Why is thie that only sulphide ores are connectrated by forth floatation process ?

Explanation

### Step-by-Step Solution:

1. **Understanding Froth Flotation Process**: The froth flotation process is a method used to separate hydrophobic materials from hydrophilic ones. It is commonly used in the concentration of ores.

2. **Role of Pine Oil**: In this process, a collector agent is used, and pine oil is the collector agent that is typically employed for the concentration of sulphide ores.

3. **Wetting Properties**: Pine oil has the unique property of selectively wetting sulphide ores. This means that when pine oil is added to the mixture, it preferentially adheres to the surface of sulphide minerals.

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