Mineral Facts and Problems: 1960 Edition Page: 396
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MINERAL FACTS AND PROBLEMS, ANNIVERSARY EDITION
ounces. 99.999 percent indium brought higher
TAXES AND TARIFF
No special taxes are imposed on the indium
industry. Depletion allowance for domestic
producers of indium metal is 15 percent.
The tariff on indium metal was decreased
from 11 percent to 10.5 percent on June 30, 1958.
Indium concentrate can enter the United States
A bibliography of more than a thousand sci-
entific references on indium was published for
the period 1863-1958 (6). Research on indi-
um by producers has consisted largely of devel-
oping and improving metallurgical recovery
processes, investigating the element's proper-
ties, expanding old uses, and developing new
The Atomic Energy Commission sponsored
research work on the indium isotopes and also
on the aqueous chemistry of the element.
Recent work on indium has been confined
largely to studying the properties and applica-
tions of new semiconductor materials for elec-
tronics. Massachusetts Institute of Techno-
ogy has done work on X-ray analysis of indium
antimonide for the Army, Navy, and Air Force.
Battelle Memorial Institute worked on the
electrical properties of indium arsen ide, segre-
gation of impurities in indium antimonide, and
suggested uses for indium antimonide, arsenide,
and phosphide, three new semi-conductor ma-
In 1948 the Bureau of Mines developed a
spectrochemical method for the determination
of indium in ores (7).
The outlook is for continued growth and de-
mand for indium, particularly in the field of
The long-term outlook indicates that explora-
tion and development is needed to keep our
indium supply ahead of the demands.
A major problem is the limited and erratic
market for indium. This is largely caused by
the high cost of recovery and relatively few
uses for the element. These factors, coupled
with low indium content in zinc ores, make it
impractical for some producers to recover and
A long-range problem is to discover new
sources of indium to supplement the small
domestic reserve in zinc ores.
1. COMINCO MAGAZINE. Indium-A New Look. Con-
solidated Mining & Smelting Co. of Canada, Ltd.
Vol. 19, No. 3, March 1958, pp. 10-11.
2. CONSOLIDATED MINING & SMELTING CO. OF CANADA,
LTD. The Metal Indium and Its Uses. (Second
booklet), 1957, 13 pp.
3. FAIRHALL, LAWRENCE T. Industrial Toxicology.
The Williams & Wilkins Co., Baltimore, Md., 1949,
4. HEMPHEL, CLIFFORD A. Rare Metals Handbook.
Reinhold Pub. Co., New York, N.Y., 1954, pp.
5. KAISER, E. P., HERRING, B. F., AND RABBITT, J. C.
Minor Elements in Some Rocks, Ores, and Mill and
Smelter Products. Geol. Survey, TEI-415, April
1954, 119 pp.
6. LUDWICK, MARIA THOMPSON. Indium. Indium
Corp. of America, Utica, N.Y., 1959, 770 pp.
7. MARKS, GRAHAM W., AND JONES, BETSY M. Method
for the Spectrochemical Determination of Beryl-
lium, Cadmium, Zinc and Indium in Ore Samples.
Bureau of Mines Rept. of Investigation 4363, 1948,
8. WILLARDSON, ROBERT K., AND SHILLIDAY, THEO. S.
Where to Use the New Semiconductor Materials.
Battelle Memorial Institute. Materials in De-
sign Engineering (formerly Materials & Methods),
vol. 47, No. 3, March 1958, pp. 114-118.
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United States. Bureau of Mines. Mineral Facts and Problems: 1960 Edition, report, 1960; Washington D.C.. (digital.library.unt.edu/ark:/67531/metadc38790/m1/404/: accessed June 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.