1. 1) JOGMEC: Kinzoku Shigen Kaihatu no Kiso, (Asakura Syoten, Tokyo, 2008) , pp.1-22.
2. 2) B. Elevli: International Journal of Surface Mining, 9 (1995) , 149-153.
3. 3) M. Osanloo, , J. Gholamnejad, B. Karimi: International Journal of Mining, 22 (2008) , 3-35.
4. 4) A. Akaike. : Ph D. thesis, the Colorado School of Mines, 241p., (1999) .
5. 5) H. Lerchs and I. F. Grossmann: Canadian Institute of Mining Bulletin, 58 (1965) , 47-54.