Maybe the Lo Aquirre is still in operation? Will have to check further as the ACA Howe report is a bit dated. (EDIT: The owner of Lo Aquirre-Minera Pudahuel went bankrupt in 2002. It was owned by the Cruzat Group.)
From the ACA Howe Report:
This area is host to several diverse types of metallic mineralization such as veins, stratiform, stockwork/ breccias, skarns, and shear zone hosted copper/gold/silver mineralization which occur in several geological environments.
Au +/- Cu-Ag veins: hosted in the Cretaceous batholith (i.e./ La Fortuna) and in stratified Mesozoic rocks (i.e./ Ramayana); also Au, Fe-Cu, Pb-Zn and Pb-Cu-Au veins which occur hosted in stratified units and intrusives of the Lower Cretaceous age
Stratiform Cu, Cu-Au, and Cu-Ag-Au: hosted in volcano-sedimentary formations of Lower Cretaceous age (i.e./ Los Amarillos).
Stockwork Au-Cu (i.e./ Rose Marie) and Au-Cu contact metamorphism related and structurally controlled mineralization : hosted in volcano-sedimentary units of Lower Cretaceous age (i.e./ Colliguay)
Cu Skarns: hosted in stratified rock of Lower Cretaceous age (i.e./ Dos Marias)
Placer Au: hosted in Quaternary sediments (i.e./ Estero Curacuvi)
(Gana, et. al., 1996)
In addition, in the volcanosedimentary rocks surrounding the batholith, or close to its contact, occur several copper deposits such as the Lo Aguirre (stratabound exhalative) and La Africana (vein) deposits both currently held by Soc. Minera Pudahuel. The locations of some of these prospects and deposits is shown on Figure 2.1. Even though most of the old mines and showings in the area have seen intermittent mining activities over the past hundred years or so, they remain relatively under explored and today are only present as prospects. The Lo Aguirre Mine is currently in production and produces 4,000 tonnes per day from a newly developed underground operation replacing a depleted open pit operation (Compendio de la Mineria Chilena, 1998).