The phrase "PROC RARE EARTH RES CONF" is an acronym often used to refer to proceedings or conferences related to rare earth resource exploration. The term "rare earth" pertains to a group of 17 elements crucial for various modern technologies. To find synonyms for this specific phrase, we can break it down. "PROC" could be replaced with "proceedings" or "conference papers". "Rare earth" might be substituted with "rare earth elements" or "rare earth minerals". Lastly, "RES CONF" could be exchanged with "resource conference" or "exploration conference". These synonyms can be employed to convey the same concept when discussing conferences or publications concerning rare earth resource exploration.