Which types of ores are purified by hydraulic washing ? Give two examples also.

Explanation

### Step-by-Step Solution:

1. **Understanding Hydraulic Washing**:
- Hydraulic washing is a method used to separate ore from impurities based on differences in density. It involves the use of water to wash away lighter impurities while leaving behind heavier ore particles.

2. **Types of Ores Purified by Hydraulic Washing**:
- The ores that are typically purified by hydraulic washing are mainly oxides and carbonates. This method is effective because these types of ores often have a higher density compared to the associated impurities.

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