Three major orebodies and several smaller ore zones have been discovered in Highland Valley. All of these exhibit abundant evidence of a structural control which can be correlated to the evolution of a structural system comprising the Lornex and Highland Valley faults. This structural system may have originated early in the history of the Guichon batholith, and as it evolved, provided for the periodic escape of mineralizing solutions from the magma chamber into structurally prepared sites. The system is composed of the intersecting Lornex and Highland Valley faults and their displaced segments. Simultaneous movement on these faults created the tensional fractures which were filled with both dikes and the mineral components which now make up the ore bodies. A porphyry copper model that derives metals from a differentiating magma would best fit the data as interpreted in this paper.