Please answer the following question: Fact 1: Vein deposits of gold and silver are formed by igneous intrusion. Fact 2: Veins of Gold ore most commonly occur in cracks and fissures in igneous rocks. Given the two facts above, answer the question "Where are deposits of gold found?" with the following options: - In sediment - kalenchoes - fissures - rocks - mines - coral reefs - inactive - calcite
A:
fissures