The prices are dated back to late 90's but maybe it can help some of the experts with some calculations.
http://minerals.usgs.gov/minerals/pu...
Chromite ore is graded by its chromic oxide (Cr2O3)
content, and its price is reported in trade journals on a grossweight
basis (U.S. dollars per metric ton, gross weight).
Commercially traded chromite ore grades range from 35% to
55% Cr2O3. Suppose, for example, that a particular chromite
ore is graded at 42% to 45% and priced at $100 per metric
ton. It contains 42% to 45% chromic oxide and costs $100
per ton, gross weight. To calculate the cost of the chromium
contained in this material, remember that chromic oxide is
68.42% chromium. Consequently, 1 ton of this material then
contains between 0.287 and 0.308 ton of chromium yielding
a unit value of between $325 and $348 per ton of chromium.
Ferrochromium typically contains between 50% and 65%
chromium, and its price is reported in trade journals in dollars
per pound of contained chromium. Chromium metal is
typically in excess of 99% pure, and its price is reported in
trade journals in dollars per pound, gross weight (Papp,
1995). A wide variety of chromium metal prices are reported
in trade journals. The units of chromium material value are
similar to those of chromium material price reported in trade
journals—dollars per metric ton, gross weight, for chromite
ore and chromium metal and dollars per metric ton of
contained chromium for ferrochromium. (To convert from
dollars per metric ton to dollars per pound, multiply by
4.536x10-4.)
The unit value of chromium in each of its commodity
forms is substantially different. In 1997, the unit value of
chromium contained in its commodity forms was, in rounded
numbers and in units of dollars per metric ton of contained
chromium— chromite ore, $200; ferrochromium, $1,000; and
chromium metal, $7,000.