1. Department of Natural Resources and Environmental Studies, National Dong Hwa University, Hualien 97401, Taiwan
2. Department of Mining Engineering, Institut Teknologi Nasional, Yogyakarta 55281, Indonesia
3. Department of Applied Economics, National Chung Hsing University, 145 Xingda Rd., South Dist., Taichung City 40227, Taiwan
4. Department of Environmental Engineering, Faculty of Infrastructure Planning, Universitas Pertamina, Jakarta 12220, Indonesia
5. Center for Interdisciplinary Research on Ecology and Sustainability, College of Environmental Studies and Oceanography, National Dong Hwa University, Hualien 97401, Taiwan