DEPARTMENT OF THE INTERIOR FRANKLIN K. LANE, SECRETARY BUREAU OF MINES VAN. H. MANNING, DIRECTOR RECOVERY OF ZINC FROM 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, 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. 2 First edition. March, 1919. CONTENTS. Zinc-iron middling from Utah-Apex mine, Bingham, Utah.... |