Which of the following concentration processes will you use when the gangue is light ?

Options

A. Gravity separation
B. Froth Flotation
C. Magnetic Separation
D. Leaching

Answer

To solve the question regarding which concentration process to use when the gangue is light, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Question**: The question asks which concentration process is suitable when the gangue (the waste material) is light.

2. **Identify the Options**: The options provided are:
- A) Gravity separation
- B) Froth flotation
- C) Magnetic separation
- D) Leaching

3. **Analyze Each Option**:
- **Gravity Separation**: This method uses the difference in density between the ore and the gangue. It is effective when the gangue is lighter than the ore, as it allows the lighter gangue to be washed away with water.
- **Froth Flotation**: This process is used for ores that are hydrophobic (water-repelling) and is not specifically dependent on the weight of the gangue.
- **Magnetic Separation**: This method is used for separating magnetic materials from non-magnetic ones and is not directly related to the weight of the gangue.
- **Leaching**: This is a chemical process that involves dissolving the desired minerals from the ore and does not depend on the physical weight of the gangue.

4. **Determine the Best Option**: Since gravity separation is specifically designed to separate lighter gangue from heavier ore, it is the most appropriate method in this scenario.

5. **Conclusion**: The correct answer is **A) Gravity separation**.