A metric ton unit (mtu) traditionally referred to one metric ton(ne) of ore containing 1% of the desired metal, though in our day usage it is practically just a measure for certain metals (especially in price quotes), thus it is a unit of mass equaling 10kg or one hundredth of a tonne.
Tungsten Prices
Metals Place APT Price CIF Europe
Price on 13 June 2007:
$243-248/mtu