Pyrites Plant

Ownership: 100% Fresnillo plc
Location: Zacatecas, Fresnillo District
Facilities: Leaching plant at the Saucito mine, flotation plant at the Fresnillo mine
Commercial Production: 2Q18 (phase I), 2H20 (phase II)
Anticipated Production: Annual average 3.5 moz silver and 13.0 koz gold
Capex: US$ 155 million

The Pyrites plant is expected to improve overall recoveries of gold and silver, and therefore maximise production in the Fresnillo district; expected to total an average of 3.5 moz silver and 13 koz gold per year once both phases are operating at full capacity. 

The second phase, a flotation circuit, will treat the ongoing and historical tailings from the Fresnillo mine to produce a pyrites concentrate which will be sent to a filtration plant and then on to the leaching plant at Saucito, the final part of the process to produce the precipitates. Commissioning of phase II of the Pyrites plant set for 2H 2020.

Pyrites Plant (Phase I)

 

3Q19

2Q19

% change

3Q18

Ore processed (t)

38,572

39,159

-1.5

63,336

         

Production

       

Silver (koz)

285

333

-14.3

434

Gold (oz)

954

1,215

-21.5

1,418

         

Ore grades

       

Gold (g/t)

314

352

-10.7

423

Silver (g/t)

2.44

2.57

-5.2

2.87

Overview and Key developments:

  • The project will improve overall recoveries of gold and silver by processing historical and ongoing tailings from 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.

  • First stage completed: commissioned leaching plant at Saucito on time (2Q18), following a US$54.6 million investment.

  • Second stage: Construction of the flotation plant at Fresnillo expected 2H20, delayed due to a longer than anticipated permitting process.

Highlights - 3Q19

  • Construction of the tailings flotation plant at the Fresnillo mine (phase II) remains on track and is due to be commissioned in the second half of 2020.

  • The installation of the flotation cells and mills continued as well as the construction of the maintenance workshop and compressors.

  • This US$155 million project is expected to improve overall recoveries of both gold and silver by processing historical and current tailings from the Fresnillo and Saucito mines and once commissioned and operating at nominal capacity, is expected to contribute an additional annual production of c. 3.5 moz of silver and c. 13 koz of gold.