Mine Development And Mining Methods - Study Mode
[#81] Which of the following methods is most suitable for soft, unconsolidated ground?
Correct Answer
(C) Cut and fill
Explanation
Solution: Cut and fill provides support after each cut with fill material.The correct answer is: Cut and fillIdeal for poor ground conditions.Allows selective mining and ground stability.
[#82] What is a boxhole in mining?
Correct Answer
(B) Small raise driven upward
Explanation
Solution: Boxhole is a small raise made upward to connect levels.The correct answer is: Small raise driven upwardCommonly used to initiate raises or ore passes.Usually drilled using handheld or mechanized equipment.
[#83] Which mining layout includes rooms and pillars of unmined ore?
Correct Answer
(B) Room and pillar
Explanation
Solution: Room and pillar leaves parts of the ore as pillars for support.The correct answer is: Room and pillarCommon in coal and flat-lying bedded deposits.Pillars may be later recovered in retreat mining.
[#84] Which drilling pattern is used in shaft sinking?
Correct Answer
(C) Burn cut
Explanation
Solution: Burn cut is commonly used in shaft sinking.The correct answer is: Burn cutCentral holes are left uncharged to create a void.Allows other holes to break into the void efficiently.
[#85] What is the primary purpose of a collar level in shaft development?
Correct Answer
(C) Provide horizontal access from shaft
Explanation
Solution: Collar level is the first horizontal opening from a vertical shaft.The correct answer is: Provide horizontal access from shaftActs as a hub for early excavation or logistics.Often used during sinking and construction stages.