... (Kuznetsov, B.N Kutuzov). - Method of determining powder factor according to power of explosive (I.P.Oxanhit and P.X. Mirônov). - Method of determining powder factor according to standard powder factor ... technology 22th, Vietnam mining science and technology association, p 265 – 269. 8. Nguyễn Duy Thanh, Nguyen Dinh An, Tôn Thatt Hàm, Đinh Ngọc Hung, (2011), Actual status of the exploitation limestones ... quarry, Yen Duyen limestone quarry as follows: - Rock hardness equal 6 ÷ 12, degree of fracturing belong to level II III, IV; - After each blast carried out photographed and monitoring muck loading....