Ernest J. Gleim

William Waugh Adams

George Randolph Hopkins

Fred Daniel De Vaney

Bennie William Gandrud

L. C. Ilsley

Hilary Breton Brunot

Edward H. Denny

James Stewart Wroth

Martin Joseph Gavin

John Stephen Desmond

Float-and-sink Fractionations and Flotation Experiments

Bauxite

S. M. Shelton

Manganese-bearing deposits of the Leadville, Colo., district are of two distinct types. Manganosiderite, a combined or intimately mixed ferrous and manganous carbonate, occurs in unaltered zones as the predominant mineral. From 50 feet below the surface to as deep as 800 feet, psilomelane and wad, both black manganese oxide minerals, are found in intimate contact with hematite and limonite.

Concentration of Manganosiderite Ore from Leadville, Colo

Fred Daniel De Vaney

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