Volume 87
Milling Methods 1930 Papers and Discussions Presented at Meetings Held at New York, February, 1928, 1929 and 1930, at San Francisco, October, 1929 and at Spokane, October, 1929

Title Page

Contents

Foreword

Institute Officers and Directors

Milling methods Committee

PAPERS:

Grinding and Classification

TITLE	AUTHOR
Grinding and Classification I. Surface Measurement, of Quartz Particles (With Discussion)	John Gross and S. R. Zimmerley
Crushing and Grinding II. Relation of Measured Surface of Crushed Quartz to Sieve Sizes (With Discussion)	John Gross and S. R. Zimmerley
Crushing and Grinding, III.-Relation of Work Input to Surface Produced in Crushing Quartz (With Discussion)	John Gross and S. R. Zimmerley
A Laboratory Investigation of Ball Milling (With Discussion)	A. M. Gow, A. B. Campbell and W. H. Coghill
Classifier Efficiency; an Experimental Study	A. W. Fahrenwald
Differential Grinding Applied to Tailing Retreatrnent (With Discussion)	Leon H. Banks and George A. Johnson
Importance of Classification in Fine Grinding (With Discussion)	J. V. N. Dorr and A. D. Marriott

Gravity Concentration (Pneumatic)

TITLE	AUTHOR
Elements of Operation of the Pneumatic Talk (With Discussion)	A. F. Taggart, R. L. Lechmere-Oertel

Flotation

TITLE	AUTHOR
Chemical Reactions in Flotation (With Discussion)	Arthur F. Taggart, T. C. Taylor and A. F. Knoll
Study of Differential Flotation (With Discussion)	C. R. Ince
Experiments with Flotation Reagents (With Discussion)	Arthur F. Taggart, T. C. Taylor and C. R. Ince
Reducing and Oxidizing Agents and Lime Consumption in Flotation Pulp (With Discussion)	O. C. Ralston, L. Klein, C. R. King , T. F. Mitchell, O. E. Young, F. H. Miller and L. M. Barker
Copper Sulfate as Flotation Activator for Sphalerite (With Discussion)	O. C. Ralston, C. R. King and F. X. Tartaron
Activation of Sphalerite for Flotation (With Discussion)	O. C. Ralston and William C. Hunter
Effect of Xanthates, Copper Sulfate and Cyanides on the Flotation of Sphalerite (With Discussion)	A. M. Gaudin

Testing and Calculation

TITLE	AUTHOR
Calculations in Ore Dressing (With Discussion)	W. Luyken and E. Bierbrauer
Microscopic Studies of Mill Products as an Aid to Operation at the I7t:rll Copper Mills (With Discussion)	H. S. Martin
Selectivity Index; a Yardstick of the Segregation Accomplished by Concentrating Operations	A. M Guadin

Cyanidation

TITLE	AUTHOR
Cyanide Regeneration or Recovery as Practiced by the Compania Reneficiadora de Pachuea, Mexico (With Discussion)	C. W. Lawr
Effect of Copper and Zinc in Cyanidation with Sulfide-acid Precipitation (With Discussion)	E. S. Leaver and J. A. Woolf

INDEX

TITLE	AUTHOR
Index