Ore ship

From Memory Alpha, the free Star Trek reference

An ore ship was a type of freighter starship used to carry loads of ore. An example of this kind of vessel is the Antares-type Woden. (TOS: "The Ultimate Computer")

During the 23rd century, ore ships designed to carry lithium visited the lithium cracking station on Delta Vega only once every 20 years. (TOS: "Where No Man Has Gone Before")