS TO RESTART OF SMELTER DUE TO UNEXPECTED ISSUES
* EXPECT TO HAVE SMELTER FULLY OPERATIONAL IN TWO MONTHS