Pyrites Plant

Ownership: 100% Fresnillo plc
Location: Zacatecas, Fresnillo District
Facilities: Leaching plant
Commercial Production: 1H18
Anticipated Production: Annual average 3.5 moz silver and 13.0 koz gold
Capex: US$ 155 million

This project is expected to improve and increase overall silver and gold recovery rates by processing tailings, both historical and ongoing, from the Fresnillo and Saucito mines. The plant will froth float pyrite concentrates that will be leached in a 2,000 tpd dynamic leaching plant and Merrill Crowe plant to produce precipitates.

Key developments:

  • Board approval obtained for resumption of Pyrites project given improved market conditions
  • Completed detailed engineering works, obtained environmental permits, commenced preparation of the site and orders placed for major equipment
  • First stage completed: commission of the leaching plant at Saucito on time, following a US$50.3 million investment.
  • Second stage continued: Construction of the flotation plant at Fresnillo on track with a US$7.3 million investment to date. US$46.5 million remain to be invested.


  • Ramp up production, tailing flotation facility expected to come on line by 2019