Vein (geology)
A vein was a concentration of minerals in a rock.

Veins of kelbonite ran through the mountains north of the Ba'ku village, which interfered with transporter functions. ()

The father of John Frederick Paxton designed the Orpheus Mining Complex to be mobile, knowing that in the mining business veins could dry up. ()

In 2268, a vein of pure tritanium was located in a scanner survey done by  on the planet Argus X. Upon Spock's confirming its presence during a landing party, James T. Kirk told Montgomery Scott he could mark the vein as confirmed. ()

In 2372, a  away team discovered a vein of pure polyferranide on a moon of Drayan II. ()

In 2373, a Starfleet team discovered cormaline on Torga IV, one of the richest veins Jadzia Dax had ever encountered. ()

Later that year, the Voyager tried to utilize a vein of gallicite on a Sakari planet. ()

In 2376, an away team from the  detected a vein of dilithium ore on a Delta Quadrant planet, deep enough that phasers might be needed to extract it. ()

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Geology
Mining