1. Department of Mining and Petroleum Engineering, Faculty of Engineering, Chiang Mai University, Chiang Mai 50200, Thailand
2. Department of Geological Sciences, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand
3. Department of Mechanical Engineering, Faculty of Engineering, Chiang Mai University, Chiang Mai 50200, Thailand
4. School of Energy and Electronic Engineering, University of Portsmouth, Portsmouth PO1 3DJ, U.K.