What is the hydrometallurgy of silver or gold commonly known as ?

Explanation

### Step-by-Step Text Solution:

1. **Understanding Hydrometallurgy**:
- Hydrometallurgy is a method used for extracting metals from their ores through aqueous solutions. It involves the dissolution of metal salts in water, which allows for the recovery of the metal from the solution.

2. **Application to Silver and Gold**:
- In the case of silver and gold, the hydrometallurgical process involves extracting these metals from their ores by first preparing an aqueous solution of their salts. This process is particularly useful because it allows for the efficient recovery of the metals.

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