Give one example where hydrometallurgy is used for metal extraction?

Explanation

### Step-by-Step Solution

1. **Understanding Hydrometallurgy**:
- Hydrometallurgy is a method of extracting metals from their ores using aqueous solutions. It involves the use of water-based solutions to dissolve and recover metals.

2. **Identifying an Example**:
- One common example of hydrometallurgy is the leaching of copper oxide ores.

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