Vein deposits of gold and silver are formed by igneous intrusion.
Magma that cools slowly deep below the surface produces coarse-grained intrusive igneous rocks.
Vein deposits of gold and silver are formed when magma cools.
When do vein deposits of gold and silver form?

A. When magma warms up
B. flow of electrons
C. it can be seen
D. permineralization
E. When magma cools
F. aqueous solution
G. When the air is cold
H. When water rises