Proceedings of 4th AUN-SEED-Net Regional Conference on Natural Resources and Materials (RCNRM), 2nd International Conference on Natural Resources and Materials (ICNRM) and SMEP Metallurgical Conference (MetCon) 2011, 27 -28 October 2011, Subic Bay Travelers Hotel, Olongapo City, Philippines. (AUN/SEED-Net, 2011)