Lucky Lady - Thanks for bringing Babjak's post on the SPQ forum to out attention. I'm pasting it directly below for quick reference.
Chromite ore is graded by its chromic oxide (Cr2O3) content, and its price is reported in trade journals on a gross-weight 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. |