The importance of pyrite at GGP's Telfer Gold Mine17 Oct 2025 07:43
Pyrite is a key component in Telfer gold and copper ore, where it hosts and is associated with the gold and copper mineralization. The Telfer ore is processed using methods like flotation, which targets gold-bearing copper concentrate, and a pyrite regrind circuit, which is specifically designed to recover gold from the pyrite itself. The relationship between pyrite and precious metals at Telfer is complex, with gold existing both within the pyrite structure and in fractures and other micro-veins alongside other minerals.
The role of pyrite in Telfer ore
Mineralization host: Gold and copper mineralization at Telfer is found in quartz-dolomite reefs and veins within metasedimentary rocks. Pyrite is a common mineral in these reefs and veins, serving as a host for the gold.
Complex gold association: Gold is not just locked inside the pyrite crystal structure; it is also found as small grains of gold and electrum in fractures and fissures within the pyrite, which is released during deformation and remobilization events.
Associated elements: Pyrite at Telfer also concentrates other elements like silver, bismuth, tellurium, and lead, which can also be recovered during processing.
Processing the ore
Flotation: The initial processing step is a dual-train concentrator that uses flotation to separate a gold-bearing copper concentrate.
Pyrite regrind circuit: After flotation, a separate pyrite regrind circuit is used to further process the pyrite concentrate. This is done to recover the gold that is "locked" inside the pyrite, a process described in a study published on ResearchGate.
Gravity concentration: The overall recovery process also includes gravity concentration, which captures free gold particles before or in conjunction with flotation and leaching steps.