The main gold base metal mineralization zone is approximately 8 km wide, trends north south for tens of kilometers, and is centrally located at 16° 20' to 16° 26' N latitude and 120° 37' 30" to 120° 43' 30" E longitude. The western boundary of this zone is defined by a volcanic belt, just west of Baguio City, while the eastern boundary is defined by an intrusive belt, just east of the Itogon and Antamok mines. The Agno quartz diorite batholith is further east near Binga Dam. Key mines, starting from the south, include the Philex (Cu), Acupan (Au), Itogon (Au), Black Mt. (Cu), Benguet Exploration (Cu), Atok (Au), Antamok (Cu and Au), and Baguio Gold (Au), where Baguio Gold and Antamok are east of Baguio City. Continuing northwards, key mines include the King Solomon (Cu), St. Nino (Cu), Boneng (Cu), Lobo (Cu), Gambang (Cu and Au), and Lepanto (Cu and Au).