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DEPARTMENT OF THE INTERIOR

FRANKLIN K. LANE, SECRETARY

BUREAU OF MINES
VAN. H. MANNING, DIRECTOR

RECOVERY OF ZINC FROM
LOW-GRADE AND COMPLEX ORES

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The Bureau of Mines, in carrying out one of the provisions of its organic act-to disseminate information concerning investigations made-prints a limited free edition of each of its publications.

When this edition is exhausted, copies may be obtained at cost price only through the Superintendent of Documents, Government Printing Office, Washington, D. C.

The Superintendent of Documents is not an official of the Bureau of Mines. His is an entirely separate office and he should be addressed:

SUPERINTENDENT OF DOCUMENTS,
Government Printing Office,

Washington, D. C.

The general law under which publications are distributed prohibits the giving of more than one copy of a publication to one person. The price of this publication is 20 cents.

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First edition. March, 1919.

CONTENTS.

Page.

9

Preface.....

Introduction....

Zinc ores and concentrates suited to retort smelting.

Zinc losses in mining and milling...

Losses in mining...

Losses in milling.

Hydromechanical processes..

Electromechanical processes.

Magnetic separators...

Electrostatic separators...

Flotation processes...

Zinc recovery by different concentration processes.

Loss of zinc in lead smelting....

Scope of investigations at Salt Lake City station...

Outline of work....

Discussion of work outlined..

Mechanical concentration of zinc sulphide ores..

History of early mining in Park City.

Tailing disposal...

Tailing losses of to-day.

Creek leasing.

Moore Creek leasing mill.

Daly-West mill....

Daly-Judge milling practice...

Slime treatment at the Daly-Judge...

Flotation ..

Silver King Coalition milling practice...

Sulphide section.

Costs......

Mills on tailing flats below Park City.

Broadwater mill..

Beggs mill.....

Big Four Exploration Co. mill.

Flotation of zinc sulphide ores.

Differential flotation....

Zinc-lead sulphides.

Zinc-iron sulphide mixtures..

Dry concentration processes.

Igneous concentration...

Electrostatic separation..

Magnetic roasting and separation......

Experiments at Salt Lake City station....

Description of roaster and magnetic separator.

Tests of ores...

Zinc-iron middling from Utah-Apex mine, Bingham, Utah....

Ores from the Consolidated Nevada-Utah and the Green-

wood mines, Pioche, Nev ......

Zinc-iron middling from Broadwater mill, near ParkCity, Utah.

Ore from Carlyle mine, Steeplerock, N. Mex..

Ores from mines near Chloride, Ariz...

Summary of the magnetic-separation tests.

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