Removal of the unwanted materials from the ore is known as

Options

A. concentration , dressing , benefaction
B. speration , refining , gangue
C. magnetic seperation, purification, gangue
D. washing, refining, amalgamation

Answer

To solve the question "Removal of the unwanted materials from the ore is known as," we can follow these steps:

### Step 1: Understand the Terminology
- The term "ore" refers to a naturally occurring solid material from which a metal or valuable mineral can be extracted profitably.
- "Unwanted materials" in the context of ores are referred to as "gangue," which are the materials that do not contain the desired metal or mineral.

### Step 2: Identify the Process
- The process of removing gangue from the ore is essential in metallurgy to increase the concentration of the desired metal. This process is commonly known by several terms.

### Step 3: Analyze the Options
- The options provided are:
1. Concentration, dressing, and benefaction
2. Magnetic separation, purification, gangue
3. Washing, refining, and amalgamation

### Step 4: Determine the Correct Answer
- The first option, "Concentration, dressing, and benefaction," refers to the processes that involve separating the valuable minerals from the gangue. This is the correct term for the removal of unwanted materials from the ore.

### Conclusion
- Therefore, the correct answer to the question is **"Concentration, dressing, and benefaction."**

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