on economic subjects, with the greatest number on mine equipment, methods, and operations. 2. Nine papers...interested in the search for and exploitation of metal-bearing ores. Metal-mining papers were last published in...Equipment and Operation of the Blueberry Mine, Marquette Iron District. By R.S. Arcurmstp and L: S$: Caanot........... Slot System of Mining at Golden Queen Mine, Mojave, California. A. Kumxkn. (With discussion)...Wie By N.0. : . 84 Mining Practice at ae Bell Mine eton I Nine By erent: M. Be eros (With discussion) |