By 2017, Fresnillo was producing 113 million silver equivalent ounces, by establishing two new companies:
Minera Saucito that currently has two flotation plants and a pyrite leaching plant utilising a Dynamic Leaching / Merrill Crowe processes, and
Minera San Julian that currently has two processing plants, one using flotation and the second one using the Dynamic Leaching / Merrill Crowe processes.
Assisting the doubling of production was the establishment of two new gold and silver Dynamic Leaching / Merrill Crowe Plants, and the employment of new technologies such as derrick screens together with hydrocyclones in the primary grinding circuits, flotation cells using the latest technological developments and vertical stirred mills that regrind to about 10 microns.
This paper focuses on the achievements in water efficiency and environmental sustainability, which were essential in order to double the silver equivalent ounce production. The four plants that operate in the Fresnillo District, in the State of Zacatecas, use treated wastewater from the City of Fresnillo and currently the company is developing another Wastewater Treatment Plant to provide the freshwater (new water) requirements for two new projects under development.
Authors
R Diaz-Colunga (1), S Gomez-Hernandez (2) and R Espinosa-Gomez (3)
Former Chief Operating Officer, Fresnillo Plc, Torreón, Coah., Mexico
Manager Metallurgy and New Projects, Fresnillo Plc, Zacatecas, Zac., Mexico
FAusIMM, Principal Consultant, Mineralis Consultants, Brisbane, QLD, Australia,
Acknowledgements
CEEC acknowledges and thanks AusIMM for organising MetPlant 2019. Proceedings can be downloaded from MetPlant 2019.