Volume 184
Mining Branch 1949
Metal Mining, Minerals Beneficiation, Coal, Industrial Minerals and Geophysics
Papers and Discussions presented at Meetings held at Columbus, October 23-24, 1946; Los Angeles, October 25, 1946; Denver, October 1, 1947; New York, February 15-19, 1948; St. Louis, October 13-16, 1948; Los Angeles, October 15, 1948; El Paso, October 24-28, 1948; White Sulphur Springs, Nov. 3-4, 1948; Pittsburgh, November 12, 1948; and San Francisco, February 13-17, 1949

Title Page

Foreword By Edward H. Robie

Contents

Metal Mining

TITLE	AUTHOR
Operational Statistics of a Marion 5560 Power Shovel	George B. Clark and George L. Reiter
Alluvial Tin Mining in Malaya	A. D. Hughes
Discussion	A. D. Hughes
Drilling Blastholes at the Holden Mine with Percussion Drills and Tungsten Carbide Bits	Elton A. Youngberg
Discussion	Elton A. Youngberg
Aerial Photographic Contour Maps for Strip Mines	George Hess and R. H. Swallow
Discussion	George Hess and R. H. Swallow
Drilling and Sampling Unconsolidated Materials	Leon W. Dupuy
Sinking with the Hydro-mucker at Mather "B" Shaft	J. S. Westwater
Diamond Drilling Quartz-feldspar Intergrowths	L. C. Armstrong
Discussion	L. C. Armstrong
Safety Practices at the Crestmore Mine of the Riverside Cement Company	R. H. Wightman and G. H. Adams
Discussion	R. H. Wightman and G. H. Adams
History of Pumping at the Chief Consolidated Mine, Eureka, Juab County, Utah	John G. Hall
Sublevel Stoping in Small Mines	J. J. Lillie
Symposium on Western Phosphate Mining: Foreword	E. M. Norris
Geological Studies of the Western Phosphate Field	V. E. McKelvey
Mining of Phosphate Rock at Conda, Idaho	T. C. Russell
Anaconda Phosphate Plant, Beneficiation and Treatment of Low Grade Idaho Phosphate Rock	R. J. Caro
Surface Strip Phosphate Mining at Leefe, Wyoming, and Montpelier, Idaho	D. L. King
Mining Operations of the Montana Phosphate Products Company	R. J. Armstrong and J. J. McKay
Phosphate Mining by the Simplot Fertilizer Company near Fort Hall, Idaho	Heath B. Fowler
Safety in Mining at the Andes Copper Mining Company's Property, Potrerillos, Chile	C. M. Brinckerhoff
Mechanization at the Bureau of Mines Oil-shale Mine	E. D. Gardner and E. M. Sipprelle
Enhancement and Hazard Factors as Related to Mine Valuation	J. Murray Riddell
What's New in Mining Safety	J. J. Forbes and S. H. Ash
A New Method of Weighting Core and Cuttings in Diamond Drilling	Josiah Royce
Mining Potash Ores in Carlsbad Area	Russell G. Haworth
A New Incline in the Metaline District	Chas. A. R. Lambly

Minerals Beneficiation

TITLE	AUTHOR
The Flotation of Copper Silicate from Silica (Correction, p 330)	R. W. Ludt and C. C. DeWitt
Thickening-Art or Science?	E. J. Roberts
Effects of Rod Mill Speed at Tennessee Copper Company	J. F. Myers and F. M. Lewis
Discussion	J. F. Myers and F. M. Lewis
Sintering Characteristics of Minus Sixty-five and Twenty Mesh Magnetite	Alan Stanley and Joseph C. Mead
Humphreys Spiral Concentration on Mesabi Range Ores	Whitman E. Brown and Louis J. Erck
Discussion	Whitman E. Brown and Louis J. Erck
Jaw Crusher Capacities (Blake Type)	D. H. Gieskieng
Discussion	D. H. Gieskieng
Pretreatment of Mineral Surfaces for Froth Flotation	S. A. Falconer
Studies on the Activation of Quartz with Calcium Ion	Strathmore R. B. Cooke and Marcus Digre
The Flotation of Quartz Using Calcium Ion as Activator	Strathmore R. B. Cooke

Coal

TITLE	AUTHOR
Underground Anemometry	Cloyd M. Smith
Discussion	Cloyd M. Smith
Application of Screening and Classification for Improved Fine Anthracite Recovery	W. J. Parton
Discussion	W. J. Parton
A Technical Study of Coal Drying	G. A. Vissac
Discussion	G. A. Vissac
Sampling of Coal for Float-and-sink Tests	A. L. Bailey and B. A. Landry
Discussion	A. L. Bailey and B. A. Landry
Aerial Photographic Contour Maps for Strip Mines	George Hess and R. H. Swallow
Discussion	George Hess and R. H. Swallow
Drying Low-rank Coals in the Entrained and Fluidized State	V. F. Parry, J. B. Goodman, and E. O. Wagner
Discussion	V. F. Parry, J. B. Goodman, and E. O. Wagner
Coal Washing in Colorado and New Mexico	J. D. Price and W. M. Bertholf
Discussion	J. D. Price and W. M. Bertholf
The Rupp-Frantz Vibrating Filter	W. M. Bertholf and J. D. Price
Discussion	W. M. Bertholf and J. D. Price
Synthetic Liquid Fuels from Coal	J. D. Doherty
Discussion	J. D. Doherty
Municipal-water Needs vs. Strip Coal Mining	Gregory M. Dexter
Correlation of the Performance Characteristics of Domestic Stoker Coals with Their Chemical and Petrographic Composition	Roy J. Helfinstine and Gilbert H. Cady
Ready-made Heat from Coal	D. W. Loucks
Coal Washing in Washington, Oregon, and Alaska	M. R. Geer and H. F. Yancey
Discussion	M. R. Geer and H. F. Yancey
A Study of Coal Classification and Its Application to the Coking Properties of Coal	Michael Perch and Charles C. Russell
An Evaluation of the Performance of Thirty-three Residential Stoker Coals	James B. Purdy and Harlan W. Nelson
Discussion (Page 222, 411)	James B. Purdy and Harlan W. Nelson
Work of the U. S Geological Survey on Coal and Coal Reserves	Paul Averitt
Discussion	Paul Averitt
Some Aspects of Mechanical Coal Cleaning in Utah	Carl S. Westerberg
Discussion	Carl S. Westerberg
Cyclone Operating Factors and Capacities on Coal and Refuse Slurries	D. A. Dahlstrom
Discussion	D. A. Dahlstrom
Coal Mine Development in Alaska	Albert L. Toenges
Discussion	Albert L. Toenges
Economics of Coal for West Coast Power Generation	Claude P. Heiner
Discussion	Claude P. Heiner
Performance Tests of an Experimental Installation of Cyclone Thickeners at the Shamrock Mine	T. Fraser, R. L. Sutherland, and F. F. Giese

Industrial Minerals

TITLE	AUTHOR
Importance and Application of Piezoelectric Minerals	Hugh H. Waesche
Beneficiation of Industrial Minerals by Heavy-media Separation	G. B. Walker and C. F. Allen
Discussion	G. B. Walker and C. F. Allen
Texas White Firing Bentonite	Forrest K. Pence
Recent Trends in Asbestos Mining and Milling Practice	Michael J. Messel
Discussion	Michael J. Messel
Formation and Properties of Single Crystals of Synthetic Rutile	Charles H. Moore, Jr.
Open Fracture in Langbeinite, International Minerals and Chemical Corporation's Potash Mine, Eddy County, New Mexico	James B. Cathcart
Salt Resources of West Virginia	Paul H. Price and John P. Nolting
Symposium on Western Phosphate Mining: Foreword	E. M. Norris
Geological Studies of the Western Phosphate Field	V. E. McKelvey
Mining of Phosphate Rock at Conda, ldaho;	T. C. Russell
Anaconda Phosphate Plant, Beneficiation and Treatment of Low Grade Idaho Phosphate Rock	R. J. Caro
Surface Strip Phosphate Mining at Leefe, Wyoming, and Montpelier, Idaho	D. L. King
Mining Operations of the Montana Phosphate Products Company	R. J. Armstrong and J. J. McKay
Phosphate Mining by the Simplot Fertilizer Company near Fort Hall, Idaho	Heath B. Fowler
Studies on the Activation of Quartz with Calcium Ion	Strathmore R. B. Cooke and Marcus Digre
Some Economic Aspects of Perlite	C. R. King
The Mining, Milling, and Processing of Perlite	Fred D. Gustafson
New York Talcs, Their Geological Features, Mining, Milling, and Uses	A. E. J. Engel
Electrical Dewatering of Phosphate Tailing	E. C. Houston, V. J. Jones, and R. L. Powell
Occurrence and Exploration of Barite Deposits at Cartersville, Georgia	Thomas L. Kesler
The Pegmatites of Jasper County, Georgia	Lendall P. Warriner and Blandford C. Burgess
A Simple Method for Making Stereoscopic Photographs and Micrographs	Louis Moyd
Lightweight Aggregate Industry in Oregon	N. S. Wagner and R. S. Mason
Titanium Investigations: The Laboratory Development of Mineral-dressing Methods for Arkansas Rutile	M. M. Fine, H. Kenworthy, R. B. Fisher, and R. G. Knicherbocker
Guide for Buying Domestic Muscovite Mica	Blandford C. Burgess
Economics of Mineral Pigments	W. M. Myers
Petrology of High Titanium Slags (Abstract.)	Charles H. Moore, Jr. and H. Sigurdson

Geophysics

TITLE	AUTHOR
Temperature Compensation of Old Type Askania Magnetometers	T. Koulomzine
The Economics of Geophysics in Mining Exploration	J. J. Jakosky
Aerial Magnetic Survey of the Vredefort Dome in the Union of South Africa	Oscar Weiss

INDEX

TITLE	AUTHOR
Discussions included in Volume 184
Index