The phrase "a vein of ore" is correct and usable in written English.
It is typically used in the context of geology or mining to refer to a specific deposit of mineral-rich material within rock.
Example: "The geologist discovered a vein of ore that contained high concentrations of gold and silver."
Alternatives: "a deposit of ore" or "an ore vein".
Owning property in Entropia gives you exclusive taxation rights, so you get a cut every time a player buys an item in your mall, scores loot off a monster in your forest or strikes a vein of ore in your mines.
This trope ran like a vein of ore through "Deadwood," without calling much attention to itself.
He climbed into the back of a pickup truck and descended through a tunnel that followed a vein of ore into the deep, hot earth.
BRADFORD COOKE runs his finger along a vein of ore rich in silver and gold and comes as near to purring as a veteran Canadian miner can.
But, as Allen put it, "the days of locating an ore deposit by finding a vein of ore on the surface, and following it into the earth, are gone".
In fact, these companies are not necessarily mining for pigments at all and instead are seeking a certain kind of ore when they happen to run across a vein of ochre or something else.
In the tin mines of Devon and Cornwall, pasties were associated with "knockers", spirits said to create a knocking sound that was either supposed to indicate the location of rich veins of ore, or to warn of an impending tunnel collapse.
In court it was said that at Silence there was a "flat", a horizontal vein of lead ore, 40 or 50 yards long: this was something too valuable to mention out loud.
But it took weeks of patient watching before, by dint of glancing in rapid saccades, she surprised a bubble of rosy barite crystals breaking through a vein of fluorspar, and opening into the form known as a desert rose, bunched with the ore flowers of blue john.
Cold Spring, just a river landing at the time, was perfectly situated for such an enterprise; the surrounding mountains contained abundant veins of ore, and were thick with timber for fuel.
