Vein deposits of gold and silver are formed by igneous intrusion.
Veins of gold ore most commonly occur in cracks and fissures in igneous rocks.
Gold deposits are found in fissures.
Where are deposits of gold found?

(A) In sediment
(B) kalenchoes
(C) fissures
(D) rocks
(E) mines
(F) coral reefs
(G) inactive
(H) calcite