An Appraisal of Minerals Availability for 34 Commodities Page: 57
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CHROMIUM
the tailings from the platinum-group metals processing con-
tain between 30 to 32 pct Cr203 with a chromium-iron ratio
of between 1.2:1 and 1.3:1. These tailings are a potential
source of chromium because the technology to extract the
chromite from the tailings and produce ferrochromium has
been demonstrated, but to date no marketable chromium
products of any form have been produced on a commercial
scale. The reasons for this are many and complex and
include a reluctance on the part of the mining companies
to make the substantial investment required to develop
large-scale facilities to utilize the tailings. A major reason
for this reluctance is the uncertainty of a market for the
chromite or ferrochromium (if it were processed to that
stage), because the ferrochromium produced from this
material would grade lower in contained chromium than
any currently being marketed.
Table 2 lists the mines and deposits that compose the
evaluated chromite resources of this study.Zimbabwe
10, 000Republic of
South Africa
23. 600WORLD RESOURCES
Other 375
Zimbabwe
753
Republics of
South Africa
5. 700RESERVE BASE
523 Republic of
South Africa
676
EVALUATED
IN THIS STUDYFigure 1.-Estimates of world chromium resources (million
metric tons).Table 1. - Summary of MEC demonstrated chromium resources evaluated for this study, as of January 1985
Demonstrated Weighted- Contained Concentration Postmill Recoverable Percent
Demonstrated Wveged Contained ratio, crude chromite
Country resource, average icue chromie of total
10mtCountry resource, grade, pct 10chromiutm, ore to chromite product grade, pct products, estimate
Cr2O3 mt product Cr203 103 mt
South Africa, Republic of ..... 675,786 41.0 277,072 1.2 43.0 466,631 68.6
Zimbabwe:
Seam type ................ 171,172 49.0 83,874 1.1 NAp 114,195 16.8
Podiform type ............. 14,357 46.5 6,676 1.2 NAp 11,730 1.7
Eluvial type ............... 3,250 20.0 650 5.6 NAp 422 .1
Total or average ........ 188,779 49.0 91,200 1.1 50.0 126,347 18.6
Philippines:
Low grade ................ 177,224 2.0 3,544 30.0 NAp 5,765 .9
High grade ............... 18,559 28.0 5,196 2.2 NAp 7,640 1.1
Total or average ........ 195,783 4.5 8,740 14.0 47.0 13,405 2.0
Turkey2 ................... . 8,300 38.0 3,154 1.3 46.0 5,846 .8
India ..................... . 79,835 32.0 25,547 1.5 46.0 42,185 6.2
Brazil3 .................... 13,450 21.0 2,824 3.5 44.0 3,538 .5
Finland ................... 25,200 27.0 6,804 1.6 31.0 17,377 2.6
New Caledonia ............. 600 44.0 264 1.5 51.0 409 .1
Greece ................... 1,653 18.0 298 3.5 51.0 450 .1
Madagascar ............... . 8,935 32.0 2,859 2.5 49.0 3,435 .5
Grand total ........... . 1,198,321 NAp 418,762 NAp NAp 679,623 100.0
NAp Not applicable.
1Does not include 21 nonrefractory deposits containing about 1.8 million mt of in situ resource; 18 are very small (average 40,000 mt reserve); 3 are fairly
large (average 360,000 mt). Does not include a further 12 refractory deposits containing about 1.1 million mt of in situ resource; 10 are very small (average
50,000 mt); 2 are fairly large (average 300,000 mt). Small size or lack of data precludes estimation of costs.
2Does not include the many small deposits and operations, representing 20 to 30 pct of Turkey's overall total production of chromite products, which are
too small or sporadic to evaluate for costs.
3Represents resource in the Campo Formoso District only.57
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United States. Bureau of Mines. An Appraisal of Minerals Availability for 34 Commodities, report, 1987; Washington D.C.. (https://digital.library.unt.edu/ark:/67531/metadc12833/m1/66/: accessed April 24, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.