Silver ore need not contain one dominant silver mineral. Silver may occur as native metal, in silver sulfides or within carrier minerals in lead-zinc-gold systems, so preparation depends on its mineralogical host.
- Occurrence
- Native silver or silver-bearing minerals
- Common context
- Lead-zinc and gold systems
- Preparation key
- Identify the mineral host of silver
Which minerals can carry silver?
Silver can occur as native metal, in silver sulfides such as acanthite, or as microscopic phases associated with galena and other sulfides. Similar silver grades can therefore require different grinding because the mineral host differs.
Characterisation should identify not only total Ag but also the host mineral and grain-size relationship.
Grinding target follows the carrier mineral
If silver occurs in coarse liberated particles, unnecessary overgrinding may be undesirable; fine sulfide association can require more controlled size reduction for liberation.
Crushing and grinding are assessed together with downstream metal-recovery testwork.
Relationship with polymetallic ores
Many silver ores are processed with lead, zinc, copper or gold minerals, so silver alone does not define the circuit. Testwork should establish which product receives the silver value.
This article does not promise a metallurgical recovery plant as a commercial service; it explains the mineralogical logic of preparation.
Required validation
- Mineralogical host of silver
- Associated Pb-Zn-Cu-Au minerals
- Feed and target PSD
- Balance between liberation and excessive fines
- Downstream gravity/flotation/leach testwork
