The Baguio Mineral District comprises the southern portion of the Central Cordillera, a geanticlinal mountain range that resulted from Miocene orogenesis and accentuated physiographically by later tectonism during the Pliocene and the
Quaternary. A synorogenic batholithic mass of diorite, locally known as Agno Batholith, constitutes the core of the Cordillera. This pluton intrudes Middle Miocene and older rock sequences and is responsible for some copper and, possibly, gold mineralization in the district. Subsequent minor igneous activity could also be responsible for epithermal vein deposits as well as other deposits in the region.