Amongst the following , the total number of ores which may be concentrated by froth floatation process is : haematite, bauxite, galena, copper pyrites, sphalerite, cassiterite, calamine, argentite , chalocite.

Explanation

To determine the total number of ores that can be concentrated by the froth flotation process from the given list, we need to identify which of these ores are sulfide ores, as the froth flotation process is primarily used for concentrating sulfide ores.

### Step-by-Step Solution:

1. **List the Given Ores:**
The ores provided in the question are:
- Haematite (Fe2O3)
- Bauxite (Al2O3·2H2O)
- Galena (PbS)
- Copper Pyrites (CuFeS2)
- Sphalerite (ZnS)
- Cassiterite (SnO2)
- Calamine (ZnCO3)
- Argentite (Ag2S)
- Chalcosite (Cu2S)

2. **Identify the Type of Each Ore:**
- **Haematite**: Oxide ore (Fe2O3)
- **Bauxite**: Hydroxide ore (Al2O3·2H2O)
- **Galena**: Sulfide ore (PbS)
- **Copper Pyrites**: Sulfide ore (CuFeS2)
- **Sphalerite**: Sulfide ore (ZnS)
- **Cassiterite**: Oxide ore (SnO2)
- **Calamine**: Carbonate ore (ZnCO3)
- **Argentite**: Sulfide ore (Ag2S)
- **Chalcosite**: Sulfide ore (Cu2S)

3. **Identify the Sulfide Ores:**
From the list, the sulfide ores are:
- Galena (PbS)
- Copper Pyrites (CuFeS2)
- Sphalerite (ZnS)
- Argentite (Ag2S)
- Chalcosite (Cu2S)

4. **Exclude Non-Sulfide Ores:**
The ores that cannot be concentrated by the froth flotation process are:
- Haematite
- Bauxite
- Cassiterite
- Calamine

5. **Count the Concentratable Ores:**
The sulfide ores that can be concentrated using the froth flotation process are:
- Galena
- Copper Pyrites
- Sphalerite
- Chalcosite

Note: Argentite is a sulfide ore but is typically concentrated using leaching due to the presence of silver.

6. **Final Count:**
Thus, the total number of ores that can be concentrated by the froth flotation process is **4** (Galena, Copper Pyrites, Sphalerite, and Chalcosite).

### Answer:
The total number of ores which may be concentrated by the froth flotation process is **4**.

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