How many metallic ores are concentrated by magnetic separation method from the given ores ?
Cassiterite, pyrolusite, rutile,magnetite, galena, cinnabar.

Explanation

To determine how many metallic ores can be concentrated by the magnetic separation method from the given list, we will analyze each ore based on its magnetic properties.

### Step-by-Step Solution:

1. **Identify the Ores**: The ores provided in the question are:
- Cassiterite (SnO2)
- Pyrolusite (MnO2)
- Rutile (TiO2)
- Magnetite (Fe3O4)
- Galena (PbS)
- Cinnabar (HgS)

2. **Understand Magnetic Separation**: Magnetic separation is a process used to separate magnetic materials from non-magnetic ones. This method is effective when the ore has magnetic properties and the impurities are non-magnetic.

3. **Analyze Each Ore**:
- **Cassiterite (SnO2)**: This ore does not have significant magnetic properties. **(Not suitable)**
- **Pyrolusite (MnO2)**: This ore has magnetic properties. **(Suitable)**
- **Rutile (TiO2)**: This ore does not have significant magnetic properties. **(Not suitable)**
- **Magnetite (Fe3O4)**: This ore is magnetic. **(Suitable)**
- **Galena (PbS)**: This ore does not have magnetic properties. **(Not suitable)**
- **Cinnabar (HgS)**: This ore does not have magnetic properties. **(Not suitable)**

4. **Count the Suitable Ores**: From the analysis:
- Pyrolusite (1)
- Magnetite (2)

Total suitable ores = 2.

### Final Answer:
The total number of metallic ores that can be concentrated by the magnetic separation method from the given ores is **2**.