March 13 (Reuters) - Raiden Resources Ltd RDN.AX :
* RAIDEN RESOURCES LIMITED ENTERS INTO USD$31.5 MILLION EARN-IN AND JOINT VENTURE AGREEMENT WITH RIO TINTO
* JV PROVIDES RIO TINTO WITH OPTION TO SPEND UP TO US$31.5 MILLION TO EARN UP TO 75% PROJECT INTEREST IN EXPLORATION LICENCES IN SERBIA