Fill in the blanks choosing appropriate word/ words from those given in the brackets : (gravity separation, magnetic separation, absence, presence, `CuFeS_2`, `Cu_2S`, froth flotation, aluminium, iron, smelting, pure, impure, mines, copper, silver, sulfide, zinc, chromium nickel, tin, blister copper, Cus, Fes, thermal, electrical, argentite or silver glance `(Ag_2S)`, cuprous oxide, cuprous sulfide.)
The removal of gangue from the ores is called ......

Explanation

To solve the question, we need to fill in the blank with the appropriate term that describes the process of removing gangue from ores.

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks for the term that describes the removal of gangue from ores. Gangue refers to the unwanted material that is separated from the ore during the extraction process.

2. **Identifying Relevant Terms**: From the options provided, we need to identify which term is commonly used in the context of ore processing. The relevant terms from the options include:
- ore dressing
...