Also see definition of "Vein" in Word Study
Vein
VEIN [isbe]
VEIN - van: Only in Job 28:1, the King James Version "a vein for the silver," or motsa', "going forth," "source." Both the King James Version "vein" and the Revised Version (British and American) "mine" are more specialized than motsa', but the Revised Version (British and American) doubtless conveys the original meaning.
Also see definition of "Vein" in Word Study