1. Mining Engineering Department; Missouri University of Science and Technology; Rolla MO USA
2. Department of Earth Sciences, Faculty of Sciences; Benghazi University; Benghazi Libya
3. Department of Earth Sciences; Royal Holloway, University of London; Egham UK
4. Department of Earth Sciences; University College London; London UK
5. Geology and Geophysics Program Missouri University of Science and Technology; Rolla MO USA