Which of the following is a mining method discussed in class?092d8e9c168fcc762a3b8c84e6b16688.webm91 KB astrip mine bshaft mine copen-pit mine dall of these

To determine which of the listed mining methods was discussed in class, let’s analyze each option:

1. Astrip mine: This is a method where soil and rock overburden is removed to expose and extract mineral deposits, typically used for minerals located close to the surface.

2. Bshaft mine: This method involves digging a vertical shaft deep into the ground to reach ore deposits, which is commonly used for deep mineral deposits.

3. Copen-pit mine: Similar to strip mining, open-pit mining involves removing layers of earth to access minerals, but it usually covers a larger area and is employed for extracting minerals that are near the surface.

4. Dall of these: This option suggests that all the mentioned methods are indeed mining methods discussed in class.

Analysis: Each of the methods listed is a recognized mining technique, so the inclusion of all three options indicates that they were covered in class.

Final Answer

D) All of these is the correct choice, as all the listed methods (strip mine, shaft mine, open-pit mine) are valid mining techniques.