the world > the earth > minerals > mineral deposits > [noun] > vein > vein of ore > of specific ore (3)
In Derbyshire lead mining: a short length of lead-bearing vein lying on the boundary of two properties or jurisdictions.
Mining (originally Australian). A lode or vein of quartz, esp. one which yields gold. Also: (chiefly South African) a bed or stratum, typically of…