Question

Choose the feature of 'open-cast mining' from the followings:

Options

• Cheapest way of mining.

• It requires lifts drills.

• It requires ventilation system.

• It has high labour cost.

Answer 1

Cheapest way of mining.

Explanation:

Open-cast mining is a surface mining technique where minerals are extracted by removing overlying layers of soil and rock. It is considered the cheapest way of mining due to its simplicity, minimal requirement for expensive equipment, and ease of operation compared to underground mining.