Open-pit mining is the removal of mineral-bearing ore from what type of excavation?

Open-pit mining is the removal of mineral-bearing ore from what type of excavation?

• A. Small underground chamber
• B. Large surface excavation
• C. Riverbed deposits
• D. Coastal seabed

Answer: (B)

Open-pit mining involves removing ore from the surface, creating a large open pit. This method is used when the mineral deposit lies near the surface and can be accessed by excavating overburden and rock in a big, exposed crater, often with stepped benches as the pit deepens. It contrasts with underground mining, which relies on tunnels and chambers beneath the ground. So the description that fits best is a large surface excavation. The other options describe underground chambers, riverbed deposits, or seabed mining, which are not open-pit mining.

Open-pit mining involves removing ore from the surface, creating a large open pit. This method is used when the mineral deposit lies near the surface and can be accessed by excavating overburden and rock in a big, exposed crater, often with stepped benches as the pit deepens. It contrasts with underground mining, which relies on tunnels and chambers beneath the ground. So the description that fits best is a large surface excavation. The other options describe underground chambers, riverbed deposits, or seabed mining, which are not open-pit mining.