Joooooles has itmetric ton unit (mtu) a unit of mass used in...

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metric ton unit (mtu)
a unit of mass used in mining to measure the mass of the valuable metal in an ore. Customarily, the metric ton unit is defined to be one metric ton of ore containing 1% metal, but it is the metal, not the ore, that is being measured. Thus the unit is really a unit of mass equal to 10 kilograms (22.0462 pounds).


from

http://www.unc.edu/~rowlett/units/dictM.html