Vein deposits of gold and silver are formed by igneous intrusion.
Granite, on the other hand, is an intrusive igneous rock.
Vein deposits of gold and silver are formed by granite.
what are vein deposits of gold and silver formed by?

(1) mines
(2) tube
(3) calcite
(4) cracking
(5) rocks
(6) wind
(7) granite
(8) streams