A Dry Metric Tonne (Ton) Unit (dmtu) is the internationally agreed-upon unit of measure for iron ore pricing. It has the same mass value as a metric tonne, but the material has been dried to decrease the moisture level.
A dry metric ton unit consists of 1% of iron (Fe) contained in a tonne of ore, excluding moisture. The price per tonne of a certain quantity of iron ore is calculated by multiplying the cents/dmtu price by the percentage of iron content. Iron ore contracts are quoted in US Cents.