The El Toqui deposits consist of skarn-type stratified deposits and manto-type mineralized bodies.

The Toqui deposits were discovered in the early 1970's. The three original deposits at Toqui, Doña Rosa, Mallín-Monica and San Antonio adjoin each other but are separated by faults. The Toqui property encompasses an area of approximately 1,800 square kilometres. This area includes the Doña Rosa zinc-gold mine, Rosa West zinc-lead mine, the San Antonio East and Mallín-Mónica and Mallín South zinc mines, the Aserradero and Mina Profunda gold-zinc mines.

Zinc/gold mineralisation at Toqui occurs as manto deposits hosted by an 8 metre to 12 metre thick bed of fossiliferous limestone, known as the Main Manto unit. The Toqui deposits all dip gently to the south, and most deposits are amenable to room and pillar mining, with 11 metre rooms around 8 metre pillars.

Mining is normally carried out in a single horizon from flat lying mineralisation varying in thickness from four to 12 metres, except where localised faulting may offset the manto into smaller stopes accessed via mine ramps. In Estatuas, there is a lower secondary manto which has economic zinc grades and is being mined.

The Toqui district contains a series of skarn and replacement orebodies within a 24 km2 area. Oldest rocks include Jurassic andesite and Cretaceous volcanic sandstone and tuff of the Toqui Formation, with a basal 5- to 30-m-thick limestone unit, rich in oyster fossil ........

The El Toqui mine has been in operation since 1983.
The mining method is room-and-pillar.

The project is located in the Alto Mañihuales area, in the province of Coyhaique, and corresponds to an underground extractive operation that, historically, has mainly produced zinc and lead concentrate, and since 2007 it has sporadically produced gold and silver concentrate. It consists of several underground deposits, a crushing, grinding, concentrating, thickening, leaching plant, and other general service facilities.

Crushing - Size reduction from 90 cm to 7 mm
Grinding - Size reduction to 7 cm at 120 micromillimeter
Concentration - Flotation, gravity concentration
Filtration - Reduction of water content to 9%
Tailings - It is deposited in the form of paste inside the mine and filtered tailings

Produce:
Zinc concentrate with low grade Gold
Lead concentrate
Gold concentrate
Zinc concentrate with high grade Gold
Gravity Gold concentrate
Metal Dore

Minera Pacífico del Sur currently extracts mainly zinc ........