Dolores is an open pit silver-gold mine located in Chihuahua, Mexico, and was acquired in 2012 as part of Pan American’s acquisition of Minefinders Corporation Ltd.


  • Location: Chihuahua, Mexico
  • Mine Type: Open Pit/Underground
  • Ownership: 100%
  • Products: Silver and gold doré
  • Capacity: 20,000 tpd
  • Deposit Type: Epitermal veins, stockworks, breccias, and replacements
Dolores Map

Silver and gold mineralization is present as structurally controlled, low to medium sulphidation epithermal veins, silica stock works, breccias, and replacements. Mining at Dolores is currently by standard open pit methods using shovels, loaders, and haul trucks. The mine currently uses conventional cyanide heap leaching technology to produce gold and silver doré.

A $132 million investment was approved in 2015 to develop a new underground mine to supplement the open pit operations, construct a new 5,600 tonne per day pulp agglomeration plant, and build a new power line. Following the startup of the new pulp agglomeration plant in 2017, leach pad stacking rates reached the targeted expansion level of 20,000 tonnes per day. Over the next three years, average silver production is expected to increase by approximately 27% and gold by 69% compared with 2015 production levels.

The Dolores Technical Report, on which the foregoing is based, is a preliminary economic assessment. The results of this preliminary economic assessment are preliminary in nature, in that it includes inferred mineral resources that are considered too geologically speculative to have the economic considerations applied to them that would enable them to be categorized as mineral reserves, and there is no certainty that the assessment will be realized. Mineral resources that are not mineral reserves have no demonstrated economic viability.

For more information on Dolores operations, please see our most recent Quarterly Report.

Click here to see the mineral reserves and resources estimates for Dolores, as at December 31, 2017.

Dolores reserve estimate by source, as at December 31, 2017

Dolores Technical Report (December 31, 2016)