The process of removing lighter gangue particles by washing in a current of water is called:

Options

A. levigation
B. liquation
C. leaching
D. cupellation

Explanation

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks about a specific process used to remove lighter gangue particles from ore by washing with water.

2. **Identifying Key Terms**: The terms "lighter gangue particles" and "washing in a current of water" are crucial. Gangue refers to the impurities present in the ore, and lighter particles are those that can be easily washed away.

3. **Recognizing the Process**: The process described involves the separation of lighter gangue from heavier ore particles. This is typically done using water to facilitate the separation.

4. **Naming the Process**: The process of removing lighter gangue particles by washing them away with water is known as **levigation**. This process can also be referred to as hydraulic washing or gravity separation, but the specific term for this method is levigation.

5. **Conclusion**: Therefore, the answer to the question is **levigation**.

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