Name the process for the benefaction/concentration of (i) an ore having lighter impurities, (ii) sulphide ore.

Answer

To answer the question regarding the processes for the benefaction/concentration of ores, we will break it down into two parts based on the types of ores mentioned.

### Step-by-Step Solution:

1. **Identify the type of ore with lighter impurities:**
- Ores that have lighter impurities can be concentrated using a method that separates based on density differences.

2. **Process for ores with lighter impurities:**
- The process used for the benefaction of ores with lighter impurities is **Gravitational Separation**. This method utilizes the difference in density between the ore and the impurities to separate them.

3. **Identify the type of sulphide ore:**
- Sulphide ores are generally concentrated using a method that takes advantage of their hydrophobic properties.

4. **Process for sulphide ore:**
- The process used for the concentration of sulphide ores is the **Froth Floatation Method**. In this method, a frothing agent is added to create a froth, which allows the sulphide minerals to attach to air bubbles and rise to the surface, separating them from the gangue.

### Final Answer:
- (i) For an ore having lighter impurities: **Gravitational Separation**
- (ii) For sulphide ore: **Froth Floatation Method**