Why do porphyry copper deposits supply so much of the world’s copper?

Porphyry copper deposits are the primary source of the world’s copper, accounting for more than 50 percent of total production, due to their immense scale and economic viability.1

These deposits are characterized by disseminated mineralization, where copper minerals like chalcopyrite and bornite are distributed throughout a vast volume of shattered, permeable rock. Although the ore itself is low-grade—typically containing only 0.5 to 1.5 percent copper by weight—the deposits are physically massive, often containing billions of tons of ore.12

This combination of factors allows for large-scale, low-cost mining operations that make these deposits highly efficient and important sources of the metal. These formations are frequently associated with igneous intrusives and are notably found along the western borders of North and South America, as well as in the Philippines.21