El Porvenir

The El Porvenir mine is an underground polymetallic mine, wholly owned by Nexa Resources El Porvenir S.A.C, located in the central Andes mountains region of Peru, specifically in the district of San Francisco de Asís de Yarusyacán, in the province of Pasco, Peru. The mine is situated at kilometer 340 of the Carretera Central Highway (Lima—Huánuco route), 13 km from the city of Cerro de Pasco. The mine is located in the Central Cordillera zone, which contains the communities of Parán, Lacsanga and Santo Domingo de Apache.

Operations began in 1949 and, in 2021, the El Porvenir mine produced approximately 51.4 thousand tonnes of zinc contained in concentrates, 0.5 thousand tonnes of copper contained in concentrates, 17.7 thousand tonnes of lead contained in concentrates, 3,467.2 thousand ounces of silver contained in concentrates and 8.7 thousand ounces of gold contained in concentrates. The ore is treated at a concentrate plant that has a processing capacity of 6.5 thousand tonnes of ore per day.

The El Porvenir mine is a typical skarn deposit. The mineralization occurs within the contact of the upper Triassic limestone (i.e., exoskarn) and the granodioritic dacitic intrusive rocks (i.e., endoskarn). There are also recognized veins and replacement manto type, minor disseminated mineralization may occur within the intrusive units. West of the Milpo Atacocha fault within the Goyllarisquizga Group, mineralization is characterized as veins and disseminations. Four groups of vein/mineralized structures are reported. Structurally controlled veins are sub vertical up to 150 meters long, with a vertical extent of 350 meters. Economic mineralogy is mostly comprised of galena, sphalerite, and tetrahedrite, as well as variable and lesser pyrite, quartz and rhodochrosite.

In 2021, we completed approximately 54.3 km of diamond drilling, divided between exploratory and infill drilling. The 2021 exploration program in the Sara target identified silver, lead, zinc and gold mineralization along the strike, based on the surface and underground drilling program. The exploration program in the Integración target identified zinc, lead, silver and gold mineralization based on the underground drilling program, which is open for expansion.

In 2022, we plan to drill 19 km on the following targets: Integración, Porvenir Sur, Longreras trend (700 meters west of Sara) and Carmen Norte and Don Lucho targets between Integración and Porvenir Sur.