It is made of a very valuable ore and is also unstable.

Others worked the processing units, which separated the valuable ore from other debris.

With each man lugging a piece of the valuable ore, all went out through the long shaft and returned to camp.

The drumstick was sucking up a thousand times its own volume of the valuable ore.

In 1915 the valuable ores in Knight's mines began to run out.

They are valuable ores of both tellurium and gold.

Gangue is the miners' term for rock in which valuable ores are embedded.

I thought maybe he'd at least have a talent for locating valuable ore and mineral deposits or something.

We have had agents on your planet before and we know very well that there are deposits of valuable ores available.

Seems he'd cornered a very valuable ore called Columbite.