How is silver ore processed after it is mined?

After silver ore is mined via open-pit or underground methods, it undergoes a multi-stage process to concentrate the mineral and extract the metal.1

Concentration

Because most silver ores are sulfides, they are typically processed through flotation. In this method, the ore is crushed and ground into fine particles, then mixed with water and chemicals to make the silver-bearing minerals hydrophobic. These particles adhere to air bubbles and rise to the surface as a froth, which is skimmed off, achieving a 30- to 40-fold concentration of mineral values.123

Extraction and Refining

The subsequent extraction method depends on the primary metal associated with the silver (such as lead, zinc, or copper).4
* Lead Concentrates: These are roasted and smelted into lead bullion. Silver is then removed using the Parkes process, where zinc is added to the molten bullion to form silver-zinc compounds. These are skimmed off and treated by cupellation to isolate the silver.5
* Cyanide Process: This hydrometallurgical method involves dissolving silver from finely ground ore using a dilute cyanide solution, followed by precipitation with zinc dust.6