Alamo Dorado is an open pit silver-gold mine located in Sonora, Mexico, and was acquired by Pan American in 2003 with the acquisition of Minera Corner Bay.
- Location: Sonora, Mexico
- Mine Type: Open Pit
- Ownership: 100%
- Products: Silver and gold doré, copper-lead rich precipitate
- Capacity: 4,000 tpd
- Deposit Type: Epithermal quartz vein stockworks
Silver and gold mineralization is present as structurally controlled, low sulphidation epithermal quartz veins and stockworks. Open pit mining finished by year end of 2015, and the mine is expected to process stockpiles into the early part of 2017.
Until 2015, Alamo Dorado operated as a conventional surface mine utilizing hydraulic shovels, front end loaders, and trucks. The mine stockpiled low grade and mineralized waste category material, processing high grade material first in order to maximize the return on investment. At the end of 2015, the open pit mining operations were completed and the mine now plans to process the lower grade stockpile material for as long as it is economically viable to do so.
Ore is treated by conventional crushing and semi-autogenous and ball mill grinding followed by thickening, agitated cyanide leaching, leach residue filtration, direct electrowinning to produce a cathode sludge, AVR (acidify, volatilize, and re-neutralize) cyanide recovery and recirculation, leach residue washing with AVR product solutions, dry stack tailings, and conventional silver and gold doré production from melting of the cathode sludge. The nominal design treatment rate is 4,000 tpd of ore.
For more information on Alamo Dorado operations, please see our most recent Quarterly Report.