Multiple Zone Mining Plus Beneficiation of Western Phosphate Rock

A Cost Estimate and Comparison with Selective Mining

by A. F. Baker, Aarne Visnapuu, Basil Dimitriades, C. Q. Cupps, David P. Lindroth, Edward George Davis, F. E. Armstrong, Foster Fraas, Galen G. Waddell, George S. Koch, Lester M. Adams, Martin H. Stanczyk, Murray Jacobson, Richard N. Spencer, T. O. Llewellyn, Vance G. Leak, W. K. Sawyer, Barbara C. Marek, C. I. Pierce, G. C. Evans, G. T. Brow, G. V. Sullivan, Herbert B. Carroll, Ignatz L. Feld, James S. Browning, John P. Capp, Keith John Miller, Richard F. Link, Samuel L. Terry, Thomas J. Crocker, Walter G. Krawza, E. Eisentrout, Edwin W. Collins, Eugene H. Skinner, G. E. Fletcher, J. Fry, J. W. Jensen, R. B. Lowe